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 
17 package com.android.settings.display;
18 
19 import com.android.settings.R;
20 
21 import android.content.Context;
22 import android.content.Intent;
23 import android.content.pm.PackageManager;
24 import android.content.pm.ResolveInfo;
25 import android.graphics.drawable.Drawable;
26 import android.util.AttributeSet;
27 import android.view.View;
28 import android.view.ViewGroup;
29 import android.widget.ArrayAdapter;
30 import android.widget.GridView;
31 import android.widget.ImageView;
32 
33 import java.util.ArrayList;
34 import java.util.Collections;
35 import java.util.List;
36 
37 public class AppGridView extends GridView {
AppGridView(Context context)38     public AppGridView(Context context) {
39         this(context, null);
40     }
41 
AppGridView(Context context, AttributeSet attrs)42     public AppGridView(Context context, AttributeSet attrs) {
43         this(context, attrs, 0);
44     }
45 
AppGridView(Context context, AttributeSet attrs, int defStyleAttr)46     public AppGridView(Context context, AttributeSet attrs, int defStyleAttr) {
47         this(context, attrs, defStyleAttr, 0);
48     }
49 
AppGridView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleResId)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 
AppsAdapter(Context context, int layout, int textResId, int iconResId)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
getView(int position, View convertView, ViewGroup parent)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
hasStableIds()90         public boolean hasStableIds() {
91             return true;
92         }
93 
94         @Override
getItemId(int position)95         public long getItemId(int position) {
96             return position;
97         }
98 
99         @Override
isEnabled(int position)100         public boolean isEnabled(int position) {
101             return false;
102         }
103 
loadAllApps()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 
ActivityEntry(ResolveInfo info, String label)131         public ActivityEntry(ResolveInfo info, String label) {
132             this.info = info;
133             this.label = label;
134         }
135 
136         @Override
compareTo(ActivityEntry entry)137         public int compareTo(ActivityEntry entry) {
138             return label.compareToIgnoreCase(entry.label);
139         }
140 
141         @Override
toString()142         public String toString() {
143             return label;
144         }
145     }
146 }
147