LauncherAppState.java revision 34c2e6cf7af328aba25c98158161dbad15ae986d 
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.*;
21import android.content.res.Configuration;
22import android.content.res.Resources;
23import android.database.ContentObserver;
24import android.os.Handler;
25import android.util.Log;
26
27import java.lang.ref.WeakReference;
28
29public class LauncherAppState implements DeviceProfile.DeviceProfileCallbacks {
30    private static final String TAG = "LauncherAppState";
31    private static final String SHARED_PREFERENCES_KEY = "com.android.launcher3.prefs";
32
33    private LauncherModel mModel;
34    private IconCache mIconCache;
35    private AppFilter mAppFilter;
36    private WidgetPreviewLoader.CacheDb mWidgetPreviewCacheDb;
37    private boolean mIsScreenLarge;
38    private float mScreenDensity;
39    private int mLongPressTimeout = 300;
40    private boolean mWallpaperChangedSinceLastCheck;
41
42    private static WeakReference<LauncherProvider> sLauncherProvider;
43    private static Context sContext;
44
45    private static LauncherAppState INSTANCE;
46
47    private DynamicGrid mDynamicGrid;
48
49    public static LauncherAppState getInstance() {
50        if (INSTANCE == null) {
51            INSTANCE = new LauncherAppState();
52        }
53        return INSTANCE;
54    }
55
56    public static LauncherAppState getInstanceNoCreate() {
57        return INSTANCE;
58    }
59
60    public Context getContext() {
61        return sContext;
62    }
63
64    public static void setApplicationContext(Context context) {
65        if (sContext != null) {
66            Log.w(Launcher.TAG, "setApplicationContext called twice! old=" + sContext + " new=" + context);
67        }
68        sContext = context.getApplicationContext();
69    }
70
71    private LauncherAppState() {
72        if (sContext == null) {
73            throw new IllegalStateException("LauncherAppState inited before app context set");
74        }
75
76        Log.v(Launcher.TAG, "LauncherAppState inited");
77
78        if (sContext.getResources().getBoolean(R.bool.debug_memory_enabled)) {
79            MemoryTracker.startTrackingMe(sContext, "L");
80        }
81
82        // set sIsScreenXLarge and mScreenDensity *before* creating icon cache
83        mIsScreenLarge = isScreenLarge(sContext.getResources());
84        mScreenDensity = sContext.getResources().getDisplayMetrics().density;
85
86        mWidgetPreviewCacheDb = new WidgetPreviewLoader.CacheDb(sContext);
87        mIconCache = new IconCache(sContext);
88
89        mAppFilter = AppFilter.loadByName(sContext.getString(R.string.app_filter_class));
90        mModel = new LauncherModel(this, mIconCache, mAppFilter);
91
92        // Register intent receivers
93        IntentFilter filter = new IntentFilter(Intent.ACTION_PACKAGE_ADDED);
94        filter.addAction(Intent.ACTION_PACKAGE_REMOVED);
95        filter.addAction(Intent.ACTION_PACKAGE_CHANGED);
96        filter.addDataScheme("package");
97        sContext.registerReceiver(mModel, filter);
98        filter = new IntentFilter();
99        filter.addAction(Intent.ACTION_EXTERNAL_APPLICATIONS_AVAILABLE);
100        filter.addAction(Intent.ACTION_EXTERNAL_APPLICATIONS_UNAVAILABLE);
101        filter.addAction(Intent.ACTION_LOCALE_CHANGED);
102        filter.addAction(Intent.ACTION_CONFIGURATION_CHANGED);
103        sContext.registerReceiver(mModel, filter);
104        filter = new IntentFilter();
105        filter.addAction(SearchManager.INTENT_GLOBAL_SEARCH_ACTIVITY_CHANGED);
106        sContext.registerReceiver(mModel, filter);
107        filter = new IntentFilter();
108        filter.addAction(SearchManager.INTENT_ACTION_SEARCHABLES_CHANGED);
109        sContext.registerReceiver(mModel, filter);
110
111        // Register for changes to the favorites
112        ContentResolver resolver = sContext.getContentResolver();
113        resolver.registerContentObserver(LauncherSettings.Favorites.CONTENT_URI, true,
114                mFavoritesObserver);
115    }
116
117    /**
118     * Call from Application.onTerminate(), which is not guaranteed to ever be called.
