Clean up SensorStateActivity.

Hide "Sensor state" menu when no sensor is selected.

MyTracks/src/com/google/android/apps/mytracks/util/IntentUtils.java

@@ -0,0 +1,42 @@
+/*
+ * Copyright 2012 Google Inc.
+ * 
+ * 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.google.android.apps.mytracks.util;
+
+import android.content.Context;
+import android.content.Intent;
+
+/**
+ * Utilities for creating intents.
+ * 
+ * @author Jimmy Shih
+ */
+public class IntentUtils {
+
+  private IntentUtils() {}
+
+  /**
+   * Creates an intent with {@link Intent#FLAG_ACTIVITY_CLEAR_TOP} and
+   * {@link Intent#FLAG_ACTIVITY_NEW_TASK}.
+   * 
+   * @param context the context
+   * @param cls the class
+   */
+  public static final Intent newIntent(Context context, Class<?> cls) {
+    return new Intent(context, cls).addFlags(
+        Intent.FLAG_ACTIVITY_CLEAR_TOP | Intent.FLAG_ACTIVITY_NEW_TASK);
+  }
+}