android - 如何显示在 VirtualDisplay 中打开的最后一个活动？

Question

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最后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, 0, 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;
        }
    }