Android 学生信息管理系统

今天上课老师让利用ListView和数据库做一个学员信息管理系统。下面我就把自己做的代码复制下来，供大家参考。

首页的布局main.xml

xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <RelativeLayout android:id="@+id/RelativeLayout"
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content">
        <Button android:id="@+id/bn_search_id" 
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" 
            android:text="搜索"
            android:gravity="center_vertical" />
        <Button android:gravity="center" 
            android:text="@string/myButton"
            android:id="@+id/btn_add_student" 
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" 
            android:layout_alignParentTop="true"
            android:layout_toRightOf="@+id/bn_search_id" 
            android:layout_toLeftOf="@+id/bn_select" />
        <Button  android:gravity="center_vertical"
            android:text="选择" 
            android:id="@+id/bn_select" 
            android:layout_width="wrap_content"
            android:layout_height="wrap_content" 
            android:layout_alignParentTop="true"
            android:layout_alignParentRight="true">Button>
    RelativeLayout>
    <TextView 
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:text="              ID            姓 名       年 龄         性 别        "
    />
    <ListView android:id="@android:id/list"
    android:layout_width="fill_parent" 
    android:layout_weight="1"
    android:layout_height="wrap_content"/>
    <LinearLayout 
        android:orientation="horizontal"
        android:id="@+id/showLiner"
        android:visibility="gone"    
         android:layout_width="fill_parent"
         android:layout_height="wrap_content">
         <Button 
         android:id="@+id/bn_delete"
         android:layout_width="fill_parent"
         android:layout_height="wrap_content"
         android:layout_weight="1"
         android:text="删除"
         android:enabled="false"
         />     
         <Button 
         android:id="@+id/bn_selectall"
         android:layout_width="fill_parent"
         android:layout_height="wrap_content"
         android:layout_weight="1"
         android:text="全选"
         />
         <Button 
         android:id="@+id/bn_canel"
        android:layout_width="fill_parent"
         android:layout_height="wrap_content"
         android:layout_weight="1"
         android:text="取消"
         />   
         LinearLayout>
        
LinearLayout>

创建listView中显示学员信息的xml格式student_list_item.xml

"1.0" encoding= "utf-8" ?>
"http://schemas.android.com/apk/res/android"
android:orientation= "horizontal"
android:layout_width= "fill_parent"
android:layout_height= "wrap_content" >
"fill_parent"
android:layout_height= "wrap_content"
android:layout_gravity= "center"
android:layout_weight= "1"
android:background= "@drawable/icon" />
"@+id/tv_stu_id"
android:layout_width= "fill_parent"
android:layout_gravity= "center"
android:layout_height= "wrap_content"
android:layout_weight= "1" />
"@+id/tv_stu_name"
android:layout_width= "fill_parent"
android:layout_gravity= "center"
android:layout_height= "wrap_content"
android:layout_weight= "1" />

"@+id/tv_stu_age"
android:layout_width= "fill_parent"
android:layout_gravity= "center"
android:layout_height= "wrap_content"
android:layout_weight= "1" />
"@+id/tv_stu_sex"
android:layout_width= "fill_parent"
android:layout_gravity= "center"
android:layout_height= "wrap_content"
android:layout_weight= "1" />

"@+id/tv_stu_likes"
android:layout_width= "fill_parent"
android:layout_gravity= "center"
android:layout_height= "wrap_content"
android:layout_weight= "1"
android:visibility= "gone" />
"@+id/tv_stu_phone"
android:layout_width= "fill_parent"
android:layout_gravity= "center"
android:layout_height= "wrap_content"
android:layout_weight= "1"
android:visibility= "gone" />
"@+id/tv_stu_traindate"
android:layout_width= "fill_parent"
android:layout_height= "wrap_content"
android:layout_gravity= "center"
android:layout_weight= "1"
android:visibility= "gone" />
"@+id/tv_stu_modifyDateTime"
android:layout_width= "fill_parent"
android:layout_gravity= "center"
android:layout_height= "wrap_content"
android:layout_weight= "1"
android:visibility= "gone" />


android:id= "@+id/cb_box"
android:layout_width= "fill_parent"
android:layout_height= "wrap_content"
android:layout_weight= "1"
android:visibility= "gone"
android:checked= "false"
android:focusable= "false"
/>

　　创建一个StudentListActivity做为主页显示学员信息以及进行一些操作。

package cn.yj3g.student.activity;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import android.app.AlertDialog;
import android.app.ListActivity;
import android.content.DialogInterface;
import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.util.Log;
import android.view.ContextMenu;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.AdapterView.OnItemLongClickListener;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.RelativeLayout;
import android.widget.SimpleCursorAdapter;
import android.widget.Toast;
import cn.yj3g.student.dao.StudentDao;
import cn.yj3g.student.db.StudentDBHelper;
import cn.yj3g.student.entry.Student;
import cn.yj3g.student.entry.TableContanst;

public class StudentListActivity extends ListActivity implements
        OnClickListener, OnItemClickListener, OnItemLongClickListener {

    private static final String TAG = "TestSQLite";
    private Button addStudent;
    private Cursor cursor;
    private SimpleCursorAdapter adapter;
    private ListView listView;
    private List<Long> list;
    private RelativeLayout relativeLayout;
    private Button searchButton;
    private Button selectButton;
    private Button deleteButton;
    private Button selectAllButton;
    private Button canleButton;
    private LinearLayout layout;
    private StudentDao dao;
    private Student student;
    private Boolean isDeleteList = false;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        Log.e(TAG, "onCreate");
        list = new ArrayList<Long>();
        student = new Student();
        dao = new StudentDao(new StudentDBHelper(this));
        addStudent = (Button) findViewById(R.id.btn_add_student);
        searchButton = (Button) findViewById(R.id.bn_search_id);
        selectButton = (Button) findViewById(R.id.bn_select);
        deleteButton = (Button) findViewById(R.id.bn_delete);
        selectAllButton = (Button) findViewById(R.id.bn_selectall);
        canleButton = (Button) findViewById(R.id.bn_canel);
        layout = (LinearLayout) findViewById(R.id.showLiner);
        relativeLayout=(RelativeLayout) findViewById(R.id.RelativeLayout);
        listView = getListView();

        // 为按键设置监听
        addStudent.setOnClickListener(this);
        searchButton.setOnClickListener(this);
        selectButton.setOnClickListener(this);
        deleteButton.setOnClickListener(this);
        canleButton.setOnClickListener(this);
        selectAllButton.setOnClickListener(this);
        listView.setOnItemClickListener(this);
        listView.setOnItemLongClickListener(this);
        listView.setOnCreateContextMenuListener(this);

    }

    @Override
    protected void onStart() {
        // 调用load()方法将数据库中的所有记录显示在当前页面
        super.onStart();
        load();

    }

    public void onClick(View v) {
        // 跳转到添加信息的界面
        if (v == addStudent) {
            startActivity(new Intent(this, AddStudentActivity.class));
        } else if (v == searchButton) {
            // 跳转到查询界面
            startActivity(new Intent(this, StudentSearch.class));
        } else if (v == selectButton) {
            // 跳转到选择界面
            isDeleteList = !isDeleteList;
            if (isDeleteList) {
                checkOrClearAllCheckboxs(true);
            } else {
                showOrHiddenCheckBoxs(false);
            }
        } else if (v == deleteButton) {
            // 删除数据
            if (list.size() > 0) {
                for (int i = 0; i < list.size(); i++) {
                    long id = list.get(i);
                    Log.e(TAG, "delete id=" + id);
                    int count = dao.deleteStudentById(id);
                }
                dao.closeDB();
                load();
            }
        } else if (v == canleButton) {
            // 点击取消，回到初始界面
            load();
            layout.setVisibility(View.GONE);
            isDeleteList = !isDeleteList;
        } else if (v == selectAllButton) {
            // 全选，如果当前全选按钮显示是全选，则在点击后变为取消全选，如果当前为取消全选，则在点击后变为全选
            selectAllMethods();
        }
    }
    // 创建菜单
    @Override
    public void onCreateContextMenu(ContextMenu menu, View v,
            ContextMenuInfo menuInfo) {
        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.layout.menu, menu);
    }

