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ResourcesManager.javaAPI DocAndroid 5.1 API13244Thu Mar 12 22:22:10 GMT 2015android.app

ResourcesManager

public class ResourcesManager extends Object
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Fields Summary
static final String
TAG
static final boolean
DEBUG_CACHE
static final boolean
DEBUG_STATS
private static ResourcesManager
sResourcesManager
final android.util.ArrayMap
mActiveResources
final android.util.ArrayMap
mDefaultDisplayMetrics
android.content.res.CompatibilityInfo
mResCompatibilityInfo
android.content.res.Configuration
mResConfiguration
final android.content.res.Configuration
mTmpConfig
Constructors Summary
Methods Summary
public booleanapplyCompatConfiguration(int displayDensity, android.content.res.Configuration compatConfiguration)

        if (mResCompatibilityInfo != null && !mResCompatibilityInfo.supportsScreen()) {
            mResCompatibilityInfo.applyToConfiguration(displayDensity, compatConfiguration);
            return true;
        }
        return false;
public final booleanapplyConfigurationToResourcesLocked(android.content.res.Configuration config, android.content.res.CompatibilityInfo compat)

        if (mResConfiguration == null) {
            mResConfiguration = new Configuration();
        }
        if (!mResConfiguration.isOtherSeqNewer(config) && compat == null) {
            if (DEBUG_CONFIGURATION) Slog.v(TAG, "Skipping new config: curSeq="
                    + mResConfiguration.seq + ", newSeq=" + config.seq);
            return false;
        }
        int changes = mResConfiguration.updateFrom(config);
        flushDisplayMetricsLocked();
        DisplayMetrics defaultDisplayMetrics = getDisplayMetricsLocked(Display.DEFAULT_DISPLAY);

        if (compat != null && (mResCompatibilityInfo == null ||
                !mResCompatibilityInfo.equals(compat))) {
            mResCompatibilityInfo = compat;
            changes |= ActivityInfo.CONFIG_SCREEN_LAYOUT
                    | ActivityInfo.CONFIG_SCREEN_SIZE
                    | ActivityInfo.CONFIG_SMALLEST_SCREEN_SIZE;
        }

        // set it for java, this also affects newly created Resources
        if (config.locale != null) {
            Locale.setDefault(config.locale);
        }

        Resources.updateSystemConfiguration(config, defaultDisplayMetrics, compat);

        ApplicationPackageManager.configurationChanged();
        //Slog.i(TAG, "Configuration changed in " + currentPackageName());

        Configuration tmpConfig = null;

        for (int i=mActiveResources.size()-1; i>=0; i--) {
            ResourcesKey key = mActiveResources.keyAt(i);
            Resources r = mActiveResources.valueAt(i).get();
            if (r != null) {
                if (DEBUG_CONFIGURATION) Slog.v(TAG, "Changing resources "
                        + r + " config to: " + config);
                int displayId = key.mDisplayId;
                boolean isDefaultDisplay = (displayId == Display.DEFAULT_DISPLAY);
                DisplayMetrics dm = defaultDisplayMetrics;
                final boolean hasOverrideConfiguration = key.hasOverrideConfiguration();
                if (!isDefaultDisplay || hasOverrideConfiguration) {
                    if (tmpConfig == null) {
                        tmpConfig = new Configuration();
                    }
                    tmpConfig.setTo(config);
                    if (!isDefaultDisplay) {
                        dm = getDisplayMetricsLocked(displayId);
                        applyNonDefaultDisplayMetricsToConfigurationLocked(dm, tmpConfig);
                    }
                    if (hasOverrideConfiguration) {
                        tmpConfig.updateFrom(key.mOverrideConfiguration);
                    }
                    r.updateConfiguration(tmpConfig, dm, compat);
                } else {
                    r.updateConfiguration(config, dm, compat);
                }
                //Slog.i(TAG, "Updated app resources " + v.getKey()
                //        + " " + r + ": " + r.getConfiguration());
            } else {
                //Slog.i(TAG, "Removing old resources " + v.getKey());
                mActiveResources.removeAt(i);
            }
        }

        return changes != 0;
final voidapplyNonDefaultDisplayMetricsToConfigurationLocked(android.util.DisplayMetrics dm, android.content.res.Configuration config)

        config.touchscreen = Configuration.TOUCHSCREEN_NOTOUCH;
        config.densityDpi = dm.densityDpi;
        config.screenWidthDp = (int)(dm.widthPixels / dm.density);
        config.screenHeightDp = (int)(dm.heightPixels / dm.density);
        int sl = Configuration.resetScreenLayout(config.screenLayout);
        if (dm.widthPixels > dm.heightPixels) {
            config.orientation = Configuration.ORIENTATION_LANDSCAPE;
            config.screenLayout = Configuration.reduceScreenLayout(sl,
                    config.screenWidthDp, config.screenHeightDp);
        } else {
            config.orientation = Configuration.ORIENTATION_PORTRAIT;
            config.screenLayout = Configuration.reduceScreenLayout(sl,
                    config.screenHeightDp, config.screenWidthDp);
        }
        config.smallestScreenWidthDp = config.screenWidthDp; // assume screen does not rotate
        config.compatScreenWidthDp = config.screenWidthDp;
        config.compatScreenHeightDp = config.screenHeightDp;
        config.compatSmallestScreenWidthDp = config.smallestScreenWidthDp;
public voidflushDisplayMetricsLocked()

        mDefaultDisplayMetrics.clear();
public android.content.res.ConfigurationgetConfiguration()

        return mResConfiguration;
public android.util.DisplayMetricsgetDisplayMetricsLocked(int displayId)

        return getDisplayMetricsLocked(displayId, DisplayAdjustments.DEFAULT_DISPLAY_ADJUSTMENTS);
public android.util.DisplayMetricsgetDisplayMetricsLocked(int displayId, android.view.DisplayAdjustments daj)

        boolean isDefaultDisplay = (displayId == Display.DEFAULT_DISPLAY);
        DisplayMetrics dm = isDefaultDisplay ? mDefaultDisplayMetrics.get(daj) : null;
        if (dm != null) {
            return dm;
        }
        dm = new DisplayMetrics();

