Cutting service binding and preferences dependencies to the MyTracks singleton.

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

@@ -23,26 +23,23 @@ import com.google.android.apps.mytracks.content.TracksColumns;
 import com.google.android.apps.mytracks.content.WaypointCreationRequest;
 import com.google.android.apps.mytracks.io.file.TempFileCleaner;
 import com.google.android.apps.mytracks.services.ITrackRecordingService;
-import com.google.android.apps.mytracks.services.TrackRecordingService;
+import com.google.android.apps.mytracks.services.TrackRecordingServiceBinder;
 import com.google.android.apps.mytracks.services.tasks.StatusAnnouncerFactory;
 import com.google.android.apps.mytracks.util.ApiFeatures;
-import com.google.android.apps.mytracks.util.UriUtils;
 import com.google.android.apps.mytracks.util.SystemUtils;
+import com.google.android.apps.mytracks.util.UriUtils;
 import com.google.android.maps.mytracks.R;
 
 import android.app.Activity;
 import android.app.AlertDialog;
 import android.app.TabActivity;
-import android.content.ComponentName;
 import android.content.ContentUris;
 import android.content.DialogInterface;
 import android.content.Intent;
-import android.content.ServiceConnection;
 import android.content.SharedPreferences;
 import android.content.res.Resources;
 import android.net.Uri;
 import android.os.Bundle;
-import android.os.IBinder;
 import android.os.RemoteException;
 import android.util.Log;
 import android.view.Menu;
@@ -60,6 +57,7 @@ import android.widget.Toast;
  * The super activity that embeds our sub activities.
  *
  * @author Leif Hendrik Wilden
+ * @author Rodrigo Damazio
  */
 public class MyTracks extends TabActivity implements OnTouchListener {
   private TrackDataHub dataHub;
@@ -80,48 +78,12 @@ public class MyTracks extends TabActivity implements OnTouchListener {
    */
   private boolean startNewTrackRequested = false;
 
-  private ITrackRecordingService trackRecordingService;
-
   /**
    * Utilities to deal with the database.
    */
   private MyTracksProviderUtils providerUtils;
 
-  private SharedPreferences sharedPreferences;
-
-  /**
-   * The connection to the track recording service.
-   */
-  private final ServiceConnection serviceConnection = new ServiceConnection() {
-    @Override
-    public void onServiceConnected(ComponentName className, IBinder service) {
-      Log.d(Constants.TAG, "MyTracks: Service now connected.");
-      // Delay setting the service until we are done with initialization.
-      ITrackRecordingService trackRecordingService =
-          ITrackRecordingService.Stub.asInterface(service);
-      try {
-        // TODO: Send a start service intent and broadcast service started
-        // message to avoid the hack below and a race condition.
-        if (startNewTrackRequested) {
-          startNewTrackRequested = false;
-          startRecordingNewTrack(trackRecordingService);
-        }
-      } finally {
-        MyTracks.this.trackRecordingService = trackRecordingService;
-      }
-    }
-
-    @Override
-    public void onServiceDisconnected(ComponentName className) {
-      Log.d(TAG, "MyTracks: Service now disconnected.");
-      trackRecordingService = null;
-    }
-  };
-
-  /**
-   * Whether {@link #serviceConnection} is bound or not.
-   */
-  private boolean isBound = false;
+  private TrackRecordingServiceBinder serviceBinder;
 
   /*
    * Tabs/View navigation:
@@ -135,6 +97,18 @@ public class MyTracks extends TabActivity implements OnTouchListener {
     }
   };
 
