MPCharts - Line Chart (gradient fill) is not working in API Level 16

Question

im using line chart (MPCharts) gradient fill working perfectly with API Level 19 but not in API Level 16 (and bellow i guess). is it a bug or do i have to try in different manner?

Thanks.

I used These codes.

LineDataSet set1 = new LineDataSet(yVals, "Close");
Drawable drawable = ContextCompat.getDrawable(getApplication(),R.drawable.gradiant);
                drawable.setAlpha(200);
                set1.setFillDrawable(drawable);
                set1.setDrawFilled(true);

Screen Shots,

Answer 1

set1.setDrawFilled(true);
if (Utils.getSDKInt() >= 18) {
    // fill drawable only supported on api level 18 and above
    Drawable drawable = ContextCompat.getDrawable(this, R.drawable.gradiant);
    set1.setFillDrawable(drawable);
}
else {
    set1.setFillColor(Color.BLACK);
}