Take a screenshot of a video in a webview android

I am working on a project where I save a screenshot in a WebView. API Level is 21. On a normal homepage it works absolutely fine, but when I visit youtube and watch a video, the video player returns as a black rectangle. What I want to do is take a screenshot whenever the user touches the screen.

When I take a screenshot with Power & Volume Button it works perfectly. Is there an Intent which takes this kind of a screenshot? Ideally the screenshot would only contain the webview, but if it's the entire screen I can work with that too.

Any help is greatly appreciated.

Cheers,

Toby

Edit: some of my code

View rootView;
ValueCallback<String> callback = new ValueCallback<String>() {
    @Override
    public void onReceiveValue(String value) {
        category1.setText(value);
    }
};
String root = android.os.Environment.getExternalStoragePublicDirectory
        (Environment.DIRECTORY_DCIM).toString(), filename, time, puretime, movementType = ""; //movementType is set according to MotionEvent.getAction()
File myDir = new File(root + "/saved_files/")

protected void onCreate(Bundle savedInstanceState) {
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    super.onCreate(savedInstanceState);

    rootView = findViewById(android.R.id.content).getRootView();
    rootView.setDrawingCacheEnabled(true);
}

public class MyView extends View {
    public MyView(Context context) {
        super(context);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        calendar = Calendar.getInstance();
        time = String.format("%02d:%02d:%02d.%03d", calendar.get(Calendar.HOUR_OF_DAY),
                calendar.get(Calendar.MINUTE), calendar.get(Calendar.SECOND),
                calendar.get(Calendar.MILLISECOND));
        puretime = String.format("%02d%02d%02d%03d", calendar.get(Calendar.HOUR_OF_DAY),
                calendar.get(Calendar.MINUTE), calendar.get(Calendar.SECOND),
                calendar.get(Calendar.MILLISECOND));
        if (movementType.equals("down")) {
            try {
                filename = puretime + ".xml";
                webView.saveWebArchive(myDir+filename, false, callback);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        invalidate();
        return true;
    }

edit2:

apparently the problem for the black rectangles is that elements as the video are processed by the gpu and for a "normal" snapshot to work the program would need to calculate every frame which is too much work.

I think this will help

  View rootView = findViewById(android.R.id.content).getRootView();
  rootView.setDrawingCacheEnabled(true);
  Bitmap screenshot = rootView.getDrawingCache();

Let me know once you try.

UPDATE:

If I have understood your comment correctly, you were not able to change path with saveWebArchive(filename).

Then you might want to use saveWebArchive(String,boolean,ValueCallback<String> callBack). This will save file with the given name and you can use that file name in the callback function to do whatever you want to (like saving to external storage or anything).

Check here - saveWebArchive