Android 如何更改标题栏中心的清单标签？

如何在中心更改清单文件标签。我试过下面的方法，但我没有 获取输出我在清单文件中添加一个代码android:gravity=“center 在样式文件中，我添加居中它 不工作，所以给我一个好的解决方案

清单代码

<uses-permission android:name="android.permission.INTERNET"></uses-
permission>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"></uses-permission>

<supports-screens
    android:largeScreens="true"
    android:normalScreens="true"
    android:smallScreens="true"
    android:xlargeScreens="true"></supports-screens>

<application
    android:allowBackup="true"
    android:configChanges="keyboardHidden|orientation|screenSize"
    android:largeHeap="true"
    android:gravity="center"
    android:label="See ME First"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    <activity android:name=".MainActivity"
        android:screenOrientation="portrait">
    <intent-filter>
            <action android:name="android.intent.action.MAIN" />

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

    <activity android:name=".Webview"
        android:configChanges="keyboardHidden|screenSize|orientation">
    </activity>
   </application>
    </manifest>

 <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
        <!-- Customize your theme here. -->
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="colorAccent">@color/colorAccent</item>
        <item name="android:gravity">center</item>
 </style>

样式代码

<uses-permission android:name="android.permission.INTERNET"></uses-
permission>
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"></uses-permission>

<supports-screens
    android:largeScreens="true"
    android:normalScreens="true"
    android:smallScreens="true"
    android:xlargeScreens="true"></supports-screens>

<application
    android:allowBackup="true"
    android:configChanges="keyboardHidden|orientation|screenSize"
    android:largeHeap="true"
    android:gravity="center"
    android:label="See ME First"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:supportsRtl="true"
    android:theme="@style/AppTheme">
    <activity android:name=".MainActivity"
        android:screenOrientation="portrait">
    <intent-filter>
            <action android:name="android.intent.action.MAIN" />

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

    <activity android:name=".Webview"
        android:configChanges="keyboardHidden|screenSize|orientation">
    </activity>
   </application>
    </manifest>

 <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
        <!-- Customize your theme here. -->
        <item name="colorPrimary">@color/colorPrimary</item>
        <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
        <item name="colorAccent">@color/colorAccent</item>
        <item name="android:gravity">center</item>
 </style>

@颜色/原色
@颜色/原色暗
@颜色/颜色重音
居中

---

我是否应该在我的代码中添加一些内容…！

如果您试图在应用程序栏（在Java中称为

Toolbar

或

ActionBar

）中将标题设置为中心，则您在错误的位置执行此操作。选中此项可将应用程序栏中的标题设置为中心：将您的activity\u main.xml放在此处