在将Android支持库从r20更新到r21后，应用程序启动时遇到了`java.lang.NoSuchFieldError`，具体错误指向了`android.support.v7.appcompat.R$styleable.Theme_windowActionBar`。此错误通常发生在主题配置不匹配或依赖库版本冲突的情况下。检查项目的theme.xml文件和AndroidManifest.xml中引用的主题设置，确保与支持库版本兼容。同时，检查所有依赖项，防止旧版本库的干扰。
I updated my support library from r20 to r21, now when I run my app I get this error in super.onCreate of my main activity :
java.lang.NoSuchFieldError: android.support.v7.appcompat.R$styleable.Theme_windowActionBar
at android.support.v7.app.ActionBarActivityDelegate.onCreate(ActionBarActivityDelegate.java:145)
at android.support.v7.app.ActionBarActivityDelegateBase.onCreate(ActionBarActivityDelegateBase.java:139)
at android.support.v7.app.ActionBarActivity.onCreate(ActionBarActivity.java:123)
at (packageName).Main.onCreate(Main.java:64)
at android.app.Activity.performCreate(Activity.java)
at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java)
at android.app.ActivityThread.performLaunchActivity(ActivityThread.java)
at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java)
at android.app.ActivityThread.access$700(ActivityThread.java)
at android.app.ActivityThread$H.handleMessage(ActivityThread.java)
at android.os.Handler.dispatchMessage(Handler.java)
at android.os.Looper.loop(Looper.java)
at android.app.ActivityThread.main(ActivityThread.java)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java)
at dalvik.system.NativeStart.main(Native Method)
my theme.xml :
...
in manifest :
android:theme="@style/AppTheme"
what is the problem ?
thanks
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