Android通过长按图片设置为壁纸

 用imageview控件为他添加长按事件；
 imageview.setOnLongClickListener(new OnLongClickListener(){
             public boolean onLongClick(View v)
             {
                 try {
                     //MainActivity是当前的activity
                     MainActivity.this.clearWallpaper();//清楚墙纸
                     MainActivity.this.setWallpaper(getResources().openRawResource(R.drawable.b));//设置新的墙纸
                     tost();
                 }
                 catch (Exception e) {
                     e.printStackTrace();
                 }
                 return true;
             }
         });
 2.在mainfest.xml文件中添加注册权限
18 <uses-permission android:name="android.permission.SET_WALLPAPER"/>