我有一个抽象类扩展ActionBarActivity。在onCreate中，我有：

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

supportRequestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);

...

}

应用程序崩溃，由于requestFeature()之前内容错误，特别是在行super.onCreate(savedInstanceState)。阅读了一些类似的帖子后，我想出了这个解决方案：

@Override

protected void onCreate(Bundle savedInstanceState) {

requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);

super.onCreate(savedInstanceState);

...

}

我的问题是：为什么它在超级电话崩溃？此外，我不是settingContentView在类中扩展这个类，直到我调用super.onCreate之后。它仍然偶尔崩溃。

java.lang.RuntimeException: Unable to start activity ComponentInfo{com.myapp/com.myapp.cycle.Cycle}: android.util.AndroidRuntimeException: requestFeature() must be called before adding content

at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2351)

at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2387)

at android.app.ActivityThread.access$600(ActivityThread.java:151)

at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1331)

at android.os.Handler.dispatchMessage(Handler.java:99)

at android.os.Looper.loop(Looper.java:155)

at android.app.ActivityThread.main(ActivityThread.java:5454)

at java.lang.reflect.Method.invokeNative(Native Method)

at java.lang.reflect.Method.invoke(Method.java:511)

at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1029)

at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:796)

at dalvik.system.NativeStart.main(Native Method)

Caused by: android.util.AndroidRuntimeException: requestFeature() must be called before adding content

at com.android.internal.policy.impl.PhoneWindow.requestFeature(PhoneWindow.java:320)

at android.app.Activity.requestWindowFeature(Activity.java:3283)

at android.support.v7.app.ActionBarActivityDelegateICS.onCreate(ActionBarActivityDelegateICS.java:63)

at android.support.v7.app.ActionBarActivity.onCreate(ActionBarActivity.java:98)

at com.myapp.core.activity.MyActivity.onCreate(MyActivity.java:83)

at com.myapp.cycle.Cycle.onCreate(Cycle.java:55)

at android.app.Activity.performCreate(Activity.java:5066)

at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1101)

at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2307)

... 11 more