Android Open Source - cwac-loaderex Shared Preferences Loader

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License

The source code is released under:

Apache License

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Java Source Code

/*
 * Copyright (c) 2012 CommonsWare, LLC/*  w  ww . j a  va  2 s  .c  o  m*/
 *
 * 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.
 */

package com.commonsware.cwac.loaderex;

import android.annotation.TargetApi;
import android.content.AsyncTaskLoader;
import android.content.Context;
import android.content.SharedPreferences;
import android.os.Build;
import android.preference.PreferenceManager;

@TargetApi(Build.VERSION_CODES.HONEYCOMB)
public class SharedPreferencesLoader extends
    AsyncTaskLoader<SharedPreferences> implements
    SharedPreferences.OnSharedPreferenceChangeListener {
  private SharedPreferences prefs=null;

  public static void persist(final SharedPreferences.Editor editor) {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.GINGERBREAD) {
      editor.apply();
    }
    else {
      new Thread() {
        public void run() {
          editor.commit();
        }
      }.start();
    }
  }

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

  /**
   * Runs on a worker thread, loading in our data.
   */
  @Override
  public SharedPreferences loadInBackground() {
    prefs=PreferenceManager.getDefaultSharedPreferences(getContext());
    prefs.registerOnSharedPreferenceChangeListener(this);
    
    return(prefs);
  }

  @Override
  public void onSharedPreferenceChanged(SharedPreferences sharedPreferences,
                                        String key) {
    onContentChanged();
  }

  /**
   * Starts an asynchronous load of the list data. When the
   * result is ready the callbacks will be called on the UI
   * thread. If a previous load has been completed and is
   * still valid the result may be passed to the callbacks
   * immediately.
   * 
   * Must be called from the UI thread.
   */
  @Override
  protected void onStartLoading() {
    if (prefs != null) {
      deliverResult(prefs);
    }

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

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