Android 中的图库自动滚动问题

发布于 2024-12-11 23:29:30 字数 522 浏览 0 评论 0原文

我已经使用 Gallery View 一段时间了，并且已经启动并运行了基本的东西。但是，我在滚动时遇到问题。我尝试在谷歌中搜索，但没有找到解决此问题的简单方法。我正在使用基本适配器加载图像，完成后，我需要移动到特定位置（读取自动滚动）。我面临的问题是，假设我在图库中加载了 50 张图像，并且我想移动到第 30 个位置，我只需要调用 gallery.setSelection(30) 就可以了。仅当通过单击按钮调用时才有效。但是，我希望对活动负载本身执行相同的操作。一旦我将 BaseAdapter 与库绑定，我就无法知道绑定何时完成。我将不胜感激任何帮助。这就是我绑定适配器的方式。

        gallery = (Gallery) findViewById(R.id.wpGallery);
    ImageAdapter imgAdapter = new ImageAdapter(this);
    gallery.setAdapter(imgAdapter);

我想移动到给定位置，并在移动到该位置后触发 onClickEvent。

原文

I have been playing with Gallery View for sometime now and I have the basic stuff up and running. However, I have a problem with scrolling. I have tried to search in google and did not get a simple solution to this problem. I am loading images using a Base Adapter and once done, I need to move to a particular position(read auto scroll). The problem that I am facing is that, let's say I have 50 images loaded in the gallery and I want to move to the 30th position, I would just need to call gallery.setSelection(30) and I should be done. This works only when called from a button click. However, I want the same to be done on the activity load itself. Once I bind the the BaseAdapter with the gallery, I am not able to find out when exactly the binding is completed. I would appreciate any help on this. This is how I am binding the adapter.

        gallery = (Gallery) findViewById(R.id.wpGallery);
    ImageAdapter imgAdapter = new ImageAdapter(this);
    gallery.setAdapter(imgAdapter);

I want to move to the given position and also trigger the onClickEvent once it has moved to that position.

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无人问我粥可暖 2024-12-18 23:29:30

我不确定这是否有效。但值得一试。

将此代码放在 onCreate 中，

ViewTreeObserver vto = gallery.getViewTreeObserver();
vto.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
    @Override
    public void onGlobalLayout() {
        gallery.getViewTreeObserver().removeGlobalOnLayoutListener(this);
        DO WHATEVER YOU NEED TO DO.

    }
});

在视图组在屏幕上布局后调用 OnGlobalLayoutListener。您应该可以在这里执行 setSelection 。

I'm not sure if this will work. But its worth a try.

Put this code in onCreate

ViewTreeObserver vto = gallery.getViewTreeObserver();
vto.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
    @Override
    public void onGlobalLayout() {
        gallery.getViewTreeObserver().removeGlobalOnLayoutListener(this);
        DO WHATEVER YOU NEED TO DO.

    }
});

OnGlobalLayoutListener is called after the viewgroup is laid out on the screen. You should be able to do setSelection here.

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