1 /* 2 * Copyright (C) 2010 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 17 package com.example.android.apis.app; 18 19 import com.example.android.apis.R; 20 21 import android.app.Activity; 22 import android.app.Fragment; 23 import android.app.FragmentTransaction; 24 import android.os.Bundle; 25 import android.view.LayoutInflater; 26 import android.view.View; 27 import android.view.ViewGroup; 28 import android.view.View.OnClickListener; 29 import android.widget.Button; 30 import android.widget.TextView; 31 32 public class FragmentStack extends Activity { 33 int mStackLevel = 1; 34 35 @Override onCreate(Bundle savedInstanceState)36 protected void onCreate(Bundle savedInstanceState) { 37 super.onCreate(savedInstanceState); 38 setContentView(R.layout.fragment_stack); 39 40 // Watch for button clicks. 41 Button button = (Button)findViewById(R.id.new_fragment); 42 button.setOnClickListener(new OnClickListener() { 43 public void onClick(View v) { 44 addFragmentToStack(); 45 } 46 }); 47 button = (Button)findViewById(R.id.delete_fragment); 48 button.setOnClickListener(new OnClickListener() { 49 public void onClick(View v) { 50 getFragmentManager().popBackStack(); 51 } 52 }); 53 54 if (savedInstanceState == null) { 55 // Do first time initialization -- add initial fragment. 56 Fragment newFragment = CountingFragment.newInstance(mStackLevel); 57 FragmentTransaction ft = getFragmentManager().beginTransaction(); 58 ft.add(R.id.simple_fragment, newFragment).commit(); 59 } else { 60 mStackLevel = savedInstanceState.getInt("level"); 61 } 62 } 63 64 @Override onSaveInstanceState(Bundle outState)65 public void onSaveInstanceState(Bundle outState) { 66 super.onSaveInstanceState(outState); 67 outState.putInt("level", mStackLevel); 68 } 69 70 //BEGIN_INCLUDE(add_stack) addFragmentToStack()71 void addFragmentToStack() { 72 mStackLevel++; 73 74 // Instantiate a new fragment. 75 Fragment newFragment = CountingFragment.newInstance(mStackLevel); 76 77 // Add the fragment to the activity, pushing this transaction 78 // on to the back stack. 79 FragmentTransaction ft = getFragmentManager().beginTransaction(); 80 ft.replace(R.id.simple_fragment, newFragment); 81 ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN); 82 ft.addToBackStack(null); 83 ft.commit(); 84 } 85 //END_INCLUDE(add_stack) 86 87 //BEGIN_INCLUDE(fragment) 88 public static class CountingFragment extends Fragment { 89 int mNum; 90 91 /** 92 * Create a new instance of CountingFragment, providing "num" 93 * as an argument. 94 */ newInstance(int num)95 static CountingFragment newInstance(int num) { 96 CountingFragment f = new CountingFragment(); 97 98 // Supply num input as an argument. 99 Bundle args = new Bundle(); 100 args.putInt("num", num); 101 f.setArguments(args); 102 103 return f; 104 } 105 106 /** 107 * When creating, retrieve this instance's number from its arguments. 108 */ 109 @Override onCreate(Bundle savedInstanceState)110 public void onCreate(Bundle savedInstanceState) { 111 super.onCreate(savedInstanceState); 112 mNum = getArguments() != null ? getArguments().getInt("num") : 1; 113 } 114 115 /** 116 * The Fragment's UI is just a simple text view showing its 117 * instance number. 118 */ 119 @Override onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)120 public View onCreateView(LayoutInflater inflater, ViewGroup container, 121 Bundle savedInstanceState) { 122 View v = inflater.inflate(R.layout.hello_world, container, false); 123 View tv = v.findViewById(R.id.text); 124 ((TextView)tv).setText("Fragment #" + mNum); 125 tv.setBackgroundDrawable(getResources().getDrawable(android.R.drawable.gallery_thumb)); 126 return v; 127 } 128 } 129 //END_INCLUDE(fragment) 130 } 131