Caused by: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme

本文详细解释了在Android开发中,如何正确配置AppCompatActivity的主题,避免因引用错误导致的显示异常。通过修改style文件中的parent属性,从Theme.Holo.Light更改为Theme.AppCompat.Light.NoActionBar,确保了应用主题的一致性和正确性。

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在继承了 AppCompatActivity 的活动 中  在AndroidManifest.xml 中活动主题引用的却是Activity的主题

style文件
 <style name="AppTheme" parent="android:Theme.Holo.Light">
        <!-- Customize your theme here. -->
    </style>

AndroidManifest.xml

<activity android:name=".ui.user.CollectActivity" android:theme="@style/AppTheme"/>

如上述代码 显示是会出问题的

可以选择直接将 style文件中  parent进行修改 如下

 <style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
        <!-- Customize your theme here. -->
    </style>
E/AndroidRuntime: FATAL EXCEPTION: main Process: com.example.hjschoolhelper210301201_1, PID: 2778 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.hjschoolhelper210301201_1/com.example.hjschoolhelper210301201_1.LoginMainActivity}: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity. at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3645) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3782) at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:101) at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135) at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95) at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2307) at android.os.Handler.dispatchMessage(Handler.java:106) at android.os.Looper.loopOnce(Looper.java:201) at android.os.Looper.loop(Looper.java:288) at android.app.ActivityThread.main(ActivityThread.java:7872) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:936) Caused by: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity. at androidx.appcompat.app.AppCompatDelegateImpl.createSubDecor(AppCompatDelegateImpl.java:846) at androidx.appcompat.app.AppCompatDelegateImpl.ensureSubDecor(AppCompatDelegateImpl.java:809) at androidx.appcompat.app.AppCompatDelegateImpl.setContentView(AppCompatDelegateImpl.java:696) at androidx.appcompat.app.AppCompatActivity.setContentView(AppCompatActivity.java:195) at com.example.hjschoolhelper210301201_1.LoginMainActivity.onCreate(LoginMainActivity.java:26) at android.app.Activity.performCreate(Activity.java:8305) at android.app.Activity.performCreate(Activity.java:8284) at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1417) at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3626) at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3782)  at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:101)  at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)  at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2307)  at android.os.Handler.dispatchMessage(Handler.java:106)  at android.os.Looper.loopOnce(Looper.java:201)  at android.os.Looper.loop(Looper.java:288)  at android.app.ActivityThread.main(ActivityThread.java:7872)  at java.lang.reflect.Method.invoke(Native Method)  at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:936) 
05-23
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