+  private final Runnable serviceBindCallback = new Runnable() {
+    @Override
+    public void run() {
+      synchronized (serviceBinder) {
+        ITrackRecordingService service = serviceBinder.getServiceIfBound();
+        if (startNewTrackRequested && service != null) {
+          startRecordingNewTrack(service);
+        }
+      }
+    }
+  };
+
   /**
    * Checks whether we have a track recording session in progress.
    * In some cases, when the service has crashed or has been restarted
@@ -145,6 +119,7 @@ public class MyTracks extends TabActivity implements OnTouchListener {
    *         based on settings from the shared preferences.
    */
   public boolean isRecording() {
+    ITrackRecordingService trackRecordingService = serviceBinder.getServiceIfBound();
     if (trackRecordingService == null) {
       // Fall back to alternative check method.
       return dataHub.isRecording();
@@ -177,10 +152,10 @@ public class MyTracks extends TabActivity implements OnTouchListener {
     }
 
     providerUtils = MyTracksProviderUtils.Factory.get(this);
-    sharedPreferences = getSharedPreferences(Constants.SETTINGS_NAME, 0);
-    dataHub = new TrackDataHub(this, sharedPreferences, providerUtils);
+    dataHub = new TrackDataHub(this, providerUtils);
     menuManager = new MenuManager(this);
     dialogManager = new DialogManager(this);
+    serviceBinder = TrackRecordingServiceBinder.getInstance(this);
 
     // The volume we want to control is the Text-To-Speech volume
     int volumeStream =
@@ -230,7 +205,6 @@ public class MyTracks extends TabActivity implements OnTouchListener {
 
     dataHub.destroy();
 
-    tryUnbindTrackRecordingService();
     super.onDestroy();
   }
 
@@ -250,7 +224,7 @@ public class MyTracks extends TabActivity implements OnTouchListener {
     // Called when activity is going into the background, but has not (yet) been
     // killed. Shouldn't block longer than approx. 2 seconds.
     Log.d(TAG, "MyTracks.onPause");
-    tryUnbindTrackRecordingService();
+    serviceBinder.unbindService();
     super.onPause();
   }
 
@@ -259,7 +233,7 @@ public class MyTracks extends TabActivity implements OnTouchListener {
     // Called when the current activity is being displayed or re-displayed
     // to the user.
     Log.d(TAG, "MyTracks.onResume");
-    tryBindTrackRecordingService();
+    serviceBinder.bindService(serviceBindCallback);
     super.onResume();
   }
 
@@ -271,8 +245,7 @@ public class MyTracks extends TabActivity implements OnTouchListener {
 
     // Ensure that service is running if we're supposed to be recording
     if (dataHub.isRecording()) {
-      Intent startIntent = new Intent(this, TrackRecordingService.class);
-      startService(startIntent);
+      serviceBinder.startService();
     }
 
     Intent intent = getIntent();
@@ -445,6 +418,7 @@ public class MyTracks extends TabActivity implements OnTouchListener {
    * @throws RemoteException If the call on the service failed.
    */
   public long insertWaypoint(WaypointCreationRequest request) throws RemoteException {
+    ITrackRecordingService trackRecordingService = serviceBinder.getServiceIfBound();
     if (trackRecordingService == null) {
       throw new IllegalStateException("The recording service is not bound.");
     }
@@ -485,14 +459,16 @@ public class MyTracks extends TabActivity implements OnTouchListener {
    * Starts the track recording service (if not already running) and binds to
    * it. Starts recording a new track.
    */
-  public void startRecording() {
-    if (trackRecordingService == null) {
+  void startRecording() {
+    synchronized (serviceBinder) {
       startNewTrackRequested = true;
-      Intent startIntent = new Intent(this, TrackRecordingService.class);
-      startService(startIntent);
-      tryBindTrackRecordingService();
-    } else {
-      startRecordingNewTrack(trackRecordingService);
+      serviceBinder.startService();
+
+      // Binding was already requested before, it either already happened
+      // (in which case running the callback manually triggers the actual recording start)
+      // or it will happen in the future
+      // (in which case running the callback now will have no effect).
+      serviceBindCallback.run();
     }
   }
 
