1/*
2 * Copyright (C) 2016 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.android.settings.display;
18
19import com.android.settings.R;
20
21import android.content.Context;
22import android.content.Intent;
23import android.content.pm.PackageManager;
24import android.content.pm.ResolveInfo;
25import android.graphics.drawable.Drawable;
26import android.util.AttributeSet;
27import android.view.View;
28import android.view.ViewGroup;
29import android.widget.ArrayAdapter;
30import android.widget.GridView;
31import android.widget.ImageView;
32
33import java.util.ArrayList;
34import java.util.Collections;
35import java.util.List;
36
37public class AppGridView extends GridView {
38    public AppGridView(Context context) {
39        this(context, null);
40    }
41
42    public AppGridView(Context context, AttributeSet attrs) {
43        this(context, attrs, 0);
44    }
45
46    public AppGridView(Context context, AttributeSet attrs, int defStyleAttr) {
47        this(context, attrs, defStyleAttr, 0);
48    }
49
50    public AppGridView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleResId) {
51        super(context, attrs, defStyleAttr, defStyleResId);
52
53        setNumColumns(AUTO_FIT);
54
55        final int columnWidth = getResources().getDimensionPixelSize(
56                R.dimen.screen_zoom_preview_app_icon_width);
57        setColumnWidth(columnWidth);
58
59        setAdapter(new AppsAdapter(context, R.layout.screen_zoom_preview_app_icon,
60                android.R.id.text1, android.R.id.icon1));
61    }
62
63    /**
64     * Loads application labels and icons.
65     */
66    private static class AppsAdapter extends ArrayAdapter<ActivityEntry> {
67        private final PackageManager mPackageManager;
68        private final int mIconResId;
69
70        public AppsAdapter(Context context, int layout, int textResId, int iconResId) {
71            super(context, layout, textResId);
72
73            mIconResId = iconResId;
74            mPackageManager = context.getPackageManager();
75
76            loadAllApps();
77        }
78
79        @Override
80        public View getView(int position, View convertView, ViewGroup parent) {
81            final View view = super.getView(position, convertView, parent);
82            final ActivityEntry entry = getItem(position);
83            final ImageView iconView = (ImageView) view.findViewById(mIconResId);
84            final Drawable icon = entry.info.loadIcon(mPackageManager);
85            iconView.setImageDrawable(icon);
86            return view;
87        }
88
89        @Override
90        public boolean hasStableIds() {
91            return true;
92        }
93
94        @Override
95        public long getItemId(int position) {
96            return position;
97        }
98
99        @Override
100        public boolean isEnabled(int position) {
101            return false;
102        }
103
104        private void loadAllApps() {
105            final Intent mainIntent = new Intent(Intent.ACTION_MAIN, null);
106            mainIntent.addCategory(Intent.CATEGORY_LAUNCHER);
107
108            final PackageManager pm = mPackageManager;
109            final ArrayList<ActivityEntry> results = new ArrayList<>();
110            final List<ResolveInfo> infos = pm.queryIntentActivities(mainIntent, 0);
111            for (ResolveInfo info : infos) {
112                final CharSequence label = info.loadLabel(pm);
113                if (label != null) {
114                    results.add(new ActivityEntry(info, label.toString()));
115                }
116            }
117
118            Collections.sort(results);
119
120            addAll(results);
121        }
122    }
123
124    /**
125     * Class used for caching the activity label and icon.
126     */
127    private static class ActivityEntry implements Comparable<ActivityEntry> {
128        public final ResolveInfo info;
129        public final String label;
130
131        public ActivityEntry(ResolveInfo info, String label) {
132            this.info = info;
133            this.label = label;
134        }
135
136        @Override
137        public int compareTo(ActivityEntry entry) {
138            return label.compareToIgnoreCase(entry.label);
139        }
140
141        @Override
142        public String toString() {
143            return label;
144        }
145    }
146}
147