通过47degree SwipeListView：编程刷卡第一项： [英] SwipeListView by 47degree: swipe first item programmatically:

问题描述

我想刷卡上在 SwipeListView 中的第一项活动启动以表明 SwipeListView 是滑动展示给用户。

I would like to swipe the first item on the SwipeListView on Activity start up to show the user that the SwipeListView is swipe-able.

我如何使用该UI元素编程方式执行此操作？

How can I perform this action programmatically with this UI element?

更新：

我试图用

swipeListView.openAnimate(position)

这是在这里提出的答案，但即使我用数据填充项适配器...当我调试，并达到这个code节swipeListView不会看到它的项目，由于某种原因失败 NullPointerException异常。

that was proposed here in the answer, but for some reason even after I populate the adapter with data-items... when I debug and reach this code section the swipeListView doesn't see item in it, and fails with NullPointerException.

UPDATE2：好吧，我意识到有在适配器没有项目，因为它尚未的onCreate 创建的，让我感动的原因这code至方法：

UPDATE2: Well, I realized that the reason there were no items in the adapter because it's not yet created in onCreate, so I moved this code to method:

public void onWindowFocusChanged(boolean hasFocus){}

我的活动，现在它运行，但仍然无法在 SwipeListView 库的方法如下：

 private void resetCell() {
    if (downPosition != ListView.INVALID_POSITION) {
        if (swipeCurrentAction == SwipeListView.SWIPE_ACTION_CHOICE) {
            backView.setVisibility(View.VISIBLE);
        }
        frontView.setClickable(opened.get(downPosition));
        frontView.setLongClickable(opened.get(downPosition));
        frontView = null;
        backView = null;
        downPosition = ListView.INVALID_POSITION;
    }
}

这样做的原因是，当这种方法运行前视图对象从不设置以及它为空，也有人遇到过这个问题？

The reason for this is that when this method is running the frontView object is never set and those it null, have some one encountered this error?

先谢谢了。

推荐答案

其实我已经去了，重新在库中使用的动画只是为了展示的实例，所以我所做的是：

I have actually went and recreated the used animation in the library just for the instance of the Showcase, so what I did was:

private void generateRevealAnimate(final View view) {
    animate(view)
    .translationX(-520)
    .setDuration(500)
    .setListener(new AnimatorListenerAdapter() {
        @Override
        public void onAnimationEnd(Animator animation) {}
    }); 
}

private void generateCloseAnimate(final View view) {
    animate(view)
    .translationX(0)
    .setDuration(500)
    .setListener(new AnimatorListenerAdapter() {
        @Override
        public void onAnimationEnd(Animator animation) {}
    });
}

然后只需运行它们一个接一个的所需的视图：

And then just run them one after another on the desired view:

final Handler handler = new Handler();
handler.postDelayed(new Runnable() {
    @Override
    public void run() 
    {
        generateRevealAnimate(firstFrontView); 
        handler.postDelayed(new Runnable() {
            @Override
            public void run()
            {
                generateCloseAnimate(firstFrontView);  
            }
        }, 1400);
    }
}, 1400);                 

这篇关于通过47degree SwipeListView：编程刷卡第一项：的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！