这些答案大部分似乎都过时了。Developer.android.com建议这样做:

科特林：

private fun hideSystemBars() {
    val windowInsetsController = ViewCompat.getWindowInsetsController(window.decorView) ?: return
    windowInsetsController.systemBarsBehavior = WindowInsetsControllerCompat.BEHAVIOR_SHOW_TRANSIENT_BARS_BY_SWIPE
    windowInsetsController.hide(WindowInsetsCompat.Type.systemBars())
}

Java:

private void hideSystemBars() {
    WindowInsetsControllerCompat windowInsetsController = ViewCompat.getWindowInsetsController(getWindow().getDecorView());
    if (windowInsetsController == null) {
        return;
    }
    windowInsetsController.setSystemBarsBehavior(WindowInsetsControllerCompat.BEHAVIOR_SHOW_TRANSIENT_BARS_BY_SWIPE);
    windowInsetsController.hide(WindowInsetsCompat.Type.systemBars());
}

更多信息:https://developer.android.com/training/system-ui/immersive

尝试使用style.xml中的appcompat。它为所有平台提供支持。

<!-- Application theme. -->
<style name="AppTheme.FullScreen" parent="AppTheme">
    <item name="android:windowFullscreen">true</item>
</style>


<!-- Application theme. -->
<style name="AppTheme" parent="@style/Theme.AppCompat.Light.NoActionBar" />

在AndroidManifest.xml文件:

<activity
    android:name=".Launch"
    android:label="@string/app_name"
    android:theme="@android:style/Theme.NoTitleBar.Fullscreen" > <!-- This line is important -->

    <intent-filter>
        <action android:name="android.intent.action.MAIN" />
        <category android:name="android.intent.category.LAUNCHER" />
    </intent-filter>
</activity>  

或者在Java代码中:

protected void onCreate(Bundle savedInstanceState){
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
}

根据安卓开发者培训

你应该做到以下几点:

科特林：

private fun hideSystemBars() {
  val windowInsetsController =
      ViewCompat.getWindowInsetsController(window.decorView) ?: return
  // Configure the behavior of the hidden system bars
  windowInsetsController.systemBarsBehavior =
      WindowInsetsControllerCompat.BEHAVIOR_SHOW_TRANSIENT_BARS_BY_SWIPE
  // Hide both the status bar and the navigation bar
  windowInsetsController.hide(WindowInsetsCompat.Type.systemBars())
}

Java:

private void hideSystemBars() {
  WindowInsetsControllerCompat windowInsetsController =
      ViewCompat.getWindowInsetsController(getWindow().getDecorView());
  if (windowInsetsController == null) {
    return;
  }
  // Configure the behavior of the hidden system bars
  windowInsetsController.setSystemBarsBehavior(
      WindowInsetsControllerCompat.BEHAVIOR_SHOW_TRANSIENT_BARS_BY_SWIPE
  );
  // Hide both the status bar and the navigation bar
  windowInsetsController.hide(WindowInsetsCompat.Type.systemBars());
}

内部styles.xml……

<!-- No action bar -->
<style name="NoActonBar" parent="Theme.AppCompat.Light.NoActionBar">
    <!-- Theme customization. -->
    <item name="colorPrimary">#000</item>
    <item name="colorPrimaryDark">#444</item>
    <item name="colorAccent">#999</item>
    <item name="android:windowFullscreen">true</item>
</style>

这对我很管用。希望对你有所帮助。

我想使用我自己的主题，而不是使用@android:style/ theme . notitlebar . fullscreen。但它并没有像这里的一些帖子所提到的那样工作，所以我做了一些调整来解决它。

在AndroidManifest.xml:

<activity
    android:name=".ui.activity.MyActivity"
    android:theme="@style/MyTheme">
</activity>

在styles.xml:

<style name="MyTheme">
    <item name="android:windowNoTitle">true</item>
    <item name="android:windowActionBar">false</item>
    <item name="windowNoTitle">true</item>
    <item name="windowActionBar">false</item>
    <item name="android:windowFullscreen">true</item>
</style>

注意:在我的情况下，我必须使用name="windowActionBar"而不是name="android:windowActionBar"在它正常工作之前。所以我只是使用了这两种方法，以确保我以后需要移植到新的Android版本。