ColorStateDrawable.java 文件源码

@Override
protected boolean onStateChange(int[] states) {
    boolean pressedOrFocused = false;
    for (int state : states) {
        if (state == android.R.attr.state_pressed || state == android.R.attr.state_focused) {
            pressedOrFocused = true;
            break;
        }
    }

    if (pressedOrFocused) {
        super.setColorFilter(getPressedColor(mColor), PorterDuff.Mode.SRC_ATOP);
    } else {
        super.setColorFilter(mColor, PorterDuff.Mode.SRC_ATOP);
    }

    return super.onStateChange(states);
}