這個問題在這里已經有了答案： Android LocationListener, AbstractMethodError onStatusChanged 和 onProviderDisabled （6 個回答） 昨天關閉。
我已經從 UDEMY 課程中嘗試過這段代碼。像他一樣寫，他可以訪問位置并獲得 Toast，而我無法打開具有允許位置的應用程式。允許定位時，我的應用程式崩潰。但是當拒絕時，我可以看到地圖并且不再崩潰。
***我的谷歌地圖 API 也運行良好。還采取了用戶互聯網和定位服務。
MapsActivity.java：
package com.project.demo2map;
import androidx.annotation.NonNull;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import androidx.fragment.app.FragmentActivity;
import android.Manifest;
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 android.os.Bundle;
import android.util.Log;
import android.widget.Toast;
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.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;
import com.project.demo2map.databinding.ActivityMapsBinding;
public class MapsActivity extends FragmentActivity implements OnMapReadyCallback {
private GoogleMap mMap;
private ActivityMapsBinding binding;
LocationManager locationManager;
LocationListener locationListener;
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
if (requestCode == 1) {
if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED) {
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER,0,0, locationListener);
}
}
}
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
binding = ActivityMapsBinding.inflate(getLayoutInflater());
setContentView(binding.getRoot());
// Obtain the SupportMapFragment and get notified when the map is ready to be used.
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
.findFragmentById(R.id.map);
mapFragment.getMapAsync(this);
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
locationListener = new LocationListener() {
@Override
public void onLocationChanged(@NonNull Location location) {
Toast.makeText(MapsActivity.this, location.toString(), Toast.LENGTH_SHORT).show();
}
};
if (Build.VERSION.SDK_INT < 23) {
locationManager.requestLocationUpdates(LocationManager.
GPS_PROVIDER, 0, 0, locationListener);
}else {
if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)
!= PackageManager.PERMISSION_GRANTED) {
ActivityCompat.requestPermissions(this,
new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, 1);
} else {
locationManager.requestLocationUpdates(LocationManager.
GPS_PROVIDER, 0, 0, locationListener);
}
}
}
/**
* Manipulates the map once available.
* This callback is triggered when the map is ready to be used.
* This is where we can add markers or lines, add listeners or move the camera. In this case,
* we just add a marker near Sydney, Australia.
* If Google Play services is not installed on the device, the user will be prompted to install
* it inside the SupportMapFragment. This method will only be triggered once the user has
* installed Google Play services and returned to the app.
*/
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
// Add a marker in Sydney and move the camera
LatLng sydney = new LatLng(-34, 151);
mMap.addMarker(new MarkerOptions().position(sydney).title("Marker in Sydney"));
mMap.moveCamera(CameraUpdateFactory.newLatLng(sydney));
}
}
崩潰日志：
2021-10-25 14:59:29.003 25984-25984/com.project.demo2map D/AndroidRuntime: Shutting down VM
2021-10-25 14:59:29.006 25984-25984/com.project.demo2map E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.project.demo2map, PID: 25984
java.lang.AbstractMethodError: abstract method "void android.location.LocationListener.onProviderDisabled(java.lang.String)"
at android.location.LocationManager$ListenerTransport._handleMessage(LocationManager.java:365)
at android.location.LocationManager$ListenerTransport.access$000(LocationManager.java:275)
at android.location.LocationManager$ListenerTransport$1.handleMessage(LocationManager.java:291)
at android.os.Handler.dispatchMessage(Handler.java:107)
at android.os.Looper.loop(Looper.java:214)
at android.app.ActivityThread.main(ActivityThread.java:7356)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:491)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:925)
uj5u.com熱心網友回復：
覆寫 onProviderChanged() 方法將解決此問題。
uj5u.com熱心網友回復：
檢查是否有任何提供程式處于活動狀態。
if( locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER) ||
locationManager .isProviderEnabled(LocationManager.GPS_PROVIDER)){
//start listener to requestUpdates ...
}else{
//show message, no providers enabled.
}
轉載請註明出處，本文鏈接：https://www.uj5u.com/net/337161.html
標籤：爪哇 安卓 谷歌地图 谷歌地图-android-api-2