Kotlin - 从网络提供商获取位置的问题

Question

我必须在我的 Android 应用程序中从用户设备获取位置。

我做了以下事情：

首先，我检查了运行时位置权限。拍摄成功。

第二，检查 GPS 是否启用，如果 GPS PROVIDER 工作正常，可以从 GPS Provider 获取纬度和经度。

第三，如果 GPS 已关闭，我正在尝试从 NETWORK Provider 获取位置。 但是，在这种情况下，有时无法成功获取位置。

所以，我必须让用户打开 GPS，打开 GPS 后必须获取位置。

我很困惑，因为许多演示都提供了打开 GPS 的意图。 如何动态打开 GPS？ 如何在用户打开 GPS 时收到通知？

谢谢。

Answer 1

这是 Gradle 插件，在我的例子中，它是版本：'17.0.0'

implementation "com.google.android.gms:play-services-location:$parent.ext.playServicesVersion"

这是GpsUtils 类，

import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Context;
import android.content.IntentSender;
import android.location.LocationManager;
import android.util.Log;
import android.widget.Toast;

import androidx.annotation.NonNull;

import com.google.android.gms.common.api.ApiException;
import com.google.android.gms.common.api.ResolvableApiException;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.location.LocationServices;
import com.google.android.gms.location.LocationSettingsRequest;
import com.google.android.gms.location.LocationSettingsResponse;
import com.google.android.gms.location.LocationSettingsStatusCodes;
import com.google.android.gms.location.SettingsClient;
import com.google.android.gms.tasks.OnFailureListener;
import com.google.android.gms.tasks.OnSuccessListener;

public class GpsUtils {

    private Context context;
    private SettingsClient mSettingsClient;
    private LocationSettingsRequest mLocationSettingsRequest;
    private LocationManager locationManager;
    private static final String TAG = GpsUtils.class.getSimpleName();

    public GpsUtils(Context context) {

        this.context = context;
        locationManager = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
        mSettingsClient = LocationServices.getSettingsClient(context);

        LocationRequest locationRequest = LocationRequest.create();
        locationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
        locationRequest.setInterval(2 * 1000);
        locationRequest.setFastestInterval(2 * 1000);
        LocationSettingsRequest.Builder builder = new LocationSettingsRequest.Builder()
                .addLocationRequest(locationRequest);
        mLocationSettingsRequest = builder.build();

        //**************************
        builder.setAlwaysShow(true); //this is the key ingredient
        //**************************
    }

    // method for turn on GPS
    public void turnGPSOn(onGpsListener onGpsListener) {

        if (locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)) {
            if (onGpsListener != null) {
                onGpsListener.gpsStatus(true);
            }
        } else {
            mSettingsClient
                    .checkLocationSettings(mLocationSettingsRequest)
                    .addOnSuccessListener((Activity) context, new OnSuccessListener<LocationSettingsResponse>() {
                        @SuppressLint("MissingPermission")
                        @Override
                        public void onSuccess(LocationSettingsResponse locationSettingsResponse) {

                            //  GPS is already enable, callback GPS status through listener
                            if (onGpsListener != null) {
                                onGpsListener.gpsStatus(true);
                            }
                        }
                    })
                    .addOnFailureListener((Activity) context, new OnFailureListener() {
                        @Override
                        public void onFailure(@NonNull Exception e) {
                            int statusCode = ((ApiException) e).getStatusCode();
                            switch (statusCode) {
                                case LocationSettingsStatusCodes.RESOLUTION_REQUIRED:

                                    try {
                                        ResolvableApiException rae = (ResolvableApiException) e;
                                        rae.startResolutionForResult((Activity) context, Appconstants.GPS_REQUEST);
                                    } catch (IntentSender.SendIntentException sie) {
                                        Log.i(TAG, "PendingIntent unable to execute request.");
                                    }
                                    break;
                                case LocationSettingsStatusCodes.SETTINGS_CHANGE_UNAVAILABLE:
                                    String errorMessage = "Location settings are inadequate, and cannot be " +
                                        "fixed here. Fix in Settings.";

                                    Toast.makeText((Activity) context, errorMessage, Toast.LENGTH_LONG).show();
                            }
                        }
                    });
        }
    }

    public interface onGpsListener {
        void gpsStatus(boolean isGPSEnable);
    }
}

您可以从您的活动中调用以下函数来让用户启用 GPS。我将 GPSUtils 类保留在 java 本身中，因为它是可互操作的。

  GpsUtils(this).turnGPSOn { isGPSEnable ->
                isGPS = isGPSEnable  // You can get the callback here..
            }

您可以从here 阅读有关SettingsClient 的更多信息。