[英]How do I get the blue location dot to appear in my Android application?
[英]What to I need to fill to get my location? Like the blue dot google has
我是使用Google Maps API的新手,並且已在片段中實現了地圖。 我在地圖上添加了一個標記。 現在,我希望我的位置像谷歌地圖上的藍點一樣彈出。 誰能幫我完成這個任務? 非常感謝。
我的Java文件:
import android.support.v4.app.FragmentActivity;
import android.os.Bundle;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.GoogleMap.OnMyLocationChangeListener;
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;
public class MapsActivity extends FragmentActivity implements OnMapReadyCallback {
private GoogleMap mMap;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_maps);
// 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;
// Add a marker in Sydney and move the camera
LatLng some = new LatLng(80.153, 15.2620);
mMap.addMarker(new MarkerOptions().position(some).title("Marker in some"));
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(some, 18));
}
}
清單文件具有此ACCESS_FINE_LOCATION
您需要啟用“ 我的位置圖層” 。
檢查您的應用是否獲得權限ACCESS_FINE_LOCATION或ACCESS_COARSE_LOCATION
啟用“ 我的位置”圖層 ,使用mMap.setMyLocationEnabled(true);
如果不執行步驟1,則將收到SecurityException。 您應該重寫ActivityCompat.OnRequestPermissionsResultCallback
因此最終代碼應如下所示:
// Check for permission to access Location
private boolean checkLocationPermission() {
Log.d(TAG, "checkPermission()");
// Ask for permission if it wasn't granted yet
return (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)
== PackageManager.PERMISSION_GRANTED);
}
// Asks for permissions
private void askPermission() {
Log.d(TAG, "askPermission()");
ActivityCompat.requestPermissions(
this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION},
PERMISSIONS_REQUEST_ACCESS_FINE_LOCATION
);
}
// Reaction to whether user granted or denied permissions
@Override
public void onRequestPermissionsResult(
int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
Log.d(TAG, "onRequestPermissionsResult()");
super.onRequestPermissionsResult(requestCode, permissions, grantResults);
switch (requestCode) {
case PERMISSIONS_REQUEST_ACCESS_FINE_LOCATION: {
if (grantResults.length > 0
&& grantResults[0] == PackageManager.PERMISSION_GRANTED) {
// Permission granted
if (checkLocationPermission())
mMap.setMyLocationEnabled(true);
} else {
// Permission denied
// TODO
}
break;
}
}
}
並在onMapReady
執行此onMapReady
:
if (checkLocationPermission())
mMap.setMyLocationEnabled(true);
else
askPermission();
這里是參考:
https://developers.google.com/maps/documentation/android-api/location#my-location
https://developers.google.com/maps/documentation/android-api/location#runtime-permission
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