如何使用 LocationManager 获取初始位置？

Question

到目前为止，我一直在使用GoogleApiClient 获取当前位置，但我刚刚注意到使用LocationManager 使用LocationListener 执行此操作要简单得多，因为它甚至可以检测 GPS 服务何时打开或由用户关闭。

但是在初始化LocationManager 后获取用户的第一个位置时出现问题。

LocationManager 有 4 个听众，但他们都没有给你你的第一个位置。它确实有一个onLocationChanged 监听器，但它仅在您移动时才会激活。

这就是我的使用方式：

// Init LocationManager (needed to track if GPS is turned on or not
locationManager = (LocationManager) getApplicationContext().getSystemService(LOCATION_SERVICE);
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, this);


end of oncreate......


/*
LocationListener (Listening if GPS service is turned on/off)
 */

@Override
public void onProviderEnabled(String provider) {
}

@Override
public void onLocationChanged(Location location) {
}

@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}

@Override
public void onProviderDisabled(String provider) {
}

Answer 1

使用以下方法获取Location对象：

public Location getLocation() {
    try {
        locationManager = (LocationManager) mContext.getSystemService(Context.LOCATION_SERVICE);

        // getting GPS status
        isGPSEnabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);

        Log.v(TAG, "isGPSEnabled =" + isGPSEnabled);

        // getting network status
        isNetworkEnabled = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);

        Log.v(TAG, "isNetworkEnabled =" + isNetworkEnabled);

        this.canGetLocation = true;
        if (isNetworkEnabled) {
            locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, MIN_TIME_BW_UPDATES, MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
            Log.d(TAG, "Network");
            if (locationManager != null) {
                location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
                if (location != null) {
                    latitude = location.getLatitude();
                    longitude = location.getLongitude();
                }
            }
        }
        // if GPS Enabled get lat/long using GPS Services
        if (isGPSEnabled && location == null) {
            locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, MIN_TIME_BW_UPDATES, MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
            Log.d(TAG, "GPS Enabled");
            if (locationManager != null) {
                location = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
                if (location != null) {
                    latitude = location.getLatitude();
                    longitude = location.getLongitude();
                }
            }
        }
    } catch (Exception e) {
        Log.e(TAG, "Location Not Found");
    }
    return location;
}

更多方法getLastKnownLocation，请refer to the docs。