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
34public class FragmentStackSupport extends FragmentActivity {
35    int mStackLevel = 1;
36
37    @Override
38    protected void onCreate(Bundle savedInstanceState) {
39        super.onCreate(savedInstanceState);
40        setContentView(R.layout.fragment_stack);
41
42        // Watch for button clicks.
43        Button button = (Button)findViewById(R.id.new_fragment);
44        button.setOnClickListener(new OnClickListener() {
45            public void onClick(View v) {
46                addFragmentToStack();
47            }
48        });
49        button = (Button)findViewById(R.id.home);
50        button.setOnClickListener(new OnClickListener() {
51            public void onClick(View v) {
52                // If there is a back stack, pop it all.
53                FragmentManager fm = getSupportFragmentManager();
54                if (fm.getBackStackEntryCount() > 0) {
55                    fm.popBackStack(fm.getBackStackEntryAt(0).getId(),
56                            FragmentManager.POP_BACK_STACK_INCLUSIVE);
57                }
58            }
59        });
60
61        if (savedInstanceState == null) {
62            // Do first time initialization -- add initial fragment.
63            Fragment newFragment = CountingFragment.newInstance(mStackLevel);
64            FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
65            ft.add(R.id.simple_fragment, newFragment).commit();
66        } else {
67            mStackLevel = savedInstanceState.getInt("level");
68        }
69    }
70
71    @Override
72    public void onSaveInstanceState(Bundle outState) {
73        super.onSaveInstanceState(outState);
74        outState.putInt("level", mStackLevel);
75    }
76
77//BEGIN_INCLUDE(add_stack)
78    void addFragmentToStack() {
79        mStackLevel++;
80
81        // Instantiate a new fragment.
82        Fragment newFragment = CountingFragment.newInstance(mStackLevel);
83
84        // Add the fragment to the activity, pushing this transaction
85        // on to the back stack.
86        FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
87        ft.replace(R.id.simple_fragment, newFragment);
88        ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_OPEN);
89        ft.addToBackStack(null);
90        ft.commit();
91    }
92//END_INCLUDE(add_stack)
93
94//BEGIN_INCLUDE(fragment)
95    public static class CountingFragment extends Fragment {
96        int mNum;
97
98        /**
99         * Create a new instance of CountingFragment, providing "num"
100         * as an argument.
101         */
102        static CountingFragment newInstance(int num) {
103            CountingFragment f = new CountingFragment();
104
105            // Supply num input as an argument.
106            Bundle args = new Bundle();
107            args.putInt("num", num);
108            f.setArguments(args);
109
110            return f;
111        }
112
113        /**
114         * When creating, retrieve this instance's number from its arguments.
115         */
116        @Override
117        public void onCreate(Bundle savedInstanceState) {
118            super.onCreate(savedInstanceState);
119            mNum = getArguments() != null ? getArguments().getInt("num") : 1;
120        }
121
122        /**
123         * The Fragment's UI is just a simple text view showing its
124         * instance number.
125         */
126        @Override
127        public View onCreateView(LayoutInflater inflater, ViewGroup container,
128                Bundle savedInstanceState) {
129            View v = inflater.inflate(R.layout.hello_world, container, false);
130            View tv = v.findViewById(R.id.text);
131            ((TextView)tv).setText("Fragment #" + mNum);
132            tv.setBackgroundDrawable(getResources().getDrawable(android.R.drawable.gallery_thumb));
133            return v;
134        }
135    }
136//END_INCLUDE(fragment)
137}
138