Android开发：实现系统自带截屏功能 需要获取System权限

在一个service界面上，点击一个button按钮，可以截屏

贴上代码：

mButton.setOnClickListener(new OnClickListener(){

         public void onClick(View arg0) {

          capturescreen();

         }

         });

private void captureScreen ()

{

mHandler.postDelayed(mScreenshotChordLongPress,1000);

}

private final Runnable mScreenshotChordLongPress = new Runnable() {      

  public void run() {

   takeScreenshot();       

  }

  };

  

  final Runnable mScreenshotTimeout = new Runnable() {

   public void run() {

    synchronized (mScreenshotLock) {

     if (mScreenshotConnection != null) {

      mContext.unbindService(mScreenshotConnection);                   

            mScreenshotConnection = null;

            }

     }

    }

   };

   

 private void takeScreenshot() {

  synchronized (mScreenshotLock) {

   if (mScreenshotConnection != null) {

                   return;

                   }

   

   ComponentName cn = new ComponentName("com.android.systemui",

                       "com.android.systemui.screenshot.TakeScreenshotService");

   Intent intent = new Intent();

   intent.setComponent(cn);

   ServiceConnection conn = new ServiceConnection() {

    public void onServiceConnected(ComponentName name, IBinder service) {

     synchronized (mScreenshotLock) {

      if (mScreenshotConnection != this) {

                               return;

                               }

      Messenger messenger = new Messenger(service);

               Message msg = Message.obtain(null, 1);

               final ServiceConnection myConn = this;

               Handler h = new Handler(mHandler.getLooper()) {

                               @Override

                               public void handleMessage(Message msg) {

                                   synchronized (mScreenshotLock) {

                                       if (mScreenshotConnection == myConn) {

                                           mContext.unbindService(mScreenshotConnection);

                                           mScreenshotConnection = null;

                                           mHandler.removeCallbacks(mScreenshotTimeout);

                                       }

                                   }

                               }

                           };

                           msg.replyTo = new Messenger(h);

                           msg.arg1 = msg.arg2 = 0;

//                           if (mStatusBar != null && mStatusBar.isVisibleLw())

                            //   msg.arg1 = 1;

//                           if (mNavigationBar != null && mNavigationBar.isVisibleLw())

                             //  msg.arg2 = 1;

                           try {

                               messenger.send(msg);

                           } catch (RemoteException e) {

                           }

                       }

                   }

                   public void onServiceDisconnected(ComponentName name) {}

               };

            

               if (mContext.bindService(intent, conn, Context.BIND_AUTO_CREATE)) {               

                   mScreenshotConnection = conn;               

                   mHandler.postDelayed(mScreenshotTimeout, 10000);           

                   }      

           }

       }

 

点击button之后会停运，因为调用系统截屏的serivce:com.android.systemui.screenshot.TakeScreenshotService

要调用此service需要sysytem权限才能调用：

唯有将此应用内置到手机里面，才能获取到sysytem权限：

做法如下：

1.在你自己的程序当中的的mainfest.xml的manifest加上此属性android:sharedUserId="android.uid.system"

2.内置的时候Android.mk中加上LOCAL_CERTIFICATE := PLATFORM

3.在linux环境下将此应用编译进去。这样就能够实现系统自带的截屏了