使用ActionBarCompat和requestWindowFeature

到目前为止,我从ActionBarSherlock转移到ActionBarCompat没有更大的问题。 在我的Nexus 4上,它的效果非常好。 当我开始测试运行2.3.6的旧版Nexus One时,我在旋转设备时遇到了问题。 我请求一个Windowfunction来显示ActionBar中的中间进度:

@Override protected void onCreate(final Bundle savedInstanceState) { super.onCreate(savedInstanceState); requestWindowFeature(android.view.Window.FEATURE_PROGRESS); requestWindowFeature(android.view.Window.FEATURE_INDETERMINATE_PROGRESS); setupActionBar(getSupportActionBar()); } 

这在Jelly Bean上非常有用。

在2.3.6上获取此Stack Trace:

 08-12 13:34:09.242: E/AndroidRuntime(4602): FATAL EXCEPTION: main 08-12 13:34:09.242: E/AndroidRuntime(4602): java.lang.RuntimeException: Unable to start activity ComponentInfo{net.app.packagename/net.app.fragment.CustomActivity}: android.util.AndroidRuntimeException: requestFeature() must be called before adding content 08-12 13:34:09.242: E/AndroidRuntime(4602): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647) 08-12 13:34:09.242: E/AndroidRuntime(4602): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663) 08-12 13:34:09.242: E/AndroidRuntime(4602): at android.app.ActivityThread.handleRelaunchActivity(ActivityThread.java:2832) 08-12 13:34:09.242: E/AndroidRuntime(4602): at android.app.ActivityThread.access$1600(ActivityThread.java:117) 08-12 13:34:09.242: E/AndroidRuntime(4602): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:935) 08-12 13:34:09.242: E/AndroidRuntime(4602): at android.os.Handler.dispatchMessage(Handler.java:99) 08-12 13:34:09.242: E/AndroidRuntime(4602): at android.os.Looper.loop(Looper.java:130) 08-12 13:34:09.242: E/AndroidRuntime(4602): at android.app.ActivityThread.main(ActivityThread.java:3683) 08-12 13:34:09.242: E/AndroidRuntime(4602): at java.lang.reflect.Method.invokeNative(Native Method) 08-12 13:34:09.242: E/AndroidRuntime(4602): at java.lang.reflect.Method.invoke(Method.java:507) 08-12 13:34:09.242: E/AndroidRuntime(4602): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 08-12 13:34:09.242: E/AndroidRuntime(4602): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 08-12 13:34:09.242: E/AndroidRuntime(4602): at dalvik.system.NativeStart.main(Native Method) 08-12 13:34:09.242: E/AndroidRuntime(4602): Caused by: android.util.AndroidRuntimeException: requestFeature() must be called before adding content 08-12 13:34:09.242: E/AndroidRuntime(4602): at com.android.internal.policy.impl.PhoneWindow.requestFeature(PhoneWindow.java:181) 08-12 13:34:09.242: E/AndroidRuntime(4602): at android.app.Activity.requestWindowFeature(Activity.java:2729) 08-12 13:34:09.242: E/AndroidRuntime(4602): at net.app.fragment.BaseFragmentActivity.onCreate(BaseFragmentActivity.java:50) 08-12 13:34:09.242: E/AndroidRuntime(4602): at net.app.fragment.CustomActivity.onCreate(CustomActivity.java:55) 08-12 13:34:09.242: E/AndroidRuntime(4602): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 08-12 13:34:09.242: E/AndroidRuntime(4602): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611) 08-12 13:34:09.242: E/AndroidRuntime(4602): ... 12 more 08-12 13:34:12.092: I/Process(4602): Sending signal. PID: 4602 SIG: 9 

谁知道如何解决这个问题?

问候

调用supportRequestWindowFeature(Window.FEATURE_...)

请参阅http://android-developers.blogspot.com/2013/08/actionbarcompat-and-io-2013-app-source.html

使用supportRequestWindowFeature(WindowCompat.FEATURE_xxx)

即,您还需要使用WindowCompat.FEATURE_xxx而不是Window.FEATURE_xxx来实现向后兼容性。

对于那些不调用requestWindowFeature()方法但仍然获得exception的人,请尝试以下解决方法:

 @Override protected void onCreate(Bundle savedInstanceState) { try { super.onCreate(savedInstanceState); } catch (Throwable e) { //dummy workaround } setContentView(getLayoutResId()); 

请参阅https://code.google.com/p/android/issues/detail?id=60841

错误日志清楚地说’在添加内容之前必须调用’requestFeature()’。 所以你必须调用’super.onCreate(savedInstanceState);’ 在’requestWindowFeature’调用之后。 并且不需要像上面提到的那样调用supportRequestWindowFeature(Window.FEATURE _…)。 请参阅下面的工作代码。

  @Override public void onCreate(Bundle savedInstanceState) { requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS); requestWindowFeature(Window.FEATURE_PROGRESS); super.onCreate(savedInstanceState);