我想使用FusedLocationProviderClient持续跟踪在Kotlin开发的android手机上的位置，但是在启动时崩溃了
我已经按照官方文档成功找到了最后一个已知的位置，但是在“更改位置设置”和“接收位置更新”中却失败了。以下是我的代码。我不知道该用什么代替。谢谢。
private const val MY_PERMISSIONS_REQUEST_LOCATION = 1
class MainActivity : AppCompatActivity() {
private lateinit var fusedLocationClient: FusedLocationProviderClient
private var permissions = arrayOf(
Manifest.permission.ACCESS_FINE_LOCATION,
Manifest.permission.ACCESS_COARSE_LOCATION)
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
if (!checkPermission(permissions)) {
// permission request dialog
ActivityCompat.requestPermissions(this,
permissions, MY_PERMISSIONS_REQUEST_LOCATION)
} else {
permissionGrantedView()
}
}
private fun checkPermission(permissions: Array<String>): Boolean {
var anyPermissionGranted = false
for (permission in permissions) {
if (ContextCompat.checkSelfPermission(this, permission)
== PackageManager.PERMISSION_GRANTED)
anyPermissionGranted = true
}
return anyPermissionGranted
}
// Handling user responds to the permission request dialog
override fun onRequestPermissionsResult(requestCode: Int,
permissions: Array<String>, grantResults: IntArray) {
if ((grantResults.isNotEmpty() && grantResults[0] == PackageManager.PERMISSION_GRANTED)) {
// If request is cancelled, the result arrays are empty.
// permission granted
permissionGrantedView()
} else {
// permission denied
permissionDeniedView()
}
}
private fun permissionGrantedView() {
Toast.makeText(this, "Permission granted", Toast.LENGTH_SHORT).show()
btn_get_last_location.setOnClickListener { getLastLocation() }
}
private fun permissionDeniedView() {
Toast.makeText(this, "Permission denied", Toast.LENGTH_SHORT).show()
btn_get_last_location.isEnabled = false
}
private fun getLastLocation() {
fusedLocationClient = LocationServices.getFusedLocationProviderClient(this)
if (checkPermission(permissions)) {
fusedLocationClient.lastLocation.addOnSuccessListener { location: Location? ->
if (location == null) {
Toast.makeText(this, "Location null", Toast.LENGTH_SHORT).show()
} else {
text_last_location.append("${Calendar.getInstance().time}\n")
text_last_location.append("${location.latitude}\n")
text_last_location.append("${location.longitude}\n")
}
}
}
}
fun createLocationRequest() {
val locationRequest = LocationRequest.create()?.apply {
interval = 10000
fastestInterval = 5000
priority = LocationRequest.PRIORITY_HIGH_ACCURACY
}
val builder = LocationSettingsRequest.Builder().addLocationRequest(locationRequest)
val client: SettingsClient = LocationServices.getSettingsClient(this)
val task: Task<LocationSettingsResponse> = client.checkLocationSettings(builder.build())
task.addOnSuccessListener { locationSettingsResponse ->
// All location settings are satisfied. The client can initialize
// location requests here.
// ...
}
task.addOnFailureListener { exception ->
if (exception is ResolvableApiException){
// Location settings are not satisfied, but this can be fixed
// by showing the user a dialog.
try {
// Show the dialog by calling startResolutionForResult(),
// and check the result in onActivityResult().
exception.startResolutionForResult(this@MainActivity,
REQUEST_CHECK_SETTINGS)
} catch (sendEx: IntentSender.SendIntentException) {
// Ignore the error.
}
}
}
}
}
有许多未解决的参考，我也不知道本节的结果。