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      1 /*
      2  * Copyright (C) 2012 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 package com.example.android.fragments;
     17 
     18 import android.support.v4.app.Fragment;
     19 import android.os.Bundle;
     20 import android.view.LayoutInflater;
     21 import android.view.View;
     22 import android.view.ViewGroup;
     23 import android.widget.TextView;
     24 
     25 public class ArticleFragment extends Fragment {
     26     final static String ARG_POSITION = "position";
     27     int mCurrentPosition = -1;
     28 
     29     @Override
     30     public View onCreateView(LayoutInflater inflater, ViewGroup container,
     31         Bundle savedInstanceState) {
     32 
     33         // If activity recreated (such as from screen rotate), restore
     34         // the previous article selection set by onSaveInstanceState().
     35         // This is primarily necessary when in the two-pane layout.
     36         if (savedInstanceState != null) {
     37             mCurrentPosition = savedInstanceState.getInt(ARG_POSITION);
     38         }
     39 
     40         // Inflate the layout for this fragment
     41         return inflater.inflate(R.layout.article_view, container, false);
     42     }
     43 
     44     @Override
     45     public void onStart() {
     46         super.onStart();
     47 
     48         // During startup, check if there are arguments passed to the fragment.
     49         // onStart is a good place to do this because the layout has already been
     50         // applied to the fragment at this point so we can safely call the method
     51         // below that sets the article text.
     52         Bundle args = getArguments();
     53         if (args != null) {
     54             // Set article based on argument passed in
     55             updateArticleView(args.getInt(ARG_POSITION));
     56         } else if (mCurrentPosition != -1) {
     57             // Set article based on saved instance state defined during onCreateView
     58             updateArticleView(mCurrentPosition);
     59         }
     60     }
     61 
     62     public void updateArticleView(int position) {
     63         TextView article = (TextView) getActivity().findViewById(R.id.article);
     64         article.setText(Ipsum.Articles[position]);
     65         mCurrentPosition = position;
     66     }
     67 
     68     @Override
     69     public void onSaveInstanceState(Bundle outState) {
     70         super.onSaveInstanceState(outState);
     71 
     72         // Save the current article selection in case we need to recreate the fragment
     73         outState.putInt(ARG_POSITION, mCurrentPosition);
     74     }
     75 }