FragmentHideShowSupport.java revision c644c91b91b83a6b400a57b02671f4ef7b7a810b 
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
17package com.example.android.supportv4.app;
18
19import com.example.android.supportv4.R;
20
21import android.support.v4.app.Fragment;
22import android.support.v4.app.FragmentActivity;
23import android.support.v4.app.FragmentManager;
24import android.support.v4.app.FragmentTransaction;
25
26import android.os.Bundle;
27import android.view.LayoutInflater;
28import android.view.View;
29import android.view.ViewGroup;
30import android.view.View.OnClickListener;
31import android.widget.Button;
32import android.widget.TextView;
33
34/**
35 * Demonstration of hiding and showing fragments.
36 */
37public class FragmentHideShowSupport extends FragmentActivity {
38
39    @Override
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
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
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
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
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