RunManager.java

package cn.alphabets.light.location;

import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.location.Location;
import android.location.LocationManager;
import android.util.Log;

public class RunManager {
    private static final String TAG = "light.location";

    public static final String ACTION_LOCATION = "cn.alphabets.light.location.ACTION_LOCATION";


    private static RunManager sRunManager;
    private Context mAppContext;
    private LocationManager mLocationManager;

    private RunManager(Context appContext) {
        mAppContext = appContext;
        mLocationManager = (LocationManager) mAppContext.getSystemService(Context.LOCATION_SERVICE);
    }

    public static RunManager get(Context c) {
        if (sRunManager == null) {
            // we use the application context to avoid leaking activities
            sRunManager = new RunManager(c.getApplicationContext());
        }
        return sRunManager;
    }

    private PendingIntent getLocationPendingIntent(boolean shouldCreate) {
        Intent broadcast = new Intent(ACTION_LOCATION);
        int flags = shouldCreate ? 0 : PendingIntent.FLAG_NO_CREATE;
        return PendingIntent.getBroadcast(mAppContext, 0, broadcast, flags);
    }

    public void startLocationUpdates() {
        String provider = LocationManager.NETWORK_PROVIDER;
        Log.d(TAG, "Using provider " + provider);

        // get the last known location and broadcast it if we have one
        Location lastKnown = mLocationManager.getLastKnownLocation(provider);
        if (lastKnown != null) {
            // reset the time to now
            lastKnown.setTime(System.currentTimeMillis());
            broadcastLocation(lastKnown);
        }
        // start updates from the location manager
        PendingIntent pi = getLocationPendingIntent(true);
        mLocationManager.requestLocationUpdates(provider, 0, 0, pi);
    }

    public void stopLocationUpdates() {
        PendingIntent pi = getLocationPendingIntent(false);
        if (pi != null) {
            mLocationManager.removeUpdates(pi);
            pi.cancel();
        }
    }

    public boolean isTrackingRun() {
        return getLocationPendingIntent(false) != null;
    }

    private void broadcastLocation(Location location) {
        Intent broadcast = new Intent(ACTION_LOCATION);
        broadcast.putExtra(LocationManager.KEY_LOCATION_CHANGED, location);
        mAppContext.sendBroadcast(broadcast);
    }
}