带后退箭头的操作栏 [英] Action bar with back arrow

问题描述

我正在制作一个应用，我想在片段中放置一个带有后退箭头的操作栏.
因此，我已经有了带有操作栏的片段，但是不知道如何在其上放置后退箭头.你能帮我吗?
谢谢
吉列尔梅
这是带有操作栏标签的片段

I am making an app and I want to put an action bar with a back arrow in a fragment.
So, I already have the fragment with the action bar but don't know how to put the back arrow on it. Can you help me please?
Thank you,
Guilherme
This is the fragment with an action bar tag

推荐答案

如果要显示片段中的后退按钮，请在片段中添加以下行:(((AppCompatActivity)getActivity()).getSupportActionBar().setDisplayHomeAsUpEnabled(true);

Add following line in your fragment if you want to show the back button from the fragment : ((AppCompatActivity)getActivity()).getSupportActionBar().setDisplayHomeAsUpEnabled(true);

这样做会更好.您将活动的父级添加到清单文件中，以确保按下向后箭头时可以打开父级活动.

It would be better that along with doing this. You add the parent of the activity in the manifest file to make sure that parent activity is opened when back arrow is pressed.

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