Prune the resource cache before adding new caches (9267fda3) · Commits · e / os / android_frameworks_base

core/java/android/content/res/Resources.java

+37 −0

Original line number	Diff line number	Diff line
		@@ -2425,6 +2425,9 @@ public class Resources {
		final String themeKey = theme == null ? "" : theme.mKey;
		LongSparseArray<WeakReference<ConstantState>> themedCache = caches.get(themeKey);
		if (themedCache == null) {
		// Clean out the caches before we add more. This shouldn't
		// happen very often.
		pruneCaches(caches);
		themedCache = new LongSparseArray<WeakReference<ConstantState>>(1);
		caches.put(themeKey, themedCache);
		}
		@@ -2433,6 +2436,40 @@ public class Resources {
		}
		}

		/**
		* Prunes empty caches from the cache map.
		*
		* @param caches The map of caches to prune.
		*/
		private void pruneCaches(ArrayMap<String,
		LongSparseArray<WeakReference<ConstantState>>> caches) {
		final int N = caches.size();
		for (int i = N - 1; i >= 0; i--) {
		final LongSparseArray<WeakReference<ConstantState>> cache = caches.get(i);
		if (pruneCache(cache)) {
		caches.removeAt(i);
		}
		}
		}

		/**
		* Prunes obsolete weak references from a cache, returning {@code true} if
		* the cache is empty and should be removed.
		*
		* @param cache The cache of weak references to prune.
		* @return {@code true} if the cache is empty and should be removed.
		*/
		private boolean pruneCache(LongSparseArray<WeakReference<ConstantState>> cache) {
		final int N = cache.size();
		for (int i = N - 1; i >= 0; i--) {
		final WeakReference entry = cache.valueAt(i);
		if (entry.get() == null) {
		cache.removeAt(i);
		}
		}
		return cache.size() == 0;
		}

		/**
		* Loads a drawable from XML or resources stream.
		*/