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.FragmentManager; 24 import android.app.FragmentTransaction; 25 import android.os.Bundle; 26 import android.view.LayoutInflater; 27 import android.view.View; 28 import android.view.ViewGroup; 29 import android.view.View.OnClickListener; 30 import android.widget.Button; 31 import android.widget.TextView; 32 33 /** 34 * Demonstration of hiding and showing fragments. 35 */ 36 public class FragmentHideShow extends Activity { 37 38 @Override onCreate(Bundle savedInstanceState)39 protected void onCreate(Bundle savedInstanceState) { 40 super.onCreate(savedInstanceState); 41 setContentView(R.layout.fragment_hide_show); 42 43 // The content view embeds two fragments; now retrieve them and attach 44 // their "hide" button. 45 FragmentManager fm = getFragmentManager(); 46 Fragment fragment1 = fm.findFragmentById(R.id.fragment1); 47 addShowHideListener(R.id.frag1hide, fragment1); 48 final Button button1 = (Button)findViewById(R.id.frag1hide); 49 button1.setText(fragment1.isHidden() ? "Show" : "Hide"); 50 Fragment fragment2 = fm.findFragmentById(R.id.fragment2); 51 addShowHideListener(R.id.frag2hide, fragment2); 52 final Button button2 = (Button)findViewById(R.id.frag2hide); 53 button2.setText(fragment2.isHidden() ? "Show" : "Hide"); 54 } 55 addShowHideListener(int buttonId, final Fragment fragment)56 void addShowHideListener(int buttonId, final Fragment fragment) { 57 final Button button = (Button)findViewById(buttonId); 58 button.setOnClickListener(new OnClickListener() { 59 public void onClick(View v) { 60 FragmentTransaction ft = getFragmentManager().beginTransaction(); 61 ft.setCustomAnimations(android.R.animator.fade_in, 62 android.R.animator.fade_out); 63 if (fragment.isHidden()) { 64 ft.show(fragment); 65 button.setText("Hide"); 66 } else { 67 ft.hide(fragment); 68 button.setText("Show"); 69 } 70 ft.commit(); 71 } 72 }); 73 } 74 75 public static class FirstFragment extends Fragment { 76 TextView mTextView; 77 78 @Override onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)79 public View onCreateView(LayoutInflater inflater, ViewGroup container, 80 Bundle savedInstanceState) { 81 View v = inflater.inflate(R.layout.labeled_text_edit, container, false); 82 View tv = v.findViewById(R.id.msg); 83 ((TextView)tv).setText("The fragment saves and restores this text."); 84 85 // Retrieve the text editor, and restore the last saved state if needed. 86 mTextView = (TextView)v.findViewById(R.id.saved); 87 if (savedInstanceState != null) { 88 mTextView.setText(savedInstanceState.getCharSequence("text")); 89 } 90 return v; 91 } 92 93 @Override onSaveInstanceState(Bundle outState)94 public void onSaveInstanceState(Bundle outState) { 95 super.onSaveInstanceState(outState); 96 97 // Remember the current text, to restore if we later restart. 98 outState.putCharSequence("text", mTextView.getText()); 99 } 100 } 101 102 public static class SecondFragment extends Fragment { 103 104 @Override onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)105 public View onCreateView(LayoutInflater inflater, ViewGroup container, 106 Bundle savedInstanceState) { 107 View v = inflater.inflate(R.layout.labeled_text_edit, container, false); 108 View tv = v.findViewById(R.id.msg); 109 ((TextView)tv).setText("The TextView saves and restores this text."); 110 111 // Retrieve the text editor and tell it to save and restore its state. 112 // Note that you will often set this in the layout XML, but since 113 // we are sharing our layout with the other fragment we will customize 114 // it here. 115 ((TextView)v.findViewById(R.id.saved)).setSaveEnabled(true); 116 return v; 117 } 118 } 119 } 120