FragmentStackFragmentSupport.java revision e2104f4b5c8e3ad63570306a25e61502dfe4c418 
1/*
2 * Copyright (C) 2012 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.support.v4.app.Fragment;
21import android.support.v4.app.FragmentManager;
22import android.support.v4.app.FragmentTransaction;
23import android.view.LayoutInflater;
24import android.view.View;
25import android.view.ViewGroup;
26import android.view.View.OnClickListener;
27import android.widget.Button;
28
29import com.example.android.supportv4.R;
30
31public class FragmentStackFragmentSupport extends Fragment {
32    int mStackLevel = 1;
33
34    @Override
35    public void onCreate(Bundle savedInstanceState) {
36        super.onCreate(savedInstanceState);
37
38        if (savedInstanceState == null) {
39            // Do first time initialization -- add initial fragment.
40            Fragment newFragment = FragmentStackSupport.CountingFragment.newInstance(mStackLevel);
41            FragmentTransaction ft = getChildFragmentManager().beginTransaction();
42            ft.add(R.id.simple_fragment, newFragment).commit();
43        } else {
44            mStackLevel = savedInstanceState.getInt("level");
45        }
46    }
47
48    @Override
49    public View onCreateView(LayoutInflater inflater, ViewGroup container,
50            Bundle savedInstanceState) {
51        View v = inflater.inflate(R.layout.fragment_stack, container, false);
52
53        // Watch for button clicks.
54        Button button = (Button)v.findViewById(R.id.new_fragment);
55        button.setOnClickListener(new OnClickListener() {
56            @Override
57            public void onClick(View v) {
58                addFragmentToStack();
59            }
60        });
61        button = (Button)v.findViewById(R.id.delete_fragment);
62        button.setOnClickListener(new OnClickListener() {
63            @Override
64            public void onClick(View v) {
65                getChildFragmentManager().popBackStack();
66            }
67        });
68        button = (Button)v.findViewById(R.id.home);
69        button.setOnClickListener(new OnClickListener() {
70            @Override
71            public void onClick(View v) {
72                // If there is a back stack, pop it all.
73                FragmentManager fm = getChildFragmentManager();
74                if (fm.getBackStackEntryCount() > 0) {
75                    fm.popBackStack(fm.getBackStackEntryAt(0).getId(),
76                            FragmentManager.POP_BACK_STACK_INCLUSIVE);
77                }
78            }
79        });
80
81        return v;
82    }
83
84    @Override
85    public void onSaveInstanceState(Bundle outState) {
86        super.onSaveInstanceState(outState);
87        outState.putInt("level", mStackLevel);
88    }
89
90    void addFragmentToStack() {
91        mStackLevel++;
92
93        // Instantiate a new fragment.
94        Fragment newFragment = FragmentStackSupport.CountingFragment.newInstance(mStackLevel);
95
96        // Add the fragment to the activity, pushing this transaction
97        // on to the back stack.
98        FragmentTransaction ft = getChildFragmentManager().beginTransaction();
99        ft.replace(R.id.simple_fragment, newFragment);
100        ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
101        ft.addToBackStack(null);
102        ft.commit();
103    }
104}
105