1 files changed, 36 insertions, 0 deletions
diff --git a/samples/SupportLeanbackShowcase/app/src/main/java/android/support/v17/leanback/supportleanbackshowcase/utils/ResourceCache.java b/samples/SupportLeanbackShowcase/app/src/main/java/android/support/v17/leanback/supportleanbackshowcase/utils/ResourceCache.java
new file mode 100644
index 000000000..09a196565
--- /dev/null
+++ b/samples/SupportLeanbackShowcase/app/src/main/java/android/support/v17/leanback/supportleanbackshowcase/utils/ResourceCache.java
@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
+ * in compliance with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed under the License
+ * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ * or implied. See the License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+package android.support.v17.leanback.supportleanbackshowcase.utils;
+
+import android.util.SparseArray;
+import android.view.View;
+
+/**
+ * ResourceCache allows retrieving children from a given view and caches the resulting views in
+ * order to prevent future lookups.
+ */
+public class ResourceCache {
+
+    private final SparseArray<View> mCachedViews = new SparseArray<View>();
+
+    public <ViewType extends View> ViewType getViewById(View view, int resId) {
+        View child = mCachedViews.get(resId, null);
+        if (child == null) {
+            child = view.findViewById(resId);
+            mCachedViews.put(resId, child);
+        }
+        return (ViewType) child;
+    }
+}