拍摄Android当前视图的屏幕截图

Question

I'm very new to Android. And I have created a system overlay (similar to Facebook chat heads). Now I want to take the screen shot of the current view (where the system overlay is present) progrmatically. System overlay can be in top of any activity, my goal is get the screenshot of any activity.

Is it possible to do so?

Thanks in advance.

Answer 1

Is it possible to do so?

No. You can't get a screenshot of any other app's Activity programmatically.

Answer 2

The only thing you can get from this is the overlay itself.
You can easily try it with this method, save the bitmap to storage, and then display it with your gallery app.
You will only see the overlay content, but nothing below.

    public static Bitmap createBitmapFromView(View v) {
        Bitmap bitmap = Bitmap.createBitmap(v.getWidth(), v.getHeight(), Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(bitmap);
        v.draw(canvas);
        return bitmap;
    }