Question

伙计们，我正在尝试获取用户位置，但是出了点问题，当我运行我的应用程序时，没有播放器图标，并且位置有误-它仍然显示lat = 0.0，lon = 0.0。我不使用模拟器，而是在手机上测试应用（Android 4.4.2如此重要）。请看一下我的代码，也许我只是看不到一个错误。先感谢您！

void Timer::checkTimer() {

    auto now = std::chrono::system_clock::now().time_since_epoch();
    auto milisecondsDuration = std::chrono::milliseconds(duration);
    auto futureDuration = now + milisecondsDuration;

    while (std::chrono::system_clock::now().time_since_epoch() < futureDuration)
    {
        if(endTimer)
        {
            std::terminate();
        }
        std::this_thread::sleep_for (std::chrono::milliseconds(1));
        cout << "Running\n";
    }
    completedListener.timerCompleted(entityId, cause);
}

}

`

Answer 1

尝试这种方式

实现这些依赖的实现

implementation 'com.google.android.gms:play-services:11.4.0'
implementation 'com.google.android.gms:play-services-maps:11.4.0'

在您的AndroidManifest.xml

中使用权限

<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />

创建一个locationListener界面

interface locationListener {
    fun locationResponse(locationResult: LocationResult)
}

然后创建一个Location.kt类

class Location (var activity: AppCompatActivity, locationListener: locationListener){
    private val permissionFineLocation=android.Manifest.permission.ACCESS_FINE_LOCATION
    private val permissionCoarseLocation=android.Manifest.permission.ACCESS_COARSE_LOCATION

    private val REQUEST_CODE_LOCATION=100

    private var fusedLocationClient: FusedLocationProviderClient?=null

    private var locationRequest: LocationRequest?=null
    private var callbabck: LocationCallback?=null
    init {
        fusedLocationClient= FusedLocationProviderClient(activity.applicationContext)

        inicializeLocationRequest()
        callbabck=object: LocationCallback(){
            override fun onLocationResult(p0: LocationResult?) {
                super.onLocationResult(p0)

                locationListener.locationResponse(p0!!)
            }
        }
    }

    private fun inicializeLocationRequest() {
        locationRequest= LocationRequest()
        locationRequest?.interval=50000
        locationRequest?.fastestInterval=5000
        locationRequest?.priority=LocationRequest.PRIORITY_HIGH_ACCURACY
    }
    private fun validatePermissionsLocation():Boolean{
        val fineLocationAvailable= ActivityCompat.checkSelfPermission(activity.applicationContext, permissionFineLocation)== PackageManager.PERMISSION_GRANTED
        val coarseLocationAvailable=ActivityCompat.checkSelfPermission(activity.applicationContext, permissionCoarseLocation)==PackageManager.PERMISSION_GRANTED

        return fineLocationAvailable && coarseLocationAvailable
    }
    private fun requestPermissions(){
        val contextProvider=ActivityCompat.shouldShowRequestPermissionRationale(activity, permissionFineLocation)

        if(contextProvider){
            Toast.makeText(activity.applicationContext, "Permission is required to obtain location", Toast.LENGTH_SHORT).show()
        }
        permissionRequest()
    }
    private fun permissionRequest(){
        ActivityCompat.requestPermissions(activity, arrayOf(permissionFineLocation, permissionCoarseLocation), REQUEST_CODE_LOCATION)
    }
    fun onRequestPermissionsResult(requestCode:Int, permissions:Array<out String>, grantResults:IntArray){
        when(requestCode){
            REQUEST_CODE_LOCATION->{
                if(grantResults.size>0 && grantResults[0]==PackageManager.PERMISSION_GRANTED){
                    getLocation()
                }else{
                    Toast.makeText(activity.applicationContext, "You did not give permissions to get location", Toast.LENGTH_SHORT).show()
                }
            }
        }
    }
    fun stopUpdateLocation(){
        this.fusedLocationClient?.removeLocationUpdates(callbabck)
    }
    fun inicializeLocation(){
        if (validatePermissionsLocation()){
            getLocation()
        }else{
            requestPermissions()
        }
    }
    @SuppressLint("MissingPermission")
    private fun getLocation() {
        validatePermissionsLocation()
        fusedLocationClient?.requestLocationUpdates(locationRequest, callbabck, null)
    }
}

用法

class MapsActivity : AppCompatActivity(), OnMapReadyCallback {
    var location: Location?=null
    private var mMap: GoogleMap? = null

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_maps)
        // Obtain the SupportMapFragment and get notified when the map is ready to be used.
        val mapFragment = supportFragmentManager
            .findFragmentById(R.id.map) as SupportMapFragment
        mapFragment.getMapAsync(this)
        location= Location(this, object :locationListener{
            override fun locationResponse(locationResult: LocationResult) {
                mMap?.clear()
                val sydney = LatLng(locationResult.lastLocation.latitude, locationResult.lastLocation.longitude)
                mMap?.addMarker(MarkerOptions().position(sydney).title("Hi").snippet("Let's go!"))
                mMap?.moveCamera(CameraUpdateFactory.newLatLngZoom(sydney, 14f))
            }
        })

    }

    override fun onMapReady(googleMap: GoogleMap) {
        mMap = googleMap
    }

    override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<out String>, grantResults: IntArray) {
        location?.onRequestPermissionsResult(requestCode, permissions, grantResults)
    }
    override fun onStart() {
        super.onStart()
        location?.inicializeLocation()
    }
    override fun onPause() {
        super.onPause()
        location?.stopUpdateLocation()
    }
}

希望对您有帮助

获取用户的当前位置-Kotlin

1 个答案: