我正在建立一个gps应用程序，但GoogleAppClient已被弃用，我不知道如何修复它。另外，当我运行这个应用程序时，我得到一个登录按钮，它不会导致任何结果，这可能与此有关，因为我知道googlesigninclient存在。另外，如果你能给我链接到一个更详细的解释googleapi我真的很感激！

public static final String MA = "MainActivity";
private final static int REQUEST_CODE = 100;
private GoogleApiClient gac;
private Location location;
private TextView locationTV;
private TextView distanceTV;
private TextView addressET;
private TextView timeLeftTV;
private String destinationAddress = "";
private TravelManager manager;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    locationTV = (TextView) findViewById(R.id.location_tv);
    manager = new TravelManager();
    addressET = (EditText) findViewById(R.id.destination_et);
    distanceTV = (TextView) findViewById(R.id.distance_tv);
    timeLeftTV = (TextView) findViewById(R.id.time_left_tv);

    gac = new GoogleApiClient.Builder(this).addConnectionCallbacks(this).addOnConnectionFailedListener(this).addApi(LocationServices.API).build();
}

public void updateTrip(View v) {
    String address = addressET.getText().toString();
    boolean goodGeoCoding = true;
    if (!address.equals(destinationAddress)) {
        destinationAddress = address;
        Geocoder geocoder = new Geocoder(this);
        try {
            List<Address> addresses = geocoder.getFromLocationName(destinationAddress, 5);
            if (address != null) {
                double latitude = addresses.get(0).getLatitude();
                double longitude = addresses.get(0).getLongitude();
                Location destinationLocation = new Location("destination");
                destinationLocation.setLatitude(latitude);
                destinationLocation.setLongitude(longitude);
                manager.setDestination(destinationLocation);
            }
        } catch (IOException ioException) {
            goodGeoCoding = false;
        }
    }

    FusedLocationProviderApi fusedLocationProviderApi = LocationServices.FusedLocationApi;
    if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
        // TODO: Consider calling
        //    ActivityCompat#requestPermissions
        // here to request the missing permissions, and then overriding
        //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
        //                                          int[] grantResults)
        // to handle the case where the user grants the permission. See the documentation
        // for ActivityCompat#requestPermissions for more details.
        return;
    }
    Location current = fusedLocationProviderApi.getLastLocation(gac);
    if (current != null && goodGeoCoding) {
        distanceTV.setText(manager.milesToDestination(current));
        timeLeftTV.setText(manager.timeToDestination(current));
    }
}

public void displayLocation() {
    FusedLocationProviderApi fusedLocationProviderApi = LocationServices.FusedLocationApi;
    if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
        // TODO: Consider calling
        //    ActivityCompat#requestPermissions
        // here to request the missing permissions, and then overriding
        //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
        //                                          int[] grantResults)
        // to handle the case where the user grants the permission. See the documentation
        // for ActivityCompat#requestPermissions for more details.
        return;
    }
    location = fusedLocationProviderApi.getLastLocation(gac);

    if (location != null) {
        double latitude = location.getLatitude();
        double longitude = location.getLongitude();
        locationTV.setText(latitude + ", " + longitude);
        Log.w(MA, "latutude = " + latitude + "; longitude = " + longitude);
    }else
        locationTV.setText("Error locating the device");
}

public void onConnected(Bundle hint) {
    Log.w(MA, "connected");
    displayLocation();
}

public void onConnectionSuspended(int cause) {
    Log.w(MA, "connection suspended");
}

public void onConnectionFailed(ConnectionResult result) {
    Log.w(MA, "connection failed");
    if (result.hasResolution()){
        try {
            result.startResolutionForResult(this, REQUEST_CODE);
        }catch (IntentSender.SendIntentException sendIntentException) {
            Toast.makeText(this,"Google Play services problem, exiting", Toast.LENGTH_LONG).show();
            finish();
        }
    }
}

public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (requestCode == REQUEST_CODE && resultCode == RESULT_OK) {
        gac.connect();
    }
}

protected void onStart() {
    super.onStart();
    if (gac != null)
        gac.connect();
}

}