BrowseActivity.java revision c32f00f751eb2fa4dfaab313fa6ea4d34ccc1d83 
1/*
2 * Copyright (C) 2017 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.androidx.viewpager2;
18
19import android.app.ListActivity;
20import android.content.Intent;
21import android.content.pm.PackageManager;
22import android.content.pm.ResolveInfo;
23import android.os.Bundle;
24import android.view.View;
25import android.widget.ListView;
26import android.widget.SimpleAdapter;
27
28import java.text.Collator;
29import java.util.ArrayList;
30import java.util.Collections;
31import java.util.Comparator;
32import java.util.HashMap;
33import java.util.List;
34import java.util.Map;
35
36/**
37 * This activity lists all the activities in this application.
38 *
39 * TODO: consider pulling out into a common test / demo library (a few forks of this class around)
40 */
41public class BrowseActivity extends ListActivity {
42
43    @Override
44    public void onCreate(Bundle savedInstanceState) {
45        super.onCreate(savedInstanceState);
46
47        Intent intent = getIntent();
48        String path = intent.getStringExtra("com.example.androidx.viewpager2");
49
50        if (path == null) {
51            path = "";
52        }
53
54        setListAdapter(new SimpleAdapter(this, getData(path),
55                android.R.layout.simple_list_item_1, new String[]{"title"},
56                new int[]{android.R.id.text1}));
57        getListView().setTextFilterEnabled(true);
58    }
59
60    protected List<Map<String, Object>> getData(String prefix) {
61        List<Map<String, Object>> myData = new ArrayList<>();
62
63        Intent mainIntent = new Intent(Intent.ACTION_MAIN, null);
64        mainIntent.addCategory(Intent.CATEGORY_SAMPLE_CODE);
65
66        PackageManager pm = getPackageManager();
67        List<ResolveInfo> list = pm.queryIntentActivities(mainIntent, 0);
68
69        if (null == list) {
70            return myData;
71        }
72
73        String[] prefixPath;
74        String prefixWithSlash = prefix;
75
76        if (prefix.equals("")) {
77            prefixPath = null;
78        } else {
79            prefixPath = prefix.split("/");
80            prefixWithSlash = prefix + "/";
81        }
82
83        int len = list.size();
84
85        Map<String, Boolean> entries = new HashMap<>();
86
87        for (int i = 0; i < len; i++) {
88            ResolveInfo info = list.get(i);
89            CharSequence labelSeq = info.loadLabel(pm);
90            String label = labelSeq != null ? labelSeq.toString() : info.activityInfo.name;
91
92            if (prefixWithSlash.length() == 0 || label.startsWith(prefixWithSlash)) {
93
94                String[] labelPath = label.split("/");
95
96                String nextLabel = prefixPath == null ? labelPath[0] : labelPath[prefixPath.length];
97
98                if ((prefixPath != null ? prefixPath.length : 0) == labelPath.length - 1) {
99                    addItem(myData, nextLabel, activityIntent(
100                            info.activityInfo.applicationInfo.packageName,
101                            info.activityInfo.name));
102                } else {
103                    if (entries.get(nextLabel) == null) {
104                        addItem(myData, nextLabel, browseIntent(prefix.equals("")
105                                ? nextLabel : prefix + "/" + nextLabel));
106                        entries.put(nextLabel, true);
107                    }
108                }
109            }
110        }
111
112        Collections.sort(myData, sDisplayNameComparator);
113        return myData;
114    }
115
116    private static final Comparator<Map<String, Object>> sDisplayNameComparator =
117            new Comparator<Map<String, Object>>() {
118                final Collator mCollator = Collator.getInstance();
119
120                public int compare(Map<String, Object> map1, Map<String, Object> map2) {
121                    return mCollator.compare(map1.get("title"), map2.get("title"));
122                }
123            };
124
125    protected Intent activityIntent(String pkg, String componentName) {
126        Intent result = new Intent();
127        result.setClassName(pkg, componentName);
128        return result;
129    }
130
131    protected Intent browseIntent(String path) {
132        Intent result = new Intent();
133        result.setClass(this, BrowseActivity.class);
134        result.putExtra("com.example.androidx.viewpager2", path);
135        return result;
136    }
137
138    protected void addItem(List<Map<String, Object>> data, String name, Intent intent) {
139        Map<String, Object> temp = new HashMap<>();
140        temp.put("title", name);
141        temp.put("intent", intent);
142        data.add(temp);
143    }
144
145    @Override
146    @SuppressWarnings("unchecked")
147    protected void onListItemClick(ListView l, View v, int position, long id) {
148        Map<String, Object> map = (Map<String, Object>) l.getItemAtPosition(position);
149
150        Intent intent = new Intent((Intent) map.get("intent"));
151        intent.addCategory(Intent.CATEGORY_SAMPLE_CODE);
152        startActivity(intent);
153    }
154}
155