@@ -501,8 +477,10 @@ public class MyTracks extends TabActivity implements OnTouchListener {
    * "Stopped recording" and pop up the Track Details activity.
    */
   public void stopRecording() {
+    ITrackRecordingService trackRecordingService = serviceBinder.getServiceIfBound();
     if (trackRecordingService != null) {
       // Save the track id as the shared preference will overwrite the recording track id.
+      SharedPreferences sharedPreferences = getSharedPreferences(Constants.SETTINGS_NAME, 0);
       long currentTrackId = sharedPreferences.getLong(getString(R.string.recording_track_key), -1);
       try {
         trackRecordingService.endCurrentTrack();
@@ -519,14 +497,10 @@ public class MyTracks extends TabActivity implements OnTouchListener {
         startActivity(intent);
       }
     }
-    tryUnbindTrackRecordingService();
-    try {
-      stopService(new Intent(MyTracks.this, TrackRecordingService.class));
-    } catch (SecurityException e) {
-      Log.e(TAG, "Encountered a security exception when trying to stop service.", e);
-    }
-    trackRecordingService = null;
+
+    serviceBinder.stopService();
   }
+
   void clearSelectedTrack() {
     dataHub.unloadCurrentTrack();
   }
@@ -535,54 +509,10 @@ public class MyTracks extends TabActivity implements OnTouchListener {
     return dataHub.getSelectedTrackId();
   }
 
-  /**
-   * Binds to track recording service if it is running.
-   */
-  private void tryBindTrackRecordingService() {
-    Log.d(TAG,
-        "MyTracks: Trying to bind to track recording service...");
-    bindService(new Intent(this, TrackRecordingService.class),
-        serviceConnection, 0);
-    Log.d(TAG, "MyTracks: ...bind finished!");
-    isBound = true;
-  }
-
-  /**
-   * Tries to unbind the track recording service. Catches exception silently in
-   * case service is not registered anymore.
-   */
-  private void tryUnbindTrackRecordingService() {
-    if (isBound) {
-      Log.d(TAG, "MyTracks: Trying to unbind from track recording service...");
-      try {
-        unbindService(serviceConnection);
-        Log.d(TAG, "MyTracks: ...unbind finished!");
-      } catch (IllegalArgumentException e) {
-        Log.d(TAG, "MyTracks: Tried unbinding, but service was not registered.", e);
-      }
-      isBound = false;
-    }
-  }
-
   public DialogManager getDialogManager() {
     return dialogManager;
   }
 
-  // @VisibleForTesting
-  long getRecordingTrackId() {
-    return sharedPreferences.getLong(getString(R.string.recording_track_key), -1);
-  }
-  
-  // @VisibleForTesting
-  SharedPreferences getSharedPreferences() {
-    return sharedPreferences;
-  }
-  
-  // @VisibleForTesting
-  ITrackRecordingService getTrackRecordingService() {
-    return trackRecordingService;
-  }
-
   public TrackDataHub getDataHub() {
     return dataHub;
   }
@@ -593,8 +523,4 @@ public class MyTracks extends TabActivity implements OnTouchListener {
   public static MyTracks getInstance() {
     return instance;
   }
-
-  public static void clearInstance() {
-    instance = null;
-  }
 }

MyTracks/src/com/google/android/apps/mytracks/SensorStateActivity.java

@@ -18,6 +18,7 @@ package com.google.android.apps.mytracks;
 import static com.google.android.apps.mytracks.Constants.TAG;
 import com.google.android.apps.mytracks.content.Sensor;
 import com.google.android.apps.mytracks.services.ITrackRecordingService;
+import com.google.android.apps.mytracks.services.TrackRecordingServiceBinder;
 import com.google.android.apps.mytracks.services.sensors.SensorUtils;
 import com.google.android.maps.mytracks.R;
 import com.google.protobuf.InvalidProtocolBufferException;
@@ -45,6 +46,7 @@ public class SensorStateActivity extends Activity {
   private static final long REFRESH_PERIOD_MS = 250;
 
   private final StatsUtilities utils;
+  private TrackRecordingServiceBinder serviceBinder;
 
