我可以發(fā)送整個(gè)項(xiàng)目或所需的文件，請(qǐng)幫助我，這是我的程序`package com.parkaspot.najeeb.project;import android.Manifest;import android.content.Context;import android.content.Intent;import android.content.pm.PackageManager;import android.location.Location;import android.location.LocationManager; import android.support.v4.app.ActivityCompat; import android.support.v7.widget.CardView; import android.support.v7.widget.RecyclerView; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.TextView; import com.github.ivbaranov.mli.MaterialLetterIcon; import java.util.ArrayList; import java.util.Random;public class RecentAdapter extends RecyclerView.Adapter<RecentAdapter.ViewHolder>{private Context context;private ArrayList<RecentData> mArrayList;private LayoutInflater inflater;private int[] mMaterialColors;Location networkLocation;Double lati,lngi;private static final Random RANDOM = new Random();public RecentAdapter(Context context, ArrayList<RecentData> list) { this.context = context; this.mArrayList = list; inflater = LayoutInflater.from(context); mMaterialColors = context.getResources().getIntArray(R.array.colors); LocationManager locationManager = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE); boolean networkEnabled = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER); if (networkEnabled) { if (ActivityCompat.checkSelfPermission(context, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(context, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) { return; } networkLocation = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER); } if (networkLocation!=null){ lati = networkLocation.getLatitude(); lngi = networkLocation.getLongitude(); }}兄弟們請(qǐng)幫助我，我已經(jīng)花了3天的時(shí)間來解決此問題，但是我無法對(duì)Android Programmking進(jìn)行新手學(xué)習(xí)，并且正在做一個(gè)大學(xué)項(xiàng)目，請(qǐng)幫助我修復(fù)它
1 回答
一只萌萌小番薯
TA貢獻(xiàn)1795條經(jīng)驗(yàn) 獲得超7個(gè)贊
我為什么會(huì)看到您的gps無法獲得您的位置，并且總是收到null指針，
這是我想獲取地理位置時(shí)使用的類
LocationDetector.kt
class LocationDetector(val context: Context) {
val fusedLocationClient: FusedLocationProviderClient = FusedLocationProviderClient(context)
var locationListener: LocationListener? = null
interface LocationListener {
fun locationFound(location: Location)
fun locationNotFound(reason: String)
}
fun detectLocation() {
//create request
val locationRequest = LocationRequest()
locationRequest.interval = 0L
// check for permission
val permissionResult = ContextCompat.checkSelfPermission(context, android.Manifest.permission.ACCESS_FINE_LOCATION)
// if have permission, try to get location within 10 seconds
if (permissionResult == android.content.pm.PackageManager.PERMISSION_GRANTED) {
val timer = Timer()
val locationCallback = object : LocationCallback() {
override fun onLocationResult(locationResult: LocationResult) {
fusedLocationClient.removeLocationUpdates(this)
timer.cancel()
// return location
locationListener?.locationFound(locationResult.locations.first())
}
}
timer.schedule(timerTask {
fusedLocationClient.removeLocationUpdates(locationCallback)
locationListener?.locationNotFound("Timeout")
}, 10 * 1000) //10 seconds
// make request
fusedLocationClient.requestLocationUpdates(locationRequest, locationCallback, null)
} else {
// if no permission
locationListener?.locationNotFound("No permission given")
}
}
以及你會(huì)怎樣的方式
class MainActivity : AppCompatActivity(), LocationDetector.LocationListener {
var isGPSRunning = false
override fun locationFound(location: Location) {
AppPreferencesSingleton(applicationContext).put(AppPreferencesSingleton.Key.latitude,location.latitude.toString())
AppPreferencesSingleton(applicationContext).put(AppPreferencesSingleton.Key.longitude,location.longitude.toString())
}
override fun locationNotFound(reason: String) {
when(isGPSEnabled()){
true -> {
println("Waiting for GPS fix")
}
false -> {
if (!isGPSRunning) {
isGPSRunning = true
startActivity(Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS))
}
}
}
}
fun isGPSEnabled() = (getSystemService(Context.LOCATION_SERVICE) as LocationManager).isProviderEnabled(LocationManager.GPS_PROVIDER)
這在KOTLIN中，但是修改很簡單，請(qǐng)記住在清單中設(shè)置所需的權(quán)限：
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.INTERNET" />
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