“您需要在此活动中使用Theme.AppCompat主题（或后代）。”

Question

我是Android编程的新手，并且遇到了一个简单的XML问题。我正在尝试将我的空活动之一变成全屏活动。我尝试将这行代码android：theme =“ @ android：style / Theme.NoTitleBar.Fullscreen”添加到我的android清单文件中，最终导致我的应用在启动时崩溃。

如果这也有帮助，则受影响活动的Java文件扩展了AppCompatActivity。我看到其他一些帖子提到这会造成问题，但是我无法解决我的问题。

请帮助我解决此问题，同时仍使活动全屏显示。任何帮助表示赞赏。谢谢！

XML格式

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:roundIcon="@mipmap/ic_launcher_round"
    android:supportsRtl="true"
    android:theme="@style/Theme.AppCompat.Light">
    <activity android:name=".MainActivity"
        android:label="Marks Calculator">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.APP_CALCULATOR" />
        </intent-filter>
    </activity>
    <activity android:name=".Home_Activity"
        android:label="Finite Time Manager">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.HOME" />
        </intent-filter>
    </activity>
    <activity
        android:name=".Welcome_Activity"
        android:theme="@android:style/Theme.NoTitleBar.Fullscreen">
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

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

错误日志

12-22 12:21:30.214 32475-32475/com.managergmail.time.finite.finitemanager02 E/AndroidRuntime: FATAL EXCEPTION: main
    Process: com.managergmail.time.finite.finitemanager02, PID: 32475
    java.lang.RuntimeException: Unable to start activity ComponentInfo{com.managergmail.time.finite.finitemanager02/com.managergmail.time.finite.finitemanager02.Welcome_Activity}: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2581)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2647)
    at android.app.ActivityThread.-wrap11(ActivityThread.java)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1502)
    at android.os.Handler.dispatchMessage(Handler.java:111)
    at android.os.Looper.loop(Looper.java:207)
    at android.app.ActivityThread.main(ActivityThread.java:5763)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:888)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:749)
    Caused by: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
    at android.support.v7.app.AppCompatDelegateImplV9.createSubDecor(AppCompatDelegateImplV9.java:359)
    at android.support.v7.app.AppCompatDelegateImplV9.ensureSubDecor(AppCompatDelegateImplV9.java:328)
    at android.support.v7.app.AppCompatDelegateImplV9.setContentView(AppCompatDelegateImplV9.java:289)
    at android.support.v7.app.AppCompatActivity.setContentView(AppCompatActivity.java:140)
    at com.managergmail.time.finite.finitemanager02.Welcome_Activity.onCreate(Welcome_Activity.java:17)
    at android.app.Activity.performCreate(Activity.java:6280)
    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1116)
    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2534)
    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2647)
    at android.app.ActivityThread.-wrap11(ActivityThread.java)
    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1502)
    at android.os.Handler.dispatchMessage(Handler.java:111)
    at android.os.Looper.loop(Looper.java:207)
    at android.app.ActivityThread.main(ActivityThread.java:5763)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:888)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:749)

Answer 1

您Welcome_Activity可能会扩展，AppCompatActivity因此主题应该是appcompat主题。

在您的styles.xml文件中输入以下内容：

<style name="AppTheme.FullScreen" parent="@style/Theme.AppCompat.Light">
    <item name="windowNoTitle">true</item>
    <item name="windowActionBar">false</item>
    <item name="android:windowFullscreen">true</item>
    <item name="android:windowContentOverlay">@null</item>
</style>

现在您可以使用此主题：

<activity
    android:name=".Welcome_Activity"
    android:theme="@style/AppTheme.FullScreen">
    <intent-filter>
        <action android:name="android.intent.action.MAIN" />
        <category android:name="android.intent.category.LAUNCHER" />
    </intent-filter>
</activity>

这将为该特定活动应用全屏主题。如果您希望全屏显示整个应用程序，则可以用此主题替换清单中的应用程序主题。