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