   /**
    * This timer periodically invokes the refresh timer task.
@@ -79,6 +81,8 @@ public class SensorStateActivity extends Activity {
 
     setContentView(R.layout.sensor_state);
 
+    serviceBinder = TrackRecordingServiceBinder.getInstance(this);
+    serviceBinder.bindService(stateUpdater);
     updateState();
   }
 
@@ -97,11 +101,13 @@ public class SensorStateActivity extends Activity {
     timer = null;
   }
 
-  protected void updateState() {
-    MyTracks mt = MyTracks.getInstance();
+  @Override
+  protected void onDestroy() {
+    serviceBinder.unbindService();
+  }
 
-    ITrackRecordingService service =
-    	mt == null ? null : mt.getTrackRecordingService();
+  protected void updateState() {
+    ITrackRecordingService service = serviceBinder.getServiceIfBound();
     if (service == null) {
       Log.d(Constants.TAG, "Could not get track recording service.");
       updateSensorState(Sensor.SensorState.NONE);

MyTracks/src/com/google/android/apps/mytracks/content/TrackDataHub.java

@@ -22,6 +22,7 @@ import static com.google.android.apps.mytracks.Constants.MAX_LOCATION_AGE_MS;
 import static com.google.android.apps.mytracks.Constants.MAX_NETWORK_AGE_MS;
 import static com.google.android.apps.mytracks.Constants.TAG;
 
+import com.google.android.apps.mytracks.Constants;
 import com.google.android.apps.mytracks.content.DataSourceManager.DataSourceListener;
 import com.google.android.apps.mytracks.content.MyTracksProviderUtils.DoubleBufferedLocationFactory;
 import com.google.android.apps.mytracks.content.MyTracksProviderUtils.LocationIterator;
@@ -195,10 +196,17 @@ public class TrackDataHub {
   /**
    * Default constructor.
    */
-  public TrackDataHub(Context ctx, SharedPreferences preferences,
+  public TrackDataHub(Context ctx, MyTracksProviderUtils providerUtils) {
+    this(ctx, ctx.getSharedPreferences(Constants.SETTINGS_NAME, 0), providerUtils);
+  }
+
+  /**
+   * Intermediate constructor, used only for passing preferences into arguments.
+   */
+  private TrackDataHub(Context ctx, SharedPreferences preferences,
       MyTracksProviderUtils providerUtils) {
     this(ctx, new DataSourcesWrapperImpl(ctx, preferences), new TrackDataListeners(),
-         preferences, providerUtils, TARGET_DISPLAYED_TRACK_POINTS);
+        preferences, providerUtils, TARGET_DISPLAYED_TRACK_POINTS);
   }
 
   /**

MyTracks/src/com/google/android/apps/mytracks/services/TrackRecordingService.java

@@ -785,7 +785,7 @@ public class TrackRecordingService extends Service implements LocationListener {
     if (intent != null &&
         intent.getBooleanExtra(RESUME_TRACK_EXTRA_NAME, false)) {
       Log.d(TAG, "TrackRecordingService: requested resume");
-      
+
       // Make sure that the current track exists and is fresh enough.
       if (recordingTrack == null || !shouldResumeTrack(recordingTrack)) {
         Log.i(TAG,
@@ -796,7 +796,7 @@ public class TrackRecordingService extends Service implements LocationListener {
         stopSelfResult(startId);
         return;
       }
-      
+
       Log.i(TAG, "TrackRecordingService: resuming");
     }
   }

MyTracks/src/com/google/android/apps/mytracks/services/TrackRecordingServiceBinder.java

