java.lang.IllegalStateException: This Activity already has an action bar supplied by the window deco

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本文解决了一个常见的Android开发问题，即当使用AppCompat库时，由于主题设置不当导致的ActionBar与Toolbar冲突。通过调整AndroidManifest.xml中的主题配置和styles.xml文件的主题设置，可以避免ActionBar重复加载的问题。

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.network/com.example.network.activity.QQChatActivity}: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.network/com.example.network.activity.QQContactActivity}: java.lang.IllegalStateException: This Activity already has an action bar supplied by the window decor. Do not request Window.FEATURE_SUPPORT_ACTION_BAR and set windowActionBar to false in your theme to use a Toolbar instead.
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3430)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3614)
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:86)
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108)
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2199)
        at android.os.Handler.dispatchMessage(Handler.java:112)
        at android.os.Looper.loop(Looper.java:216)
        at android.app.ActivityThread.main(ActivityThread.java:7625)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:524)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:987)
     Caused by: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.network/com.example.network.activity.QQContactActivity}: java.lang.IllegalStateException: This Activity already has an action bar supplied by the window decor. Do not request Window.FEATURE_SUPPORT_ACTION_BAR and set windowActionBar to false in your theme to use a Toolbar instead.
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3430)
        at android.app.ActivityThread.startActivityNow(ActivityThread.java:3217)
        at android.app.LocalActivityManager.moveToState(LocalActivityManager.java:139)
        at android.app.LocalActivityManager.startActivity(LocalActivityManager.java:366)
        at com.example.network.activity.QQChatActivity.toActivity(QQChatActivity.java:71)
        at com.example.network.activity.QQChatActivity.changeContainerView(QQChatActivity.java:57)
        at com.example.network.activity.QQChatActivity.onCreate(QQChatActivity.java:36)
        at android.app.Activity.performCreate(Activity.java:7458)
        at android.app.Activity.performCreate(Activity.java:7448)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1286)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3409)
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3614) 
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:86) 
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108) 
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2199) 
        at android.os.Handler.dispatchMessage(Handler.java:112) 
        at android.os.Looper.loop(Looper.java:216) 
        at android.app.ActivityThread.main(ActivityThread.java:7625) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:524) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:987) 
     Caused by: java.lang.IllegalStateException: This Activity already has an action bar supplied by the window decor. Do not request Window.FEATURE_SUPPORT_ACTION_BAR and set windowActionBar to false in your theme to use a Toolbar instead.
        at android.support.v7.app.AppCompatDelegateImpl.setSupportActionBar(AppCompatDelegateImpl.java:345)
        at android.support.v7.app.AppCompatActivity.setSupportActionBar(AppCompatActivity.java:130)
        at com.example.network.activity.QQContactActivity.onCreate(QQContactActivity.java:57)
        at android.app.Activity.performCreate(Activity.java:7458)
        at android.app.Activity.performCreate(Activity.java:7448)
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1286)
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3409)
        at android.app.ActivityThread.startActivityNow(ActivityThread.java:3217) 
        at android.app.LocalActivityManager.moveToState(LocalActivityManager.java:139) 
        at android.app.LocalActivityManager.startActivity(LocalActivityManager.java:366) 
        at com.example.network.activity.QQChatActivity.toActivity(QQChatActivity.java:71) 
        at com.example.network.activity.QQChatActivity.changeContainerView(QQChatActivity.java:57) 
        at com.example.network.activity.QQChatActivity.onCreate(QQChatActivity.java:36) 
        at android.app.Activity.performCreate(Activity.java:7458) 
        at android.app.Activity.performCreate(Activity.java:7448) 
        at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1286) 
        at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:3409) 
        at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:3614) 
        at android.app.servertransaction.LaunchActivityItem.execute(LaunchActivityItem.java:86) 
        at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:108) 
        at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:68) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2199) 
        at android.os.Handler.dispatchMessage(Handler.java:112) 
        at android.os.Looper.loop(Looper.java:216) 
        at android.app.ActivityThread.main(ActivityThread.java:7625) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:524) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:987) 

 

 

把AndroidManifest.xml

下的主题android:theme该为如下

AppCompatTheme

styles.xml具体配置为默认
  <style name="AppCompatTheme" parent="Theme.AppCompat.Light.NoActionBar">
    </style>

 

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