android - 如何在 Activity 中使用 Android Location Helper 类

Question

我想在多个 Activity 中访问设备的当前位置。目前我在一个 Activity 中使用 Google FusedLocationProvider。我正在研究如何使用 util/helper 类来获取设备的当前位置以用于不同的 Activity 。我找到了一个帮助程序类，但不确定如何从 Activity 中使用它。请帮助我朝着正确的方向前进。

定位器.java

public class Locator implements LocationListener {

static private final String LOG_TAG = "locator";

static private final int TIME_INTERVAL = 100; // minimum time between updates in milliseconds
static private final int DISTANCE_INTERVAL = 1; // minimum distance between updates in meters

static public enum Method {
    NETWORK,
    GPS,
    NETWORK_THEN_GPS
}

private Context context;
private LocationManager locationManager;
private Locator.Method method;
private Locator.Listener callback;

public Locator(Context context) {
    super();
    this.context = context;
    this.locationManager = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
}

public void getLocation(Locator.Method method, Locator.Listener callback) {
    this.method = method;
    this.callback = callback;
    switch (this.method) {
        case NETWORK:
        case NETWORK_THEN_GPS:
            Location networkLocation = this.locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
            if (networkLocation != null) {
                Log.d(LOG_TAG, "Last known location found for network provider : " + networkLocation.toString());
                this.callback.onLocationFound(networkLocation);
            } else {
                Log.d(LOG_TAG, "Request updates from network provider.");
                this.requestUpdates(LocationManager.NETWORK_PROVIDER);
            }
            break;
        case GPS:
            Location gpsLocation = this.locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
            if (gpsLocation != null) {
                Log.d(LOG_TAG, "Last known location found for GPS provider : " + gpsLocation.toString());
                this.callback.onLocationFound(gpsLocation);
            } else {
                Log.d(LOG_TAG, "Request updates from GPS provider.");
                this.requestUpdates(LocationManager.GPS_PROVIDER);
            }
            break;
    }
}

private void requestUpdates(String provider) {
    if (this.locationManager.isProviderEnabled(provider)) {
        if (provider.contentEquals(LocationManager.NETWORK_PROVIDER)
                && Connectivity.isConnected(this.context)) {
            Log.d(LOG_TAG, "Network connected, start listening : " + provider);
            this.locationManager.requestLocationUpdates(provider, TIME_INTERVAL, DISTANCE_INTERVAL, this);
        } else if (provider.contentEquals(LocationManager.GPS_PROVIDER)
                && Connectivity.isConnectedMobile(this.context)) {
            Log.d(LOG_TAG, "Mobile network connected, start listening : " + provider);
            this.locationManager.requestLocationUpdates(provider, TIME_INTERVAL, DISTANCE_INTERVAL, this);
        } else {
            Log.d(LOG_TAG, "Proper network not connected for provider : " + provider);
            this.onProviderDisabled(provider);
        }
    } else {
        this.onProviderDisabled(provider);
    }
}

public void cancel() {
    Log.d(LOG_TAG, "Locating canceled.");
    this.locationManager.removeUpdates(this);
}

@Override
public void onLocationChanged(Location location) {
    Log.d(LOG_TAG, "Location found : " + location.getLatitude() + ", " + location.getLongitude() + (location.hasAccuracy() ? " : +- " + location.getAccuracy() + " meters" : ""));
    this.locationManager.removeUpdates(this);
    this.callback.onLocationFound(location);
}

@Override
public void onProviderDisabled(String provider) {
    Log.d(LOG_TAG, "Provider disabled : " + provider);
    if (this.method == Locator.Method.NETWORK_THEN_GPS
            && provider.contentEquals(LocationManager.NETWORK_PROVIDER)) {
        // Network provider disabled, try GPS
        Log.d(LOG_TAG, "Requesst updates from GPS provider, network provider disabled.");
        this.requestUpdates(LocationManager.GPS_PROVIDER);
    } else {
        this.locationManager.removeUpdates(this);
        this.callback.onLocationNotFound();
    }
}

@Override
public void onProviderEnabled(String provider) {
    Log.d(LOG_TAG, "Provider enabled : " + provider);
}

@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
    Log.d(LOG_TAG, "Provided status changed : " + provider + " : status : " + status);
}

public interface Listener {
    void onLocationFound(Location location);

    void onLocationNotFound();
}

}

Answer 1

您可以找到答案 here和 here

另外，注意获取位置不应该在你的 Activity 中处理，尽量让你的 View 尽可能转储