@@ -0,0 +1,203 @@
+/*
+ * Copyright 2011 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.services;
+
+import static com.google.android.apps.mytracks.Constants.TAG;
+
+import com.google.android.apps.mytracks.Constants;
+import com.google.android.apps.mytracks.util.SystemUtils;
+
+import android.content.ComponentName;
+import android.content.Context;
+import android.content.Intent;
+import android.content.ServiceConnection;
+import android.os.IBinder;
+import android.util.Log;
+
+import java.util.WeakHashMap;
+
+/**
+ * A helper for managing the binding to the track recording service.
+ * This uses reference counting so multiple callers can share a binding.
+ *
+ * @author Rodrigo Damazio
+ */
+public class TrackRecordingServiceBinder {
+  /** Singleton instance. */
+  private static TrackRecordingServiceBinder instance;
+
+  private final ServiceConnection serviceConnection = new ServiceConnection() {
+    @Override
+    public void onServiceConnected(ComponentName className, IBinder service) {
+      Log.d(Constants.TAG, "Service now connected.");
+
+      // Delay setting the service until we are done with initialization.
+      ITrackRecordingService trackRecordingService =
+          ITrackRecordingService.Stub.asInterface(service);
+      synchronized (TrackRecordingServiceBinder.this) {
+        try {
+          for (Runnable callback : pendingBindCallbacks.keySet()) {
+            if (callback != null) {
+              callback.run();
+            }
+          }
+        } finally {
+          pendingBindCallbacks.clear();
+          TrackRecordingServiceBinder.this.trackRecordingService = trackRecordingService;
+        }
+      }
+    }
+
+    @Override
+    public void onServiceDisconnected(ComponentName className) {
+      Log.d(TAG, "Service now disconnected.");
+      synchronized (TrackRecordingServiceBinder.this) {
+        trackRecordingService = null;
+      }
+    }
+  };
+
+  /** Pointer to the service, if bound. */
+  private ITrackRecordingService trackRecordingService;
+
+  /** Count of bindings to the service. */
+  private int bindCount = 0;
+
+  /** Set of callbacks to execute when the service connects. */
+  private final WeakHashMap<Runnable, Object> pendingBindCallbacks =
+      new WeakHashMap<Runnable, Object>();
+
+  /** Application context. */
+  private final Context applicationContext;
+
+  /**
+   * Starts the service with the default intent.
+   *
+   * This should only be called when the service will be put in recording mode,
+   * as the service being started means it'll be listening to the GPS.
+   * Notice that it is perfectly fine to call {@link #bindService} without calling
+   * this at all.
+   */
+  public void startService() {
+    Intent intent = new Intent(applicationContext, TrackRecordingService.class);
+    applicationContext.startService(intent);
+  }
+
+  /**
+   * Binds to the service, and calls the given callback afterwards.
+   * Calls to this method should be balanced with calls to {@link #unbindService}.
+   * 
+   * @param onBindCallback the callback for when the service is connected
+   */
+  public void bindService(Runnable onBindCallback) {
+    synchronized (this) {
+      bindCount++;
+      if (trackRecordingService != null) {
+        if (onBindCallback != null) {
+          onBindCallback.run();
+        }
+        return;
+      }
+
+      if (onBindCallback != null) {
+        pendingBindCallbacks.put(onBindCallback, null);
+      }
+
+      if (bindCount == 1) {
+        Intent intent = new Intent(applicationContext, TrackRecordingService.class);
+        int flags = SystemUtils.isRelease(applicationContext) ? 0 : Context.BIND_DEBUG_UNBIND; 
+        applicationContext.bindService(intent, serviceConnection, flags);
+      }
+    }
+  }
+
+  /**
+   * Unbinds from the service.
+   *
+   * This will unbind from the service, unless another caller is still bound to it.
+   * Calls to this method should be balanced with calls to {@link #bindService}.
+   */
+  public void unbindService() {
+    synchronized (this) {
+      bindCount--;
+      if (bindCount > 0) {
+        // Someone else may still be using it.
+        return;
+      } else if (bindCount < 0) {
+        Log.e(TAG, "Unbalanced binding calls.");
+        return;
+      }
+
+      try {
+        applicationContext.unbindService(serviceConnection);
+      } catch (IllegalArgumentException e) {
+        Log.d(TAG, "Tried unbinding, but service was not registered.", e);
+      }
+    }
+  }
+
+  /**
+   * Stops the service, and consequently its GPS listening.
+   */
+  public void stopService() {
+    try {
+      applicationContext.stopService(new Intent(applicationContext, TrackRecordingService.class));
+    } catch (SecurityException e) {
+      Log.e(TAG, "Encountered a security exception when trying to stop service.", e);
+    }
+  }
+
+  @Override
+  protected void finalize() throws Throwable {
+    if (bindCount > 0) {
+      Log.e(TAG, "Leaked bindings: " + bindCount + " bindings left on finalize.");
+    }
+
+    super.finalize();
+  }
+
+  /**
+   * Returns the connected service instance, or null if not connected.
+   */
+  public ITrackRecordingService getServiceIfBound() {
+    return trackRecordingService;
+  }
+
+  /**
+   * Returns the singleton instance of this class.
+   * Notice that although a context is required, it is safe to call this from
+   * multiple different contexts to obtain the same instance.
+   *
+   * @param context the current context
+   * @return the singleton instance
+   */
+  public synchronized static TrackRecordingServiceBinder getInstance(Context context) {
+    if (instance == null) {
+      Context applicationContext = context.getApplicationContext();
+      instance = new TrackRecordingServiceBinder(applicationContext);
+    }
+    return instance;
+  }
+
+  /**
+   * Internal constructor.
+   *
+   * @param applicationContext the current application (not activity) context
+   */
+  private TrackRecordingServiceBinder(Context applicationContext) {
+    this.applicationContext = applicationContext;
+  }
+}

