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