BaseAdapterHelper.java 文件源码

/**
 * Add an action to set the alpha of a view. Can be called multiple times.
 * Alpha between 0-1.
 * 设置控件的显示的透明度
 */
public BaseAdapterHelper setAlpha(int viewId, float value) {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB) {
        retrieveView(viewId).setAlpha(value);
    } else {
        // Pre-honeycomb hack to set Alpha value
        AlphaAnimation alpha = new AlphaAnimation(value, value);
        alpha.setDuration(0);
        alpha.setFillAfter(true);
        retrieveView(viewId).startAnimation(alpha);
    }
    return this;
}