ServiceConnector.java

import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.IBinder;

import java.util.concurrent.CountDownLatch;

public class ServiceConnector<T> {

    private static final String TAG = ServiceConnector.class.getSimpleName();

    private T service;

    CountDownLatch latch = new CountDownLatch(0);

    private ServiceConnection serviceConnection = new ServiceConnection() {
        @Override
        public void onServiceConnected(ComponentName name, IBinder service) {
            LOG.d(TAG + ".onServiceConnected for " + serviceIntent);
            ServiceConnector.this.service = serviceFactory.call(service);
            latch.countDown();
        }

        @Override
        public void onServiceDisconnected(ComponentName name) {
            LOG.d(TAG + ".onServiceDisconnected for " + serviceIntent);
            latch.countDown();
            ServiceConnector.this.service = null;
        }
    };
    private Intent serviceIntent;
    private Func1<IBinder, T> serviceFactory;

    public ServiceConnector(Intent serviceIntent, Func1<IBinder, T> serviceFactory) {
        this.serviceIntent = serviceIntent;
        this.serviceFactory = serviceFactory;
    }


    /**
     * This is blocking call!!!
     * <p/>
     * Should only be called from background thread.
     *
     * @return service
     */
    public T getService(Context context) {
        if (service == null) {
            try {
                latch = new CountDownLatch(1);
                LOG.d(TAG + ".onCreate bind service " + serviceConnection);
                context.bindService(serviceIntent, serviceConnection, Context.BIND_AUTO_CREATE);

                latch.await();
            } catch (InterruptedException e) {
                LOG.e(TAG + ".getService() - interrupted error");
            }
        }
        return service;
    }

    public void unbindService(Context context) {
        context.unbindService(serviceConnection);
    }
}