Android Kotlin 谷歌地图变成黑屏

Question

所以我根据我所学的课程为安卓创建了一个简单的应用程序。 在我创建一个类和函数来检测gps上的位置更改之前，地图显示得很好，现在每当活动打开并授予它权限时，它只会在我的手机上显示黑屏，没有错误崩溃或任何事情，但除了关闭应用程序之外无法做任何事情（我使用真实设备进行模拟）。 我已经在 xml 上添加了 api 密钥

这是我的代码

import android.content.Context
import android.content.pm.PackageManager
import android.location.Location
import android.location.LocationListener
import android.location.LocationManager
import android.os.Build
import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.widget.Toast
import androidx.core.app.ActivityCompat

import com.google.android.gms.maps.CameraUpdateFactory
import com.google.android.gms.maps.GoogleMap
import com.google.android.gms.maps.OnMapReadyCallback
import com.google.android.gms.maps.SupportMapFragment
import com.google.android.gms.maps.model.BitmapDescriptorFactory
import com.google.android.gms.maps.model.LatLng
import com.google.android.gms.maps.model.MarkerOptions

class MapsActivity : AppCompatActivity(), OnMapReadyCallback {

    private lateinit var mMap: GoogleMap
    var accessLocation = 123
    var location : Location? = null
    var name : String = "We"

    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.
        name = intent.getStringExtra("name")
        val mapFragment = supportFragmentManager
            .findFragmentById(R.id.map) as SupportMapFragment
        mapFragment.getMapAsync(this)

        getPermission()
    }

    fun getPermission(){
        if(Build.VERSION.SDK_INT >= 23){
            if(ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION)!= PackageManager.PERMISSION_GRANTED){
                requestPermissions(arrayOf(android.Manifest.permission.ACCESS_FINE_LOCATION),accessLocation)
                return
            }
        }

        getLocation()


    }

    fun getLocation(){
        Toast.makeText(this, "Location access permision granted", Toast.LENGTH_LONG).show()

        var myLocationListener = MapListener()
        var locationManager = getSystemService(Context.LOCATION_SERVICE) as LocationManager

        locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,3,3f,myLocationListener)

        var locationTrack = locationThread()
        locationTrack.start()


    }

    override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<out String>, grantResults: IntArray) {

        when(requestCode){
            accessLocation -> {
                if(grantResults[0]==PackageManager.PERMISSION_GRANTED) getLocation()
                else Toast.makeText(this,"Location access is Needed",Toast.LENGTH_LONG).show()
            }
        }

        super.onRequestPermissionsResult(requestCode, permissions, grantResults)
    }

    inner class MapListener : LocationListener {

        constructor(){
            location = Location("Start")
            location!!.latitude = 0.0
            location!!.longitude = 0.0
        }

        override fun onLocationChanged(position: Location?) {

            location = position
        }

        override fun onStatusChanged(provider: String?, status: Int, extras: Bundle?) {
//            TODO("not implemented")

        }

        override fun onProviderEnabled(provider: String?) {
//            TODO("not implemented")
        }

        override fun onProviderDisabled(provider: String?) {
//            TODO("not implemented")
        }


    }

    inner class locationThread : Thread {

        constructor() : super()

        override fun run() {


            while (true){
                try {
                    runOnUiThread{
                    mMap.clear()
                    val located= LatLng(location!!.latitude, location!!.longitude)
                    mMap.addMarker(MarkerOptions()
                        .position(malang)
                        .title("$name are Here")
                        .snippet("have a nice day")
                        .icon(BitmapDescriptorFactory.fromResource(R.drawable.mario)))
                    mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(located,14f))
                    Thread.sleep(1000)
                    }

                }catch (ex : Exception){

                }
            }

        }


    }


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


    }
}

这是清单文件

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
          package="com.furis.sid.pokemon">

    <!--
         The ACCESS_COARSE/FINE_LOCATION permissions are not required to use
         Google Maps Android API v2, but you must specify either coarse or fine
         location permissions for the 'MyLocation' functionality. 
    -->
    <uses-permission android:name="android.permission.INTERNET"/>
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>

    <application
            android:allowBackup="true"
            android:icon="@mipmap/ic_launcher"
            android:label="@string/app_name"
            android:roundIcon="@mipmap/ic_launcher_round"
            android:supportsRtl="true"
            android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN"/>

                <category android:name="android.intent.category.LAUNCHER"/>
            </intent-filter>
        </activity>
        <!--
             The API key for Google Maps-based APIs is defined as a string resource.
             (See the file "res/values/google_maps_api.xml").
             Note that the API key is linked to the encryption key used to sign the APK.
             You need a different API key for each encryption key, including the release key that is used to
             sign the APK for publishing.
             You can define the keys for the debug and release targets in src/debug/ and src/release/. 
        -->
        <meta-data
                android:name="com.google.android.geo.API_KEY"
                android:value="@string/google_maps_key"/>

        <activity
                android:name=".MapsActivity"
                android:label="Map">
        </activity>
    </application>

</manifest>

这就是当应用程序变黑时出现在 logcat 中的内容（真的不知道在这里显示哪个，所以我只是截屏了当它变黑时弹出的内容） logCat

提前致谢

Answer 1

我发现它是黑屏的原因是因为类 locationThread 导致活动中的 onCreate 无法完成，所以我添加了一个变量来存储旧位置并更改了线程类，以便它不会总是调用该函数 位置未更改为此的每一秒：

inner class locationThread : Thread {

    constructor() : super(){

        oldLocation = Location("Start")
        oldLocation!!.latitude = 0.0
        oldLocation!!.longitude = 0.0

    }


    override fun run() {


        while (true){
            try {

                if(location!!.distanceTo(oldLocation)==0f) continue
                oldLocation = location

                runOnUiThread{
                mMap.clear()
                val located= LatLng(location!!.latitude, location!!.longitude)
                mMap.addMarker(MarkerOptions()
                    .position(malang)
                    .title("$namae are Here")
                    .snippet("Have a nice day")
                    .icon(BitmapDescriptorFactory.fromResource(R.drawable.mario)))
                mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(located,14f))
                Thread.sleep(1000)
                }

            }catch (ex : Exception){
            }
        }
    }
}