    // 对菜单中的按钮添加响应时间
    @Override
    public boolean onContextItemSelected(MenuItem item) {
        int item_id = item.getItemId();
        student = (Student) listView.getTag();
        Log.v(TAG, "TestSQLite++++student+" + listView.getTag() + "");
        final long student_id = student.getId();
        Intent intent = new Intent();
        // Log.v(TAG, "TestSQLite+++++++id"+student_id);
        switch (item_id) {
        // 添加
        case R.id.add:
            startActivity(new Intent(this, AddStudentActivity.class));
            break;
        // 删除
        case R.id.delete:
            deleteStudentInformation(student_id);
            break;
        case R.id.look:
            // 查看学生信息
            // Log.v(TAG, "TestSQLite+++++++look"+student+"");
            intent.putExtra("student", student);
            intent.setClass(this, ShowStudentActivity.class);
            this.startActivity(intent);
            break;
        case R.id.write:
            // 修改学生信息
            intent.putExtra("student", student);
            intent.setClass(this, AddStudentActivity.class);
            this.startActivity(intent);
            break;
        default:
            break;
        }
        return super.onContextItemSelected(item);
    }

    // 创建一个按钮菜单
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        menu.add(1, 1, 1, "按入学日期排序");
        menu.add(1, 2, 1, "按姓名进行排序");
        menu.add(1, 5, 1, "按学号进行排序");
        menu.add(1, 3, 1, "模糊查找");
        menu.add(1, 4, 1, "退出");
        return super.onCreateOptionsMenu(menu);
    }

    // 对菜单中的按钮添加响应时间
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        int id = item.getItemId();
        switch (id) {
        // 排序
        case 1:
            cursor = dao.sortByTrainDate();
            load(cursor);
            break;

        // 排序
        case 2:
            cursor = dao.sortByName();
            load(cursor);
            break;
        // 查找
        case 3:
            startActivity(new Intent(this, StudentSearch.class));
            break;
        // 退出
        case 4:
            finish();
            break;
        case 5:
            cursor = dao.sortByID();
            load(cursor);
            break;
        default:
            break;
        }
        return super.onOptionsItemSelected(item);
    }

    // 长点击一条记录触发的时间
    @Override
    public boolean onItemLongClick(AdapterView parent, View view,
            int position, long id) {
        Student student = (Student) dao.getStudentFromView(view, id);
        listView.setTag(student);
        return false;
    }

    // 点击一条记录是触发的事件
    @Override
    public void onItemClick(AdapterView parent, View view, int position,
            long id) {
        if (!isDeleteList) {
            student = dao.getStudentFromView(view, id);
            // Log.e(TAG, "student*****" + dao.getStudentFromView(view, id));
            Intent intent = new Intent();
            intent.putExtra("student", student);
            intent.setClass(this, ShowStudentActivity.class);
            this.startActivity(intent);
        } else {
            CheckBox box = (CheckBox) view.findViewById(R.id.cb_box);
            box.setChecked(!box.isChecked());
            list.add(id);
            deleteButton.setEnabled(box.isChecked());
        }
    }

    // 自定义一个加载数据库中的全部记录到当前页面的无参方法
    public void load() {
        StudentDBHelper studentDBHelper = new StudentDBHelper(
                StudentListActivity.this);
        SQLiteDatabase database = studentDBHelper.getWritableDatabase();
        cursor = database.query(TableContanst.STUDENT_TABLE, null, null, null,
                null, null, TableContanst.StudentColumns.MODIFY_TIME + " desc");
        startManagingCursor(cursor);
        adapter = new SimpleCursorAdapter(this, R.layout.student_list_item,
                cursor, new String[] { TableContanst.StudentColumns.ID,
                        TableContanst.StudentColumns.NAME,
                        TableContanst.StudentColumns.AGE,
                        TableContanst.StudentColumns.SEX,
                        TableContanst.StudentColumns.LIKES,
                        TableContanst.StudentColumns.PHONE_NUMBER,
                        TableContanst.StudentColumns.TRAIN_DATE }, new int[] {
                        R.id.tv_stu_id, R.id.tv_stu_name, R.id.tv_stu_age,
                        R.id.tv_stu_sex, R.id.tv_stu_likes, R.id.tv_stu_phone,
                        R.id.tv_stu_traindate });
        listView.setAdapter(adapter);
    }

    // 自定义一个加载数据库中的全部记录到当前页面的有参方法
    public void load(Cursor cursor) {
        adapter = new SimpleCursorAdapter(this, R.layout.student_list_item,
                cursor, new String[] { TableContanst.StudentColumns.ID,
                        TableContanst.StudentColumns.NAME,
                        TableContanst.StudentColumns.AGE,
                        TableContanst.StudentColumns.SEX,
                        TableContanst.StudentColumns.LIKES,
                        TableContanst.StudentColumns.PHONE_NUMBER,
                        TableContanst.StudentColumns.TRAIN_DATE }, new int[] {
                        R.id.tv_stu_id, R.id.tv_stu_name, R.id.tv_stu_age,
                        R.id.tv_stu_sex, R.id.tv_stu_likes, R.id.tv_stu_phone,
                        R.id.tv_stu_traindate });
        listView.setAdapter(adapter);
    }

    // 全选或者取消全选
    private void checkOrClearAllCheckboxs(boolean b) {
        int childCount = listView.getChildCount();
        // Log.e(TAG, "list child size=" + childCount);
        for (int i = 0; i < childCount; i++) {
            View view = listView.getChildAt(i);
            if (view != null) {
                CheckBox box = (CheckBox) view.findViewById(R.id.cb_box);
                box.setChecked(!b);
            }
        }
        showOrHiddenCheckBoxs(true);
    }

    // 显示或者隐藏自定义菜单
    private void showOrHiddenCheckBoxs(boolean b) {
        int childCount = listView.getChildCount();
        // Log.e(TAG, "list child size=" + childCount);
        for (int i = 0; i < childCount; i++) {
            View view = listView.getChildAt(i);
            if (view != null) {
                CheckBox box = (CheckBox) view.findViewById(R.id.cb_box);
                int visible = b ? View.VISIBLE : View.GONE;
                box.setVisibility(visible);
                layout.setVisibility(visible);
                deleteButton.setEnabled(false);
            }
        }
    }

    // 自定义一个利用对话框形式进行数据的删除

    private void deleteStudentInformation(final long delete_id) {
        // 利用对话框的形式删除数据
        AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle("学员信息删除")
                .setMessage("确定删除所选记录?")
                .setCancelable(false)
                .setPositiveButton("确定", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int id) {
                        int raws = dao.deleteStudentById(delete_id);
                        layout.setVisibility(View.GONE);
                        isDeleteList = !isDeleteList;
                        load();
                        if (raws > 0) {
                            Toast.makeText(StudentListActivity.this, "删除成功!",
                                    Toast.LENGTH_LONG).show();
                        } else
                            Toast.makeText(StudentListActivity.this, "删除失败!",
                                    Toast.LENGTH_LONG).show();
                    }
                })
                .setNegativeButton("取消", new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int id) {
                        dialog.cancel();
                    }
                });
        AlertDialog alert = builder.create();
        alert.show();
    }

    // 点击全选事件时所触发的响应
    private void selectAllMethods() {
        // 全选，如果当前全选按钮显示是全选，则在点击后变为取消全选，如果当前为取消全选，则在点击后变为全选
        if (selectAllButton.getText().toString().equals("全选")) {
            int childCount = listView.getChildCount();
            for (int i = 0; i < childCount; i++) {
                View view = listView.getChildAt(i);
                if (view != null) {
                    CheckBox box = (CheckBox) view.findViewById(R.id.cb_box);
                    box.setChecked(true);
                    deleteButton.setEnabled(true);
                    selectAllButton.setText("取消全选");
                }
            }
        } else if (selectAllButton.getText().toString().equals("取消全选")) {
            checkOrClearAllCheckboxs(true);
            deleteButton.setEnabled(false);
            selectAllButton.setText("全选");
        }
    }
}

menu.xml文件

1. <menu xmlns:android="http://schemas.android.com/apk/res/android">
3. <group android:checkableBehavior="single">
4. <item android:id="@+id/delete" android:title="删除学员信息" />
5. <item android:id="@+id/look" android:title="详细信息" />
6. <item android:id="@+id/add" android:title="添加学员信息" />
7. <item android:id="@+id/write" android:title="修改学员信息" />
8. group>
9. menu>

界面效果图如下：

删除界面：

在点击ListView中的一条Item时，老师要求显示出这个学生的详细信息，所以需要一个xml文件来显示这个信息。在这里我创建了一个student_info.xml文件

  1 xml version="1.0" encoding="utf-8"?>
  2 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  3     android:orientation="vertical"
  4     android:layout_width="fill_parent"
  5     android:layout_height="fill_parent"
  6     android:padding="5dip"
  7     >
  8     <TextView android:id="@+id/id2_text_id"
  9         android:layout_width="80dip"
 10         android:layout_height="40dip"
 11         android:layout_marginRight="5dip"
 12         android:layout_marginTop="5dip"
 13         android:layout_marginBottom="5dip"
 14         android:textSize="16sp"
 15         android:gravity="left|center_vertical"
 16         android:text="学员ID："
 17     />
 18     
 19     <TextView android:id="@+id/tv_info_id"
 20         android:layout_width="fill_parent"
 21         android:layout_height="40dip"
 22         android:layout_toRightOf="@id/id2_text_id"
 23         android:layout_alignParentRight="true"
 24         android:layout_alignTop="@id/id2_text_id"
 25         android:gravity="left|center_vertical"
 26     />
 27     
 28     <TextView android:id="@+id/name2_text_id"
 29         android:layout_width="80dip"
 30         android:layout_height="40dip"
 31         android:layout_marginRight="5dip"
 32         android:layout_marginTop="5dip"
 33         android:layout_marginBottom="5dip"
 34         android:layout_below="@id/id2_text_id"
 35         android:layout_alignLeft="@id/id2_text_id"
 36         android:textSize="16sp"
 37         android:gravity="left|center_vertical"
 38         android:text="姓名："
 39     />
 40     
 41     <TextView android:id="@+id/tv_info_name"
 42         android:layout_width="fill_parent"
 43         android:layout_height="40dip"
 44         android:layout_toRightOf="@id/name2_text_id"
 45         android:layout_alignParentRight="true"
 46         android:layout_alignTop="@id/name2_text_id"
 47         android:gravity="left|center_vertical"
 48     />
 49     
 50     <TextView android:id="@+id/age2_text_id"
 51         android:layout_width="80dip"
 52         android:layout_height="40dip"
 53         android:gravity="left|center_vertical"
 54         android:layout_marginRight="5dip"
 55         android:layout_below="@id/name2_text_id"
 56         android:layout_marginBottom="5dip"
 57         android:textSize="16sp"
 58         android:text="年龄："
 59     />
 60     
 61     <TextView android:id="@+id/tv_info_age"
 62         android:layout_width="fill_parent"
 63         android:layout_height="40dip"
 64         android:layout_toRightOf="@id/age2_text_id"
 65         android:layout_alignParentRight="true"
 66         android:layout_alignTop="@id/age2_text_id"
 67         android:gravity="left|center_vertical"
 68     />
 69     
 70     <TextView android:id="@+id/sex2_text_id"
 71         android:layout_width="80dip"
 72         android:layout_height="40dip"
 73         android:gravity="left|center_vertical"
 74         android:layout_below="@id/age2_text_id"
 75         android:layout_alignLeft="@id/age2_text_id"
 76         android:layout_marginRight="5dip"
 77         android:layout_marginBottom="5dip"
 78         android:text="性别："
 79         android:textSize="16sp"
 80     />
 81     
 82     <TextView
 83         android:id="@+id/tv_info_sex"
 84         android:layout_width="fill_parent"
 85         android:layout_height="40dip"
 86         android:layout_toRightOf="@id/sex2_text_id"
 87         android:layout_alignParentRight="true"
 88         android:layout_alignTop="@id/sex2_text_id"
 89         android:gravity="left|center_vertical"
 90         />
 91     
 92     <TextView  android:id="@+id/like2_text_id"
 93         android:layout_width="80dip"
 94         android:layout_height="40dip"
 95         android:gravity="left|center_vertical"
 96         android:layout_below="@id/sex2_text_id"
 97         android:layout_alignLeft="@id/sex2_text_id"
 98         android:layout_marginRight="5dip"
 99         android:layout_marginBottom="5dip"
100         android:text="爱好："
101         android:textSize="16sp"
102     />
103     <TextView android:layout_height="40dip" 
104         android:id="@+id/tv_info_likes" 
105         android:layout_width="wrap_content" 
106         android:layout_toRightOf="@id/like2_text_id"
107         android:layout_below="@id/sex2_text_id"
108         android:layout_marginRight="52dip"
109         android:gravity="left|center_vertical"/>
110 
111     <TextView android:id="@+id/contact2_text_id"
112         android:layout_width="80dip"
113         android:layout_height="40dip"
114         android:gravity="center_vertical|left"
115         android:layout_marginRight="5dip"
116         android:layout_below="@id/like2_text_id"
117         android:layout_marginBottom="5dip"
118         android:textSize="16sp"
119         android:text="联系电话："
120     />
121     
122     <TextView android:id="@+id/tv_info_phone"
123         android:layout_width="fill_parent"
124         android:layout_height="40dip"
125         android:layout_toRightOf="@id/contact2_text_id"
126         android:layout_alignParentRight="true"
127         android:layout_alignTop="@id/contact2_text_id"
128         android:gravity="center_vertical|left"
129     />
130     
131     <TextView android:id="@+id/train2_time_text_id"
132         android:layout_width="80dip"
133         android:layout_height="40dip"
134         android:gravity="center_vertical|left"
135         android:layout_marginRight="5dip"
136         android:layout_below="@id/contact2_text_id"
137         android:layout_marginBottom="5dip"
138         android:textSize="16sp"
139         android:text="入学日期"
140     />
141     
142     <TextView android:id="@+id/tv_info_train_date"
143         android:layout_width="fill_parent"
144         android:layout_height="40dip"
145         android:layout_toRightOf="@id/train2_time_text_id"
146         android:layout_alignParentRight="true"
147         android:layout_alignTop="@id/train2_time_text_id"
148         android:gravity="center_vertical|left"
149     />
150     
151     <Button android:id="@+id/back_to_list_id" 
152         android:layout_width="fill_parent" 
153         android:layout_height="wrap_content" 
154         android:text="返回列表界面" 
155         android:layout_below="@id/train2_time_text_id" 
156         android:layout_alignParentLeft="true"
157         android:layout_alignParentRight="true"
158         android:onClick="goBack">
159     Button>
160 RelativeLayout>

当然我们需要一个Activity来显示这些信息，在这里我创建了一个ShowStudentActivity。

1. package cn.yj3g.student.activity;
3. import android.app.Activity;
4. import android.content.Intent;
5. import android.os.Bundle;
6. import android.view.View;
7. import android.widget.TextView;
8. import cn.yj3g.student.entry.Student;
9. import cn.yj3g.student.entry.TableContanst;
11. public class ShowStudentActivity extends Activity {
13. @Override
14. public void onCreate(Bundle savedInstanceState) {
15. super.onCreate(savedInstanceState);
16. setContentView(R.layout.student_info);
17. Intent intent = getIntent();
18. Student student = (Student) intent.getSerializableExtra(TableContanst.STUDENT_TABLE);
19. ((TextView)findViewById(R.id.tv_info_id)).setText(student.getId()+"");
20. ((TextView)findViewById(R.id.tv_info_name)).setText(student.getName());
21. ((TextView)findViewById(R.id.tv_info_age)).setText(student.getAge()+"");
22. ((TextView)findViewById(R.id.tv_info_sex)).setText(student.getSex());
23. ((TextView)findViewById(R.id.tv_info_likes)).setText(student.getLike());
24. ((TextView)findViewById(R.id.tv_info_train_date)).setText(student.getTrainDate());
25. ((TextView)findViewById(R.id.tv_info_phone)).setText(student.getPhoneNumber());
26. }
28. public void goBack(View view) {
29. finish();
30. }
31. }

