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      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 
     17 package com.android.launcher3;
     18 
     19 import android.app.SearchManager;
     20 import android.content.*;
     21 import android.content.res.Configuration;
     22 import android.content.res.Resources;
     23 import android.database.ContentObserver;
     24 import android.os.Handler;
     25 import android.provider.Settings;
     26 import android.util.Log;
     27 import android.view.Display;
     28 
     29 import java.lang.ref.WeakReference;
     30 
     31 public class LauncherAppState {
     32     private static final String TAG = "LauncherAppState";
     33     private static final String SHARED_PREFERENCES_KEY = "com.android.launcher3.prefs";
     34 
     35     private LauncherModel mModel;
     36     private IconCache mIconCache;
     37     private AppFilter mAppFilter;
     38     private WidgetPreviewLoader.CacheDb mWidgetPreviewCacheDb;
     39     private boolean mIsScreenLarge;
     40     private float mScreenDensity;
     41     private int mLongPressTimeout = 300;
     42 
     43     private static WeakReference<LauncherProvider> sLauncherProvider;
     44     private static Context sContext;
     45 
     46     private static LauncherAppState INSTANCE;
     47 
     48     private DynamicGrid mDynamicGrid;
     49 
     50     public static LauncherAppState getInstance() {
     51         if (INSTANCE == null) {
     52             INSTANCE = new LauncherAppState();
     53         }
     54         return INSTANCE;
     55     }
     56 
     57     public static LauncherAppState getInstanceNoCreate() {
     58         return INSTANCE;
     59     }
     60 
     61     public Context getContext() {
     62         return sContext;
     63     }
     64 
     65     public static void setApplicationContext(Context context) {
     66         if (sContext != null) {
     67             Log.w(Launcher.TAG, "setApplicationContext called twice! old=" + sContext + " new=" + context);
     68         }
     69         sContext = context.getApplicationContext();
     70     }
     71 
     72     private LauncherAppState() {
     73         if (sContext == null) {
     74             throw new IllegalStateException("LauncherAppState inited before app context set");
     75         }
     76 
     77         Log.v(Launcher.TAG, "LauncherAppState inited");
     78 
     79         if (sContext.getResources().getBoolean(R.bool.debug_memory_enabled)) {
     80             MemoryTracker.startTrackingMe(sContext, "L");
     81         }
     82 
     83         // set sIsScreenXLarge and mScreenDensity *before* creating icon cache
     84         mIsScreenLarge = isScreenLarge(sContext.getResources());
     85         mScreenDensity = sContext.getResources().getDisplayMetrics().density;
     86 
     87         mWidgetPreviewCacheDb = new WidgetPreviewLoader.CacheDb(sContext);
     88         mIconCache = new IconCache(sContext);
     89 
     90         mAppFilter = AppFilter.loadByName(sContext.getString(R.string.app_filter_class));
     91         mModel = new LauncherModel(this, mIconCache, mAppFilter);
     92 
     93         // Register intent receivers
     94         IntentFilter filter = new IntentFilter(Intent.ACTION_PACKAGE_ADDED);
     95         filter.addAction(Intent.ACTION_PACKAGE_REMOVED);
     96         filter.addAction(Intent.ACTION_PACKAGE_CHANGED);
     97         filter.addDataScheme("package");
     98         sContext.registerReceiver(mModel, filter);
     99         filter = new IntentFilter();
    100         filter.addAction(Intent.ACTION_EXTERNAL_APPLICATIONS_AVAILABLE);
    101         filter.addAction(Intent.ACTION_EXTERNAL_APPLICATIONS_UNAVAILABLE);
    102         filter.addAction(Intent.ACTION_LOCALE_CHANGED);
    103         filter.addAction(Intent.ACTION_CONFIGURATION_CHANGED);
    104         sContext.registerReceiver(mModel, filter);
    105         filter = new IntentFilter();
    106         filter.addAction(SearchManager.INTENT_GLOBAL_SEARCH_ACTIVITY_CHANGED);
    107         sContext.registerReceiver(mModel, filter);
    108         filter = new IntentFilter();
    109         filter.addAction(SearchManager.INTENT_ACTION_SEARCHABLES_CHANGED);
    110         sContext.registerReceiver(mModel, filter);
    111 
    112         // Register for changes to the favorites
    113         ContentResolver resolver = sContext.getContentResolver();
    114         resolver.registerContentObserver(LauncherSettings.Favorites.CONTENT_URI, true,
    115                 mFavoritesObserver);
    116     }
    117 
    118     /**
    119      * Call from Application.onTerminate(), which is not guaranteed to ever be called.
    120      */
    121     public void onTerminate() {
    122         sContext.unregisterReceiver(mModel);
    123 
    124         ContentResolver resolver = sContext.getContentResolver();
    125         resolver.unregisterContentObserver(mFavoritesObserver);
    126     }
    127 
    128     /**
    129      * Receives notifications whenever the user favorites have changed.
    130      */
    131     private final ContentObserver mFavoritesObserver = new ContentObserver(new Handler()) {
    132         @Override
    133         public void onChange(boolean selfChange) {
    134             // If the database has ever changed, then we really need to force a reload of the
    135             // workspace on the next load
    136             mModel.resetLoadedState(false, true);
    137             mModel.startLoaderFromBackground();
    138         }
    139     };
    140 
    141     LauncherModel setLauncher(Launcher launcher) {
    142         if (mModel == null) {
    143             throw new IllegalStateException("setLauncher() called before init()");
    144         }
    145         mModel.initialize(launcher);
    146         return mModel;
    147     }
    148 
    149     IconCache getIconCache() {
    150         return mIconCache;
    151     }
    152 
    153     LauncherModel getModel() {
    154         return mModel;
    155     }
    156 
    157     boolean shouldShowAppOrWidgetProvider(ComponentName componentName) {
    158         return mAppFilter == null || mAppFilter.shouldShowApp(componentName);
    159     }
    160 
    161     WidgetPreviewLoader.CacheDb getWidgetPreviewCacheDb() {
    162         return mWidgetPreviewCacheDb;
    163     }
    164 
    165     static void setLauncherProvider(LauncherProvider provider) {
    166         sLauncherProvider = new WeakReference<LauncherProvider>(provider);
    167     }
    168 
    169     static LauncherProvider getLauncherProvider() {
    170         return sLauncherProvider.get();
    171     }
    172 
    173     public static String getSharedPreferencesKey() {
    174         return SHARED_PREFERENCES_KEY;
    175     }
    176 
    177     DeviceProfile initDynamicGrid(Context context, int minWidth, int minHeight,
    178                                   int width, int height,
    179                                   int availableWidth, int availableHeight) {
    180         if (mDynamicGrid == null) {
    181             mDynamicGrid = new DynamicGrid(context,
    182                     context.getResources(),
    183                     minWidth, minHeight, width, height,
    184                     availableWidth, availableHeight);
    185         }
    186 
    187         // Update the icon size
    188         DeviceProfile grid = mDynamicGrid.getDeviceProfile();
    189         Utilities.setIconSize(grid.iconSizePx);
    190         grid.updateFromConfiguration(context.getResources(), width, height,
    191                 availableWidth, availableHeight);
    192         return grid;
    193     }
    194     DynamicGrid getDynamicGrid() {
    195         return mDynamicGrid;
    196     }
    197 
    198     public boolean isScreenLarge() {
    199         return mIsScreenLarge;
    200     }
    201 
    202     // Need a version that doesn't require an instance of LauncherAppState for the wallpaper picker
    203     public static boolean isScreenLarge(Resources res) {
    204         return res.getBoolean(R.bool.is_large_tablet);
    205     }
    206 
    207     public static boolean isScreenLandscape(Context context) {
    208         return context.getResources().getConfiguration().orientation ==
    209             Configuration.ORIENTATION_LANDSCAPE;
    210     }
    211 
    212     public float getScreenDensity() {
    213         return mScreenDensity;
    214     }
    215 
    216     public int getLongPressTimeout() {
    217         return mLongPressTimeout;
    218     }
    219 }
    220