Android开发之长按事件的--改变桌…

鼠标长按在图片上边，桌面背景将会变换

.xml文件

     <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    android:orientation="vertical"

    tools:context=".MainActivity" >

    <TextView

        android:id="@+id/txt"

        android:layout_width="fill_parent"

        android:layout_height="wrap_content"

        android:text="长按图片将甚至为桌面背景" />

    

    <ImageView 

        android:id="@+id/img"

        android:layout_width="fill_parent"

        android:layout_height="fill_parent"

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

</LinearLayout>

.java文件

public class MainActivity extends Activity {

private TextView info=null;

private ImageView img=null;

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

this.info=(TextView) super.findViewById(R.id.txt);

this.img=(ImageView) super.findViewById(R.id.img);

//添加长按事件

this.img.setOnLongClickListener(new OnLongClickAbleImg());

}

private class OnLongClickAbleImg implements OnLongClickListener{

public boolean onLongClick(View v) {

//首先清除已有的桌面

try {

MainActivity.this.clearWallpaper();

//设置图片为我们的桌面

MainActivity.this.setWallpaper(MainActivity.this.img.getResources().openRawResource(R.drawable.view));

MainActivity.this.info.setText("手机桌面背景已经修改");

} catch (IOException e) {

MainActivity.this.info.setText("手机桌面背景失败");

e.printStackTrace();

}

return false;

}

}

}

还需要在我们的AndroidManifest.xml添加权限

<uses-permission android:name="android.permission.SET_WALLPAPER"/>