界面效果如下：

最最重要的环节来了，我们做这个系统主要是为了管理学员，所以增加和修改学员信息是必不可少的，因此需要一个Activity来专门提供添加和修改学员信息。在这里还有一件重要的事情要做，那就是要设计添加和修改学员的界面，在这里可用用相对布局做比较简单。我在这里创建了一个AddStudentActivity来添加和修改学员信息，下面附上相关代码：

add_student.xml

  1 xml version="1.0" encoding="utf-8"?>
  2 
  3 <ScrollView xmlns:android="http://schemas.android.com/apk/res/android"  
  4     android:layout_width="fill_parent"  
  5     android:layout_height="fill_parent"  
  6     android:fillViewport="true"  
  7     android:scrollbarStyle="outsideInset" > 
  8 <RelativeLayout 
  9     android:orientation="vertical"
 10     android:layout_width="fill_parent"
 11     android:layout_height="fill_parent"
 12     android:padding="5dip"
 13     >
 14     
 15     <TextView android:id="@+id/tv_stu_text_id"
 16         android:layout_width="80dip"
 17         android:layout_height="40dip"
 18         android:gravity="center_vertical|right"
 19         android:layout_marginRight="5dip"
 20         android:layout_marginTop="5dip"
 21         android:layout_marginBottom="5dip"
 22         android:textSize="16sp"
 23         android:text="学员ID："
 24     />
 25     
 26     <TextView android:id="@+id/tv_stu_id"
 27         android:layout_width="fill_parent"
 28         android:layout_height="40dip"
 29         android:text="未分配ID"
 30         android:layout_toRightOf="@id/tv_stu_text_id"
 31         android:layout_alignParentRight="true"
 32         android:layout_alignTop="@id/tv_stu_text_id"
 33         android:gravity="center"
 34         android:background="#ffffff"
 35         android:textColor="#000000"
 36         android:textSize="16sp"
 37     />
 38     
 39     <TextView android:id="@+id/tv_name_text"
 40         android:layout_width="80dip"
 41         android:layout_height="40dip"
 42         android:gravity="center_vertical|right"
 43         android:layout_marginRight="5dip"
 44         android:layout_below="@id/tv_stu_text_id"
 45         android:layout_alignLeft="@id/tv_stu_text_id"
 46         android:layout_marginBottom="5dip"
 47         android:textSize="16sp"
 48         android:text="姓名："
 49     />
 50     
 51     <EditText android:id="@+id/et_name"
 52         android:layout_width="fill_parent"
 53         android:layout_height="40dip"
 54         android:layout_toRightOf="@id/tv_name_text"
 55         android:layout_alignParentRight="true"
 56         android:layout_alignTop="@id/tv_name_text"
 57         android:hint="请输入姓名"
 58         android:inputType="textPersonName"
 59         android:paddingLeft="20dip"/>
 60     
 61     <TextView android:id="@+id/tv_age_text"
 62         android:layout_width="80dip"
 63         android:layout_height="40dip"
 64         android:gravity="center_vertical|right"
 65         android:layout_marginRight="5dip"
 66         android:layout_below="@id/tv_name_text"
 67         android:layout_marginBottom="5dip"
 68         android:textSize="16sp"
 69         android:text="年龄："
 70     />
 71     
 72     <EditText android:id="@+id/et_age"
 73         android:layout_width="fill_parent"
 74         android:layout_height="40dip"
 75         android:layout_toRightOf="@id/tv_age_text"
 76         android:layout_alignParentRight="true"
 77         android:layout_alignTop="@id/tv_age_text"
 78         android:hint="请输入年龄"
 79         android:paddingLeft="20dip"
 80         android:maxLength="3"
 81         android:inputType="number"
 82     />
 83     
 84     <TextView android:id="@+id/tv_sex_text"
 85         android:layout_width="80dip"
 86         android:layout_height="40dip"
 87         android:gravity="center_vertical|right"
 88         android:layout_below="@id/tv_age_text"
 89         android:layout_alignLeft="@id/tv_age_text"
 90         android:layout_marginRight="5dip"
 91         android:layout_marginBottom="5dip"
 92         android:text="性别："
 93         android:textSize="16sp"
 94     />
 95     
 96     <RadioGroup
 97         android:id="@+id/rg_sex"
 98         android:layout_width="fill_parent"
 99         android:layout_height="40dip"
100         android:orientation="horizontal"
101         android:layout_toRightOf="@id/tv_sex_text"
102         android:layout_alignParentRight="true"
103         android:layout_alignTop="@id/tv_sex_text"
104         >
105         <RadioButton
106           android:id="@+id/rb_sex_male"
107           android:layout_width="wrap_content"
108           android:layout_height="wrap_content"
109           android:layout_weight="1"
110           android:text="男"
111           android:textSize="16sp"
112         />
113         <RadioButton android:layout_width="wrap_content" 
114         android:layout_height="wrap_content" 
115         android:text="女" 
116         android:id="@+id/rb_sex_female"
117         android:layout_weight="1"
118         android:textSize="16sp">
119         RadioButton>
120     RadioGroup>
121     
122     <TextView  android:id="@+id/tv_likes_text"
123         android:layout_width="80dip"
124         android:layout_height="40dip"
125         android:gravity="center_vertical|right"
126         android:layout_below="@id/rg_sex"
127         android:layout_alignLeft="@id/tv_sex_text"
128         android:layout_marginRight="5dip"
129         android:layout_marginBottom="5dip"
130         android:text="爱好："
131         android:textSize="16sp"
132     />
133     <CheckBox
134     android:id="@+id/box1"
135             android:layout_width="wrap_content" android:layout_height="wrap_content"
136             android:layout_toRightOf="@id/tv_likes_text"
137             android:layout_below="@+id/rg_sex"
138             android:layout_alignLeft="@+id/group1"
139             android:text="@string/box1"
140     >CheckBox>
141     <CheckBox
142     android:id="@+id/box2"
143             android:layout_width="wrap_content" android:layout_height="wrap_content"
144             android:layout_toRightOf="@+id/box1"
145             android:layout_below="@+id/rg_sex"
146             android:layout_alignTop="@+id/box1"
147             android:text="@string/box2"
148     >CheckBox>
149     <CheckBox
150     android:id="@+id/box3"
151             android:layout_width="wrap_content" android:layout_height="wrap_content"
152             android:layout_toRightOf="@+id/box2"
153             android:layout_below="@+id/rg_sex"
154             android:layout_alignTop="@+id/box2"
155             android:text="@string/box3"
156     >CheckBox>
157     
158     <TextView android:id="@+id/tv_phone_text"
159         android:layout_width="80dip"
160         android:layout_height="40dip"
161         android:gravity="center_vertical|right"
162         android:layout_marginRight="5dip"
163         android:layout_below="@id/tv_likes_text"
164         android:layout_marginBottom="5dip"
165         android:textSize="16sp"
166         android:text="联系电话："
167     />
168     
169     <EditText android:id="@+id/et_phone"
170         android:layout_width="fill_parent"
171         android:layout_height="40dip"
172         android:layout_toRightOf="@id/tv_phone_text"
173         android:layout_alignParentRight="true"
174         android:layout_alignTop="@id/tv_phone_text"
175         android:hint="请输入手机号"
176         android:paddingLeft="20dip"
177         android:inputType="phone"
178         android:maxLength="11"
179     />
180     
181     <TextView android:id="@+id/tv_traindate_text"
182         android:layout_width="80dip"
183         android:layout_height="40dip"
184         android:gravity="center_vertical|right"
185         android:layout_marginRight="5dip"
186         android:layout_below="@id/tv_phone_text"
187         android:layout_marginBottom="5dip"
188         android:textSize="16sp"
189         android:text="入学日期"
190         
191     />
192     
193     <EditText android:id="@+id/et_traindate"
194         android:layout_width="fill_parent"
195         android:layout_height="40dip"
196         android:layout_toRightOf="@id/tv_traindate_text"
197         android:layout_alignParentRight="true"
198         android:layout_alignTop="@id/tv_traindate_text"
199         android:hint="点击选择日期"
200         android:inputType="date"
201         android:paddingLeft="20dip"
202         android:focusable="false"
203     />
204     <Button android:id="@+id/btn_save" 
205         android:layout_width="wrap_content" 
206         android:layout_height="wrap_content" 
207         android:text="保存" 
208         android:layout_below="@id/tv_traindate_text" 
209         android:layout_alignRight="@id/rg_sex">
210     Button>
211     <Button android:id="@+id/btn_clear" 
212         android:layout_width="wrap_content" 
213         android:layout_height="wrap_content" 
214         android:text="重置" 
215         android:layout_below="@id/tv_traindate_text" 
216         android:layout_toLeftOf="@id/btn_save"
217         android:layout_marginRight="10dip">
218     Button>
219 RelativeLayout>
220 ScrollView>

