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Issue 14944 attachment: AsyncLoader.java (1.7 KB)

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/*
* Copyright (C) 2011 Alexander Blom
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/

import android.content.AsyncTaskLoader;
import android.content.Context;

/**
* Loader which extends AsyncTaskLoaders and handles caveats
* as pointed out in http://code.google.com/p/android/issues/detail?id=14944.
*
* Based on CursorLoader.java in the Fragment compatibility package
*
* @author Alexander Blom (me@alexanderblom.se)
*
* @param <D> data type
*/
public abstract class AsyncLoader<D> extends AsyncTaskLoader<D> {
private D data;

public AsyncLoader(Context context) {
super(context);
}

@Override
public void deliverResult(D data) {
if (isReset()) {
// An async query came in while the loader is stopped
return;
}

this.data = data;

super.deliverResult(data);
}


@Override
protected void onStartLoading() {
if (data != null) {
deliverResult(data);
}

if (takeContentChanged() || data == null) {
forceLoad();
}
}

@Override
protected void onStopLoading() {
// Attempt to cancel the current load task if possible.
cancelLoad();
}

@Override
protected void onReset() {
super.onReset();

// Ensure the loader is stopped
onStopLoading();

data = null;
}


}
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