java - addParentStack 中的 NameNotFoundException

Question

我正在尝试构建一个通知并显示它，还为我正在显示的 Intent 构建一个堆栈。但是我得到一个 NameNotFoundException。

Intent resultIntent = new Intent(mContext, ForecastFragment.class);

TaskStackBuilder stackBuilder = TaskStackBuilder.create(mContext);
stackBuilder.addParentStack(ForecastFragment.class);
stackBuilder.addNextIntent(resultIntent);
PendingIntent resultPendingIntent = stackBuilder.
                    getPendingIntent(0, PendingIntent.FLAG_UPDATE_CURRENT);
mBuilder.setContentIntent(resultPendingIntent);
NotificationManager notificationManager =
                    (NotificationManager) mContext.getSystemService(Context.NOTIFICATION_SERVICE);
notificationManager.notify(10 ,mBuilder.build());

这是我得到的异常。

3541-3562/com.example.android.sunshine.app E/AndroidRuntime: FATAL EXCEPTION: SyncAdapterThread-1
          Process: com.example.android.sunshine.app, PID: 3541
          java.lang.IllegalArgumentException: android.content.pm.PackageManager$NameNotFoundException: ComponentInfo{com.example.android.sunshine.app/com.example.android.sunshine.app.ForecastFragment}
             at android.support.v4.app.TaskStackBuilder.addParentStack(TaskStackBuilder.java:247)
             at android.support.v4.app.TaskStackBuilder.addParentStack(TaskStackBuilder.java:226)
             at com.example.android.sunshine.app.sync.SunshineSyncAdapter.notifyWeather(SunshineSyncAdapter.java:526)
             at com.example.android.sunshine.app.sync.SunshineSyncAdapter.getWeatherDataFromJson(SunshineSyncAdapter.java:424)
             at com.example.android.sunshine.app.sync.SunshineSyncAdapter.onPerformSync(SunshineSyncAdapter.java:255)
             at android.content.AbstractThreadedSyncAdapter$SyncThread.run(AbstractThreadedSyncAdapter.java:259)
          Caused by: android.content.pm.PackageManager$NameNotFoundException: ComponentInfo{com.example.android.sunshine.app/com.example.android.sunshine.app.ForecastFragment}
             at android.app.ApplicationPackageManager.getActivityInfo(ApplicationPackageManager.java:314)
             at android.support.v4.app.NavUtils.getParentActivityName(NavUtils.java:301)
             at android.support.v4.app.NavUtils.getParentActivityIntent(NavUtils.java:256)
             at android.support.v4.app.TaskStackBuilder.addParentStack(TaskStackBuilder.java:240)
             at android.support.v4.app.TaskStackBuilder.addParentStack(TaskStackBuilder.java:226) 
             at com.example.android.sunshine.app.sync.SunshineSyncAdapter.notifyWeather(SunshineSyncAdapter.java:526) 
             at com.example.android.sunshine.app.sync.SunshineSyncAdapter.getWeatherDataFromJson(SunshineSyncAdapter.java:424) 
             at com.example.android.sunshine.app.sync.SunshineSyncAdapter.onPerformSync(SunshineSyncAdapter.java:255) 
             at android.content.AbstractThreadedSyncAdapter$SyncThread.run(AbstractThreadedSyncAdapter.java:259)

我检查了包名称和放置类 ForecastFragment 的包，但它们都是正确的。有人可以帮我整理一下吗。

Answer 1

fragment 不是组件，不能与 Intent 一起使用。只有 Activity、Service 或 BroadcastReceiver 等组件可用于构建 Intent。

因此，您的第一行 (new Intent(mContext, ForecaseFragment.class)) 和 addParentStack(ForecastFragment.class) 都是无效的。您需要使用在包含该 fragment 的 list 中注册的 Activity。