Util.java 文件源码

public void setCircleButtonStateListDrawable(View circleButton, int radius,int color) {
    WeakReference<Bitmap> imageNormal = new WeakReference<>(Bitmap.createBitmap(2 * radius, 2 * radius, Bitmap.Config.ARGB_8888));
    Canvas canvasNormal = new Canvas(imageNormal.get());
    Paint paintNormal = new Paint();
    paintNormal.setAntiAlias(true);
    paintNormal.setColor(color);
    canvasNormal.drawCircle(radius, radius, radius, paintNormal);
    StateListDrawable stateListDrawable = new StateListDrawable();
    stateListDrawable.addState(StateSet.WILD_CARD, new BitmapDrawable(circleButton.getContext().getResources(), imageNormal.get()));
    if (android.os.Build.VERSION.SDK_INT >= 16) {
        circleButton.setBackground(stateListDrawable);
    } else {
        circleButton.setBackgroundDrawable(stateListDrawable);
    }

}