Java 尝试调用虚拟方法';双android.location.location.getLatitude()';使用mapbox时在空对象引用上
当我使用mapbox时,我遇到了与GPS相关的问题Java 尝试调用虚拟方法';双android.location.location.getLatitude()';使用mapbox时在空对象引用上,java,android-studio-3.0,Java,Android Studio 3.0,当我使用mapbox时,我遇到了与GPS相关的问题 public class MainActivity extends AppCompatActivity implements OnMapReadyCallback,PermissionsListener { FirebaseAuth auth; private MapView mapView; private MapboxMap mapboxMap; private PermissionsManager pe
public class MainActivity extends AppCompatActivity implements OnMapReadyCallback,PermissionsListener {
FirebaseAuth auth;
private MapView mapView;
private MapboxMap mapboxMap;
private PermissionsManager permissionsManager;
Location originLocation;
LocationEngine locationEngine;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Mapbox.getInstance(this, "pk.eyJ1Ijoibml0eWFhcm9yYTcyIiwiYSI6ImNqcHpqeDdjYjAwenU0OG82MDBuZWxtdGIifQ.mMPtHap9shSb-WWzZFyPew");
setContentView(R.layout.activity_main);
mapView = findViewById(R.id.mapView);
mapView.onCreate(savedInstanceState);
/*CameraPosition position = new CameraPosition.Builder()
.target(new LatLng(25.3254275, 83.0088737))
.zoom(14)
.tilt(20)
.build();*/
auth = FirebaseAuth.getInstance();
mapView.getMapAsync(this);
/*@Override
public void onMapReady(MapboxMap mapboxMap) {
mapboxMap.addMarker(new MarkerOptions()
.position(new LatLng(25.3254275,83.0088737))
.title("My Location")
.snippet("bro"));
mapboxMap.animateCamera(CameraUpdateFactory.newCameraPosition(position), 200);*/
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
permissionsManager.onRequestPermissionsResult(requestCode, permissions, grantResults);
}
@Override
@SuppressWarnings({"MissingPermission"})
public void onStart() {
super.onStart();
mapView.onStart();
}
@Override
public void onResume() {
super.onResume();
mapView.onResume();
}
@Override
public void onPause() {
super.onPause();
mapView.onPause();
}
@Override
public void onStop() {
super.onStop();
mapView.onStop();
}
@Override
public void onLowMemory() {
super.onLowMemory();
mapView.onLowMemory();
}
@Override
protected void onDestroy() {
super.onDestroy();
mapView.onDestroy();
}
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
mapView.onSaveInstanceState(outState);
}
@Override
public void onExplanationNeeded(List<String> permissionsToExplain) {
Toast.makeText(this, "Explanation needed", Toast.LENGTH_LONG).show();
}
@Override
public void onPermissionResult(boolean granted) {
if (granted) {
initializeLocationEngine();
enableLocationComponent();
} else {
Toast.makeText(this, "Permission Needed", Toast.LENGTH_LONG).show();
finish();
}
}
@Override
public void onMapReady(MapboxMap mapboxMap) {
MainActivity.this.mapboxMap = mapboxMap;
locationEnable();
}
void locationEnable() {
if (PermissionsManager.areLocationPermissionsGranted(this)) {
initializeLocationEngine();
enableLocationComponent();
} else {
permissionsManager = new PermissionsManager(this);
permissionsManager.requestLocationPermissions(this);
}
}
@SuppressWarnings({"MissingPermission"})
private void enableLocationComponent() {
if (PermissionsManager.areLocationPermissionsGranted(this)) {
Location lastLocation = locationEngine.getLastLocation();
FirebaseUser firebaseUser = auth.getCurrentUser();
String userId = firebaseUser.getUid();
DatabaseReference reference = FirebaseDatabase.getInstance().getReference("Users").child(userId);
reference.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
HashMap user = (HashMap) dataSnapshot.getValue();
Log.i("userid", user.get("userId").toString());
Log.i("username", user.get("username").toString());
reference.child("latLng").addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
Log.i("userblaa", dataSnapshot.toString());
if(lastLocation!=null){
originLocation=lastLocation;
}
Log.i("Location",String.valueOf(lastLocation.getLatitude())+lastLocation.getLongitude());
LatLng latLng = new LatLng(originLocation.getLatitude(), originLocation.getLongitude());
IconFactory iconFactory = IconFactory.getInstance(MainActivity.this);
Bitmap iconDrawable = BitmapFactory.decodeResource(getResources(),R.drawable.marker);
iconDrawable=Bitmap.createScaledBitmap(iconDrawable, 70, 70, true);
