private void applyLeftMargin(int margin, View... targetViews) {
        for (View view : targetViews) {
            final LinearLayout.LayoutParams params = (LinearLayout.LayoutParams) view.getLayoutParams();
            params.setMargins(margin, params.topMargin, params.rightMargin, params.bottomMargin);
            view.setLayoutParams(params);
        }
    }
Sets the padding to be used for the number pad buttons.

@param padding padding in pixels
android/third_party/time-duration-picker/src/main/java/mobi/upod/timedurationpicker/TimeDurationPicker.java