119     */
120    public void onTerminate() {
121        sContext.unregisterReceiver(mModel);
122
123        ContentResolver resolver = sContext.getContentResolver();
124        resolver.unregisterContentObserver(mFavoritesObserver);
125    }
126
127    /**
128     * Receives notifications whenever the user favorites have changed.
129     */
130    private final ContentObserver mFavoritesObserver = new ContentObserver(new Handler()) {
131        @Override
132        public void onChange(boolean selfChange) {
133            // If the database has ever changed, then we really need to force a reload of the
134            // workspace on the next load
135            mModel.resetLoadedState(false, true);
136            mModel.startLoaderFromBackground();
137        }
138    };
139
140    LauncherModel setLauncher(Launcher launcher) {
141        if (mModel == null) {
142            throw new IllegalStateException("setLauncher() called before init()");
143        }
144        mModel.initialize(launcher);
145        return mModel;
146    }
147
148    IconCache getIconCache() {
149        return mIconCache;
150    }
151
152    LauncherModel getModel() {
153        return mModel;
154    }
155
156    boolean shouldShowAppOrWidgetProvider(ComponentName componentName) {
157        return mAppFilter == null || mAppFilter.shouldShowApp(componentName);
158    }
159
160    WidgetPreviewLoader.CacheDb getWidgetPreviewCacheDb() {
161        return mWidgetPreviewCacheDb;
162    }
163
164    static void setLauncherProvider(LauncherProvider provider) {
165        sLauncherProvider = new WeakReference<LauncherProvider>(provider);
166    }
167
168    static LauncherProvider getLauncherProvider() {
169        return sLauncherProvider.get();
170    }
171
172    public static String getSharedPreferencesKey() {
173        return SHARED_PREFERENCES_KEY;
174    }
175
176    DeviceProfile initDynamicGrid(Context context, int minWidth, int minHeight,
177                                  int width, int height,
178                                  int availableWidth, int availableHeight) {
179        if (mDynamicGrid == null) {
180            mDynamicGrid = new DynamicGrid(context,
181                    context.getResources(),
182                    minWidth, minHeight, width, height,
183                    availableWidth, availableHeight);
184            mDynamicGrid.getDeviceProfile().addCallback(this);
185        }
186
187        // Update the icon size
188        DeviceProfile grid = mDynamicGrid.getDeviceProfile();
189        grid.updateFromConfiguration(context, context.getResources(), width, height,
190                availableWidth, availableHeight);
191        return grid;
192    }
193    public DynamicGrid getDynamicGrid() {
194        return mDynamicGrid;
195    }
196
197    public boolean isScreenLarge() {
198        return mIsScreenLarge;
199    }
200
201    // Need a version that doesn't require an instance of LauncherAppState for the wallpaper picker
202    public static boolean isScreenLarge(Resources res) {
203        return res.getBoolean(R.bool.is_large_tablet);
204    }
205
206    public static boolean isScreenLandscape(Context context) {
207        return context.getResources().getConfiguration().orientation ==
208            Configuration.ORIENTATION_LANDSCAPE;
209    }
210
211    public float getScreenDensity() {
212        return mScreenDensity;
213    }
214
215    public int getLongPressTimeout() {
216        return mLongPressTimeout;
217    }
218
219    public void onWallpaperChanged() {
220        mWallpaperChangedSinceLastCheck = true;
221    }
222
223    public boolean hasWallpaperChangedSinceLastCheck() {
224        boolean result = mWallpaperChangedSinceLastCheck;
225        mWallpaperChangedSinceLastCheck = false;
226        return result;
227    }
228
229    @Override
230    public void onAvailableSizeChanged(DeviceProfile grid) {
231        Utilities.setIconSize(grid.iconSizePx);
232    }
233}
234