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 addShowHideListener(R.id.frag1hide, fm.findFragmentById(R.id.fragment1)); 47 addShowHideListener(R.id.frag2hide, fm.findFragmentById(R.id.fragment2)); 48 } 49 addShowHideListener(int buttonId, final Fragment fragment)50 void addShowHideListener(int buttonId, final Fragment fragment) { 51 final Button button = (Button)findViewById(buttonId); 52 button.setOnClickListener(new OnClickListener() { 53 public void onClick(View v) { 54 FragmentTransaction ft = getFragmentManager().beginTransaction(); 55 ft.setCustomAnimations(android.R.animator.fade_in, 56 android.R.animator.fade_out); 57 if (fragment.isHidden()) { 58 ft.show(fragment); 59 button.setText("Hide"); 60 } else { 61 ft.hide(fragment); 62 button.setText("Show"); 63 } 64 ft.commit(); 65 } 66 }); 67 } 68 69 public static class FirstFragment extends Fragment { 70 TextView mTextView; 71 72 @Override onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)73 public View onCreateView(LayoutInflater inflater, ViewGroup container, 74 Bundle savedInstanceState) { 75 View v = inflater.inflate(R.layout.labeled_text_edit, container, false); 76 View tv = v.findViewById(R.id.msg); 77 ((TextView)tv).setText("The fragment saves and restores this text."); 78 79 // Retrieve the text editor, and restore the last saved state if needed. 80 mTextView = (TextView)v.findViewById(R.id.saved); 81 if (savedInstanceState != null) { 82 mTextView.setText(savedInstanceState.getCharSequence("text")); 83 } 84 return v; 85 } 86 87 @Override onSaveInstanceState(Bundle outState)88 public void onSaveInstanceState(Bundle outState) { 89 super.onSaveInstanceState(outState); 90 91 // Remember the current text, to restore if we later restart. 92 outState.putCharSequence("text", mTextView.getText()); 93 } 94 } 95 96 public static class SecondFragment extends Fragment { 97 98 @Override onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)99 public View onCreateView(LayoutInflater inflater, ViewGroup container, 100 Bundle savedInstanceState) { 101 View v = inflater.inflate(R.layout.labeled_text_edit, container, false); 102 View tv = v.findViewById(R.id.msg); 103 ((TextView)tv).setText("The TextView saves and restores this text."); 104 105 // Retrieve the text editor and tell it to save and restore its state. 106 // Note that you will often set this in the layout XML, but since 107 // we are sharing our layout with the other fragment we will customize 108 // it here. 109 ((TextView)v.findViewById(R.id.saved)).setSaveEnabled(true); 110 return v; 111 } 112 } 113 } 114