Android中结合OrmLite for android组件对SQLite的CRUD(增删改查)操作实例（三）

StudentListActivity.java源码：

package com.andyidea.ormsqlite;

import java.sql.SQLException;
import java.util.List;

import Android.app.AlertDialog;
import Android.content.Context;
import Android.content.DialogInterface;
import Android.content.Intent;
import Android.os.Bundle;
import Android.view.ContextMenu;
import Android.view.ContextMenu.ContextMenuInfo;
import Android.view.LayoutInflater;
import Android.view.Menu;
import Android.view.MenuItem;
import Android.view.View;
import Android.view.ViewGroup;
import Android.widget.AdapterView.AdapterContextMenuInfo;
import Android.widget.BaseAdapter;
import Android.widget.ListView;
import Android.widget.TextView;

import com.andyidea.bean.Student;
import com.andyidea.db.DatabaseHelper;
import com.j256.ormlite.Android.apptools.OrmLiteBaseActivity;
import com.j256.ormlite.dao.Dao;

public class StudentListActivity extends OrmLiteBaseActivity<DatabaseHelper> {

    private Context mContext;
    private ListView lvStudents;
    private Dao<Student,Integer> stuDao;
    private List<Student> students;
    private StudentsAdapter adapter;
    private Student mStudent;

    private final int MENU_VIEW = Menu.FIRST;
    private final int MENU_EDIT = Menu.FIRST+1;
    private final int MENU_DELETE = Menu.FIRST+2;

    private int position;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.students);
        mContext = getApplicationContext();

        lvStudents = (ListView)findViewById(R.id.stulist);
        registerForContextMenu(lvStudents);  //注册上下文菜单

        queryListViewItem();

        adapter = new StudentsAdapter(students);
        lvStudents.setAdapter(adapter);

    }

    @Override
    public void onCreateContextMenu(ContextMenu menu, View v,
            ContextMenuInfo menuInfo) {
        if(v == lvStudents)
            position = ((AdapterContextMenuInfo)menuInfo).position;

        menu.add(0,MENU_VIEW, 0, "查看");
        menu.add(0,MENU_EDIT, 0, "编辑");
        menu.add(0,MENU_DELETE,0,"删除");
        super.onCreateContextMenu(menu, v, menuInfo);
    }

    @Override
    public boolean onContextItemSelected(MenuItem item) {
        switch (item.getItemId()) {
        case MENU_VIEW:
            viewListViewItem(position);
            break;
        case MENU_EDIT:
            editListViewItem(position);
            break;
        case MENU_DELETE:
            deleteListViewItem(position);
            break;
        default:
            break;
        }
        return super.onContextItemSelected(item);
    }

    /**
     * 查询记录项
     */
    private void queryListViewItem(){
        try {
            stuDao = getHelper().getStudentDao();
            //查询所有的记录项
            students = stuDao.queryForAll();
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    /**
     * 查看记录项
     * @param position
     */
    private void viewListViewItem(int position){
        mStudent = students.get(position);
        Intent intent = new Intent();
        intent.setClass(mContext, MainActivity.class);
        intent.putExtra("action", "viewone");
        intent.putExtra("entity", mStudent);
        startActivity(intent);
    }

    /**
     * 编辑记录项
     */
    private void editListViewItem(int position){
        mStudent = students.get(position);
        Intent intent = new Intent();
        intent.setClass(mContext, MainActivity.class);
        intent.putExtra("action", "edit");
        intent.putExtra("entity", mStudent);
        startActivity(intent);
    }

    /**
     * 删除记录项
     * @param position
     */
    private void deleteListViewItem(int position){
        final int pos = position;
        AlertDialog.Builder builder2 = new AlertDialog.Builder(StudentListActivity.this);
        builder2.setIcon(Android.R.drawable.ic_dialog_alert)
                .setTitle("警告")
                .setMessage("确定要删除该记录");
        builder2.setPositiveButton("确定", new DialogInterface.OnClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int which) {
                Student mDelStudent = (Student)lvStudents.getAdapter().getItem(pos);
                try {
                    stuDao.delete(mDelStudent); //删除记录
                    queryListViewItem();
                } catch (SQLException e) {
                    e.printStackTrace();
                }

            }
        });
        builder2.setNegativeButton("取消", new DialogInterface.OnClickListener() {

            @Override
            public void onClick(DialogInterface dialog, int which) {
                dialog.dismiss();
            }
        });
        builder2.show();
    }

    class StudentsAdapter extends BaseAdapter{

        private List<Student> listStu;

        public StudentsAdapter(List<Student> students){
            super();
            this.listStu = students;
        }

        @Override
        public int getCount() {
            return listStu.size();
        }

        @Override
        public Student getItem(int position) {
            return listStu.get(position);
        }

        @Override
        public long getItemId(int position) {
            return position;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            ViewHolder holder;
            if(convertView == null){
                LayoutInflater mInflater = (LayoutInflater) mContext
                        .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
                convertView = mInflater.inflate(R.layout.studentitem, null);
                holder = new ViewHolder();
                holder.tvNO = (TextView)convertView.findViewById(R.id.itemno);
                holder.tvName = (TextView)convertView.findViewById(R.id.itemname);
                holder.tvScore = (TextView)convertView.findViewById(R.id.itemscore);
                convertView.setTag(holder);
            }else{
                holder = (ViewHolder)convertView.getTag();
            }

            Student objStu = listStu.get(position);
            holder.tvNO.setText(objStu.getStuNO());
            holder.tvName.setText(objStu.getName());
            holder.tvScore.setText(String.valueOf(objStu.getScore()));

            return convertView;
        }

    }

    static class ViewHolder{
        TextView tvNO;
        TextView tvName;
        TextView tvScore;
    }

}

【6】成功运行程序的截图效果：