1 files changed, 47 insertions, 0 deletions
diff --git a/src/com/android/camera/async/MainThread.java b/src/com/android/camera/async/MainThread.java
new file mode 100644
index 000000000..7fdb3ec9b
--- /dev/null
+++ b/src/com/android/camera/async/MainThread.java
@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2014 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.camera.async;
+
+import android.os.Handler;
+import android.os.Looper;
+
+public class MainThread extends HandlerExecutor {
+    private MainThread(Handler handler) {
+        super(handler);
+    }
+
+    public static MainThread create() {
+        return new MainThread(new Handler(Looper.getMainLooper()));
+    }
+
+    /**
+     * Caches whether or not the current thread is the main thread.
+     */
+    private static final ThreadLocal<Boolean> sIsMainThread = new ThreadLocal<Boolean>() {
+        @Override
+        protected Boolean initialValue() {
+            return Looper.getMainLooper().getThread() == Thread.currentThread();
+        }
+    };
+
+    /**
+     * Returns true if the method is run on the main android thread.
+     */
+    public static boolean isMainThread() {
+        return sIsMainThread.get();
+    }
+}