AddStudentActivity代码：

1. package cn.yj3g.student.activity;
3. import java.io.Serializable;
4. import java.text.SimpleDateFormat;
5. import java.util.Calendar;
6. import java.util.Date;
7. import java.util.HashSet;
9. import android.app.Activity;
10. import android.app.DatePickerDialog;
11. import android.app.Dialog;
12. import android.content.ContentValues;
13. import android.content.Intent;
14. import android.database.sqlite.SQLiteDatabase;
15. import android.os.Bundle;
16. import android.view.View;
17. import android.view.View.OnClickListener;
18. import android.widget.Button;
19. import android.widget.CheckBox;
20. import android.widget.CompoundButton;
21. import android.widget.CompoundButton.OnCheckedChangeListener;
22. import android.widget.DatePicker;
23. import android.widget.EditText;
24. import android.widget.RadioButton;
25. import android.widget.RadioGroup;
26. import android.widget.TextView;
27. import android.widget.Toast;
28. import cn.yj3g.student.dao.StudentDao;
29. import cn.yj3g.student.db.StudentDBHelper;
30. import cn.yj3g.student.entry.Student;
31. import cn.yj3g.student.entry.TableContanst;
33. public class AddStudentActivity extends Activity implements OnClickListener {
35. private static final String TAG = "AddStudentActivity";
36. private final static int DATE_DIALOG = 1;
37. private static final int DATE_PICKER_ID = 1;
38. private TextView idText;
39. private EditText nameText;
40. private EditText ageText;
41. private EditText phoneText;
42. private EditText dataText;
43. private RadioGroup group;
44. private RadioButton button1;
45. private RadioButton button2;
46. private CheckBox box1;
47. private CheckBox box2;
48. private CheckBox box3;
49. private Button restoreButton;
50. private String sex;
51. private Button resetButton;
52. private Long student_id;
54. private StudentDao dao;
55. private boolean isAdd = true;
57. @Override
58. public void onCreate(Bundle savedInstanceState) {
59. super.onCreate(savedInstanceState);
60. setContentView(R.layout.add_student);
61. idText = (TextView) findViewById(R.id.tv_stu_id);
62. nameText = (EditText) findViewById(R.id.et_name);
63. ageText = (EditText) findViewById(R.id.et_age);
64. button1 = (RadioButton) findViewById(R.id.rb_sex_female);
65. button2 = (RadioButton) findViewById(R.id.rb_sex_male);
66. phoneText = (EditText) findViewById(R.id.et_phone);
67. dataText = (EditText) findViewById(R.id.et_traindate);
68. group = (RadioGroup) findViewById(R.id.rg_sex);
69. box1 = (CheckBox) findViewById(R.id.box1);
70. box2 = (CheckBox) findViewById(R.id.box2);
71. box3 = (CheckBox) findViewById(R.id.box3);
73. restoreButton = (Button) findViewById(R.id.btn_save);
74. resetButton = (Button) findViewById(R.id.btn_clear);
75. dao = new StudentDao(new StudentDBHelper(this));
77. // 设置监听
78. restoreButton.setOnClickListener(this);
79. resetButton.setOnClickListener(this);
80. dataText.setOnClickListener(this);
81. checkIsAddStudent();
82. }
84. /**
85. * 检查此时Activity是否用于添加学员信息
86. */
87. private void checkIsAddStudent() {
88. Intent intent = getIntent();
89. Serializable serial = intent
90. .getSerializableExtra(TableContanst.STUDENT_TABLE);
91. if (serial == null) {
92. isAdd = true;
93. dataText.setText(getCurrentDate());
94. } else {
95. isAdd = false;
96. Student s = (Student) serial;
97. showEditUI(s);
99. }
100. }
102. /**
103. * 显示学员信息更新的UI
104. */
105. private void showEditUI(Student student) {
106. // 先将Student携带的数据还原到student的每一个属性中去
107. student_id = student.getId();
108. String name = student.getName();
109. int age = student.getAge();
110. String phone = student.getPhoneNumber();
111. String data = student.getTrainDate();
112. String like = student.getLike();
113. String sex = student.getSex();
114. if (sex.toString().equals("男")) {
115. button2.setChecked(true);
116. } else if (sex.toString().equals("女")) {
117. button1.setChecked(true);
118. }
119. if (like != null && !"".equals(like)) {
120. if (box1.getText().toString().indexOf(like) >= 0) {
121. box1.setChecked(true);
122. }
123. if (box2.getText().toString().indexOf(like) >= 0) {
124. box2.setChecked(true);
125. }
126. if (box3.getText().toString().indexOf(like) >= 0) {
127. box3.setChecked(true);
128. }
129. }
130. // 还原数据
131. idText.setText(student_id + "");
132. nameText.setText(name + "");
133. ageText.setText(age + "");
134. phoneText.setText(phone + "");
135. dataText.setText(data + "");
136. setTitle("学员信息更新");
137. restoreButton.setText("更新");
138. }
140. public void onClick(View v) {
141. // 收集数据
142. if (v == restoreButton) {
143. if (!checkUIInput()) {// 界面输入验证
144. return;
145. }
146. Student student = getStudentFromUI();
147. if (isAdd) {
148. long id = dao.addStudent(student);
149. dao.closeDB();
150. if (id > 0) {
151. Toast.makeText(this, "保存成功， ID=" + id, 0).show();
152. finish();
153. } else {
154. Toast.makeText(this, "保存失败，请重新输入！", 0).show();
155. }
156. } else if (!isAdd) {
157. long id = dao.addStudent(student);
158. dao.closeDB();
159. if (id > 0) {
160. Toast.makeText(this, "更新成功", 0).show();
161. finish();
162. } else {
163. Toast.makeText(this, "更新失败，请重新输入！", 0).show();
164. }
165. }
167. } else if (v == resetButton) {
168. clearUIData();
169. } else if (v == dataText) {
170. showDialog(DATE_PICKER_ID);
171. }
172. }
174. /**
175. * 清空界面的数据
176. */
177. private void clearUIData() {
178. nameText.setText("");
179. ageText.setText("");
180. phoneText.setText("");
181. dataText.setText("");
182. box1.setChecked(false);
183. box2.setChecked(false);
184. group.clearCheck();
185. }
187. /**
188. * 收集界面输入的数据，并将封装成Student对象
189. */
190. private Student getStudentFromUI() {
191. String name = nameText.getText().toString();
192. int age = Integer.parseInt(ageText.getText().toString());
193. String sex = ((RadioButton) findViewById(group
194. .getCheckedRadioButtonId())).getText().toString();
195. String likes = "";
196. if (box1.isChecked()) { // basketball, football football
197. likes += box1.getText();
198. }
199. if (box2.isChecked()) {
200. if (likes.equals("")) {
201. likes += box2.getText();
202. } else {
203. likes += "," + box2.getText();
204. }
205. if (likes.equals("")) {
206. likes += box3.getText();
207. } else {
208. likes += "," + box3.getText();
209. }
210. }
211. String trainDate = dataText.getText().toString();
212. String phoneNumber = phoneText.getText().toString();
213. String modifyDateTime = getCurrentDateTime();
214. Student s=new Student(name, age, sex, likes, phoneNumber, trainDate,
215. modifyDateTime);
216. if (!isAdd) {
217. s.setId(Integer.parseInt(idText.getText().toString()));
218. dao.deleteStudentById(student_id);
219. }
220. return s;
221. }
223. /**
224. * 得到当前的日期时间
225. */
226. private String getCurrentDateTime() {
227. SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd hh:mm:ss");
228. return format.format(new Date());
229. }
230. /**
231. * 得到当前的日期
232. */
233. private String getCurrentDate() {
234. SimpleDateFormat format = new SimpleDateFormat("yyyy-MM-dd");
235. return format.format(new Date());
236. }
237. /**
238. * 验证用户是否按要求输入了数据
239. */
240. private boolean checkUIInput() { // name, age, sex
241. String name = nameText.getText().toString();
242. String age = ageText.getText().toString();
243. int id = group.getCheckedRadioButtonId();
244. String message = null;
245. View invadView = null;
246. if (name.trim().length() == 0) {
247. message = "请输入姓名！";
248. invadView = nameText;
249. } else if (age.trim().length() == 0) {
250. message = "请输入年龄！";
251. invadView = ageText;
252. } else if (id == -1) {
253. message = "请选择性别！";
254. }
255. if (message != null) {
256. Toast.makeText(this, message, 0).show();
257. if (invadView != null)
258. invadView.requestFocus();
259. return false;
260. }
261. return true;
262. }
264. private DatePickerDialog.OnDateSetListener onDateSetListener = new DatePickerDialog.OnDateSetListener() {
265. @Override
266. public void onDateSet(DatePicker view, int year, int monthOfYear,
267. int dayOfMonth) {
268. dataText.setText(year + "-" + (monthOfYear + 1) + "-" + dayOfMonth);
269. }
270. };
272. @Override
273. protected Dialog onCreateDialog(int id) {
274. switch (id) {
275. case DATE_PICKER_ID:
276. return new DatePickerDialog(this, onDateSetListener, 2011, 8, 14);
277. }
278. return null;
279. }
280. }

