Android Open Source - Test-SimpleTwitterClient Tweet Loader

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Java Source Code

package com.example.Twitter_Android.Loaders;
//w  w  w .j  av a 2s . c o  m
import android.content.AsyncTaskLoader;
import android.content.Context;
import android.preference.PreferenceManager;
import com.example.Twitter_Android.AppActivity.SettingsActivity;

import java.util.List;

abstract class TweetLoader<T> extends AsyncTaskLoader<List<T>> {
  protected final int RESULT_COUNT;
  private List<T> loadedTweets;
  private static final String DEFAULT_TWEET_COUNT = "50";

  //------------------------------------------------------------------------------------------------------------------
  TweetLoader(Context context) {
    super(context);
    String value = PreferenceManager.getDefaultSharedPreferences(context).getString(SettingsActivity.ALLOWED_TWEET_COUNT, DEFAULT_TWEET_COUNT);
    RESULT_COUNT = Integer.valueOf(value);
  }
  //------------------------------------------------------------------------------------------------------------------

  @Override
  public void deliverResult(List<T> data) {
    if (isReset()) {
      releaseResources(data);
      return;
    }
    List<T> oldData = loadedTweets;
    loadedTweets = data;

    if (isStarted()) {
      super.deliverResult(data);
    }

    if (oldData != null && oldData != data) {
      releaseResources(oldData);
    }
  }

  void setLoadedTweets(List<T> loadedData) {
    loadedTweets = loadedData;
  }
  //------------------------------------------------------------------------------------------------------------------

  @Override
  protected void onStartLoading() {
    super.onStartLoading();
    if (loadedTweets != null && loadedTweets.size() > 0) {
      deliverResult(loadedTweets);
    } else {
      forceLoad();
    }
  }
  //------------------------------------------------------------------------------------------------------------------

  @Override
  protected void onStopLoading() {
    cancelLoad();
  }
  //------------------------------------------------------------------------------------------------------------------

  @Override
  protected void onReset() {
    // Ensure the loader has been stopped.
    onStopLoading();

    // At this point we can release the resources associated with 'mData'.
    if (loadedTweets != null) {
      releaseResources(loadedTweets);
      loadedTweets = null;
    }
  }

  //------------------------------------------------------------------------------------------------------------------

  @Override
  public void onCanceled(List<T> data) {
    super.onCanceled(data);
    releaseResources(data);
  }
  //------------------------------------------------------------------------------------------------------------------

  @Override
  public abstract List<T> loadInBackground();
  //------------------------------------------------------------------------------------------------------------------

  private void releaseResources(List<T> data) {
    if (data != null) {
      data.clear();
    }
  }
}

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