Android的 - onLoadFinished不叫

问题描述

我现在面临与装载机的问题。

I am facing an issue with Loader.

我有一个活动，它显示了从本地数据库检索的记录列表。当活动开始，记录会自动通过LoaderManager.initLoader（）方法加载。

I have an Activity, which displays list of records retrieved from local DB. When the activity starts, records are automatically loaded via LoaderManager.initLoader() method.

也有可能以手动刷新经由ActionBarSherlock刷新按钮列表。然而，在完成其他活动还增加了一个记录到数据库后，onLoadFinished不叫。

There is also possibility to manually refresh the list via refresh button in ActionBarSherlock. However, after finishing another activity which adds a record to DB, onLoadFinished is not called.

我使用 SimpleCursorLoader 这里是code段从活动：

I am using SimpleCursorLoader and here is code snippet from the activity:

@Override
public void onStart() {
   ...
   getSupportLoaderManager().initLoader(0, null, this);
}

@Override
public void onPause() {
   ...
   getSupportLoaderManager().destroyLoader(0);
}

public void refreshRecords() {
   getSupportLoaderManager().restartLoader(0, null, this);
}

@Override
public Loader<Cursor> onCreateLoader(int id, final Bundle args) {
Loader<Cursor> l = new SimpleCursorLoader(this) {
    @Override
    public Cursor loadInBackground() {
        return recordDAO.getCursor();
    }
};
l.forceLoad();
return l;
}

@Override
public void onLoadFinished(Loader<Cursor> loader, Cursor c) {
   // updateUI
}

@Override
public void onLoaderReset(Loader<Cursor> loader) {
}

的问题是，在完成其他活动后， onLoaderCreate 被调用，但 onLoaderFinished 不叫。

The issue is that after finishing the other activity, onLoaderCreate is called, but onLoaderFinished is not called.

一些调试后，我发现， SimpleCursorAdapter.deliverResults（）也叫，蕾结束了对 ..如果（isReset（ ））{..

after some debugging, I've found that SimpleCursorAdapter.deliverResults() is also called, bud ends up on .. if (isReset()) { ..

我缺少的东西？如何强制数据的重载？

Am I missing something? How to force the reload of data?

感谢你在前进

推荐答案

我终于找到了解决这个问题的感谢讨论

I have finally found the solution to this problem thanks to the discussion on

https://groups.google.com/forum/#!topic/android-developers/DbKL6PVyhLI

public static <T> void initLoader(final int loaderId, final Bundle args, final LoaderCallbacks<T> callbacks,
        final LoaderManager loaderManager) {
    final Loader<T> loader = loaderManager.getLoader(loaderId);
    if (loader != null && loader.isReset()) {
        loaderManager.restartLoader(loaderId, args, callbacks);
    } else {
        loaderManager.initLoader(loaderId, args, callbacks);
    }
}

这篇关于Android的 - onLoadFinished不叫的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！