        DisplayManagerGlobal displayManager = DisplayManagerGlobal.getInstance();
        if (displayManager == null) {
            // may be null early in system startup
            dm.setToDefaults();
            return dm;
        }

        if (isDefaultDisplay) {
            mDefaultDisplayMetrics.put(daj, dm);
        }

        Display d = displayManager.getCompatibleDisplay(displayId, daj);
        if (d != null) {
            d.getMetrics(dm);
        } else {
            // Display no longer exists
            // FIXME: This would not be a problem if we kept the Display object around
            // instead of using the raw display id everywhere.  The Display object caches
            // its information even after the display has been removed.
            dm.setToDefaults();
        }
        //Slog.i("foo", "New metrics: w=" + metrics.widthPixels + " h="
        //        + metrics.heightPixels + " den=" + metrics.density
        //        + " xdpi=" + metrics.xdpi + " ydpi=" + metrics.ydpi);
        return dm;
public static android.app.ResourcesManagergetInstance()


        
        synchronized (ResourcesManager.class) {
            if (sResourcesManager == null) {
                sResourcesManager = new ResourcesManager();
            }
            return sResourcesManager;
        }
public android.content.res.ResourcesgetTopLevelResources(java.lang.String resDir, java.lang.String[] splitResDirs, java.lang.String[] overlayDirs, java.lang.String[] libDirs, int displayId, android.content.res.Configuration overrideConfiguration, android.content.res.CompatibilityInfo compatInfo, android.os.IBinder token)
Creates the top level Resources for applications with the given compatibility info.

param
resDir the resource directory.
param
overlayDirs the resource overlay directories.
param
libDirs the shared library resource dirs this app references.
param
compatInfo the compability info. Must not be null.
param
token the application token for determining stack bounds.

        final float scale = compatInfo.applicationScale;
        ResourcesKey key = new ResourcesKey(resDir, displayId, overrideConfiguration, scale, token);
        Resources r;
        synchronized (this) {
            // Resources is app scale dependent.
            if (false) {
                Slog.w(TAG, "getTopLevelResources: " + resDir + " / " + scale);
            }
            WeakReference<Resources> wr = mActiveResources.get(key);
            r = wr != null ? wr.get() : null;
            //if (r != null) Slog.i(TAG, "isUpToDate " + resDir + ": " + r.getAssets().isUpToDate());
            if (r != null && r.getAssets().isUpToDate()) {
                if (false) {
                    Slog.w(TAG, "Returning cached resources " + r + " " + resDir
                            + ": appScale=" + r.getCompatibilityInfo().applicationScale);
                }
                return r;
            }
        }

        //if (r != null) {
        //    Slog.w(TAG, "Throwing away out-of-date resources!!!! "
        //            + r + " " + resDir);
        //}

        AssetManager assets = new AssetManager();
        // resDir can be null if the 'android' package is creating a new Resources object.
        // This is fine, since each AssetManager automatically loads the 'android' package
        // already.
        if (resDir != null) {
            if (assets.addAssetPath(resDir) == 0) {
                return null;
            }
        }

        if (splitResDirs != null) {
            for (String splitResDir : splitResDirs) {
                if (assets.addAssetPath(splitResDir) == 0) {
                    return null;
                }
            }
        }

        if (overlayDirs != null) {
            for (String idmapPath : overlayDirs) {
                assets.addOverlayPath(idmapPath);
            }
        }

        if (libDirs != null) {
            for (String libDir : libDirs) {
                if (assets.addAssetPath(libDir) == 0) {
                    Slog.w(TAG, "Asset path '" + libDir +
                            "' does not exist or contains no resources.");
                }
            }
        }

        //Slog.i(TAG, "Resource: key=" + key + ", display metrics=" + metrics);
        DisplayMetrics dm = getDisplayMetricsLocked(displayId);
        Configuration config;
        boolean isDefaultDisplay = (displayId == Display.DEFAULT_DISPLAY);
        final boolean hasOverrideConfig = key.hasOverrideConfiguration();
        if (!isDefaultDisplay || hasOverrideConfig) {
            config = new Configuration(getConfiguration());
            if (!isDefaultDisplay) {
                applyNonDefaultDisplayMetricsToConfigurationLocked(dm, config);
            }
            if (hasOverrideConfig) {
                config.updateFrom(key.mOverrideConfiguration);
            }
        } else {
            config = getConfiguration();
        }
        r = new Resources(assets, dm, config, compatInfo, token);
        if (false) {
            Slog.i(TAG, "Created app resources " + resDir + " " + r + ": "
                    + r.getConfiguration() + " appScale="
                    + r.getCompatibilityInfo().applicationScale);
        }

        synchronized (this) {
            WeakReference<Resources> wr = mActiveResources.get(key);
            Resources existing = wr != null ? wr.get() : null;
            if (existing != null && existing.getAssets().isUpToDate()) {
                // Someone else already created the resources while we were
                // unlocked; go ahead and use theirs.
                r.getAssets().close();
                return existing;
            }

            // XXX need to remove entries when weak references go away
            mActiveResources.put(key, new WeakReference<Resources>(r));
            return r;
        }