MyTracksTest/src/com/google/android/apps/mytracks/MyTracksTest.java

@@ -36,56 +36,48 @@ import java.util.concurrent.atomic.AtomicBoolean;
  * @author Bartlomiej Niechwiej
  */
 public class MyTracksTest extends ActivityInstrumentationTestCase2<MyTracks>{
+  private SharedPreferences sharedPreferences;
+
   public MyTracksTest() {
     super(MyTracks.class);
   }
 
-  @Override
-  protected void setUp() throws Exception {
-    super.setUp();
-    MyTracks.clearInstance();
-    assertNull(MyTracks.getInstance());
-  }
-
   @Override
   protected void tearDown() throws Exception {
     clearSelectedAndRecordingTracks();
     waitForIdle();
+
     super.tearDown();
   }
-  
+
   public void testInitialization_mainAction() {
     // Make sure we can start MyTracks and the activity doesn't start recording.
-    assertNotNull(getActivity());
-    assertNotNull(MyTracks.getInstance());
-    assertNotNull(getActivity().getSharedPreferences());
-    
+    assertInitialized();
+
     // Check if not recording.
     assertFalse(getActivity().isRecording());
-    assertEquals(-1, getActivity().getRecordingTrackId());
-    long selectedTrackId = getActivity().getSharedPreferences().getLong(
+    assertEquals(-1, getRecordingTrackId());
+    long selectedTrackId = getSharedPreferences().getLong(
         getActivity().getString(R.string.selected_track_key), -1);
     assertEquals(selectedTrackId, getActivity().getSelectedTrackId());
   }
-  
+
   public void testInitialization_viewActionWithNoData() {
     // Simulate start with ACTION_VIEW intent.
     Intent startIntent = new Intent();
     startIntent.setAction(Intent.ACTION_VIEW);
     setActivityIntent(startIntent);
-    
-    assertNotNull(getActivity());
-    assertNotNull(MyTracks.getInstance());
-    assertNotNull(getActivity().getSharedPreferences());
-    
+
+    assertInitialized();
+
     // Check if not recording.
     assertFalse(getActivity().isRecording());
-    assertEquals(-1, getActivity().getRecordingTrackId());
-    long selectedTrackId = getActivity().getSharedPreferences().getLong(
+    assertEquals(-1, getRecordingTrackId());
+    long selectedTrackId = getSharedPreferences().getLong(
         getActivity().getString(R.string.selected_track_key), -1);
     assertEquals(selectedTrackId, getActivity().getSelectedTrackId());
   }
-  
+
   public void testInitialization_viewActionWithValidData() throws Exception {
     // Simulate start with ACTION_VIEW intent.
     Intent startIntent = new Intent();
@@ -93,24 +85,22 @@ public class MyTracksTest extends ActivityInstrumentationTestCase2<MyTracks>{
     Uri uri = Uri.fromFile(File.createTempFile("valid", ".gpx"));
 
