Merge "Fix some lint warnings in Gallery." into gb-ub-photos-arches

1 files changed, 66 insertions, 0 deletions

diff --git a/gallerycommon/src/com/android/gallery3d/common/AsyncTaskUtil.java b/gallerycommon/src/com/android/gallery3d/common/AsyncTaskUtil.java
new file mode 100644
index 000000000..b70c4d365
--- /dev/null
+++ b/gallerycommon/src/com/android/gallery3d/common/AsyncTaskUtil.java
@@ -0,0 +1,66 @@
+/*
+ * Copyright (C) 2012 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 com.android.gallery3d.common;
+
+import android.os.AsyncTask;
+import android.os.Build;
+
+import java.lang.reflect.InvocationTargetException;
+import java.lang.reflect.Method;
+import java.util.concurrent.Executor;
+
+/**
+ * Helper class to execute an AsyncTask in parallel if SDK version is 11 or newer.
+ */
+public class AsyncTaskUtil {
+    private static Method sMethodExecuteOnExecutor;
+    private static Executor sExecutor;
+    static {
+        if (Build.VERSION.SDK_INT >= 11) {
+            try {
+                sExecutor = (Executor) AsyncTask.class.getField("THREAD_POOL_EXECUTOR")
+                        .get(null);
+                sMethodExecuteOnExecutor = AsyncTask.class.getMethod(
+                        "executeOnExecutor", Executor.class, Object[].class);
+            } catch (IllegalAccessException e) {
+                throw new RuntimeException(e);
+            } catch (NoSuchFieldException e) {
+                throw new RuntimeException(e);
+            } catch (NoSuchMethodException e) {
+                throw new RuntimeException(e);
+            }
+        }
+    }
+
+    public static <Param> void executeInParallel(AsyncTask<Param, ?, ?> task, Param... params) {
+        if (Build.VERSION.SDK_INT < 11) {
+            task.execute(params);
+        } else {
+            try {
+                sMethodExecuteOnExecutor.invoke(task, sExecutor, params);
+            } catch (IllegalAccessException e) {
+                throw new RuntimeException(e);
+            } catch (InvocationTargetException e) {
+                throw new RuntimeException(e);
+            }
+        }
+    }
+
+    private AsyncTaskUtil() {
+    }
+}
+