Android Open Source - retention-magic Fragment

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License

The source code is released under:

Apache License

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Java Source Code

/*
 * Copyright (C) 2013 Marten Gajda <marten@dmfs.org>
 *//from w  w w .  j  a  v  a  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 org.dmfs.android.retentionmagic;

import android.app.Activity;
import android.content.SharedPreferences;
import android.os.Build.VERSION;
import android.os.Build.VERSION_CODES;
import android.os.Bundle;


/**
 * A {@link android.app.Fragment} that can retain field values.
 * 
 * @author Marten Gajda <marten@dmfs.org>
 */
public class Fragment extends android.app.Fragment
{
  private SharedPreferences mPrefs;

  @Override
  public void onAttach(Activity activity)
  {
    super.onAttach(activity);
    RetentionMagic.init(this, getArguments());
  }


  @Override
  public void onCreate(Bundle savedInstanceState)
  {
    super.onCreate(savedInstanceState);

    Activity activity = getActivity();
    mPrefs = activity.getSharedPreferences(activity.getPackageName() + ".sharedPrefences", 0);

    if (savedInstanceState == null)
    {
      RetentionMagic.init(this, mPrefs);
    }
    else
    {
      RetentionMagic.restore(this, savedInstanceState);
    }
  }


  @Override
  public void onSaveInstanceState(Bundle outState)
  {
    super.onSaveInstanceState(outState);
    RetentionMagic.store(this, outState);
  }


  @Override
  public void onPause()
  {
    super.onPause();
    /*
     * On older SDK version we have to store permanent data in onPause(), because there is no guarantee that onStop() will be called.
     */
    if (VERSION.SDK_INT < VERSION_CODES.HONEYCOMB)
    {
      RetentionMagic.persist(this, mPrefs);
    }
  }


  @Override
  public void onStop()
  {
    super.onStop();
    if (VERSION.SDK_INT >= VERSION_CODES.HONEYCOMB)
    {
      RetentionMagic.persist(this, mPrefs);
    }
  }
}

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