AsyncTaskLoader endless onCanceled调用

我正在创建一个基于http://developer.android.com/reference/android/content/AsyncTaskLoader.html的AsyncTaskLoader。根据我的日志记录，当我运行我的应用时，应用无休止地在loadInBackground和onCanceled之间振荡。有谁知道为什么会出现这个错误？我的BroadcastReceiver基于Proper notification of AsyncTaskLoader about data changes from background thread。AsyncTaskLoader endless onCanceled调用

这是我的loadInBackground方法：

@Override  
public List<MyItem> loadInBackground() {  

    List<MyItem> items = createDummyData(); 

    LocalBroadcastManager.getInstance(getContext()).sendBroadcast(new Intent(RECEIVER_FILTER_STRING));  

    Log.d(TAG,”custom loader send broadcast from background and send items: "+items.size());  

    return items;  
}

这是我的onStartLoading

@Override 
    protected void onStartLoading() { 
    Log.d(TAG, "items loader onStartLoading"); 
    if (null != mData) { 
     Log.d(TAG, "items loader onStartLoading mData not null"); 
     //someone is calling to start the loader, so if we have data, deliver it now 
     deliverResult(mData); 
    } 

    if (null == mReceiver) { 
     Log.d(TAG, "items loader onStartLoading register receiver"); 
     mReceiver = new LoaderBroadcastReceiver(this); 
     LocalBroadcastManager.getInstance(getContext()). 
      registerReceiver(mReceiver, new IntentFilter(RECEIVER_FILTER_STRING)); 
    } 

    if (takeContentChanged() || null == mData) { 
     //if data has changed since the last time it was loaded or is not available, then: 
     Log.d(TAG, "items loader onStartLoading onChange forceLoad"); 
     forceLoad(); 
    } 
    }

这是我的接收机

class LoaderBroadcastReceiver extends BroadcastReceiver { 
    private Loader loader; 

    public LoaderBroadcastReceiver(Loader loader) { 
     this.loader = loader; 
    } 

    @Override 
    public void onReceive(Context context, Intent intent) { 
     Log.d(TAG, "loader receiver informing of oonContentChagned"); 
     loader.onContentChanged(); 
    } 
    }

来源

2015-09-06 learner

当它加载的背景下，其发送广播，和广播电话onContentChanged()这就是为什么当前的装载机被取消了再次运行。

您应该简单地删除BroadcastReceiver，或者BroadcastReceiver不应该调用onContentChanged（）。

从您引用的链接中，BroadcastReceiver用于这样的事情，例如，您加载器将文件列表加载到一个文件夹中，出于某种原因，您知道添加了新文件，因此您发送广播（而不是加载器）并强制加载器重新运行并获取新内容。

公共无效onContentChanged（）在API级别11

当Loader.ForceLoadContentObserver检测到改变时调用。默认实现检查是否加载器当前是已启动;如果是这样，它只是调用forceLoad（）;

来源

2015-09-07 05:00:28

AsyncTaskLoader endless onCanceled调用

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