Android11 屏幕录制时代码去掉悬浮窗的录制

在Android 11中进行屏幕录制时，可以通过以下代码片段去除悬浮窗的录制：

MediaProjectionManager mediaProjectionManager = (MediaProjectionManager) getSystemService(Context.MEDIA_PROJECTION_SERVICE);
Intent permissionIntent = mediaProjectionManager.createScreenCaptureIntent();
startActivityForResult(permissionIntent, REQUEST_CODE_SCREEN_CAPTURE);

MediaRecorder mediaRecorder = new MediaRecorder();
mediaRecorder.setVideoSource(MediaRecorder.VideoSource.SURFACE);
mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
mediaRecorder.setVideoEncoder(MediaRecorder.VideoEncoder.H264);
mediaRecorder.setVideoSize(DISPLAY_WIDTH, DISPLAY_HEIGHT);
mediaRecorder.setVideoFrameRate(30);
mediaRecorder.setOutputFile(Environment.getExternalStorageDirectory() + "/video.mp4");

try {
    mediaRecorder.prepare();
} catch (IllegalStateException | IOException e) {
    e.printStackTrace();
}

VirtualDisplay virtualDisplay = mediaProjection.createVirtualDisplay("ScreenCapture",
        DISPLAY_WIDTH, DISPLAY_HEIGHT, screenDensity, DisplayManager.VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR,
        mediaRecorder.getSurface(), null, null);

mediaRecorder.start();

具体来说，需要将 `VirtualDisplay` 的 `flags` 参数设置为 `VIRTUAL_DISPLAY_FLAG_AUTO_MIRROR`，这样可以在录制时隐藏悬浮窗。