的getWidth返回片段0，getPaddingLeft返回非零

问题描述

我想我的Andr​​oid应用转换成片段，支持多种屏幕尺寸，并正确使用新的ICS标签。 previously我使用了 onWindowFocusChanged（）方法和运行以下code在它的内部 - 基本上是这样做了我布置的一些动态格式被创建之后。

I am trying to convert my Android app to Fragments to support multiple screen sizes and to use the new ICS tabs correctly. Previously I used the onWindowFocusChanged() method and ran the following code inside of it - basically this did some dynamic formatting of my layout after it was created.

public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {

LinearLayout theLayout = (LinearLayout)inflater.inflate(R.layout.tab_frag2_layout, container, false);

getWidthEditButton = (ImageButton) theLayout.findViewById(R.id.buttonEditPoints);
buttonAddPointsManual = (ImageView) theLayout.findViewById(R.id.buttonAddPointsManual);

linearPointsUsed = (LinearLayout) theLayout.findViewById(R.id.linearLayoutPointsUsed);

int paddingLeftForTracker = linearPointsUsed.getPaddingLeft();
int paddingRightForTracker = getWidthEditButton.getWidth();

linearPointsUsed.setPadding(paddingLeftForTracker, 0, paddingRightForTracker, 0);
}

现在，我已经搬到片段和出于某种原因，我paddingRightForTracker返回0。我遇到了一个问题，previously我在那里试图让宽度太早，因此我的举动onWindowFocusChanged previously，但不提供给片段。奇怪的是，居然paddingLeftForTracker返回一个非零值。

Now that I have moved to Fragments and for some reason my paddingRightForTracker returns 0. I ran into an issue previously where I was trying to get width too early, hence my move to onWindowFocusChanged previously, but that is not available to Fragments. The strange thing is that paddingLeftForTracker actually returns a non-zero value.

如果我手动设置paddingRightForTracker，变化发生，所以我知道的code上。只是想不通，为什么我的getWidth将返回0。

If I set paddingRightForTracker manually, the change takes place so I know the code is running. Just can't figure out why my getWidth is returning 0.

任何帮助将大大AP preciated。

Any help would be greatly appreciated.

推荐答案

您可以尝试做它onActivityCreated（）。所以，你会保存到onCreateView这些观点的引用，然后访问他们onActivityCreated（）。我认为，当你试图访问它，这就是为什么它没有返回宽度的观点没有完成创建。

You could try doing it in onActivityCreated(). So, you would save a reference to those views in onCreateView, and then access them in onActivityCreated(). I think the view isn't completed created when you're trying to access it, which is why it returns no width.

http://developer.android.com/reference/android/app/Fragment.html#onActivityCreated(android.os.Bundle)

好了，我发现了另一种方式来获得的宽度。我也一样，不能得到对双方都onViewCreated，onCreateView，也不onResume一个按钮的宽度。我发现这一点，试了一下，它的返回值，所以也许它会为你工作！

Ok, so I found out about another way to get the width. I, too, cannot get a button width on neither onViewCreated, onCreateView, nor onResume. I found this, tried it, and it's returning a value, so maybe it'll work for you!

ViewTreeObserver vto = button.getViewTreeObserver();
    vto.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
        @Override
        public void onGlobalLayout() {
        width = button.getWidth();
        height = button.getHeight();
    }
});

仅供参考，我跑了onResume这个code，所以我不能完全肯定有什么地方它可以工作。

FYI, I ran this code in onResume, so I'm not exactly sure where else it could work.

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