界面效果如下：

修改界面：

在这里我还做了一个额外的功能就是模糊查找，有想法的可以参考下。

StudentSearch代码：

package cn.yj3g.student.activity;

import cn.yj3g.student.dao.StudentDao;
import cn.yj3g.student.db.StudentDBHelper;
import cn.yj3g.student.entry.TableContanst;
import android.app.Activity;
import android.content.Intent;
import android.database.Cursor;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;
import android.widget.Toast;

public class StudentSearch extends Activity implements OnClickListener {
    private EditText nameText;
    private Button button;
    private Button reButton;
    private Cursor cursor;
    private SimpleCursorAdapter adapter;
    private ListView listView;
    private StudentDao dao;
    private Button returnButton;
    private LinearLayout layout;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.search);
        nameText = (EditText) findViewById(R.id.et_srarch);
        layout=(LinearLayout) findViewById(R.id.linersearch);
        button = (Button) findViewById(R.id.bn_sure_search);
        reButton = (Button) findViewById(R.id.bn_return);
        listView = (ListView) findViewById(R.id.searchListView);
        returnButton = (Button) findViewById(R.id.return_id);
        dao = new StudentDao(new StudentDBHelper(this));
        
        
        reButton.setOnClickListener(this);
        returnButton.setOnClickListener(this);
        button.setOnClickListener(this);    
    }

    @Override
    public void onClick(View v) {
        if (v == button) {
            reButton.setVisibility(View.GONE);    
            button.setVisibility(View.GONE);
            nameText.setVisibility(View.GONE);
            layout.setVisibility(View.VISIBLE);
            String name = nameText.getText().toString();
            cursor = dao.findStudent(name);
            if (!cursor.moveToFirst()) {
                Toast.makeText(this, "没有所查学员信息！", Toast.LENGTH_SHORT).show();
            } else
                //如果有所查询的信息，则将查询结果显示出来
                adapter = new SimpleCursorAdapter(this, R.layout.find_student_list_item,
                        cursor, new String[] { TableContanst.StudentColumns.ID,
                                TableContanst.StudentColumns.NAME,
                                TableContanst.StudentColumns.AGE,
                                TableContanst.StudentColumns.SEX,
                                TableContanst.StudentColumns.LIKES,
                                TableContanst.StudentColumns.PHONE_NUMBER,
                                TableContanst.StudentColumns.TRAIN_DATE },
                        new int[] { R.id.tv_stu_id, R.id.tv_stu_name,
                                R.id.tv_stu_age, R.id.tv_stu_sex,
                                R.id.tv_stu_likes, R.id.tv_stu_phone,
                                R.id.tv_stu_traindate });
            listView.setAdapter(adapter);
        }else if(v==reButton|v==returnButton){
            finish();
        }
    }
}

search.xml

1. xml version="1.0" encoding="utf-8"?>
2. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
3. android:orientation="vertical"
4. android:layout_width="fill_parent"
5. android:layout_height="fill_parent" >
6. <EditText
7. android:id="@+id/et_srarch"
8. android:layout_width="fill_parent"
9. android:layout_height="wrap_content"
10. android:hint="请输入学员姓名"
11. android:inputType="textPersonName"
12. />
13. <Button
14. android:id="@+id/bn_sure_search"
15. android:gravity="center"
16. android:layout_width="fill_parent"
17. android:layout_height="wrap_content"
18. android:text="确定"
19. />
20. <Button
21. android:id="@+id/bn_return"
22. android:gravity="center"
23. android:layout_width="fill_parent"
24. android:layout_height="wrap_content"
25. android:text="返回"
26. />
28. <LinearLayout android:id="@+id/linersearch"
29. android:orientation="vertical"
30. android:visibility="gone"
31. android:layout_width="fill_parent"
32. android:layout_height="wrap_content">
33. <ListView
34. android:id="@+id/searchListView"
35. android:layout_weight="1"
36. android:layout_width="fill_parent"
37. android:layout_height="wrap_content"/>
38. <Button
39. android:id="@+id/return_id"
40. android:layout_width="fill_parent"
41. android:layout_height="wrap_content"
42. android:text="返回"
43. />
44. LinearLayout>
45. LinearLayout>

find_student_list_item.xml

 1 xml version="1.0" encoding="utf-8"?>
 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 3     android:orientation="horizontal" android:layout_width="fill_parent"
 4     android:layout_height="wrap_content">
 5     <ImageView android:layout_width="fill_parent"
 6         android:layout_height="wrap_content" android:layout_weight="1"
 7         android:background="@drawable/icon" />
 8         <TextView android:id="@+id/tv_stu_id" android:layout_width="fill_parent"
 9         android:layout_height="wrap_content" android:layout_weight="1" />
10     <TextView android:id="@+id/tv_stu_name" android:layout_width="fill_parent"
11         android:layout_height="wrap_content" android:layout_weight="1" />
12     <TextView android:id="@+id/tv_stu_age" android:layout_width="fill_parent"
13         android:layout_height="wrap_content" android:layout_weight="1" />
14     <TextView android:id="@+id/tv_stu_sex" android:layout_width="fill_parent"
15         android:layout_height="wrap_content" android:layout_weight="1" />
16     <TextView android:id="@+id/tv_stu_likes" android:layout_width="fill_parent"
17         android:layout_height="wrap_content" android:layout_weight="1" />
18     <TextView android:id="@+id/tv_stu_phone"
19         android:layout_width="fill_parent" android:layout_height="wrap_content"
20         android:layout_weight="1" />
21     <TextView android:id="@+id/tv_stu_traindate" android:layout_width="fill_parent"
22         android:layout_height="wrap_content" android:layout_weight="1" />
23 
24 LinearLayout>

