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 onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)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 onStart()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 updateArticleView(int position)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 onSaveInstanceState(Bundle outState)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 }