Question

我有一个listview，我希望它能做两个不同的功能。第一个是工作，当你从列表中选择它开始另一个活动时，我在onListItemClick（）方法上执行此操作。第二个是我遇到问题的那个。我在列表的每个成员上都有一个复选框，我希望能够选择多个元素并对所选成员执行某些操作，任何事情！因为在我的代码中它不起作用。目前我试图在OnItemClickListener（）方法中实现，但它没有顺利

这是我的带有listview的java代码：

public class Lista_general extends ListActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.lista_general);

ListView list = getListView();

final Button bt = (Button) findViewById(R.id.button2);

// open database
AdminSQLiteOpenHelper dbhelper = new AdminSQLiteOpenHelper(getBaseContext());
SQLiteDatabase db = dbhelper.getReadableDatabase();

//necessary for the simple cursor adapter
String columns[] = new String[] { "_id", "nombre", "categoria" };

// cursor whith the query of the database
Cursor c = db.query("PRODUCTO ORDER BY categoria ", columns, null,null, null, null, null);

//necessary for the simple cursor adapter
c.moveToFirst();
String from[] = new String[] { "nombre", "categoria", };
int to[] = new int[] { R.id.name, R.id.cate, };


SimpleCursorAdapter adapter = new SimpleCursorAdapter(getBaseContext(), R.layout.productos, c, from, to,SimpleCursorAdapter.FLAG_REGISTER_CONTENT_OBSERVER);

setListAdapter(adapter);

// close database
db.close();

list.setOnItemClickListener(new OnItemClickListener() {

@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,long arg3) {
            // TODO Auto-generated method stub

//  I think here is where i can implement the use of the checkboxes

}
});

}



@Override
public void onListItemClick(ListView l, View v, int arg2, long arg3) {


Intent i = new Intent(Lista_general.this, Agregar_articulo.class);
i.putExtra("id", String.valueOf(arg3));
i.putExtra("num", "y");
startActivity(i);
}

public void lanzar(View view) {
Intent i = new Intent(Lista_general.this, Agregar_articulo.class);
i.putExtra("num", "n");
startActivity(i);
}
}

这是我使用listview的布局：lista_general.xml

<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent">

<LinearLayout
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:gravity="center"
    android:orientation="horizontal" >

    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/eliminar"
        android:onClick="eliminar" 
        android:enabled="false"/>

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:onClick="lanzar"
        android:text="@string/agregar_art" />

</LinearLayout>

<ListView
     android:id="@android:id/list"
    android:layout_width="fill_parent"
    android:fadingEdge="none"
    android:cacheColorHint="@null"
    android:layout_height="fill_parent"
    android:choiceMode="multipleChoice">

</ListView>
</LinearLayout>

以下是每行的代码：productos.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="?android:attr/listPreferredItemHeight"
android:padding="6dip"  >


<ImageView
    android:id="@+id/icon"
    android:layout_width="wrap_content"
    android:layout_height="fill_parent"
    android:layout_alignParentBottom="true"
    android:layout_alignParentTop="true"
    android:layout_marginRight="6dip"

    android:src="@drawable/ic_launcher" />

<TextView
    android:id="@+id/cate"
    android:layout_width="fill_parent"
    android:layout_height="26dip"
    android:layout_alignParentBottom="true"
    android:layout_alignParentRight="true"
    android:layout_toRightOf="@id/icon"
    android:ellipsize="marquee"
    android:singleLine="true"
    android:text="Description"
    android:textSize="12sp" />

<TextView
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_above="@id/cate"
    android:layout_alignParentRight="true"
    android:layout_alignParentTop="true"
    android:layout_alignWithParentIfMissing="true"
    android:layout_toRightOf="@id/icon"
    android:gravity="center_vertical"
    android:text="Example application"
    android:clickable="true"
    android:textSize="16sp" 
     android:id="@+id/name" 
     />

<CheckBox
    android:id="@+id/check"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentRight="true"
    android:layout_centerVertical="true"
    android:text=""
    android:focusable="false"
    android:focusableInTouchMode="false"  
    android:clickable="true"
   />

</RelativeLayout>

这是我的应用程序的图像。我的目标是，当您使用复选框选择不同的元素时，会出现名为Eliminar的按钮，然后您可以消除它们。

http://i39.tinypic.com/1z6z0y0.png

在Listview中使用复选框，该复选框实现数据库中的游标

0 个答案: