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 android.os.Bundle;
20import android.view.LayoutInflater;
21import android.view.View;
22import android.view.View.OnClickListener;
23import android.view.ViewGroup;
24import android.widget.Button;
25import android.widget.TextView;
26
27import androidx.fragment.app.Fragment;
28import androidx.fragment.app.FragmentActivity;
29import androidx.fragment.app.FragmentManager;
30import androidx.fragment.app.FragmentTransaction;
31
32import com.example.android.supportv4.R;
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        Fragment fragment1 = fm.findFragmentById(R.id.fragment1);
48        addShowHideListener(R.id.frag1hide, fragment1);
49        final Button button1 = (Button)findViewById(R.id.frag1hide);
50        button1.setText(fragment1.isHidden() ? "Show" : "Hide");
51        Fragment fragment2 = fm.findFragmentById(R.id.fragment2);
52        addShowHideListener(R.id.frag2hide, fragment2);
53        final Button button2 = (Button)findViewById(R.id.frag2hide);
54        button2.setText(fragment2.isHidden() ? "Show" : "Hide");
55    }
56
57    void addShowHideListener(int buttonId, final Fragment fragment) {
58        final Button button = (Button)findViewById(buttonId);
59        button.setOnClickListener(new OnClickListener() {
60            @Override
61            public void onClick(View v) {
62                FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
63                ft.setCustomAnimations(android.R.anim.fade_in,
64                        android.R.anim.fade_out);
65                if (fragment.isHidden()) {
66                    ft.show(fragment);
67                    button.setText("Hide");
68                } else {
69                    ft.hide(fragment);
70                    button.setText("Show");
71                }
72                ft.commit();
73            }
74        });
75    }
76
77    public static class FirstFragment extends Fragment {
78        TextView mTextView;
79
80        @Override
81        public View onCreateView(LayoutInflater inflater, ViewGroup container,
82                Bundle savedInstanceState) {
83            View v = inflater.inflate(R.layout.labeled_text_edit, container, false);
84            View tv = v.findViewById(R.id.msg);
85            ((TextView)tv).setText("The fragment saves and restores this text.");
86
87            // Retrieve the text editor, and restore the last saved state if needed.
88            mTextView = (TextView)v.findViewById(R.id.saved);
89            if (savedInstanceState != null) {
90                mTextView.setText(savedInstanceState.getCharSequence("text"));
91            }
92            return v;
93        }
94
95        @Override
96        public void onSaveInstanceState(Bundle outState) {
97            super.onSaveInstanceState(outState);
98
99            // Remember the current text, to restore if we later restart.
100            outState.putCharSequence("text", mTextView.getText());
101        }
102    }
103
104    public static class SecondFragment extends Fragment {
105
106        @Override
107        public View onCreateView(LayoutInflater inflater, ViewGroup container,
108                Bundle savedInstanceState) {
109            View v = inflater.inflate(R.layout.labeled_text_edit, container, false);
110            View tv = v.findViewById(R.id.msg);
111            ((TextView)tv).setText("The TextView saves and restores this text.");
112
113            // Retrieve the text editor and tell it to save and restore its state.
114            // Note that you will often set this in the layout XML, but since
115            // we are sharing our layout with the other fragment we will customize
116            // it here.
117            ((TextView)v.findViewById(R.id.saved)).setSaveEnabled(true);
118            return v;
119        }
120    }
121}
122