Android的Activity.onWindowFocusChanged不会从内TabHost称为 [英] Android Activity.onWindowFocusChanged doesn't get called from within TabHost

问题描述

我挣扎了.onWindowFocusChanged（）不会被调用在我的自定义Activity类的问题。我的设置：

I'm struggling with the problem that the .onWindowFocusChanged() doesn't get called in my custom Activity class. My setup:

两个选项卡（含Activity_1和Activity_2）在TabHost，其中第2个选项卡默认情况下选择：

Two tabs (containing Activity_1 and Activity_2) in a TabHost, where the 2nd tab is selected by default:

tabHost.setCurrentTab(currentTabIndex);

在这两项活动中，我添加了onWindowFocusChanged（）重写（因为我需要preform计算布局完成图纸后）：

In both Activities, I added the onWindowFocusChanged() override (because I need to preform calculations after the layout is done drawing):

@Override
public void onWindowFocusChanged(boolean hasFocus)
{
    super.onWindowFocusChanged(hasFocus);
}

问题：当第2个选项卡默认选中，而我点击第一个选项卡中，onWindowFocusChanged（）不会被调用内Activity_1（与第1选项卡关联）。 这两项活动延长正常活动类。

The problem: when the 2nd tab is selected by default, and I click the 1st tab, the onWindowFocusChanged() never gets called within Activity_1 (associated with the 1st tab). Both Activities extend the normal Activity class.

在如何解决这一问题的任何线索将大大AP preciated！

Any clue on how to fix this would be greatly appreciated!

推荐答案

如果您需要等到特定的视图是画，然后进行计算，可以使用viewTreeObserver听布局的变化，让你的计算存在。 使用这样的：

If you need to wait until a specific View is draw and then make the calculations, you could use viewTreeObserver to listen the layout changes and make your calculations there. Use it like this:

ViewTreeObserver vto = mainLayout.getViewTreeObserver();
vto.addOnGlobalLayoutListener(new OnGlobalLayoutListener() {
public void onGlobalLayout() {
    // remove the listener so it won't get called again if the view layout changes
    mainLayout.getViewTreeObserver().removeOnGlobalLayoutListener(this);
    // add your calculations here
}}

我希望这是你想要的。

I hope this is what you want..

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