LocalCacheLoader.java

package be.digitalia.fosdem.loaders;

import android.content.Context;
import android.support.v4.content.AsyncTaskLoader;

public abstract class LocalCacheLoader<T> extends AsyncTaskLoader<T> {

	private T mResult;

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

	@Override
	protected void onStartLoading() {
		if (mResult != null) {
			// If we currently have a result available, deliver it
			// immediately.
			deliverResult(mResult);
		}

		if (takeContentChanged() || mResult == null) {
			// If the data has changed since the last time it was loaded
			// or is not currently available, start a load.
			forceLoad();
		}
	}

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

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

		onStopLoading();
		mResult = null;
	}

	@Override
	public void deliverResult(T data) {
		mResult = data;

		if (isStarted()) {
			// If the Loader is currently started, we can immediately
			// deliver its results.
			super.deliverResult(data);
		}
	}
}