Question

我正在使用android MediaProjection来截取屏幕截图。在截屏后需要停止投影，virtual display应该被释放，但VirtualDisplay.release()没有释放显示。这是创建显示的代码。

startActivityForResult(mProjectionManager.createScreenCaptureIntent(), REQUEST_CODE);

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    if (requestCode == REQUEST_CODE) {

        sMediaProjection = mProjectionManager.getMediaProjection(resultCode, data);

        // display metrics
        DisplayMetrics metrics = getResources().getDisplayMetrics();
        mDensity = metrics.densityDpi;
        mDisplay = getWindowManager().getDefaultDisplay();
        Point size = new Point();
        mDisplay.getSize(size);
        mWidth = size.x;
        mHeight = size.y;

        // register media projection stop callback
        sMediaProjection.registerCallback(new MediaProjectionStopCallback(), mHandler);

        // register orientation change callback
        mOrientationChangeCallback = new OrientationChangeCallback(this);
        if (mOrientationChangeCallback.canDetectOrientation()) {
            mOrientationChangeCallback.enable();
        }


        // start capture reader
        mImageReader = ImageReader.newInstance(mWidth, mHeight, PixelFormat.RGBA_8888, 1);
        mVirtualDisplay = sMediaProjection.createVirtualDisplay(SCREENCAP_NAME, mWidth, mHeight, mDensity, VIRTUAL_DISPLAY_FLAGS, mImageReader.getSurface(), null, mHandler);
        mImageReader.setOnImageAvailableListener(new ImageAvailableListener(), mHandler);
    }
}

要停止投影，我致电sMediaProjection.stop();，这是MediaProjectionStopCallback实施。

private class MediaProjectionStopCallback extends MediaProjection.Callback {
    @Override
    public void onStop() {
        Log.e("ScreenCapture", "stopping projection.");
        mHandler.post(new Runnable() {
            @Override
                public void run() {
                if (mVirtualDisplay != null) {
                    mVirtualDisplay.release();
                    Log.e("Virtual Display", "Released");
                }
                if (mImageReader != null)
                    mImageReader.setOnImageAvailableListener(null, null);    
                if (mOrientationChangeCallback != null)
                    mOrientationChangeCallback.disable();
                sMediaProjection.unregisterCallback(MediaProjectionStopCallback.this);

                DisplayManager disp = (DisplayManager) getSystemService(DISPLAY_SERVICE);
                Display[] allDisplays = disp.getDisplays(DisplayManager.DISPLAY_CATEGORY_PRESENTATION);
                Log.e(TAG + "-Display", "Display Count  " + allDisplays.length);
                for (Display dl : allDisplays) {
                    Log.e(TAG + "-Display", "Display name: " + dl.getName() + " Display id: " + dl.getDisplayId());
                }
            }
        });

        //Toast.makeText(getApplicationContext(), "Projection Stopped", Toast.LENGTH_SHORT).show();
    }
}

这是logcat。

03-02 14:52:55.925    8264-8732/codistan.pk.squeeze_me E/ScreenCapture﹕ stopping projection.
03-02 14:52:55.925    8264-8732/codistan.pk.squeeze_me E/Virtual Display﹕ Released
03-02 14:52:55.925    8264-8732/codistan.pk.squeeze_me E/codistan.pk.squeeze_me.ScreenCaptureActivity-Display﹕ Display Count  1
03-02 14:52:55.935    8264-8732/codistan.pk.squeeze_me E/codistan.pk.squeeze_me.ScreenCaptureActivity-Display﹕ Display name: screencap Display id: 1

我已经仔细检查过，上面的onStop方法被正确调用，可以在logcat中看到。当我检查可用显示时，在onStop中释放显示后，虚拟显示仍然列为可用显示。 It affects the phone display and graphics and I can't play any video and the issue remains even after uninstalling the app untill I restart the phone.我已查看此链接Android virtual display release does not remove display并进行了大量搜索但未发现任何有用的信息。非常感谢您的帮助。

Answer 1

试试这个？

2017-12-07T12:05:45Z

Android VirtualDisplay.release（）不释放显示

1 个答案: