Android笔记:根据进度代码改变progressbar背景颜色，ClipDrawable,LayerDrawable,setProgressDrawable

private void setProgressBg(int progress) {
int a = progress * 255 / 100;
int color = Color.argb(a, 255, 90, 147);
ColorDrawable colorDrawable = new ColorDrawable();
colorDrawable.setColor(color);
ClipDrawable clipDrawable = new ClipDrawable(colorDrawable, Gravity.LEFT, ClipDrawable.HORIZONTAL);

Drawable drawable = getResources().getDrawable(R.color.transparent);
Drawable[] layers = new Drawable[]{drawable,clipDrawable};
LayerDrawable layerDrawable = new LayerDrawable(layers);
layerDrawable.setDrawableByLayerId(0,drawable);
layerDrawable.setDrawableByLayerId(1,clipDrawable);
progressBar.setProgressDrawable(clipDrawable);

progressBar.setProgress(0);
progressBar.setProgress(progress);

Loger.d("Vote投票", "result = " + progress);
Loger.d("Vote投票", "a = " + a);
}