LauncherAppState.java revision cc8befac3550c81d04ea206c170adae36c9a6c93 
1/*
2 * Copyright (C) 2013 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.launcher3;
18
19import android.app.SearchManager;
20import android.content.ContentResolver;
21import android.content.Context;
22import android.content.Intent;
23import android.content.IntentFilter;
24import android.content.res.Configuration;
25import android.database.ContentObserver;
26import android.os.Handler;
27
28import java.lang.ref.WeakReference;
29
30public class LauncherAppState {
31    private Context mContext;
32    private LauncherModel mModel;
33    private IconCache mIconCache;
34    private WidgetPreviewLoader.CacheDb mWidgetPreviewCacheDb;
35    private static boolean sIsScreenLarge;
36    private static float sScreenDensity;
37    private static int sLongPressTimeout = 300;
38    private static final String sSharedPreferencesKey = "com.android.launcher3.prefs";
39    WeakReference<LauncherProvider> mLauncherProvider;
40
41    private static LauncherAppState INSTANCE;
42
43    private static final LauncherAppState INSTANCE = new LauncherAppState();
44
45    public static LauncherAppState getInstance() {
46        return INSTANCE;
47    }
48
49    public static void init(Context context) {
50        INSTANCE.initialize(context);
51    }
52
53    public Context getContext() {
54        return mContext;
55    }
56
57    private LauncherAppState() { }
58
59    private void initialize(Context context) {
60        mContext = context;
61
62        // set sIsScreenXLarge and sScreenDensity *before* creating icon cache
63        sIsScreenLarge = context.getResources().getBoolean(R.bool.is_large_screen);
64        sScreenDensity = context.getResources().getDisplayMetrics().density;
65
66        mWidgetPreviewCacheDb = new WidgetPreviewLoader.CacheDb(context);
67        mIconCache = new IconCache(context);
68        mModel = new LauncherModel(context, mIconCache);
69
70        // Register intent receivers
71        IntentFilter filter = new IntentFilter(Intent.ACTION_PACKAGE_ADDED);
72        filter.addAction(Intent.ACTION_PACKAGE_REMOVED);
73        filter.addAction(Intent.ACTION_PACKAGE_CHANGED);
74        filter.addDataScheme("package");
75        context.registerReceiver(mModel, filter);
76        filter = new IntentFilter();
77        filter.addAction(Intent.ACTION_EXTERNAL_APPLICATIONS_AVAILABLE);
78        filter.addAction(Intent.ACTION_EXTERNAL_APPLICATIONS_UNAVAILABLE);
79        filter.addAction(Intent.ACTION_LOCALE_CHANGED);
80        filter.addAction(Intent.ACTION_CONFIGURATION_CHANGED);
81        context.registerReceiver(mModel, filter);
82        filter = new IntentFilter();
83        filter.addAction(SearchManager.INTENT_GLOBAL_SEARCH_ACTIVITY_CHANGED);
84        context.registerReceiver(mModel, filter);
85        filter = new IntentFilter();
86        filter.addAction(SearchManager.INTENT_ACTION_SEARCHABLES_CHANGED);
87        context.registerReceiver(mModel, filter);
88
89        // Register for changes to the favorites
90        ContentResolver resolver = context.getContentResolver();
91        resolver.registerContentObserver(LauncherSettings.Favorites.CONTENT_URI, true,
92                mFavoritesObserver);
93    }
94
95    /**
96     * Call from Application.onTerminate(), which is not guaranteed to ever be called.
97     */
98    public void onTerminate() {
99        mContext.unregisterReceiver(mModel);
100
101        ContentResolver resolver = mContext.getContentResolver();
102        resolver.unregisterContentObserver(mFavoritesObserver);
103    }
104
105    /**
106     * Receives notifications whenever the user favorites have changed.
107     */
108    private final ContentObserver mFavoritesObserver = new ContentObserver(new Handler()) {
109        @Override
110        public void onChange(boolean selfChange) {
111            // If the database has ever changed, then we really need to force a reload of the
112            // workspace on the next load
113            mModel.resetLoadedState(false, true);
114            mModel.startLoaderFromBackground();
115        }
116    };
117
118    LauncherModel setLauncher(Launcher launcher) {
119        mModel.initialize(launcher);
120        return mModel;
121    }
122
123    IconCache getIconCache() {
124        return mIconCache;
125    }
126
127    LauncherModel getModel() {
128        return mModel;
129    }
130
131    WidgetPreviewLoader.CacheDb getWidgetPreviewCacheDb() {
132        return mWidgetPreviewCacheDb;
133    }
134
135   void setLauncherProvider(LauncherProvider provider) {
136        mLauncherProvider = new WeakReference<LauncherProvider>(provider);
137    }
138
139    LauncherProvider getLauncherProvider() {
140        return mLauncherProvider.get();
141    }
142
143    public static String getSharedPreferencesKey() {
144        return sSharedPreferencesKey;
145    }
146
147    public static boolean isScreenLarge() {
148        return sIsScreenLarge;
149    }
150
151    public static boolean isScreenLandscape(Context context) {
152        return context.getResources().getConfiguration().orientation ==
153            Configuration.ORIENTATION_LANDSCAPE;
154    }
155
156    public static float getScreenDensity() {
157        return sScreenDensity;
158    }
159
160    public static int getLongPressTimeout() {
161        return sLongPressTimeout;
162    }
163}
164