     // TODO: Add a valid GPX.
-    
+
     startIntent.setData(uri);
     setActivityIntent(startIntent);
-    
-    assertNotNull(getActivity());
-    assertNotNull(MyTracks.getInstance());
-    assertNotNull(getActivity().getSharedPreferences());
-    
+
+    assertInitialized();
+
     // Check if not recording.
     assertFalse(getActivity().isRecording());
-    assertEquals(-1, getActivity().getRecordingTrackId());
-    long selectedTrackId = getActivity().getSharedPreferences().getLong(
+    assertEquals(-1, getRecordingTrackId());
+    long selectedTrackId = getSharedPreferences().getLong(
         getActivity().getString(R.string.selected_track_key), -1);
     assertEquals(selectedTrackId, getActivity().getSelectedTrackId());
-    
-   // TODO: Finish this test.
+
+    // TODO: Finish this test.
   }
-  
+
   public void testInitialization_viewActionWithInvalidData() throws Exception {
     // Simulate start with ACTION_VIEW intent.
     Intent startIntent = new Intent();
@@ -118,34 +108,29 @@ public class MyTracksTest extends ActivityInstrumentationTestCase2<MyTracks>{
     Uri uri = Uri.fromFile(File.createTempFile("invalid", ".gpx"));
     startIntent.setData(uri);
     setActivityIntent(startIntent);
-    
-    assertNotNull(getActivity());
-    assertNotNull(MyTracks.getInstance());
-    assertNotNull(getActivity().getSharedPreferences());
-    
+
+    assertInitialized();
+
     // Check if not recording.
     assertFalse(getActivity().isRecording());
-    assertEquals(-1, getActivity().getRecordingTrackId());
-    long selectedTrackId = getActivity().getSharedPreferences().getLong(
+    assertEquals(-1, getRecordingTrackId());
+    long selectedTrackId = getSharedPreferences().getLong(
         getActivity().getString(R.string.selected_track_key), -1);
     assertEquals(selectedTrackId, getActivity().getSelectedTrackId());
-    
+
     // TODO: Finish this test.
   }
-  
+
   public void testRecording_startAndStop() throws Exception {
-    // Make sure we can start MyTracks and the activity doesn't start recording.
-    assertNotNull(getActivity());
-    assertNotNull(MyTracks.getInstance());
-    assertNotNull(getActivity().getSharedPreferences());
+    assertInitialized();
 
     // Check if not recording.
     clearSelectedAndRecordingTracks();    
     waitForIdle();
 
     assertFalse(getActivity().isRecording());
-    assertEquals(-1, getActivity().getRecordingTrackId());
-    long selectedTrackId = getActivity().getSharedPreferences().getLong(
+    assertEquals(-1, getRecordingTrackId());
+    long selectedTrackId = getSharedPreferences().getLong(
         getActivity().getString(R.string.selected_track_key), -1);
     assertEquals(selectedTrackId, getActivity().getSelectedTrackId());
 
