LongClickListener和設置手機桌面

     長按圖片可設置圖片爲桌面，需要用戶權限 uses-permission android:name="android.permission.SET_WALLPAPER"

設置桌面的三個方法  cLearWallpaper()  清空原有桌面 、setWallpaper(Bitmap bitmap) 通過bitmap設置手機屏幕、setWallpaper(InputStream data ) 通過輸入流設置手機屏幕、Drawable getWallpaper() 取得當前的手機屏幕信息。長按圖片設置手機屏幕代碼如下：

  activity_main.xml   

       <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"
    tools:context=".MainActivity" >


    <TextView
        android:id="@+id/info"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="長按圖片可以設置桌面" />
    <ImageView 
        android:id="@+id/img"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:src="@drawable/rabbit"/>


</LinearLayout>

   MainActivity.java

package com.jackie.longclickproject;


import java.io.IOException;


import android.app.Activity;
import android.content.res.Resources.NotFoundException;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.View.OnLongClickListener;
import android.widget.ImageView;
import android.widget.TextView;


public class MainActivity extends Activity {

    private TextView info=null;
    private ImageView img=null;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
super.setContentView(R.layout.activity_main);

this.info=(TextView)super.findViewById(R.id.info);
this.img=(ImageView)super.findViewById(R.id.img);
this.img.setOnLongClickListener(new OnLongClickListenerImpl());
}


private class OnLongClickListenerImpl implements OnLongClickListener{


@Override
public boolean onLongClick(View arg0) {

try {
MainActivity.this.clearWallpaper();
MainActivity.this.setWallpaper(MainActivity.this.getResources().openRawResource(R.drawable.rabbit));
  MainActivity.this.info.setText("手機桌面背景已修改");
} catch (Exception e) {
// TODO Auto-generated catch block
MainActivity.this.info.setText("手機桌面背景設置失敗");
e.printStackTrace();

}
return false;
}}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}


}

用戶授權

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.jackie.longclickproject"
    android:versionCode="1"
    android:versionName="1.0" >


    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="17" />


    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.jackie.longclickproject.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />


                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>
 <uses-permission android:name="android.permission.SET_WALLPAPER"/>
</manifest>