我遇到这样的问题，即我无法从当前位置标记点移动来查看地图的其余部分。
例如，假设我在硅谷。我也可以看到标记。到目前为止，一切看起来都很完美。但是当我尝试导航（上，下，左，右）地图时，它又使我回到了当前位置。
这是自动强行，将我带回当前位置不允许我看到周围的其他地方
这是我的MapActivity代码。
package com.example.jananathbanuka.sliitshuttle;
import android.Manifest;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.location.Location;
import android.os.Build;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.ActivityCompat;
import android.support.v4.app.FragmentActivity;
import android.os.Bundle;
import android.support.v4.content.ContextCompat;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
import com.firebase.geofire.GeoFire;
import com.firebase.geofire.GeoLocation;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.location.LocationListener;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.location.LocationServices;
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.BitmapDescriptor;
import com.google.android.gms.maps.model.BitmapDescriptorFactory;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.Marker;
import com.google.android.gms.maps.model.MarkerOptions;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
public class DriversMap extends FragmentActivity implements
OnMapReadyCallback,
GoogleApiClient.ConnectionCallbacks,
GoogleApiClient.OnConnectionFailedListener,
LocationListener {
private GoogleMap mMap;
GoogleApiClient googleApiClient;
Location lastLocation;
LocationRequest locationRequest;
Marker currentUserLocationMarker;
private static final int REQUEST_USER_LOCATION_CODE = 99;
private Button back;
private FirebaseAuth mAuth;
private FirebaseUser currentUser;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
mAuth = FirebaseAuth.getInstance();
currentUser = mAuth.getCurrentUser();
back = (Button)findViewById(R.id.back);
if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.M){
checkUserLocationPermission();
}
back.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent intent = new Intent(getApplicationContext(), StudentProfile.class);
startActivity(intent);
finish();
}
});
// 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);
}
@Override
public void onMapReady(GoogleMap googleMap) {
mMap = googleMap;
if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
buildGoogleApiClient();
mMap.setMyLocationEnabled(true);
}
}
public boolean checkUserLocationPermission(){
if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
if(ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.ACCESS_FINE_LOCATION)){
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, REQUEST_USER_LOCATION_CODE);
}else{
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, REQUEST_USER_LOCATION_CODE);
}
return false;
}else {
return true;
}
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
switch (requestCode){
case REQUEST_USER_LOCATION_CODE:
if(grantResults.length >0 && grantResults[0] == PackageManager.PERMISSION_GRANTED){
if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
if(googleApiClient == null){
buildGoogleApiClient();
}
mMap.setMyLocationEnabled(true);
}
}else{ //permission denied
Toast.makeText(this, "Permission Denied", Toast.LENGTH_SHORT).show();
}
return;
}
}
@Override
public void onConnected(@Nullable Bundle bundle) {
locationRequest = new LocationRequest();
locationRequest.setInterval(1000);
locationRequest.setFastestInterval(1000);
locationRequest.setPriority(locationRequest.PRIORITY_HIGH_ACCURACY);
if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
LocationServices.FusedLocationApi.requestLocationUpdates(googleApiClient, locationRequest, this);
}
}
@Override
public void onConnectionSuspended(int i) {
}
@Override
public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
}
@Override
public void onPointerCaptureChanged(boolean hasCapture) {
}
@Override
public void onLocationChanged(Location location) {
lastLocation = location;
if(currentUserLocationMarker != null){ //set to some other location
currentUserLocationMarker.remove();
}
LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude());
MarkerOptions markerOptions = new MarkerOptions();
markerOptions.position(latLng);
markerOptions.title("Shutter is Here");
markerOptions.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_ORANGE));
currentUserLocationMarker = mMap.addMarker(markerOptions);
float zoomLevel = 16.0f;
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(latLng, zoomLevel));
// mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
// mMap.animateCamera(CameraUpdateFactory.zoomTo(15));
String driverID = FirebaseAuth.getInstance().getCurrentUser().getUid();
DatabaseReference driverDatBaseReference = FirebaseDatabase.getInstance()
.getReference().child("On the Move");
GeoFire geoFire = new GeoFire(driverDatBaseReference);
geoFire.setLocation(driverID, new GeoLocation(location.getLatitude(), location.getLongitude()), new GeoFire.CompletionListener() {
@Override
public void onComplete(String key, DatabaseError error) {
System.out.println("================ UPDATED!!!");
}
});
}
protected synchronized void buildGoogleApiClient() {
googleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
googleApiClient.connect();
}
@Override
protected void onStop() {
super.onStop();
disconnectDriver();
}
private void disconnectDriver() {
String driverID = FirebaseAuth.getInstance().getCurrentUser().getUid();
DatabaseReference driverDatBaseReference = FirebaseDatabase.getInstance()
.getReference().child("On the Move");
GeoFire geoFire = new GeoFire(driverDatBaseReference);
geoFire.removeLocation(driverID);
}
}
有人可以通过查看我的代码来告诉我，为什么会这样？
答案 0 :(得分：1)
通过添加行locationRequest.setInterval(1000);，您要求每1秒更新一次用户位置。
这将导致您的onLocationChanged(Location location)方法-您调用mMap.moveCamera的方法被每秒调用一次。