LauncherApplication.java revision 325dc23624160689e59fbac708cf6f222b20d025 
1/*
2 * Copyright (C) 2008 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.Application;
20import android.app.SearchManager;
21import android.content.ContentResolver;
22import android.content.Context;
23import android.content.Intent;
24import android.content.IntentFilter;
25import android.content.res.Configuration;
26import android.database.ContentObserver;
27import android.os.Handler;
28
29import com.android.launcher3.R;
30
31import java.lang.ref.WeakReference;
32
33public class LauncherApplication extends Application {
34    private LauncherModel mModel;
35    private IconCache mIconCache;
36    private WidgetPreviewLoader.CacheDb mWidgetPreviewCacheDb;
37    private static boolean sIsScreenLarge;
38    private static float sScreenDensity;
39    private static int sLongPressTimeout = 300;
40    private static final String sSharedPreferencesKey = "com.android.launcher3.prefs";
41    WeakReference<LauncherProvider> mLauncherProvider;
42
43    @Override
44    public void onCreate() {
45        super.onCreate();
46
47        // set sIsScreenXLarge and sScreenDensity *before* creating icon cache
48        sIsScreenLarge = getResources().getBoolean(R.bool.is_large_screen);
49        sScreenDensity = getResources().getDisplayMetrics().density;
50
51        mWidgetPreviewCacheDb = new WidgetPreviewLoader.CacheDb(this);
52        mIconCache = new IconCache(this);
53        mModel = new LauncherModel(this, mIconCache);
54
55        // Register intent receivers
56        IntentFilter filter = new IntentFilter(Intent.ACTION_PACKAGE_ADDED);
57        filter.addAction(Intent.ACTION_PACKAGE_REMOVED);
58        filter.addAction(Intent.ACTION_PACKAGE_CHANGED);
59        filter.addDataScheme("package");
60        registerReceiver(mModel, filter);
61        filter = new IntentFilter();
62        filter.addAction(Intent.ACTION_EXTERNAL_APPLICATIONS_AVAILABLE);
63        filter.addAction(Intent.ACTION_EXTERNAL_APPLICATIONS_UNAVAILABLE);
64        filter.addAction(Intent.ACTION_LOCALE_CHANGED);
65        filter.addAction(Intent.ACTION_CONFIGURATION_CHANGED);
66        registerReceiver(mModel, filter);
67        filter = new IntentFilter();
68        filter.addAction(SearchManager.INTENT_GLOBAL_SEARCH_ACTIVITY_CHANGED);
69        registerReceiver(mModel, filter);
70        filter = new IntentFilter();
71        filter.addAction(SearchManager.INTENT_ACTION_SEARCHABLES_CHANGED);
72        registerReceiver(mModel, filter);
73
74        // Register for changes to the favorites
75        ContentResolver resolver = getContentResolver();
76        resolver.registerContentObserver(LauncherSettings.Favorites.CONTENT_URI, true,
77                mFavoritesObserver);
78    }
79
80    /**
81     * There's no guarantee that this function is ever called.
82     */
83    @Override
84    public void onTerminate() {
85        super.onTerminate();
86
87        unregisterReceiver(mModel);
88
89        ContentResolver resolver = getContentResolver();
90        resolver.unregisterContentObserver(mFavoritesObserver);
91    }
92
93    /**
94     * Receives notifications whenever the user favorites have changed.
95     */
96    private final ContentObserver mFavoritesObserver = new ContentObserver(new Handler()) {
97        @Override
98        public void onChange(boolean selfChange) {
99            // If the database has ever changed, then we really need to force a reload of the
100            // workspace on the next load
101            mModel.resetLoadedState(false, true);
102            mModel.startLoaderFromBackground();
103        }
104    };
105
106    LauncherModel setLauncher(Launcher launcher) {
107        mModel.initialize(launcher);
108        return mModel;
109    }
110
111    IconCache getIconCache() {
112        return mIconCache;
113    }
114
115    LauncherModel getModel() {
116        return mModel;
117    }
118
119    WidgetPreviewLoader.CacheDb getWidgetPreviewCacheDb() {
120        return mWidgetPreviewCacheDb;
121    }
122
123   void setLauncherProvider(LauncherProvider provider) {
124        mLauncherProvider = new WeakReference<LauncherProvider>(provider);
125    }
126
127    LauncherProvider getLauncherProvider() {
128        return mLauncherProvider.get();
129    }
130
131    public static String getSharedPreferencesKey() {
132        return sSharedPreferencesKey;
133    }
134
135    public static boolean isScreenLarge() {
136        return sIsScreenLarge;
137    }
138
139    public static boolean isScreenLandscape(Context context) {
140        return context.getResources().getConfiguration().orientation ==
141            Configuration.ORIENTATION_LANDSCAPE;
142    }
143
144    public static float getScreenDensity() {
145        return sScreenDensity;
146    }
147
148    public static int getLongPressTimeout() {
149        return sLongPressTimeout;
150    }
151}
152