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 /** 35 * Demonstration of hiding and showing fragments. 36 */ 37 public class FragmentHideShowSupport extends FragmentActivity { 38 39 @Override onCreate(Bundle savedInstanceState)40 protected void onCreate(Bundle savedInstanceState) { 41 super.onCreate(savedInstanceState); 42 setContentView(R.layout.fragment_hide_show_support); 43 44 // The content view embeds two fragments; now retrieve them and attach 45 // their "hide" button. 46 FragmentManager fm = getSupportFragmentManager(); 47 Fragment fragment1 = fm.findFragmentById(R.id.fragment1); 48 addShowHideListener(R.id.frag1hide, fragment1); 49 final Button button1 = (Button)findViewById(R.id.frag1hide); 50 button1.setText(fragment1.isHidden() ? "Show" : "Hide"); 51 Fragment fragment2 = fm.findFragmentById(R.id.fragment2); 52 addShowHideListener(R.id.frag2hide, fragment2); 53 final Button button2 = (Button)findViewById(R.id.frag2hide); 54 button2.setText(fragment2.isHidden() ? "Show" : "Hide"); 55 } 56 addShowHideListener(int buttonId, final Fragment fragment)57 void addShowHideListener(int buttonId, final Fragment fragment) { 58 final Button button = (Button)findViewById(buttonId); 59 button.setOnClickListener(new OnClickListener() { 60 public void onClick(View v) { 61 FragmentTransaction ft = getSupportFragmentManager().beginTransaction(); 62 ft.setCustomAnimations(android.R.anim.fade_in, 63 android.R.anim.fade_out); 64 if (fragment.isHidden()) { 65 ft.show(fragment); 66 button.setText("Hide"); 67 } else { 68 ft.hide(fragment); 69 button.setText("Show"); 70 } 71 ft.commit(); 72 } 73 }); 74 } 75 76 public static class FirstFragment extends Fragment { 77 TextView mTextView; 78 79 @Override onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)80 public View onCreateView(LayoutInflater inflater, ViewGroup container, 81 Bundle savedInstanceState) { 82 View v = inflater.inflate(R.layout.labeled_text_edit, container, false); 83 View tv = v.findViewById(R.id.msg); 84 ((TextView)tv).setText("The fragment saves and restores this text."); 85 86 // Retrieve the text editor, and restore the last saved state if needed. 87 mTextView = (TextView)v.findViewById(R.id.saved); 88 if (savedInstanceState != null) { 89 mTextView.setText(savedInstanceState.getCharSequence("text")); 90 } 91 return v; 92 } 93 94 @Override onSaveInstanceState(Bundle outState)95 public void onSaveInstanceState(Bundle outState) { 96 super.onSaveInstanceState(outState); 97 98 // Remember the current text, to restore if we later restart. 99 outState.putCharSequence("text", mTextView.getText()); 100 } 101 } 102 103 public static class SecondFragment extends Fragment { 104 105 @Override onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)106 public View onCreateView(LayoutInflater inflater, ViewGroup container, 107 Bundle savedInstanceState) { 108 View v = inflater.inflate(R.layout.labeled_text_edit, container, false); 109 View tv = v.findViewById(R.id.msg); 110 ((TextView)tv).setText("The TextView saves and restores this text."); 111 112 // Retrieve the text editor and tell it to save and restore its state. 113 // Note that you will often set this in the layout XML, but since 114 // we are sharing our layout with the other fragment we will customize 115 // it here. 116 ((TextView)v.findViewById(R.id.saved)).setSaveEnabled(true); 117 return v; 118 } 119 } 120 } 121