【Android】继承SimpleCursorAdapter定制Adapter

SimpleCursorAdapter是一个简单的adapter，提供数据库Cursor到TextView的映射。

在实际开发过程中，除了TextView外，往往还需要依赖于数据库数据的其它的组件。

通过继承SimpleCursorAdapter，重写bindView(View view, Context context, Cursor cursor)来实现

 

示例代码

Main.java

 

package dyingbleed.iteye;

import android.app.ListActivity;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.SimpleCursorAdapter;

public class Main extends ListActivity {
	
	private MySQLiteOpenHelper sqlite;
	private MyListViewAdapter adapter;
	
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        sqlite = new MySQLiteOpenHelper(this);
        
        initListView();
    }
    
    @Override
	protected void onDestroy() {
    	sqlite.close();
		super.onDestroy();
	}
    
    private void initListView() {
    	SQLiteDatabase readableDB = sqlite.getReadableDatabase();
    	Cursor cursor = readableDB.query(MySQLiteOpenHelper.TABLE_NAME, null, null, null, null, null, null);
        adapter = new MyListViewAdapter(this, cursor);
        setListAdapter(adapter);
    }

	private class MyListViewAdapter extends SimpleCursorAdapter {

    	public MyListViewAdapter(Context context, Cursor c) {
    		super(context, R.layout.item, c, new String[] {MySQLiteOpenHelper.VOLUMN_NAME}, new int[] {R.id.item_NameTextView});
    	}

    	@Override
    	public void bindView(View view, Context context, Cursor cursor) {
    		super.bindView(view, context, cursor);
    		final int id = cursor.getInt(cursor.getColumnIndex(MySQLiteOpenHelper.VOLUMN_ID));
    		Button delete = (Button) view.findViewById(R.id.item_DeleteButton);
    		delete.setOnClickListener(new View.OnClickListener() {
    			
    			@Override
    			public void onClick(View v) {
    				SQLiteDatabase writableDB = sqlite.getWritableDatabase();
    				writableDB.delete(MySQLiteOpenHelper.TABLE_NAME
    						, MySQLiteOpenHelper.VOLUMN_ID+"=?" //添加"=？"
    						, new String[] {String.valueOf(id)});
    				writableDB.close();
    				initListView();
    			}
    		});
    	}

    }

}

 

MySQLiteOpenHelper.java

package dyingbleed.iteye;

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

public class MySQLiteOpenHelper extends SQLiteOpenHelper {
	
	public static final String DATABASE_NAME = "dyingbleed";
	
	public static final String TABLE_NAME = "list";
	public static final String VOLUMN_ID = "_id";
	public static final String VOLUMN_NAME = "name";

	public MySQLiteOpenHelper(Context context) {
		super(context, TABLE_NAME, null, 1);
		// TODO Auto-generated constructor stub
	}

	@Override
	public void onCreate(SQLiteDatabase db) {
		String sql = "CREATE TABLE IF NOT EXISTS "
				+TABLE_NAME
				+"("
				+VOLUMN_ID
				+" INTEGER PRIMARY KEY AUTOINCREMENT,"
				+VOLUMN_NAME
				+" TEXT UNIQUE)";
		db.execSQL(sql);
	}

	@Override
	public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
		// TODO Auto-generated method stub
		
	}

} 

 

运行截图

评论

2 楼 dyingbleed 2012-08-25  

sword_java 写道

实现的 太片面了， 只有 delete操作， 如果点击Item项呢？ 还有， 不能每次点击new一个listener， 应该继承下

这只是一个范例，哥！范例！！！

1 楼 sword_java 2012-04-16  

实现的 太片面了， 只有 delete操作， 如果点击Item项呢？ 还有， 不能每次点击new一个listener， 应该继承下