MainActivity.java

package co.developertime.android.recon;

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.location.Criteria;
import android.location.Location;
import android.location.LocationManager;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.TextView;

import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.common.api.GoogleApiClient.ConnectionCallbacks;
import com.google.android.gms.common.api.GoogleApiClient.OnConnectionFailedListener;
import com.google.android.gms.location.LocationListener;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.location.LocationServices;

public class MainActivity extends Activity
        implements ConnectionCallbacks,
        OnConnectionFailedListener,
        LocationListener {

    private final static String TAG = "MainActivity";
    public final static String EXTRA_MESSAGE = "co.developertime.android.MESSAGE";

    // Views
    private TextView mMessageTextView;
    private TextView mLocationLongtitudeTextView;
    private TextView mLocationLatitudeTextView;

    private LocationRequest mLocationRequest;
    private GoogleApiClient mGoogleApiClient;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        // Fetch references to views
        mMessageTextView = (TextView) findViewById(R.id.edit_message);
        mLocationLongtitudeTextView = (TextView) findViewById(R.id.location_longtitude_text_view);
        mLocationLatitudeTextView = (TextView) findViewById(R.id.location_latitude_text_view);

        Log.i(TAG, "onCreate()");

        mGoogleApiClient = new GoogleApiClient.Builder(this)
                .addApi(LocationServices.API)
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this)
                .build();
        if (mGoogleApiClient != null) {
            mGoogleApiClient.connect();
        }
    }

    @Override
    protected void onStart() {
        super.onStart();
    }

    @Override
    protected void onPause() {
        super.onPause();
    }

    @Override
    protected void onStop() {
        super.onStop();
        if (mGoogleApiClient.isConnected()) {
            mGoogleApiClient.disconnect();
        }
    }

    // View callbacks
    public void sendMessage(View view) {
        Log.i(TAG, "sendMessage");

        Intent intent = new Intent(this, DisplayMessageActivity.class);

        String message = mMessageTextView.getText().toString();
        intent.putExtra(EXTRA_MESSAGE, message);

        startActivity(intent);
    }

    @Override
    public void onConnected(Bundle bundle) {
        Log.i(TAG, "onConnected()");

        Location lastLocation = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
        Log.i(TAG, "mGoogleApiClient.isConnected(): " + mGoogleApiClient.isConnected());
        Log.i(TAG, "lastLocation: " + lastLocation);

        if (lastLocation != null) {
            String latitude = String.valueOf(lastLocation.getLatitude());
            String longtitude = String.valueOf(lastLocation.getLongitude());

            mLocationLongtitudeTextView.setText(longtitude);
            mLocationLatitudeTextView.setText(latitude);
        } else {
            createLocationRequest();
            startLocationUpdates();
        }
    }

    protected void createLocationRequest() {
        mLocationRequest = new LocationRequest();
        mLocationRequest.setInterval(10000);
        mLocationRequest.setFastestInterval(5000);
        mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
    }
    protected void startLocationUpdates() {
        LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
    }

    @Override
    public void onConnectionSuspended(int i) {
        Log.i(TAG, "onConnectionSuspended()");
    }

    @Override
    public void onConnectionFailed(ConnectionResult connectionResult) {
        Log.i(TAG, "onConnectionFailed()");
    }

    @Override
    public void onLocationChanged(Location location) {
        Log.i(TAG, "onLocationChanged() " + location.getLatitude());
    }
}