android学生信息管理系统源码
利用ListView和数据库做一个学员信息管理系统。下面把做的代码复制下来，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
encoding="utf-8"?>
android:orientation="horizontal"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
>
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_weight="1"
android:background="@drawable/icon"/>
android:layout_width="fill_parent"
android:layout_gravity="center"
android:layout_height="wrap_content"
android:layout_weight="1"/>
android:layout_width="fill_parent"
android:layout_gravity="center"
android:layout_height="wrap_content"
android:layout_weight="1"/>
android:layout_width="fill_parent"
android:layout_gravity="center"
android:layout_height="wrap_content"
android:layout_weight="1"/>
android:layout_width="fill_parent"
android:layout_gravity="center"
android:layout_height="wrap_content"
android:layout_weight="1"/>
android:layout_width="fill_parent"
android:layout_gravity="center"
android:layout_height="wrap_content"
android:layout_weight="1"
android:visibility="gone"/>
android:layout_width="fill_parent"
android:layout_gravity="center"
android:layout_height="wrap_content"
android:layout_weight="1"
android:visibility="gone"/>
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_weight="1"
android:visibility="gone"/>
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"> 2 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; 2 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; 10 11 public class ShowStudentActivity extends Activity { 12 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 } 27 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; 2 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; 8 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; 32 33 public class AddStudentActivity extends Activity implements OnClickListener { 34 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; 53 54 private StudentDao dao; 55 private boolean isAdd = true; 56 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); 72 73 restoreButton = (Button) findViewById(R.id.btn_save); 74 resetButton = (Button) findViewById(R.id.btn_clear); 75 dao = new StudentDao(new StudentDBHelper(this)); 76 77 // 设置监听 78 restoreButton.setOnClickListener(this); 79 resetButton.setOnClickListener(this); 80 dataText.setOnClickListener(this); 81 checkIsAddStudent(); 82 } 83 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); 98 99 } 100 } 101 102 /** 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 } 139 140 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 } 166 167 } else if (v == resetButton) { 168 clearUIData(); 169 } else if (v == dataText) { 170 showDialog(DATE_PICKER_ID); 171 } 172 } 173 174 /** 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 } 186 187 /** 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 } 222 223 /** 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 } 263 264 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 }; 271 272 @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 /> 27 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; 2 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; 17 18 public class StudentDao { 19 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) { 27 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); 37 38 } 39 40 // 删除一个id所对应的数据库表student的记录 41 public int deleteStudentById(long id) { 42 43 return dbHelper.getWritableDatabase().delete(TableContanst.STUDENT_TABLE, 44 TableContanst.StudentColumns.ID + "=?", new String[] { id + "" }); 45 } 46 47 // 更新一个id所对应数据库表student的记录 48 public int updateStudent(Student s) { 49 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() + "" }); 60 61 } 62 63 // 查询所有的记录 64 public List<Map<String,Object>> getAllStudents() { //modify_time desc 65 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){ 93 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 } 136 137 }
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; 2 3 import java.io.Serializable; 4 5 import android.view.View; 6 import android.widget.TextView; 7 import cn.yj3g.student.activity.R; 8 9 public class Student implements Serializable{ 10 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; 19 20 21 public Student() { 22 super(); 23 } 24 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 } 37 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 } 49 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。