Android学习之长按事件

桌面设置授权操作：

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

MyLongClickDemo.java:

import android.app.Activity;import android.os.Bundle;import android.view.View;import android.view.View.OnLongClickListener;import android.widget.ImageView;import android.widget.TextView;public class MyLongClickDemo extends Activity {private TextView info = null;private ImageView img = null;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);super.setContentView(R.layout.main);this.img = (ImageView) super.findViewById(R.id.img);this.info = (TextView) super.findViewById(R.id.info);this.img.setOnLongClickListener(new OnLongClickListenerImpl());}private class OnLongClickListenerImpl implements OnLongClickListener {public boolean onLongClick(View v) {try {MyLongClickDemo.this.clearWallpaper(); // 清除已有的桌面MyLongClickDemo.this.setWallpaper(MyLongClickDemo.this.img.getResources().openRawResource(R.drawable.mldn_bg)); // 设置桌面MyLongClickDemo.this.info.setText("手机桌面背景已修改。");} catch (Exception e) {e.printStackTrace() ;MyLongClickDemo.this.info.setText("手机桌面背景设置失败。");}return false;}}}

main.xml:

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:orientation="vertical" android:layout_width="fill_parent"android:layout_height="fill_parent"><TextView android:id="@+id/info"android:layout_width="fill_parent"android:layout_height="wrap_content" android:text="长按图片将设置为桌面背景" /><ImageViewandroid:id="@+id/img"android:layout_width="fill_parent"android:layout_height="fill_parent"android:src="@drawable/mldn_bg"/> </LinearLayout>

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