TRACKING APP: work on TrackingActivity

mobile/com.sap.sailing.android.tracking.app/res/layout/fragment_tracking.xml

@@ -97,15 +97,10 @@
             android:paddingLeft="20dp"
             android:text="@string/tracking_time" />
 
-        <View
-            android:layout_width="fill_parent"
-            android:layout_height="1dp"
-            android:background="@android:color/darker_gray" />
-
         <com.sap.sailing.android.tracking.app.views.AutoResizeTextView
             android:id="@+id/tracking_time_label"
             android:layout_width="match_parent"
-            android:layout_height="150dp"
+            android:layout_height="110dp"
             android:gravity="center"
             android:text="00:00:00"
             android:paddingLeft="20dp"

mobile/com.sap.sailing.android.tracking.app/res/values/preferences.xml

@@ -23,4 +23,5 @@
     <string name="preference_gps_fix_fastest_interval_ms_key">gpsFixFastestInterval</string>
     <string name="preference_gps_fastest_fix_interval_ms_default">100</string>
     <string name="preference_battery_is_charging">batteryIsCharging</string>
+    <string name="preference_tracking_timer_started">trackingTimerStarted</string>
 </resources>

mobile/com.sap.sailing.android.tracking.app/src/com/sap/sailing/android/tracking/app/ui/fragments/TrackingFragment.java

@@ -4,6 +4,7 @@ import android.app.AlertDialog;
 import android.content.DialogInterface;
 import android.content.Intent;
 import android.os.Bundle;
+import android.os.Handler;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.View.OnClickListener;
@@ -12,9 +13,14 @@ import android.widget.Button;
 
 import com.sap.sailing.android.tracking.app.R;
 import com.sap.sailing.android.tracking.app.services.TrackingService;
+import com.sap.sailing.android.tracking.app.utils.AppPreferences;
+import com.sap.sailing.android.tracking.app.views.AutoResizeTextView;
 
-public class TrackingFragment extends BaseFragment implements OnClickListener{
+public class TrackingFragment extends BaseFragment implements OnClickListener {
 
+	private TimerRunnable timer;
+	private AppPreferences prefs;
+	
 	@Override
 	public View onCreateView(LayoutInflater inflater, ViewGroup container,
 			Bundle savedInstanceState) {
@@ -22,12 +28,22 @@ public class TrackingFragment extends BaseFragment implements OnClickListener{
 
 		View view = inflater.inflate(R.layout.fragment_tracking, container, false);
 		
-		Button startTracking = (Button) view.findViewById(R.id.stop_tracking);
-		startTracking.setOnClickListener(this);
+		Button stopTracking = (Button) view.findViewById(R.id.stop_tracking);
+		stopTracking.setOnClickListener(this);
 	
+		prefs = new AppPreferences(getActivity());
+		prefs.setTrackingTimerStarted(System.currentTimeMillis());
+		
 		return view;
 	}
 	
+	@Override
+	public void onResume() {
+		super.onResume();
+		timer = new TimerRunnable();
+		timer.start();
+	}
+	
 	@Override
 	public void onClick(View view) {
 		switch (view.getId()) {
@@ -39,6 +55,28 @@ public class TrackingFragment extends BaseFragment implements OnClickListener{
 		}
 	}
 	
+	@Override
+	public void onPause() {
+		super.onPause();
+		timer.stop();
+	}
+	
+	@Override
+	public void onDestroy() {
+		super.onDestroy();
+		timer.stop();
+	}
+	
+	/**
+	 * Update UI with a string containing the time since tracking started, e.g. 01:22:45
+	 */
+	public void updateTimer()
+	{
+		long diff = System.currentTimeMillis() - prefs.getTrackingTimerStarted();
+		AutoResizeTextView textView = (AutoResizeTextView) getActivity().findViewById(R.id.tracking_time_label);
+		textView.setText(getTimeFormatString(diff));
+	}
+	
 	public void userTappedBackButton()
 	{
 		showStopTrackingConfirmationDialog();
@@ -68,4 +106,46 @@ public class TrackingFragment extends BaseFragment implements OnClickListener{
 		dialog.show();
 	}
 	
+	private String getTimeFormatString(long milliseconds) {
+		int seconds = (int) (milliseconds / 1000) % 60 ;
+		int minutes = (int) ((milliseconds / (1000*60)) % 60);
+		int hours   = (int) ((milliseconds / (1000*60*60)) % 24);
+		
+		return String.format(getResources().getConfiguration().locale, "%02d:%02d:%02d", hours, minutes, seconds);
+	}
+	
+	private class TimerRunnable implements Runnable {
+		
+		public Thread t;
+		public volatile boolean running = true;
+		
+		public void start() {
+			running = true;
+			if (t == null) {
+				t = new Thread(this);
+				t.start();
+			}
+		}
+		@Override
+		public void run() {
+			while (running) {
+				getActivity().runOnUiThread(new Runnable() {
+					@Override
+					public void run() {
+						updateTimer();
+					}
+				});
+				try {
+					Thread.sleep(1000);
+				} catch (InterruptedException e) {
+					e.printStackTrace();
+				}
+			}
+		}
+		
+		public void stop()
+		{
+			running = false;
+		}
+	}
 }

mobile/com.sap.sailing.android.tracking.app/src/com/sap/sailing/android/tracking/app/utils/AppPreferences.java

@@ -93,4 +93,14 @@ public class AppPreferences {
     public boolean getEnergySavingEnabledByUser() {
     	return preferences.getBoolean(context.getString(R.string.preference_energy_saving_enabled_key), false);
     }
+    
+    public void setTrackingTimerStarted(long milliseconds)
+    {
+    	preferences.edit().putLong(context.getString(R.string.preference_tracking_timer_started), milliseconds).commit();
+    }
+    
+    public long getTrackingTimerStarted()
+    {
+    	return preferences.getLong(context.getString(R.string.preference_tracking_timer_started), 0);
+    }
 }