Android：谷歌地图未显示在我的应用程序中

Posted 2023-05-07

【中文标题】Android：谷歌地图未显示在我的应用程序中

【英文标题】：Android: Google maps not displaying in my app

【发布时间】：2017-11-29 00:11:26

【问题描述】：

我正在学习创建 Uber 克隆的在线课程。但是，我有一个问题。在模拟器中，当单击骑手选项时，我想重定向到一个名为“RiderActivity”的新活动，并且应该显示一张地图。但是，什么也没有发生。

这是我的新活动代码：

public class RiderActivity extends FragmentActivity implements OnMapReadyCallback 

private GoogleMap mMap;

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);
                Location lastKnownLocation = locationManager.getLastKnownLocation(locationManager.GPS_PROVIDER);

                updateMap(lastKnownLocation);
            
        
    


public void updateMap(Location location)
    LatLng userLocation = new LatLng(location.getLatitude(),location.getLongitude());
    mMap.clear();
    mMap.moveCamera(CameraUpdateFactory.newLatLng(userLocation));
    mMap.addMarker(new MarkerOptions().position(userLocation).title("Your Location"));


@Override
protected void onCreate(Bundle savedInstanceState) 
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_rider);
    // 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);



/**
 * 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;

    //setup location manager and listerner
    locationManager = (LocationManager) this.getSystemService(Context.LOCATION_SERVICE) ;

    locationListener = new LocationListener() 
        @Override
        public void onLocationChanged(Location location) 
           updateMap(location);
        

        @Override
        public void onStatusChanged(String s, int i, Bundle bundle) 

        

        @Override
        public void onProviderEnabled(String s) 

        

        @Override
        public void onProviderDisabled(String s) 

        
    ;


    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);
            Location lastKnownLocation = locationManager.getLastKnownLocation(locationManager.GPS_PROVIDER);

            updateMap(lastKnownLocation);
        
    


    // 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));

在 MainActivity 中，我有一个方法

public void redirectActivity()
if(ParseUser.getCurrentUser().get("riderOrDriver") == "rider")
  Intent intent =  new Intent(getApplicationContext(),RiderActivity.class);
   
 

【参考方案1】：

模拟器不支持谷歌地图，直到刚才，您需要下载支持Play商店的新模拟器。 如果您已完成上述操作，您可能需要交叉检查您的 google map api 密钥并检查您是否在开发人员 api 控制台中启用了 maps api。 在应用程序中获取地图是一个非常简单的分步过程，如谷歌地图集成文档中所述。