ResourcesManager.java revision add005cf94dcc815d29b54588c76fd87929075b3 
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 android.app;
18
19import static android.app.ActivityThread.DEBUG_CONFIGURATION;
20
21import android.content.pm.ActivityInfo;
22import android.content.res.AssetManager;
23import android.content.res.CompatibilityInfo;
24import android.content.res.Configuration;
25import android.content.res.Resources;
26import android.content.res.ResourcesKey;
27import android.hardware.display.DisplayManagerGlobal;
28import android.os.IBinder;
29import android.util.ArrayMap;
30import android.util.DisplayMetrics;
31import android.util.Slog;
32import android.view.Display;
33import android.view.DisplayAdjustments;
34
35import java.lang.ref.WeakReference;
36import java.util.Locale;
37
38/** @hide */
39public class ResourcesManager {
40    static final String TAG = "ResourcesManager";
41    static final boolean DEBUG_CACHE = false;
42    static final boolean DEBUG_STATS = true;
43
44    private static ResourcesManager sResourcesManager;
45    final ArrayMap<ResourcesKey, WeakReference<Resources> > mActiveResources
46            = new ArrayMap<ResourcesKey, WeakReference<Resources> >();
47
48    final ArrayMap<DisplayAdjustments, DisplayMetrics> mDefaultDisplayMetrics
49            = new ArrayMap<DisplayAdjustments, DisplayMetrics>();
50
51    CompatibilityInfo mResCompatibilityInfo;
52
53    Configuration mResConfiguration;
54    final Configuration mTmpConfig = new Configuration();
55
56    public static ResourcesManager getInstance() {
57        synchronized (ResourcesManager.class) {
58            if (sResourcesManager == null) {
59                sResourcesManager = new ResourcesManager();
60            }
61            return sResourcesManager;
62        }
63    }
64
65    public Configuration getConfiguration() {
66        return mResConfiguration;
67    }
68
69    public void flushDisplayMetricsLocked() {
70        mDefaultDisplayMetrics.clear();
71    }
72
73    public DisplayMetrics getDisplayMetricsLocked(int displayId) {
74        return getDisplayMetricsLocked(displayId, DisplayAdjustments.DEFAULT_DISPLAY_ADJUSTMENTS);
75    }
76
77    public DisplayMetrics getDisplayMetricsLocked(int displayId, DisplayAdjustments daj) {
78        boolean isDefaultDisplay = (displayId == Display.DEFAULT_DISPLAY);
79        DisplayMetrics dm = isDefaultDisplay ? mDefaultDisplayMetrics.get(daj) : null;
80        if (dm != null) {
81            return dm;
82        }
83        dm = new DisplayMetrics();
84
85        DisplayManagerGlobal displayManager = DisplayManagerGlobal.getInstance();
86        if (displayManager == null) {
87            // may be null early in system startup
88            dm.setToDefaults();
89            return dm;
90        }
91
92        if (isDefaultDisplay) {
93            mDefaultDisplayMetrics.put(daj, dm);
94        }
95
96        Display d = displayManager.getCompatibleDisplay(displayId, daj);
97        if (d != null) {
98            d.getMetrics(dm);
99        } else {
100            // Display no longer exists
101            // FIXME: This would not be a problem if we kept the Display object around
102            // instead of using the raw display id everywhere.  The Display object caches
103            // its information even after the display has been removed.
104            dm.setToDefaults();
105        }
106        //Slog.i("foo", "New metrics: w=" + metrics.widthPixels + " h="
107        //        + metrics.heightPixels + " den=" + metrics.density
108        //        + " xdpi=" + metrics.xdpi + " ydpi=" + metrics.ydpi);
109        return dm;
110    }
111
112    final void applyNonDefaultDisplayMetricsToConfigurationLocked(
113            DisplayMetrics dm, Configuration config) {
114        config.touchscreen = Configuration.TOUCHSCREEN_NOTOUCH;
115        config.densityDpi = dm.densityDpi;
116        config.screenWidthDp = (int)(dm.widthPixels / dm.density);
117        config.screenHeightDp = (int)(dm.heightPixels / dm.density);
118        int sl = Configuration.resetScreenLayout(config.screenLayout);
119        if (dm.widthPixels > dm.heightPixels) {
120            config.orientation = Configuration.ORIENTATION_LANDSCAPE;
121            config.screenLayout = Configuration.reduceScreenLayout(sl,
122                    config.screenWidthDp, config.screenHeightDp);
123        } else {
124            config.orientation = Configuration.ORIENTATION_PORTRAIT;
125            config.screenLayout = Configuration.reduceScreenLayout(sl,
126                    config.screenHeightDp, config.screenWidthDp);
127        }
128        config.smallestScreenWidthDp = config.screenWidthDp; // assume screen does not rotate
129        config.compatScreenWidthDp = config.screenWidthDp;
130        config.compatScreenHeightDp = config.screenHeightDp;
131        config.compatSmallestScreenWidthDp = config.smallestScreenWidthDp;
132    }
133
134    public boolean applyCompatConfiguration(int displayDensity,
135            Configuration compatConfiguration) {
136        if (mResCompatibilityInfo != null && !mResCompatibilityInfo.supportsScreen()) {
137            mResCompatibilityInfo.applyToConfiguration(displayDensity, compatConfiguration);
138            return true;
139        }
140        return false;
141    }
142
143    /**
144     * Creates the top level Resources for applications with the given compatibility info.
145     *
146     * @param resDir the resource directory.
147     * @param compatInfo the compability info. Must not be null.
148     * @param token the application token for determining stack bounds.
149     */
150    public Resources getTopLevelResources(String resDir, int displayId,
151            Configuration overrideConfiguration, CompatibilityInfo compatInfo, IBinder token) {
152        final float scale = compatInfo.applicationScale;
153        ResourcesKey key = new ResourcesKey(resDir, displayId, overrideConfiguration, scale,
154                token);
155        Resources r;
156        synchronized (this) {
157            // Resources is app scale dependent.
158            if (false) {
159                Slog.w(TAG, "getTopLevelResources: " + resDir + " / " + scale);
160            }
161            WeakReference<Resources> wr = mActiveResources.get(key);
162            r = wr != null ? wr.get() : null;
163            //if (r != null) Slog.i(TAG, "isUpToDate " + resDir + ": " + r.getAssets().isUpToDate());
164            if (r != null && r.getAssets().isUpToDate()) {
165                if (false) {
166                    Slog.w(TAG, "Returning cached resources " + r + " " + resDir
167                            + ": appScale=" + r.getCompatibilityInfo().applicationScale);
168                }
169                return r;
170            }
171        }
172
173        //if (r != null) {
174        //    Slog.w(TAG, "Throwing away out-of-date resources!!!! "
175        //            + r + " " + resDir);
176        //}
177
178        AssetManager assets = new AssetManager();
179        if (assets.addAssetPath(resDir) == 0) {
180            return null;
181        }
182
183        //Slog.i(TAG, "Resource: key=" + key + ", display metrics=" + metrics);
184        DisplayMetrics dm = getDisplayMetricsLocked(displayId);
185        Configuration config;
186        boolean isDefaultDisplay = (displayId == Display.DEFAULT_DISPLAY);
187        final boolean hasOverrideConfig = key.hasOverrideConfiguration();
188        if (!isDefaultDisplay || hasOverrideConfig) {
189            config = new Configuration(getConfiguration());
190            if (!isDefaultDisplay) {
191                applyNonDefaultDisplayMetricsToConfigurationLocked(dm, config);
192            }
193            if (hasOverrideConfig) {
194                config.updateFrom(key.mOverrideConfiguration);
195            }
196        } else {
197            config = getConfiguration();
198        }
199        r = new Resources(assets, dm, config, compatInfo, token);
200        if (false) {
201            Slog.i(TAG, "Created app resources " + resDir + " " + r + ": "
202                    + r.getConfiguration() + " appScale="
203                    + r.getCompatibilityInfo().applicationScale);
204        }
205
206        synchronized (this) {
207            WeakReference<Resources> wr = mActiveResources.get(key);
208            Resources existing = wr != null ? wr.get() : null;
209            if (existing != null && existing.getAssets().isUpToDate()) {
210                // Someone else already created the resources while we were
211                // unlocked; go ahead and use theirs.
