为什么 AppTheme.NoActionBar 不起作用? [英] Why is AppTheme.NoActionBar not working?

问题描述

我已经在 Android Studio 中创建了一个 Android 应用，它默认创建了这些样式:

I've created an Android app in Android Studio, and it has created these styles by default:

<style name="AppTheme.NoActionBar">
    <item name="windowActionBar">false</item>
    <item name="windowNoTitle">true</item>
</style>

但是，在一个活动中，我尝试将其设置为主题:

However, in an activity, I try to set this as a theme:

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
   ...
android:theme="@style/AppTheme.NoActionBar">

但是当我运行应用程序时，我得到了操作栏:

But when I run the app I'm getting the action bar:

为什么我会得到一个操作栏?是我做错了什么，还是 Android Studio(Google 为其自己平台的官方 IDE)试图混淆/误导其开发人员?

Why am I getting an action bar? Am I doing something obviously wrong, or is Android Studio, Google's official IDE for it's own platform, trying to confuse/mislead its developers?

这是我的活动代码，其中没有任何内容可以导致操作栏自行出现:

Here is my activity code, there's nothing in it that can cause the action bar to appear by itself:

public class WelcomeActivity extends AppCompatActivity {
    @Override
    public void onCreate(Bundle savedInstanceState, PersistableBundle persistentState) {
        super.onCreate(savedInstanceState, persistentState);
        setContentView(R.layout.activity_welcome);
    }
}

推荐答案

试试这个:

<style name="AppTheme.NoActionBar">
    <item name="windowNoTitle">true</item>
    <item name="windowActionBar">false</item>
    <item name="android:windowFullscreen">true</item>
    <item name="android:windowContentOverlay">@null</item>
  </style>

并将其设置为清单中活动的主题，即:

and set this as the theme of your activity in the manifest, that is:

<activity
    ...
    android:theme="@style/AppTheme.NoActionBar">
</activity>

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