如何为 gps 使用特定对话框？答案

【问题标题】：How can I use a specific dialog for gps?如何为 gps 使用特定对话框？
【发布时间】：2021-09-27 23:03:57
【问题描述】：

当我尝试在不进入手机设置的情况下打开 gps 时，我看到了这个对话框：

如何显示带有这样描述的对话框？

这是我的代码示例：

viewModel.onEnableGpsEvent.observe(this, Observer { event ->
    event.getContentIfNotHandled()?.let {
        activity?.let {
            val locationRequest = LocationRequest.create()
            locationRequest.priority = LocationRequest.PRIORITY_HIGH_ACCURACY
            val builder = LocationSettingsRequest.Builder().addLocationRequest(locationRequest)
            val task = LocationServices.getSettingsClient(it).checkLocationSettings(builder.build())

            task.addOnSuccessListener { response ->
                val states = response.locationSettingsStates
                if (states.isLocationPresent) {
                    //TODO: Do something if need it
                }
            }
            task.addOnFailureListener { e ->
                if (e is ResolvableApiException) {
                    try {
                        // Handle result in onActivityResult()
                        e.startResolutionForResult(
                            it,
                            LOCATION_SETTING_REQUEST
                        )
                    } catch (sendEx: IntentSender.SendIntentException) {
                    }
                }
            }
        }

我还有下一个依赖：

implementation 'com.google.android.gms:play-services-location:18.0.0'

【问题讨论】：

标签： android kotlin android-location android-gps

【解决方案1】：

这是我在Fragment中使用的方法：

创建请求 GPS 功能的扩展函数：

 fun Fragment.requestGPSOn(request: ActivityResultLauncher<IntentSenderRequest>) {   //new api
     val locationRequest = LocationRequest.create().apply {
         priority = LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY     //GPS accuracy
     }

     val settingRequest = LocationSettingsRequest.Builder().run {
         addLocationRequest(locationRequest)
         build()
     }

     val settingsClient = LocationServices.getSettingsClient(requireContext())
     val task = settingsClient.checkLocationSettings(settingRequest)         //【fire and receive result】

     task.addOnFailureListener {                             //if GPS is not on currently
         val intentSender = (it as ResolvableApiException).resolution.intentSender
         val intentSenderRequest = IntentSenderRequest.Builder(intentSender).build()

         request.launch(intentSenderRequest)
     }
 }

在Fragment中设置：

 class FirstFragment : Fragment() {
     private lateinit var binding: FragmentFirstBinding
     private lateinit var gpsOnRequest: ActivityResultLauncher<IntentSenderRequest>

     override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View {
         binding = DataBindingUtil.inflate(inflater, R.layout.fragment_first, container, false)
         gpsOnRequest = getGPSOnRequest()

         binding.gpsOnButton.setOnClickListener {
             requestGPSOn(gpsOnRequest)      //extension function, 【will apply specified accuracy even already on!!】
         }

         return binding.root
     }

     private fun getGPSOnRequest() = registerForActivityResult(ActivityResultContracts.StartIntentSenderForResult()) { result ->
         if (result.resultCode != RESULT_OK) {
             //do your stuff
         }
     }
 }

演示：https://youtu.be/nWsSADUmGzM

用于检查 GPS 状态：

fun Fragment.isGPSOn(): Boolean {
    val locationManager = requireContext().getSystemService(Context.LOCATION_SERVICE) as LocationManager

    return locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER)
}

请注意，startActivityForResult() 和 startIntentSenderForResult() 已被弃用，新的 Result api 请查看此官方视频：https://youtu.be/oP-zXjkT0C0。

【讨论】：

结果显示给你什么样的对话框？
@Morozov 你想要的那个，你没有看我的演示视频吗？
您的对话框以中文打开，所以我不确定。感谢您的回复。

【解决方案2】：

用下一个解决方案解决了这个问题：

override fun enableGps(activity: FragmentActivity) {
    if (googleApiClient == null) {
        googleApiClient = GoogleApiClient.Builder(context)
            .addApi(LocationServices.API)
            .addConnectionCallbacks(object : GoogleApiClient.ConnectionCallbacks {
                override fun onConnected(bundle: Bundle?) {}
                override fun onConnectionSuspended(i: Int) {
                    googleApiClient?.connect()
                }
            })
            .addOnConnectionFailedListener { connectionResult ->
                Timber.e("${connectionResult.errorCode}")
            }.build()
        googleApiClient?.connect()
    }
    val locationRequest = LocationRequest.create()
    locationRequest.priority = LocationRequest.PRIORITY_HIGH_ACCURACY
    locationRequest.interval = 10000
    locationRequest.fastestInterval = 5000
    val builder = LocationSettingsRequest.Builder().addLocationRequest(locationRequest)
    builder.setAlwaysShow(true)
    val result: PendingResult<LocationSettingsResult> = LocationServices.SettingsApi.checkLocationSettings(googleApiClient, builder.build())
    result.setResultCallback { result ->
        val status: Status = result.status
        when (status.statusCode) {
            LocationSettingsStatusCodes.RESOLUTION_REQUIRED -> try {
                // Show the dialog by calling startResolutionForResult(),
                status.startResolutionForResult(
                    activity,
                    REQUEST_LOCATION
                )
            } catch (e: IntentSender.SendIntentException) {
                Timber.e(e)
            }
            LocationSettingsStatusCodes.SETTINGS_CHANGE_UNAVAILABLE -> {
                activity.startActivity(Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS))
            }
        }
    }
}

【讨论】：