onStart 方法中的restartLoader 抛出异常

Question

我正在使用 android 兼容包来使用 Loaders 。当我在onCreate 方法中初始化加载器或重新启动它时，它只是找到了但是当我在onStart 中重新启动或初始化它时它会抛出一个错误，我想知道为什么“有时”当我在活动的onCreate 并单击一些按钮，在加载器将数据绑定到 UI 之前快速将我移动到另一个活动，然后返回到先前启动加载器的活动，加载器不加载数据“UI 上没有出现任何内容?!!!! 所以我认为将 initLoader 移动到 onStart 但它会引发错误

07-13 03:19:15.140: E/AndroidRuntime(23179): java.lang.RuntimeException: Unable to resume activity {biz.dot.khtmeh/biz.dot.khtmeh.ui.HomeScreen}: java.lang.IllegalStateException: There is already a listener registered
07-13 03:19:15.140: E/AndroidRuntime(23179):    at android.app.ActivityThread.performResumeActivity(ActivityThread.java:2444)
07-13 03:19:15.140: E/AndroidRuntime(23179):    at android.app.ActivityThread.handleResumeActivity(ActivityThread.java:2472)
07-13 03:19:15.140: E/AndroidRuntime(23179):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1173)
07-13 03:19:15.140: E/AndroidRuntime(23179):    at android.os.Handler.dispatchMessage(Handler.java:99)
07-13 03:19:15.140: E/AndroidRuntime(23179):    at android.os.Looper.loop(Looper.java:137)
07-13 03:19:15.140: E/AndroidRuntime(23179):    at android.app.ActivityThread.main(ActivityThread.java:4424)
07-13 03:19:15.140: E/AndroidRuntime(23179):    at java.lang.reflect.Method.invokeNative(Native Method)
07-13 03:19:15.140: E/AndroidRuntime(23179):    at java.lang.reflect.Method.invoke(Method.java:511)
07-13 03:19:15.140: E/AndroidRuntime(23179):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
07-13 03:19:15.140: E/AndroidRuntime(23179):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
07-13 03:19:15.140: E/AndroidRuntime(23179):    at dalvik.system.NativeStart.main(Native Method)
07-13 03:19:15.140: E/AndroidRuntime(23179): Caused by: java.lang.IllegalStateException: There is already a listener registered
07-13 03:19:15.140: E/AndroidRuntime(23179):    at android.support.v4.content.Loader.registerListener(Loader.java:130)
07-13 03:19:15.140: E/AndroidRuntime(23179):    at android.support.v4.app.LoaderManagerImpl$LoaderInfo.start(LoaderManager.java:259)
07-13 03:19:15.140: E/AndroidRuntime(23179):    at android.support.v4.app.LoaderManagerImpl.installLoader(LoaderManager.java:509)
07-13 03:19:15.140: E/AndroidRuntime(23179):    at android.support.v4.app.LoaderManagerImpl.createAndInstallLoader(LoaderManager.java:496)
07-13 03:19:15.140: E/AndroidRuntime(23179):    at android.support.v4.app.LoaderManagerImpl.restartLoader(LoaderManager.java:642)

Answer 1

您可能不止一次地重复使用加载程序。每次调用 onCreateLoader(..) 时，您都应该返回一个 Loader<T> 的新实例。