QMUIViewHelper.java 文件源码

/**
 * <p>对 View 做透明度变化的进场动画。</p>
 * <p>相关方法 {@link #fadeOut(View, int, Animation.AnimationListener, boolean)}</p>
 *
 * @param view            做动画的 View
 * @param duration        动画时长(毫秒)
 * @param listener        动画回调
 * @param isNeedAnimation 是否需要动画
 */
public static AlphaAnimation fadeIn(View view, int duration, Animation.AnimationListener listener, boolean isNeedAnimation) {
    if (view == null) {
        return null;
    }
    if (isNeedAnimation) {
        view.setVisibility(View.VISIBLE);
        AlphaAnimation alpha = new AlphaAnimation(0, 1);
        alpha.setInterpolator(new DecelerateInterpolator());
        alpha.setDuration(duration);
        alpha.setFillAfter(true);
        if (listener != null) {
            alpha.setAnimationListener(listener);
        }
        view.startAnimation(alpha);
        return alpha;
    } else {
        view.setAlpha(1);
        view.setVisibility(View.VISIBLE);
        return null;
    }
}