@@ -153,16 +138,16 @@ public class MyTracksTest extends ActivityInstrumentationTestCase2<MyTracks>{
     getActivity().startRecording();
     long recordingTrackId = awaitRecordingStatus(5000, true);
     assertTrue(recordingTrackId >= 0);
-    
+
     // Wait until we are done and make sure that selectedTrack = recordingTrack.
     waitForIdle();
-    assertEquals(recordingTrackId, getActivity().getSharedPreferences().getLong(
+    assertEquals(recordingTrackId, getSharedPreferences().getLong(
         getActivity().getString(R.string.recording_track_key), -1));
-    selectedTrackId = getActivity().getSharedPreferences().getLong(
+    selectedTrackId = getSharedPreferences().getLong(
         getActivity().getString(R.string.selected_track_key), -1);
     assertEquals(recordingTrackId, selectedTrackId);
     assertEquals(selectedTrackId, getActivity().getSelectedTrackId());
-    
+
     // Watch for MyTracksDetails activity. 
     ActivityMonitor monitor = getInstrumentation().addMonitor(
         TrackDetails.class.getName(), null, false);
@@ -170,14 +155,14 @@ public class MyTracksTest extends ActivityInstrumentationTestCase2<MyTracks>{
     // Now, stop the track and make sure that it is still selected, but
     // no longer recording.
     getActivity().stopRecording();
-    
+
     // Check if we got back MyTracksDetails activity. 
     Activity activity = getInstrumentation().waitForMonitor(monitor);
     assertTrue(activity instanceof TrackDetails);
-    
+
     // TODO: Update track name and other properties and test if they were
     // properly saved.
-    
+
     // Simulate a click on Save button.
     Button save = (Button) activity.findViewById(R.id.trackdetails_save);
     save.performClick();
@@ -185,13 +170,18 @@ public class MyTracksTest extends ActivityInstrumentationTestCase2<MyTracks>{
     // Check the remaining properties.
     recordingTrackId = awaitRecordingStatus(5000, false);
     assertEquals(-1, recordingTrackId);
-    assertEquals(recordingTrackId, getActivity().getRecordingTrackId());
-    assertEquals(recordingTrackId, getActivity().getSharedPreferences().getLong(
+    assertEquals(recordingTrackId, getRecordingTrackId());
+    assertEquals(recordingTrackId, getSharedPreferences().getLong(
         getActivity().getString(R.string.recording_track_key), -1));
     // Make sure this is the same track as the last recording track ID.
     assertEquals(selectedTrackId, getActivity().getSelectedTrackId());
   }
-  
+
+  private void assertInitialized() {
+    assertNotNull(getActivity());
+    assertNotNull(MyTracks.getInstance());
+  }
+
   /**
    * Waits until the UI thread becomes idle.
    */
@@ -216,13 +206,13 @@ public class MyTracksTest extends ActivityInstrumentationTestCase2<MyTracks>{
   }
 
   /**
-   * Clears {selected,recording}TrackId in the {@link SharedPreferences}.
+   * Clears {selected,recording}TrackId in the {@link getSharedPreferences()}.
    */
   private void clearSelectedAndRecordingTracks() {
-    Editor editor = getActivity().getSharedPreferences().edit();
+    Editor editor = getSharedPreferences().edit();
     editor.putLong(getActivity().getString(R.string.selected_track_key), -1);
     editor.putLong(getActivity().getString(R.string.recording_track_key), -1);
-    
+
     editor.clear();
     editor.commit();
   }
@@ -245,6 +235,17 @@ public class MyTracksTest extends ActivityInstrumentationTestCase2<MyTracks>{
     }
     waitForIdle();
     assertEquals(isRecording, getActivity().isRecording());
-    return getActivity().getRecordingTrackId();
+    return getRecordingTrackId();
+  }
+
+  private long getRecordingTrackId() {
+    return getSharedPreferences().getLong(getActivity().getString(R.string.recording_track_key), -1);
+  }
+
+  private SharedPreferences getSharedPreferences() {
+    if (sharedPreferences == null) {
+      sharedPreferences = getActivity().getSharedPreferences(Constants.SETTINGS_NAME, 0);
+    }
+    return sharedPreferences;
   }
 }