com.mapbox.mapboxsdk.annotations.Icon icon=iconFactory.fromBitmap(iconDrawable);
mapboxMap.addMarker(new MarkerOptions()
.position(new LatLng(originLocation.getLatitude(), originLocation.getLongitude()))
.setIcon(icon)
);
mapboxMap.animateCamera(CameraUpdateFactory.newLatLngZoom(
new LatLng(originLocation.getLatitude(), originLocation.getLongitude()), 12));
reference.child("latLng").setValue(latLng);
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
//Log.i("userlatlng",user.getLatLng().getLatitude()+" "+user.getLatLng().getLongitude());
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
public类MainActivity扩展了AppCompatActivity在AppReadyCallback、PermissionsListener上的实现{
FirebaseAuth-auth;
私有地图视图;
私有MapboxMap MapboxMap;
私人许可证管理人许可证管理人;
位置-原始位置;
定位发动机定位发动机;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
getInstance(这是“pk.eyj1ijoibml0ewfhcm9yytcyiwiysi6imnqchpqeddjyjawenu0og82mdbuzwxtdgiifq.mMPtHap9shSb WWzZFyPew”);
setContentView(R.layout.activity_main);
mapView=findViewById(R.id.mapView);
onCreate(savedInstanceState);
/*CameraPosition位置=新建CameraPosition.Builder()
.目标(新LatLng(25.3254275,83.0088737))
.zoom(14)
.倾斜(20)
.build()*/
auth=FirebaseAuth.getInstance();
getMapAsync(这个);
/*@凌驾
mapready上的公共无效(MapboxMap MapboxMap){
addMarker(新的MarkerOptions()
.位置(新车床(25.3254275,83.0088737))
.title(“我的位置”)
.片段(“兄弟”);
mapboxMap.animateCamera(CameraUpdateFactory.newCameraPosition(position),200)*/
}
@凌驾
public void onRequestPermissionsResult(int-requestCode,@NonNull-String[]permissions,@NonNull-int[]grantResults){
super.onRequestPermissionsResult(请求代码、权限、授权结果);
permissionsManager.onRequestPermissionsResult(请求代码、权限、grantResults);
}
@凌驾
@SuppressWarnings({“MissingPermission”})
public void onStart(){
super.onStart();
onStart();
}
@凌驾
恢复时公开作废(){
super.onResume();
onResume();
}
@凌驾
公共无效暂停(){
super.onPause();
onPause();
}
@凌驾
公共void onStop(){
super.onStop();
mapView.onStop();
}
@凌驾
public void onLowMemory(){
super.onLowMemory();
onLowMemory();
}
@凌驾
受保护的空onDestroy(){
super.ondestory();
mapView.onDestroy();
}
@凌驾
SaveInstanceState上受保护的无效(束超出状态){
super.onSaveInstanceState(超出状态);
mapView.onSaveInstanceState(outState);
}
@凌驾
public void OneExplanationRequired(列出许可证解释){
Toast.makeText(这个“需要解释”,Toast.LENGTH_LONG).show();
}
@凌驾
public void onPermissionResult(已授予布尔值){
如果(授予){
初始化ElocationEngine();
enableLocationComponent();
}否则{
Toast.makeText(此“需要许可”,Toast.LENGTH_LONG).show();
完成();
}
}
@凌驾
mapready上的公共无效(MapboxMap MapboxMap){
MainActivity.this.mapboxMap=mapboxMap;
locationEnable();
}
void locationEnable(){
if(许可证管理人areLocationPermissionsGranted(本)){
初始化ElocationEngine();
enableLocationComponent();
}否则{
permissionsManager=新的permissionsManager(此);
permissionsManager.requestLocationPermissions(此);
}
}
@SuppressWarnings({“MissingPermission”})
私有void enableLocationComponent(){
if(许可证管理人areLocationPermissionsGranted(本)){
Location lastLocation=locationEngine.getLastLocation();
FirebaseUser FirebaseUser=auth.getCurrentUser();
字符串userId=firebaseUser.getUid();
DatabaseReference=FirebaseDatabase.getInstance().getReference(“用户”).child(用户ID);
addValueEventListener(新的ValueEventListener(){
@凌驾
public void onDataChange(@NonNull DataSnapshot DataSnapshot){
HashMap用户=(HashMap)dataSnapshot.getValue();
Log.i(“userid”,user.get(“userid”).toString();
Log.i(“用户名”,user.get(“用户名”).toString();
reference.child(“latLng”).addValueEventListener(新的ValueEventListener()){
@凌驾
public void onDataChange(@NonNull DataSnapshot DataSnapshot){
Log.i(“userblaa”,dataSnapshot.toString());
if(lastLocation!=null){
originLocation=最后一个位置;
}
Log.i(“Location”,String.valueOf(lastLocation.getLatitude())+lastLocation.getLength());
LatLng LatLng=新LatLng(originLocation.getLatitude(),originLocation.getLongitude());
IconFactory IconFactory=IconFactory.getInstance(MainActivity.this);
位图iconDrawable=BitmapFactory.decodeResource(getResources(),R.drawable.marker);
iconDrawable=Bitmap.createScaledBramap(iconDrawable,70,70,true);
com.mapbox.mapboxsdk.annotations.Icon-Icon=iconFactory.fromBitmap(iconDrawable);
addMarker(新的MarkerOptions()
.position(新车床(originLocation.getLatitude(),originLocation.getLatitude())
.setIcon(图标)
);
mapboxMap.animateCamera(CameraUpdateFactory.newLatLngZoom(