ScreenshotActivity

ScreenshotActivity.java

    @Override
    public void onWindowFocusChanged(boolean hasFocus) {
        super.onWindowFocusChanged(hasFocus);
        View rootView = findViewById(R.id.root);
        rootView.setDrawingCacheEnabled(true);
        Bitmap b = rootView.getDrawingCache();
        try {
            b.compress(Bitmap.CompressFormat.PNG, 95, new FileOutputStream("/sdcard/screen.png"));
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        }
    }