如何显示在 VirtualDisplay 中打开的最后一个活动？

问题描述

我创建了一个虚拟显示器并在其中打开了设置。如果我在设置中打开了一些其他活动，例如：wifi 页面。然后我按下主页按钮并返回上次打开的活动应该在虚拟显示器中。

现在，它即将到来的空白页。请指导在已创建的虚拟显示中检索上次打开的活动。

public class MainActivity extends AppCompatActivity {

 private static final String TAG = "Test";
    private static final int SCREEN_CAPTURE_PERMISSION_CODE = 1;
    private int mWidth;
    private int mHeight;
    private displayMetrics mMetrics = new displayMetrics();
    private displayManager mdisplayManager;
    private Virtualdisplay mVirtualdisplay;
    private int mdisplayId;
    private mediaprojectionmanager mProjectionManager;
    private MediaProjection mProjection = null;
    private int mResultCode;
    private Intent mResultData;
    private SurfaceView mSurfaceView;
    private Surface mSurface;
    private display display;
    int inputSource = InputDevice.soURCE_UNKNowN;
    private Button mButtonA;
    
    
@Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Log.d(TAG2,"onCreate");
        setContentView(R.layout.activity_main);
    }

@Override
protected void onStart() {
        super.onStart();
        Log.d(TAG2,"onStart");
        mSurfaceView = findViewById(R.id.surfaceView);
        mSurface = mSurfaceView.getHolder().getSurface();
        mWidth = mSurfaceView.getLayoutParams().width;
        mHeight = mSurfaceView.getLayoutParams().height;
        mButtonA = findViewById(R.id.mButtonA);
        mdisplayManager = (displayManager) getSystemService(Context.disPLAY_SERVICE);
        mProjectionManager = (mediaprojectionmanager) getSystemService(Context.MEDIA_PROJECTION_SERVICE);

        
  /* Just after virtual display is created*/
        mSurfaceView.setonTouchListener((v,event) -> {
            inputSource = getSource(inputSource,InputDevice.soURCE_TOUCHSCREEN);
            injectMotionEvent(/*InputDevice.soURCE_TOUCHSCREEN*/ 
             inputSource,event.getAction(),event.getDownTime(),event.getEventTime(),event.getX(),event.getY(),event.getPressure(),mdisplayId);

            return true;
        });

  if(mResultData == null){
        Log.d(TAG,"inside mResultdata null");
      startActivityForResult(mProjectionManager.createScreenCaptureIntent(),SCREEN_CAPTURE_PERMISSION_CODE);

    }else {
        Log.d(TAG,"mVirtualdisplay.getdisplay" + mVirtualdisplay.getdisplay());
        Log.d(TAG,"mVirtualdisplay.getSurface" + mVirtualdisplay.getSurface());
        Log.d(TAG,"mvirtualdisplay.getdeviceid" + mVirtualdisplay.getdisplay().getdisplayId());
        Log.d(TAG,"mSurface in else onstart:" + mSurface);
        mVirtualdisplay.setSurface(mSurface);
        mdisplayId = mVirtualdisplay.getdisplay().getdisplayId();
        ActivityOptions options = ActivityOptions.makeBasic().setlaunchdisplayId(mdisplayId);
        Intent intent = getPackageManager().getLaunchIntentForPackage("com.android.settings");
        startActivity(intent,options.toBundle());
        Log.d(TAG,"inside mResultData not null");
    }



}

@Override
    protected void onResume() {
    super.onResume();
    Log.d(TAG,"onResume");
}

    @Override
    protected void onPause() {
        super.onPause();
        Log.d(TAG,"onpause");
    }

    @Override
    protected void onStop() {
        super.onStop();
        Log.d(TAG,"onStop");
    }

@Override
    protected void onDestroy() {
        super.onDestroy();
        Log.d(TAG,"onDestroy");
        if (mProjection != null) {
           Log.i(TAG,"Stop media projection");
            mProjection.stop();
            mProjection = null;
            destroyVirtualdisplay();
        }
         
    }
    

 private void createVirtualdisplay() {
            if (mProjection != null) {
            Log.d(TAG,"createVirtualdisplay WxH (px): " + mWidth + "x" + mHeight + ",dpi: " + mMetrics.densityDpi);
            String mVirtualdisplayTag = "TestVirtualdisplay";
            WindowManager wm = (WindowManager) getSystemService(Context.WINDOW_SERVICE);
                display = wm.getDefaultdisplay();
                display.getMetrics(mMetrics);

            mVirtualdisplay = mProjection.createVirtualdisplay(mVirtualdisplayTag,mWidth,mHeight,mMetrics.densityDpi,mSurface,null,null);
            mVirtualdisplay.setSurface(mSurface);
            Log.d(TAG,"mVirtualdisplaygetsurface in createvirtualdisplay" + mVirtualdisplay.getSurface());
            mdisplayId = mVirtualdisplay.getdisplay().getdisplayId();
            ActivityOptions options = ActivityOptions.makeBasic().setlaunchdisplayId(mdisplayId);
               Intent intent = getPackageManager().getLaunchIntentForPackage("com.android.settings");
            if(intent != null) {
                Log.d(TAG2," inside intent is not null");
                startActivity(intent,options.toBundle());
            }
            else {
                Log.e(TAG2,"Can't start activity,since launch intent null");
            }

        }
    }


     @Override
    public void onActivityResult(int requestCode,int resultCode,Intent data) {
        super.onActivityResult(requestCode,resultCode,data);
        mResultCode = resultCode;
        mResultData = data;
        if (mProjection ==  null){
            mProjection = mProjectionManager.getMediaProjection(mResultCode,mResultData);
        }
       createVirtualdisplay();
    }


    private void destroyVirtualdisplay() {
        Log.d(TAG,"destroyVirtualdisplay");
        if (mVirtualdisplay != null) {
            Log.d(TAG,"destroyVirtualdisplay release");
            mVirtualdisplay.release();
            mVirtualdisplay = null;
        }
    }

解决方法

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