General cleanup on AppRTC Android Demo codebase

webrtc/examples/androidapp/src/org/appspot/apprtc/AppRTCProximitySensor.java

 /*
  *  Copyright 2014 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 39 matching lines @@
   }
 
   private AppRTCProximitySensor(Context context, Runnable sensorStateListener) {
     Log.d(TAG, "AppRTCProximitySensor" + AppRTCUtils.getThreadInfo());
     onSensorStateListener = sensorStateListener;
     sensorManager = ((SensorManager) context.getSystemService(
         Context.SENSOR_SERVICE));
   }
 
   /**
-   * Activate the proximity sensor. Also do initializtion if called for the
+   * Activate the proximity sensor. Also do initialization if called for the
    * first time.
    */
   public boolean start() {
     checkIfCalledOnValidThread();
     Log.d(TAG, "start" + AppRTCUtils.getThreadInfo());
     if (!initDefaultSensor()) {
       // Proximity sensor is not supported on this device.
       return false;
     }
     sensorManager.registerListener(
@@ skipping 47 matching lines @@
       onSensorStateListener.run();
     }
 
     Log.d(TAG, "onSensorChanged" + AppRTCUtils.getThreadInfo() + ": "
         + "accuracy=" + event.accuracy
         + ", timestamp=" + event.timestamp + ", distance=" + event.values[0]);
   }
 
   /**
    * Get default proximity sensor if it exists. Tablet devices (e.g. Nexus 7)
-   * does not support this type of sensor and false will be retured in such
+   * does not support this type of sensor and false will be returned in such
    * cases.
    */
   private boolean initDefaultSensor() {
     if (proximitySensor != null) {
       return true;
     }
     proximitySensor = sensorManager.getDefaultSensor(Sensor.TYPE_PROXIMITY);
     if (proximitySensor == null) {
       return false;
     }
     logProximitySensorInfo();
     return true;
   }
 
   /** Helper method for logging information about the proximity sensor. */
   private void logProximitySensorInfo() {
     if (proximitySensor == null) {
       return;
     }
     StringBuilder info = new StringBuilder("Proximity sensor: ");
-    info.append("name=" + proximitySensor.getName());
-    info.append(", vendor: " + proximitySensor.getVendor());
-    info.append(", power: " + proximitySensor.getPower());
-    info.append(", resolution: " + proximitySensor.getResolution());
-    info.append(", max range: " + proximitySensor.getMaximumRange());
+    info.append("name=").append(proximitySensor.getName());
+    info.append(", vendor: ").append(proximitySensor.getVendor());
+    info.append(", power: ").append(proximitySensor.getPower());
+    info.append(", resolution: ").append(proximitySensor.getResolution());
+    info.append(", max range: ").append(proximitySensor.getMaximumRange());
     if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.GINGERBREAD) {
       // Added in API level 9.
-      info.append(", min delay: " + proximitySensor.getMinDelay());
+      info.append(", min delay: ").append(proximitySensor.getMinDelay());
     }
     if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT_WATCH) {
       // Added in API level 20.
-      info.append(", type: " + proximitySensor.getStringType());
+      info.append(", type: ").append(proximitySensor.getStringType());
     }
     if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
       // Added in API level 21.
-      info.append(", max delay: " + proximitySensor.getMaxDelay());
-      info.append(", reporting mode: " + proximitySensor.getReportingMode());
-      info.append(", isWakeUpSensor: " + proximitySensor.isWakeUpSensor());
+      info.append(", max delay: ").append(proximitySensor.getMaxDelay());
+      info.append(", reporting mode: ").append(proximitySensor.getReportingMode());
+      info.append(", isWakeUpSensor: ").append(proximitySensor.isWakeUpSensor());
     }
     Log.d(TAG, info.toString());
   }
 
   /**
    * Helper method for debugging purposes. Ensures that method is
    * called on same thread as this object was created on.
    */
   private void checkIfCalledOnValidThread() {
     if (!nonThreadSafe.calledOnValidThread()) {
       throw new IllegalStateException("Method is not called on valid thread");
     }
   }
 }