Android+SQLite数据库实现的生词记事本功能实例

package example.com.myapplication;
import android.app.Activity;
import android.content.Intent;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;
public class Dict extends Activity
{
  MyDatabaseHelper dbHelper;
  Button insert = null;
  Button search = null;
  @Override
  public void onCreate(Bundle savedInstanceState)
  {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    // 创建MyDatabaseHelper对象，指定数据库版本为1，此处使用相对路径即可，
    // 数据库文件自动会保存在程序的数据文件夹的databases目录下。
    dbHelper = new MyDatabaseHelper(this
        , "myDict.db3" , 1);
    insert = (Button)findViewById(R.id.insert);
    search = (Button)findViewById(R.id.search);
    insert.setOnClickListener(new View.OnClickListener()
    {
      @Override
      public void onClick(View source)
      {
        //获取用户输入
        String word = ((EditText)findViewById(R.id.word))
            .getText().toString();
        String detail = ((EditText)findViewById(R.id.detail))
            .getText().toString();
        //插入生词记录
        insertData(dbHelper.getReadableDatabase() , word , detail);
        //显示提示信息
        Toast.makeText(Dict.this, "添加生词成功！" , Toast.LENGTH_SHORT)
            .show();
      }
    });
    search.setOnClickListener(new View.OnClickListener()
    {
      @Override
      public void onClick(View source)
      {
        // 获取用户输入
        String key = ((EditText) findViewById(R.id.key)).getText()
            .toString();
        // 执行查询
        Cursor cursor = dbHelper.getReadableDatabase().rawQuery(
            "select * from dict where word like ? or detail like ?",
            new String[]{"%" + key + "%" , "%" + key + "%"});
        //创建一个Bundle对象
        Bundle data = new Bundle();
        data.putSerializable("data", converCursorToList(cursor));
        //创建一个Intent
        Intent intent = new Intent(Dict.this
            , ResultActivity.class);
        intent.putExtras(data);
        //启动Activity
        startActivity(intent);
      }
    });
  }
  protected ArrayList<Map<String ,String>>
  converCursorToList(Cursor cursor)
  {
    ArrayList<Map<String,String>> result =
      new ArrayList<Map<String ,String>>();
    //遍历Cursor结果集
    while(cursor.moveToNext())
    {
      //将结果集中的数据存入ArrayList中
      Map<String, String> map = new
          HashMap<String,String>();
      //取出查询记录中第2列、第3列的值
      map.put("word" , cursor.getString(1));
      map.put("detail" , cursor.getString(2));
      result.add(map);
    }
    return result;
  }
  private void insertData(SQLiteDatabase db
      , String word , String detail)
  {
    //执行插入语句
    db.execSQL("insert into dict values(null , ? , ?)"
        , new String[]{word , detail});
  }
  @Override
  public void onDestroy()
  {
    super.onDestroy();
    //退出程序时关闭MyDatabaseHelper里的SQLiteDatabase
    if (dbHelper != null)
    {
      dbHelper.close();
    }
  }
}

<!--?xml version="1.0" encoding="utf-8"?-->
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  android:orientation="vertical">
  <EditText
    android:id="@+id/word"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:hint="@string/input"/>
  <EditText
    android:id="@+id/detail"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:hint="@string/input"
    android:lines="3"/>
  <Button
    android:id="@+id/insert"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/insert"/>
  <EditText
    android:id="@+id/key"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:hint="@string/record"/>
  <Button
    android:id="@+id/search"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:text="@string/search"/>
  <ListView
    android:id="@+id/show"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"/>
</LinearLayout>

package example.com.myapplication;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.ListView;
import android.widget.SimpleAdapter;
import java.util.List;
import java.util.Map;
public class ResultActivity extends Activity
{
  @Override
  public void onCreate(Bundle savedInstanceState)
  {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.popup);
    ListView listView = (ListView)findViewById(R.id.show);
    Intent intent = getIntent();
    //获取该intent所携带的数据
    Bundle data = intent.getExtras();
    //从Bundle数据包中取出数据
    @SuppressWarnings("unchecked")
    List<Map<String,String>> list =
      (List<Map<String ,String>>)data.getSerializable("data");
    //将List封装成SimpleAdapter
    SimpleAdapter adapter = new SimpleAdapter(
        ResultActivity.this , list
        , R.layout.ine , new String[]{"word" , "detail"}
        , new int[]{R.id.my_title , R.id.my_content});
    //填充ListView
    listView.setAdapter(adapter);
  }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:id="@+id/fragment">
  <TextView
    android:id="@+id/my_title"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />
  <TextView
    android:id="@+id/my_content"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="match_parent"
  android:id="@+id/fragment">
  <TextView
    android:id="@+id/my_title"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />
  <TextView
    android:id="@+id/my_content"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content" />
</LinearLayout>

package example.com.myapplication;
import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;
public class MyDatabaseHelper extends SQLiteOpenHelper
{
  final String CREATE_TABLE_SQL =
      "create table dict(_id integer primary key autoincrement , word , detail)";
  public MyDatabaseHelper(Context context, String name, int version)
  {
    super(context, name, null, version);
  }
  @Override
  public void onCreate(SQLiteDatabase db)
  {
    // 第一个使用数据库时自动建表
    db.execSQL(CREATE_TABLE_SQL);
  }
  @Override
  public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion)
  {
    System.out.println("--------onUpdate Called--------"
        + oldVersion + "--->" + newVersion);
  }
}