界面效果如下：

查询结果界面：

在这里还牵扯到了一些常量和数据库的连接以及增删改查等操作，我用我们老师的方法将他们分别放在不同的包里。下面附上代码：

StudentDao类

1. package cn.yj3g.student.dao;
3. import java.util.ArrayList;
4. import java.util.HashMap;
5. import java.util.List;
6. import java.util.Map;
7. import android.content.ContentValues;
8. import android.database.Cursor;
9. import android.database.sqlite.SQLiteDatabase;
10. import android.view.View;
11. import android.widget.SimpleCursorAdapter;
12. import android.widget.TextView;
13. import cn.yj3g.student.activity.R;
14. import cn.yj3g.student.db.StudentDBHelper;
15. import cn.yj3g.student.entry.Student;
16. import cn.yj3g.student.entry.TableContanst;
18. public class StudentDao {
20. private StudentDBHelper dbHelper;
21. private Cursor cursor;
22. public StudentDao(StudentDBHelper dbHelper) {
23. this.dbHelper = dbHelper;
24. }
25. // 添加一个Student对象数据到数据库表
26. public long addStudent(Student s) {
28. ContentValues values = new ContentValues();
29. values.put(TableContanst.StudentColumns.NAME, s.getName());
30. values.put(TableContanst.StudentColumns.AGE, s.getAge());
31. values.put(TableContanst.StudentColumns.SEX, s.getSex());
32. values.put(TableContanst.StudentColumns.LIKES, s.getLike());
33. values.put(TableContanst.StudentColumns.PHONE_NUMBER, s.getPhoneNumber());
34. values.put(TableContanst.StudentColumns.TRAIN_DATE, s.getTrainDate());
35. values.put(TableContanst.StudentColumns.MODIFY_TIME, s.getModifyDateTime());
36. return dbHelper.getWritableDatabase().insert(TableContanst.STUDENT_TABLE, null, values);
38. }
40. // 删除一个id所对应的数据库表student的记录
41. public int deleteStudentById(long id) {
43. return dbHelper.getWritableDatabase().delete(TableContanst.STUDENT_TABLE,
44. TableContanst.StudentColumns.ID + "=?", new String[] { id + "" });
45. }
47. // 更新一个id所对应数据库表student的记录
48. public int updateStudent(Student s) {
50. ContentValues values = new ContentValues();
51. values.put(TableContanst.StudentColumns.NAME, s.getName());
52. values.put(TableContanst.StudentColumns.AGE, s.getAge());
53. values.put(TableContanst.StudentColumns.SEX, s.getSex());
54. values.put(TableContanst.StudentColumns.LIKES, s.getLike());
55. values.put(TableContanst.StudentColumns.PHONE_NUMBER, s.getPhoneNumber());
56. values.put(TableContanst.StudentColumns.TRAIN_DATE, s.getTrainDate());
57. values.put(TableContanst.StudentColumns.MODIFY_TIME, s.getModifyDateTime());
58. return dbHelper.getWritableDatabase().update(TableContanst.STUDENT_TABLE, values,
59. TableContanst.StudentColumns.ID + "=?", new String[] { s.getId() + "" });
61. }
63. // 查询所有的记录
64. public List<Map<String,Object>> getAllStudents() { //modify_time desc
66. List<Map<String, Object>> data = new ArrayList<Map<String,Object>>();
67. Cursor cursor = dbHelper.getWritableDatabase().query(TableContanst.STUDENT_TABLE, null, null, null,
68. null, null, TableContanst.StudentColumns.MODIFY_TIME+" desc");
69. while(cursor.moveToNext()) {
70. Map<String, Object> map = new HashMap<String, Object>(8);
71. long id = cursor.getInt(cursor.getColumnIndex(TableContanst.StudentColumns.ID));
72. map.put(TableContanst.StudentColumns.ID, id);
73. String name = cursor.getString(cursor.getColumnIndex(TableContanst.StudentColumns.NAME));
74. map.put(TableContanst.StudentColumns.NAME, name);
75. int age = cursor.getInt(cursor.getColumnIndex(TableContanst.StudentColumns.AGE));
76. map.put(TableContanst.StudentColumns.AGE, age);
77. String sex = cursor.getString(cursor.getColumnIndex(TableContanst.StudentColumns.SEX));
78. map.put(TableContanst.StudentColumns.SEX, sex);
79. String likes = cursor.getString(cursor.getColumnIndex(TableContanst.StudentColumns.LIKES));
80. map.put(TableContanst.StudentColumns.LIKES, likes);
81. String phone_number = cursor.getString(cursor.getColumnIndex(TableContanst.StudentColumns.PHONE_NUMBER));
82. map.put(TableContanst.StudentColumns.PHONE_NUMBER, phone_number);
83. String train_date = cursor.getString(cursor.getColumnIndex(TableContanst.StudentColumns.TRAIN_DATE));
84. map.put(TableContanst.StudentColumns.TRAIN_DATE, train_date);
85. String modify_time = cursor.getString(cursor.getColumnIndex(TableContanst.StudentColumns.MODIFY_TIME));
86. map.put(TableContanst.StudentColumns.MODIFY_TIME, modify_time);
87. data.add(map);
88. }
89. return data;
90. }
91. //模糊查询一条记录
92. public Cursor findStudent(String name){
94. Cursor cursor = dbHelper.getWritableDatabase().query(TableContanst.STUDENT_TABLE, null, "name like ?",
95. new String[] { "%" + name + "%" }, null, null, null,null);
96. return cursor;
97. }
98. //按姓名进行排序
99. public Cursor sortByName(){
100. Cursor cursor = dbHelper.getWritableDatabase().query(TableContanst.STUDENT_TABLE, null,null,
101. null, null, null,TableContanst.StudentColumns.NAME);
102. return cursor;
103. }
104. //按入学日期进行排序
105. public Cursor sortByTrainDate(){
106. Cursor cursor = dbHelper.getWritableDatabase().query(TableContanst.STUDENT_TABLE, null,null,
107. null, null, null,TableContanst.StudentColumns.TRAIN_DATE);
108. return cursor;
109. }
110. //按学号进行排序
111. public Cursor sortByID(){
112. Cursor cursor = dbHelper.getWritableDatabase().query(TableContanst.STUDENT_TABLE, null,null,
113. null, null, null,TableContanst.StudentColumns.ID);
114. return cursor;
115. }
116. public void closeDB() {
117. dbHelper.close();
118. }
119. //自定义的方法通过View和Id得到一个student对象
120. public Student getStudentFromView(View view, long id) {
121. TextView nameView = (TextView) view.findViewById(R.id.tv_stu_name);
122. TextView ageView = (TextView) view.findViewById(R.id.tv_stu_age);
123. TextView sexView = (TextView) view.findViewById(R.id.tv_stu_sex);
124. TextView likeView = (TextView) view.findViewById(R.id.tv_stu_likes);
125. TextView phoneView = (TextView) view.findViewById(R.id.tv_stu_phone);
126. TextView dataView = (TextView) view.findViewById(R.id.tv_stu_traindate);
127. String name = nameView.getText().toString();
128. int age = Integer.parseInt(ageView.getText().toString());
129. String sex = sexView.getText().toString();
130. String like = likeView.getText().toString();
131. String phone = phoneView.getText().toString();
132. String data = dataView.getText().toString();
133. Student student = new Student(id, name, age, sex, like, phone, data,null);
134. return student;
135. }
137. }

StudentDBHelper类

 1 package cn.yj3g.student.db;
 2 
 3 import cn.yj3g.student.entry.TableContanst;
 4 import android.content.Context;
 5 import android.database.sqlite.SQLiteDatabase;
 6 import android.database.sqlite.SQLiteDatabase.CursorFactory;
 7 import android.database.sqlite.SQLiteOpenHelper;
 8 import android.util.Log;
 9 
10 public class StudentDBHelper extends SQLiteOpenHelper {
11 
12     private static final String TAG = "StudentDBHelper";
13 
14     public static final String DB_NAME = "student_manager.db";
15     public static final int VERSION = 1;
16     //构造方法
17     public StudentDBHelper(Context context, String name, CursorFactory factory, int version) {
18         super(context, name, factory, version);
19 
20     }
21 
22     public StudentDBHelper(Context context) {
23         this(context, DB_NAME, null, VERSION);
24     }
25     //创建数据库
26     @Override
27     public void onCreate(SQLiteDatabase db) {
28         Log.v(TAG, "onCreate");
29         db.execSQL("create table "
30                 + TableContanst.STUDENT_TABLE
31                 + "(_id Integer primary key AUTOINCREMENT,"
32                 + "name char,age integer, sex char, likes char, phone_number char,train_date date, "
33                 + "modify_time DATETIME)");
34     }
35     //更新数据库
36     @Override
37     public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
38         Log.v(TAG, "onUpgrade");
39     }
40 
41 }

