替换片段时，Android fitsSystemWindows无法正常工作 [英] Android fitsSystemWindows not working when replacing fragments

问题描述

我有SingleFramgnetActivity，其目的只是保留和替换其中的片段.

I have SingleFramgnetActivity whose purpose is only to hold and replace fragments inside it.

布局看起来像这样:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:gravity="center_horizontal"
    android:orientation="vertical"
    tools:context=".SingleFragmentActivity"
    >

    <include layout="@layout/toolbar"/>

    <FrameLayout
        android:id="@+id/content"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        />
</LinearLayout>

我要替换FrameLayout中的Fragments.当我在Fragment布局上将fitsSystemWindows设置为true时，它没有响应.实际上，它仅在创建Activity时有效，但是一旦我替换了FrameLayout内的Fragment，则fitsSystemWindows参数将被忽略，并且布局位于状态栏和导航栏下方.

I'm replacing the Fragments inside the FrameLayout. When I set the fitsSystemWindows to true on the Fragment layout, it is not responding. Actually it is working only when Activity is created, but once I replace the Fragment inside the FrameLayout, the fitsSystemWindows parameter is ignored and the layout is below the status bar and navigation bar.

我找到了一些解决方案，其中包含自定义FrameLayout使用不推荐使用的方法，但是由于某种原因，它对我不起作用(与普通FrameLayout的结果相同)，而且我也不喜欢使用不推荐使用的方法的想法.

I found some solution with custom FrameLayout which is using deprecated methods, but for some reason it is not working for me (same result as with normal FrameLayout) and I also do not like the idea to use deprecated methods.

推荐答案

您的FrameLayout不知道窗口插入大小，因为它是父级-LinearLayout尚未分派他.解决方法是，您可以将LinearLayout子类化，然后将插图自行传递给子代:

Your FrameLayout is not aware of window inset sizes, because it's parent - LinearLayout hasn't dispatched him any. As a workaround, you can subclass LinearLayout and pass insets to children on your own:

@TargetApi(Build.VERSION_CODES.KITKAT_WATCH)
@Override
public WindowInsets onApplyWindowInsets(WindowInsets insets) {
    int childCount = getChildCount();
    for (int index = 0; index < childCount; index++)
        getChildAt(index).dispatchApplyWindowInsets(insets); // let children know about WindowInsets

    return insets;
}

您可以查看我的答案，它将详细说明其工作原理以及使用方法 ViewCompat.setOnApplyWindowInsetsListener API.

You can have a look to my this answer, which will explain detailed how this works, and also how to use ViewCompat.setOnApplyWindowInsetsListener API.

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