Caused by: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant)

本文解决了Android开发中因使用不当的主题导致的IllegalStateException错误。具体表现为使用了非AppCompat主题的Activity继承了AppCompatActivity。解决方法是将Activity的主题设置为@style/Theme.AppCompat系列。

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具体的报错信息为:
Caused by: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.

出现这个问题是因为我在AndroidManifest.xml文件中的activity设置了theme,而且用的不是@style/Theme.AppCompat.等等。

然后我就直接改为@style/Theme.AppCompat.啥啥的,就可以了不报错了。

报错的原因是因为的这个Activity继承了AppCompatActivity。

在AppCompatActivity类的文件中有一句说明

/**
 * Base class for activities that use the
 * <a href="{@docRoot}tools/extras/support-library.html">support library</a> action bar features.
 *
 * <p>You can add an {@link android.support.v7.app.ActionBar} to your activity when running on API level 7 or higher
 * by extending this class for your activity and setting the activity theme to
 * {@link android.support.v7.appcompat.R.style#Theme_AppCompat Theme.AppCompat} or a similar theme.
 *  ……
 */
public class AppCompatActivity extends FragmentActivity implements AppCompatCallback,
        TaskStackBuilder.SupportParentable, ActionBarDrawerToggle.DelegateProvider {
        ……
        }

所以我推测只要继承了AppCompatActivity的类的theme必须是以@style/Theme.AppCompat开头的,这样就不会报错了。

如果有错,希望留言纠正,谢谢!

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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