Student类：

1. package cn.yj3g.student.entry;
3. import java.io.Serializable;
5. import android.view.View;
6. import android.widget.TextView;
7. import cn.yj3g.student.activity.R;
9. public class Student implements Serializable{
11. private long id;
12. private String name;
13. private int age;
14. private String sex;
15. private String like;
16. private String phoneNumber;
17. private String trainDate;
18. private String modifyDateTime;
21. public Student() {
22. super();
23. }
25. public Student(long id, String name, int age, String sex, String like, String phoneNumber,
26. String trainDate, String modifyDateTime) {
27. super();
28. this.id = id;
29. this.name = name;
30. this.age = age;
31. this.sex = sex;
32. this.like = like;
33. this.phoneNumber = phoneNumber;
34. this.trainDate = trainDate;
35. this.modifyDateTime = modifyDateTime;
36. }
38. public Student(String name, int age, String sex, String like, String phoneNumber,
39. String trainDate, String modifyDateTime) {
40. super();
41. this.name = name;
42. this.age = age;
43. this.sex = sex;
44. this.like = like;
45. this.phoneNumber = phoneNumber;
46. this.trainDate = trainDate;
47. this.modifyDateTime = modifyDateTime;
48. }
50. public long getId() {
51. return id;
52. }
53. public void setId(long id) {
54. this.id = id;
55. }
56. public String getName() {
57. return name;
58. }
59. public void setName(String name) {
60. this.name = name;
61. }
62. public int getAge() {
63. return age;
64. }
65. public void setAge(int age) {
66. this.age = age;
67. }
68. public String getSex() {
69. return sex;
70. }
71. public void setSex(String sex) {
72. this.sex = sex;
73. }
74. public String getLike() {
75. return like;
76. }
77. public void setLike(String like) {
78. this.like = like;
79. }
80. public String getPhoneNumber() {
81. return phoneNumber;
82. }
83. public void setPhoneNumber(String phoneNumber) {
84. this.phoneNumber = phoneNumber;
85. }
86. public String getTrainDate() {
87. return trainDate;
88. }
89. public void setTrainDate(String trainDate) {
90. this.trainDate = trainDate;
91. }
92. public String getModifyDateTime() {
93. return modifyDateTime;
94. }
95. public void setModifyDateTime(String modifyDateTime) {
96. this.modifyDateTime = modifyDateTime;
97. }
98. @Override
99. public int hashCode() {
100. final int prime = 31;
101. int result = 1;
102. result = prime * result + age;
103. result = prime * result + (int) (id ^ (id >>> 32));
104. result = prime * result + ((like == null) ? 0 : like.hashCode());
105. result = prime * result + ((modifyDateTime == null) ? 0 : modifyDateTime.hashCode());
106. result = prime * result + ((name == null) ? 0 : name.hashCode());
107. result = prime * result + ((phoneNumber == null) ? 0 : phoneNumber.hashCode());
108. result = prime * result + ((sex == null) ? 0 : sex.hashCode());
109. result = prime * result + ((trainDate == null) ? 0 : trainDate.hashCode());
110. return result;
111. }
112. @Override
113. public boolean equals(Object obj) {
114. if (this == obj)
115. return true;
116. if (obj == null)
117. return false;
118. if (getClass() != obj.getClass())
119. return false;
120. Student other = (Student) obj;
121. if (age != other.age)
122. return false;
123. if (id != other.id)
124. return false;
125. if (like == null) {
126. if (other.like != null)
127. return false;
128. } else if (!like.equals(other.like))
129. return false;
130. if (modifyDateTime == null) {
131. if (other.modifyDateTime != null)
132. return false;
133. } else if (!modifyDateTime.equals(other.modifyDateTime))
134. return false;
135. if (name == null) {
136. if (other.name != null)
137. return false;
138. } else if (!name.equals(other.name))
139. return false;
140. if (phoneNumber == null) {
141. if (other.phoneNumber != null)
142. return false;
143. } else if (!phoneNumber.equals(other.phoneNumber))
144. return false;
145. if (sex == null) {
146. if (other.sex != null)
147. return false;
148. } else if (!sex.equals(other.sex))
149. return false;
150. if (trainDate == null) {
151. if (other.trainDate != null)
152. return false;
153. } else if (!trainDate.equals(other.trainDate))
154. return false;
155. return true;
156. }
157. @Override
158. public String toString() {
159. return "Student [id=" + id + ", name=" + name + "]";
160. }
161. }

常量TableContanst类：

 1 package cn.yj3g.student.entry;
 2 
 3 public final class TableContanst {
 4     
 5     public static final String STUDENT_TABLE = "student";
 6     
 7     public static final class StudentColumns {
 8         public static final String ID = "_id";
 9         public static final String NAME = "name";
10         public static final String AGE = "age";
11         public static final String SEX = "sex";
12         public static final String LIKES = "likes";
13         public static final String PHONE_NUMBER = "phone_number";
14         public static final String TRAIN_DATE = "train_date";
15         public static final String MODIFY_TIME = "modify_time";
16     }
17 }

最后我将我的values里的strings.xml和AndroidManifest.xml附在下面，以供大家参考。

strings.xml：

1. xml version="1.0" encoding="utf-8"?>
2. <resources>
3. <string name="hello">Hello World, TextStudentManager!string>
4. <string name="app_name">学员管理系统string>
5. <string name="information_write">学员信息修改string>
6. <string name="button1">男string>
7. <string name="button2">女string>
8. <string name="box1">唱歌string>
9. <string name="box2">跳舞string>
10. <string name="box3">健身string>
11. <string name="myButton">添加学员信息string>
12. <string name="spinner">请选择string>
13. resources>

AndroidManifest.xml：

 1 xml version="1.0" encoding="utf-8"?>
 2 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
 3       package="cn.yj3g.student.activity"
 4       android:versionCode="1"
 5       android:versionName="1.0">
 6     <uses-sdk android:minSdkVersion="8" />
 7 
 8     <application android:icon="@drawable/student"  android:label="@string/app_name">
 9         <activity android:name=".StudentListActivity"
10                   android:label="学员信息列表">
11             <intent-filter>
12                 <action android:name="android.intent.action.MAIN" />
13                 <category android:name="android.intent.category.LAUNCHER" />
14             intent-filter>
15         activity>
16         
17          <activity android:name=".AddStudentActivity"
18                   android:label="学员信息添加">
19         activity>
20           <activity android:name=".ShowStudentActivity"
21                   android:label="学员详细信息">
22         activity>
23          <activity android:name=".StudentSearch"
24                   android:label="学员信息查询">
25         activity>
26          <activity android:name=".SearchResult"
27                   android:label="查询结果">
28         activity>
29         <provider 
30         android:name=".MyStudentManagerProvider"
31         android:authorities="cn.yj3g.student.activity.MyStudentManagerProvider">provider>
32         <uses-library android:name="android.test.runner" />  
33         
34     application>
35     <uses-permission android:name="android.permission.READ_CONTACTS">uses-permission> 
36     <instrumentation android:name="android.test.InstrumentationTestRunner"
37           android:targetPackage="cn.yj3g.student.activity" android:label="Tests for My App" />
38 manifest>

由于自己也是初学者，所以大家发现什么问题，可以留言，大家一起学习。

原文地址： http://www.cnblogs.com/zxl-jay/archive/2011/09/21/2182890.html#2302140