Track deletion is handled by a service that shows a progress bar on the notification bar. Fixes #735.

src/main/java/de/dennisguse/opentracks/services/TrackDeleteServiceConnection.java

@@ -0,0 +1,70 @@
+package de.dennisguse.opentracks.services;
+
+import android.content.ComponentName;
+import android.content.Context;
+import android.content.Intent;
+import android.content.ServiceConnection;
+import android.os.IBinder;
+
+import androidx.annotation.NonNull;
+
+import java.util.ArrayList;
+
+import de.dennisguse.opentracks.BuildConfig;
+import de.dennisguse.opentracks.content.data.Track;
+
+import static de.dennisguse.opentracks.services.TrackDeleteService.EXTRA_TRACK_IDS;
+
+public class TrackDeleteServiceConnection implements ServiceConnection {
+
+    final private Listener listener;
+    private TrackDeleteService trackDeleteService;
+
+    public TrackDeleteServiceConnection(@NonNull Listener listener) {
+        this.listener = listener;
+    }
+
+    @Override
+    public void onServiceConnected(ComponentName name, IBinder service) {
+        trackDeleteService = ((TrackDeleteService.Binder) service).getService();
+        listener.connected();
+    }
+
+    @Override
+    public void onServiceDisconnected(ComponentName name) {
+        trackDeleteService = null;
+    }
+
+    public void startAndBind(Context context, ArrayList<Track.Id> trackIds) {
+        if (trackDeleteService != null) {
+            return;
+        }
+
+        Intent intent = new Intent(context, TrackDeleteService.class)
+                .putParcelableArrayListExtra(EXTRA_TRACK_IDS, trackIds);
+        context.startService(intent);
+
+        bind(context);
+    }
+
+    public void bind(Context context) {
+        if (trackDeleteService != null) {
+            return;
+        }
+
+        context.bindService(new Intent(context, TrackDeleteService.class), this, BuildConfig.DEBUG ? Context.BIND_DEBUG_UNBIND : 0);
+    }
+
+    public void unbind(Context context) {
+        context.unbindService(this);
+        trackDeleteService = null;
+    }
+
+    public TrackDeleteService getServiceIfBound() {
+        return trackDeleteService;
+    }
+
+    public interface Listener {
+        void connected();
+    }
+}