212                r.getAssets().close();
213                return existing;
214            }
215
216            // XXX need to remove entries when weak references go away
217            mActiveResources.put(key, new WeakReference<Resources>(r));
218            return r;
219        }
220    }
221
222    public final boolean applyConfigurationToResourcesLocked(Configuration config,
223            CompatibilityInfo compat) {
224        if (mResConfiguration == null) {
225            mResConfiguration = new Configuration();
226        }
227        if (!mResConfiguration.isOtherSeqNewer(config) && compat == null) {
228            if (DEBUG_CONFIGURATION) Slog.v(TAG, "Skipping new config: curSeq="
229                    + mResConfiguration.seq + ", newSeq=" + config.seq);
230            return false;
231        }
232        int changes = mResConfiguration.updateFrom(config);
233        flushDisplayMetricsLocked();
234        DisplayMetrics defaultDisplayMetrics = getDisplayMetricsLocked(Display.DEFAULT_DISPLAY);
235
236        if (compat != null && (mResCompatibilityInfo == null ||
237                !mResCompatibilityInfo.equals(compat))) {
238            mResCompatibilityInfo = compat;
239            changes |= ActivityInfo.CONFIG_SCREEN_LAYOUT
240                    | ActivityInfo.CONFIG_SCREEN_SIZE
241                    | ActivityInfo.CONFIG_SMALLEST_SCREEN_SIZE;
242        }
243
244        // set it for java, this also affects newly created Resources
245        if (config.locale != null) {
246            Locale.setDefault(config.locale);
247        }
248
249        Resources.updateSystemConfiguration(config, defaultDisplayMetrics, compat);
250
251        ApplicationPackageManager.configurationChanged();
252        //Slog.i(TAG, "Configuration changed in " + currentPackageName());
253
254        Configuration tmpConfig = null;
255
256        for (int i=mActiveResources.size()-1; i>=0; i--) {
257            ResourcesKey key = mActiveResources.keyAt(i);
258            Resources r = mActiveResources.valueAt(i).get();
259            if (r != null) {
260                if (DEBUG_CONFIGURATION) Slog.v(TAG, "Changing resources "
261                        + r + " config to: " + config);
262                int displayId = key.mDisplayId;
263                boolean isDefaultDisplay = (displayId == Display.DEFAULT_DISPLAY);
264                DisplayMetrics dm = defaultDisplayMetrics;
265                final boolean hasOverrideConfiguration = key.hasOverrideConfiguration();
266                if (!isDefaultDisplay || hasOverrideConfiguration) {
267                    if (tmpConfig == null) {
268                        tmpConfig = new Configuration();
269                    }
270                    tmpConfig.setTo(config);
271                    if (!isDefaultDisplay) {
272                        dm = getDisplayMetricsLocked(displayId);
273                        applyNonDefaultDisplayMetricsToConfigurationLocked(dm, tmpConfig);
274                    }
275                    if (hasOverrideConfiguration) {
276                        tmpConfig.updateFrom(key.mOverrideConfiguration);
277                    }
278                    r.updateConfiguration(tmpConfig, dm, compat);
279                } else {
280                    r.updateConfiguration(config, dm, compat);
281                }
282                //Slog.i(TAG, "Updated app resources " + v.getKey()
283                //        + " " + r + ": " + r.getConfiguration());
284            } else {
285                //Slog.i(TAG, "Removing old resources " + v.getKey());
286                mActiveResources.removeAt(i);
287            }
288        }
289
290        return changes != 0;
291    }
292
293}
294