屏幕方向更改后，Android片段以错误的顺序添加 [英] Android fragments added in wrong order after screen orientation change

问题描述

在片段过渡的自定义动画期间屏幕方向发生变化时，片段排序出现问题.

I am having a problem with fragment ordering when the screen orientation changes during a custom animation of my fragment transition.

如果我恰好在正确的时间旋转屏幕，则会在 MyFragment1 应该位于的位置添加 MyFragment2 片段.

If I rotate the screen at exactly the right time, the fragments are added with the MyFragment2 in the position where MyFragment1 should be.

我正在添加我的片段，如下所示:

I am adding my fragments as follows:

final FragmentManager fm = activity.get().getFragmentManager();
final FragmentTransaction ft = fm.beginTransaction();

ft.setCustomAnimations(
        R.animator.slide_in_left,
        R.animator.slide_out_top,
        R.animator.slide_in_bottom,
        R.animator.slide_out_right);

ft.replace(R.id.container,
        MyFragment1.newInstance(), MyFragment1.TAG);

ft.add(R.id.container,
        MyFragment2.newInstance(),MyFragment12.TAG)
        .addToBackStack(null)
        .commit();

我已经搜索了许多小时，以获取有关此问题的信息.我在 Android多片段交易订单(在这里 https://code.google.com/p/android/issues/detail?id=31116

I have been searching for many hours for information about this problem. I have seen information here Android multiple fragment transaction ordering, here https://code.google.com/p/android/issues/detail?id=69403&thanks=69403&ts=1399482444 and here https://code.google.com/p/android/issues/detail?id=31116

我的理解是，这是在活动的onResume()期间重新添加片段的错误.

My understanding is that this is a bug with re-adding fragments during onResume() of an activity.

如何防止我的活动在恢复活动时错误地排序我的片段?

How can I prevent my Activity from incorrectly ordering my fragments when it is resumed?

我的活动布局

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:gravity="center"
android:orientation="vertical"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity"
tools:ignore="MergeRootFrame" />

推荐答案

我遇到了同样的问题，以下解决方法有所帮助:

I had the same issue, the following workaround helped:

@Override
public void onResume() {
    super.onResume();

    bringToFrontIfNeeded();
}

@Override
public void onBackStackChanged() {
    bringToFrontIfNeeded();
}

private void bringToFrontIfNeeded() {
    // A fix for a weird google bug
    if (amIOnTop() && (getView() != null)) {
        getView().bringToFront();
    }
}

private void amIOnTop() {
    // depends on you app logic, can be something like
    FragmentManager manager = getFragmentManager();
    int count = manager.getBackStackEntryCount();
    return (BACK_STACK_ENTRY_NAME.equals(manager.getBackStackEntryAt(count - 1).getName()));

}

这篇关于屏幕方向更改后，Android片段以错误的顺序添加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！