1 /* 2 * Copyright (C) 2011 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.supportv4.app; 18 19 import com.example.android.supportv4.R; 20 21 import android.support.v4.app.Fragment; 22 import android.support.v4.app.FragmentActivity; 23 import android.support.v4.app.FragmentManager; 24 import android.support.v4.app.FragmentTransaction; 25 26 import android.os.Bundle; 27 import android.view.LayoutInflater; 28 import android.view.View; 29 import android.view.ViewGroup; 30 import android.view.View.OnClickListener; 31 import android.widget.Button; 32 import android.widget.TextView; 33 34 public class FragmentStackSupport extends FragmentActivity { 35 int mStackLevel = 1; 36 37 @Override onCreate(Bundle savedInstanceState)38 protected void onCreate(Bundle savedInstanceState) { 39 super.onCreate(savedInstanceState); 40 setContentView(R.layout.fragment_stack); 41 42 // Watch for button clicks. 43 Button button = (Button)findViewById(R.id.new_fragment); 44 button.setOnClickListener(new OnClickListener() { 45 public void onClick(View v) { 46 addFragmentToStack(); 47 } 48 }); 49 button = (Button)findViewById(R.id.home); 50 button.setOnClickListener(new OnClickListener() { 51 public void onClick(View v) { 52 // If there is a back stack, pop it all. 53 FragmentManager fm = getSupportFragmentManager(); 54 if (fm.getBackStackEntryCount() > 0) { 55 fm.popBackStack(fm.getBackStackEntryAt(0).getId(), 56 FragmentManager.POP_BACK_STACK_INCLUSIVE); 57 } 58 } 59 }); 60 61 if (savedInstanceState == null) { 62 // Do first time initialization -- add initial fragment. 63 Fragment newFragment = CountingFragment.newInstance(mStackLevel); 64 FragmentTransaction ft = getSupportFragmentManager().beginTransaction(); 65 ft.add(R.id.simple_fragment, newFragment).commit(); 66 } else { 67 mStackLevel = savedInstanceState.getInt("level"); 68 } 69 } 70 71 @Override onSaveInstanceState(Bundle outState)72 public void onSaveInstanceState(Bundle outState) { 73 super.onSaveInstanceState(outState); 74 outState.putInt("level", mStackLevel); 75 } 76 77 //BEGIN_INCLUDE(add_stack) addFragmentToStack()78 void addFragmentToStack() { 79 mStackLevel++; 80 81 // Instantiate a new fragment. 82 Fragment newFragment = CountingFragment.newInstance(mStackLevel); 83 84 // Add the fragment to the activity, pushing this transaction 85 // on to the back stack. 86 FragmentTransaction ft = getSupportFragmentManager().beginTransaction(); 87 ft.replace(R.id.simple_fragment, newFragment); 88 ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN); 89 ft.addToBackStack(null); 90 ft.commit(); 91 } 92 //END_INCLUDE(add_stack) 93 94 //BEGIN_INCLUDE(fragment) 95 public static class CountingFragment extends Fragment { 96 int mNum; 97 98 /** 99 * Create a new instance of CountingFragment, providing "num" 100 * as an argument. 101 */ newInstance(int num)102 static CountingFragment newInstance(int num) { 103 CountingFragment f = new CountingFragment(); 104 105 // Supply num input as an argument. 106 Bundle args = new Bundle(); 107 args.putInt("num", num); 108 f.setArguments(args); 109 110 return f; 111 } 112 113 /** 114 * When creating, retrieve this instance's number from its arguments. 115 */ 116 @Override onCreate(Bundle savedInstanceState)117 public void onCreate(Bundle savedInstanceState) { 118 super.onCreate(savedInstanceState); 119 mNum = getArguments() != null ? getArguments().getInt("num") : 1; 120 } 121 122 /** 123 * The Fragment's UI is just a simple text view showing its 124 * instance number. 125 */ 126 @Override onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)127 public View onCreateView(LayoutInflater inflater, ViewGroup container, 128 Bundle savedInstanceState) { 129 View v = inflater.inflate(R.layout.hello_world, container, false); 130 View tv = v.findViewById(R.id.text); 131 ((TextView)tv).setText("Fragment #" + mNum); 132 tv.setBackgroundDrawable(getResources().getDrawable(android.R.drawable.gallery_thumb)); 133 return v; 134 } 135 } 136 //END_INCLUDE(fragment) 137 } 138