Bugfix: TrackRecordingService must handle restarts while recording.

We now store the Track.Id in a sharedPreferences.

Functionality was removed in e09b04308c

Fixes #2333

src/androidTest/java/de/dennisguse/opentracks/services/TrackRecordingServiceRecordingTest.java

@@ -2,6 +2,7 @@ package de.dennisguse.opentracks.services;
 
 import static org.junit.Assert.assertEquals;
 import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
 
 import android.content.Context;
 import android.content.Intent;
@@ -93,6 +94,41 @@ public class TrackRecordingServiceRecordingTest {
         service = startService();
     }
 
+    @MediumTest
+    @Test
+    public void reCreate_not_recording() {
+        // given
+        TrackIdStorage.unset(context);
+
+        assertFalse(service.isRecording());
+
+        // when
+        service.onStartCommand(null, 0, 1);
+
+        // then
+        assertFalse(service.isRecording());
+    }
+
+    @MediumTest
+    @Test
+    public void reCreate_recording() {
+        // given
+        assertFalse(service.isRecording());
+        Track.Id trackId = service.startNewTrack();
+        assertTrue(service.isRecording());
+
+        // when (crash and restart)
+        service.onDestroy();
+        service.onCreate();
+        service.onStartCommand(null, 0, 1);
+
+        // then
+        assertTrue(service.isRecording());
+        assertEquals(trackId, service.getRecordingStatusObservable().getValue().trackId());
+
+        service.endCurrentTrack();
+    }
+
     @MediumTest
     @Test
     public void recording_startStop() {