Question

应用程序在getlastknown位置崩溃我不知道为什么它在那里崩溃我还在主要节目中包含了所有必需的权限它崩溃了

位置location = locationManager.getLastKnownLocation（LocationManager.NETWORK_PROVIDER）;

public class AddressSelect extends FragmentActivity implements OnMapReadyCallback {

private GoogleMap mMap;
LocationManager locationManager;
myloclis loc;
String addressdelv="";
static ArrayList<Integer> prices;
static ArrayList<String> quantities;
static ArrayList<String> namesorder;
Button submitorder;
Marker marker;

@RequiresApi(api = Build.VERSION_CODES.M)
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_address_select);
    prices=getIntent().getIntegerArrayListExtra("Prices");
    quantities=getIntent().getStringArrayListExtra("quantityneeded");
    namesorder=getIntent().getStringArrayListExtra("Productsnames");
    submitorder=(Button)findViewById(R.id.submitorder);
    submitorder.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if(addressdelv.equals("")){
                Toast.makeText(getApplicationContext(),"Please select a valid location",Toast.LENGTH_LONG).show();

            }else{
                Intent i = new Intent(AddressSelect.this,OrderSummary.class).putExtra("Productsnames",namesorder).putExtra("quantityneeded",quantities).putExtra("Prices",prices).putExtra("addressdelv",addressdelv);
                startActivity(i);
            }
        }
    });
    SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
            .findFragmentById(R.id.map);
    mapFragment.getMapAsync(this);

}
@Override
public void onMapReady(GoogleMap googleMap) {
    mMap = googleMap;


    // Add a marker in Sydney and move the camera
    LatLng cairo = new LatLng(30.0444, 31.2357);
   // mMap.addMarker(new MarkerOptions().position(cairo).title("Marker in Cairo"));
    mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(cairo,10));
    getlocation();
    mMap.setOnMapClickListener(new GoogleMap.OnMapClickListener() {


        @Override
        public void onMapClick(LatLng latLng) {
            if (marker != null) {
                marker.remove();
            }

            marker = mMap.addMarker(new MarkerOptions()
                    .position(latLng)
                    .icon(BitmapDescriptorFactory
                            .defaultMarker(BitmapDescriptorFactory.HUE_RED)));

            Geocoder coder = new Geocoder(getApplicationContext(), Locale.getDefault());
            List<Address> addressList;
            try{
                addressList=coder.getFromLocation(latLng.latitude,latLng.longitude,1);
                if(!addressList.isEmpty()){
                    addressdelv=addressList.get(0).getAddressLine(0);
                    Toast.makeText(getApplicationContext(),addressdelv,Toast.LENGTH_LONG).show();
                    mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(latLng,15));
                }else{
                    Toast.makeText( getApplicationContext(),"We don't deliver to this location sorry",Toast.LENGTH_LONG).show();

                }
            }catch (Exception e){
                Toast.makeText( getApplicationContext(),"Cant get your address check network",Toast.LENGTH_LONG).show();
            }
        }
    });

}


public void getlocation(){
    if(ActivityCompat.checkSelfPermission(this,Manifest.permission.ACCESS_COARSE_LOCATION)!=PackageManager.PERMISSION_GRANTED&&ActivityCompat.checkSelfPermission(this,Manifest.permission.ACCESS_FINE_LOCATION)!=PackageManager.PERMISSION_GRANTED&&ActivityCompat.checkSelfPermission(this,Manifest.permission.INTERNET)!=PackageManager.PERMISSION_GRANTED){
        ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, 1);
    }else{
        Location location = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);

        if (location != null) {
            LatLng latLng = new LatLng(location.getLatitude(),location.getLongitude());
            if (marker != null) {
                marker.remove();
            }

            marker = mMap.addMarker(new MarkerOptions()
                    .position(latLng)
                    .icon(BitmapDescriptorFactory
                            .defaultMarker(BitmapDescriptorFactory.HUE_RED)));

            Geocoder coder = new Geocoder(getApplicationContext(), Locale.getDefault());
            List<Address> addressList;
            try{
                addressList=coder.getFromLocation(latLng.latitude,latLng.longitude,1);
                if(!addressList.isEmpty()){
                    addressdelv=addressList.get(0).getAddressLine(0);
                    Toast.makeText(getApplicationContext(),addressdelv,Toast.LENGTH_LONG).show();
                    mMap.animateCamera(CameraUpdateFactory.newLatLngZoom(latLng,15));
                }else{
                    Toast.makeText( getApplicationContext(),"We don't deliver to this location sorry",Toast.LENGTH_LONG).show();

                }
            }catch (Exception e){
                Toast.makeText( getApplicationContext(),"Cant get your address check network",Toast.LENGTH_LONG).show();
            }
        }else{
           Toast.makeText(getApplicationContext(),"Can't get location sorry",Toast.LENGTH_LONG).show();
        }
    }

}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
    super.onRequestPermissionsResult(requestCode, permissions, grantResults);

    switch (requestCode) {
        case 1:
            getlocation();
            break;
    }
}

}

Answer 1

看起来你永远不会初始化locationManager，所以我猜你在尝试使用它时会得到一个NullPointerException。你应该添加

locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);

或者，请参阅：Getting the Last Known Location

我的应用程序崩溃与gps奇怪的getloation功能

1 个答案: