AndroidEspressoScreenshot

public class Screenshot {

    public static final String TAG = Screenshot.class.getSimpleName();

    public static void takeScreenshot(String name, Activity activity) {
        String testDirPath = Environment.getExternalStorageDirectory().getAbsolutePath() + "/test-screenshots";
        File testDir = new File(testDirPath);
        testDir.mkdirs();

        View scrView = activity.getWindow().getDecorView().getRootView();
        scrView.setDrawingCacheEnabled(true);
        Bitmap bitmap = Bitmap.createBitmap(scrView.getDrawingCache());
        scrView.setDrawingCacheEnabled(false);

        OutputStream out = null;
        File imageFile = new File(testDir, name + ".jpg");

        try {
            out = new FileOutputStream(imageFile);
            bitmap.compress(Bitmap.CompressFormat.JPEG, 90, out);
            out.flush();
        } catch (IOException e) {
            Log.e(TAG, "error taking screenshot", e);
        } finally {
            try {
                if (out != null) {
                    out.close();
                }
            } catch (Exception exc) {}
        }
    }
}