Question

此帖子附有我的MapsActivity。当前，单击右上角的图标（如下图所示），可以读取和更新位置。

如何更改代码以允许应用程序在用户移动时自动更新位置？

例如：当我将新位置推送到设备时，标记将自动移动到新位置。与当前必须连续按下右上角图标以更新位置的状态相反。

谢谢，

import android.Manifest;
import android.content.pm.PackageManager;
import android.graphics.Camera;
import android.location.Address;
import android.location.Geocoder;
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.EditText;
import android.widget.TextView;
import android.widget.Toast;

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.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 java.io.IOException;
import java.util.List;

public class MapsActivity extends FragmentActivity implements OnMapReadyCallback,
        GoogleApiClient.ConnectionCallbacks,
        GoogleApiClient.OnConnectionFailedListener,
        LocationListener {

    private GoogleMap mMap;
    private GoogleApiClient client;
    private LocationRequest locationRequest;
    private Location lastLocation;
    private Marker currentLocationMarker;
    public static final int REQUEST_LOCATION_CODE = 99;
    TextView textView;
    Geocoder geocoder;
    List<Address> addresses;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_maps);

        if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.M){
            checkLocationPermission();
        }

        // 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 onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
       switch(requestCode)
       {
           case REQUEST_LOCATION_CODE:
               if(grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED)
               {
                   //permission is granted
                   if(ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
                       if(client == null){
                           buildGoogleApiClient();
                       }
                       mMap.setMyLocationEnabled(true);
                   }
               }
           else  {
                   Toast.makeText(this, "Permission Denied!", Toast.LENGTH_LONG).show();
                   //Permission is denied
               }
               return;
       }
    }

    @Override
    public void onMapReady(GoogleMap googleMap) {
        Toast.makeText(this, "Click Icon in Top right for Current Location", Toast.LENGTH_LONG).show();
        mMap = googleMap;
        LatLng Phoenix = new LatLng(33.6056711, -112.4052378);
        mMap.addMarker(new MarkerOptions().position(Phoenix).title("Default Location: Phoenix, AZ"));
        mMap.moveCamera(CameraUpdateFactory.newLatLng(Phoenix));


       if(ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
            buildGoogleApiClient();
            mMap.setMyLocationEnabled(true);

        }
    }

        protected synchronized void buildGoogleApiClient(){
             client = new GoogleApiClient.Builder(this)
            .addConnectionCallbacks(this)
            .addOnConnectionFailedListener(this)
            .addApi(LocationServices.API)
            .build();

             client.connect();
        }


    @Override
    public void onLocationChanged(Location location) {
        lastLocation = location;

        if(currentLocationMarker != null){
            currentLocationMarker.remove();
        }

        LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude());
        MarkerOptions markerOptions = new MarkerOptions();
        markerOptions.position(latLng);
        markerOptions.title("Current Location");
        markerOptions.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_AZURE));


        currentLocationMarker = mMap.addMarker((markerOptions));

        mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
        mMap.animateCamera(CameraUpdateFactory.zoomBy(10));

        if(client != null){
            LocationServices.FusedLocationApi.removeLocationUpdates(client, this);
        }

    }

    @Override
    public void onConnected(@Nullable Bundle bundle) {
        locationRequest = new LocationRequest();
        locationRequest.setInterval(1000);
        locationRequest.setFastestInterval(1000);
        locationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);

        if(ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {

            LocationServices.FusedLocationApi.requestLocationUpdates(client, locationRequest, this);
        }
    }

    public boolean checkLocationPermission(){
        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_LOCATION_CODE);
            }
            else {
                ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, REQUEST_LOCATION_CODE);
            }
            return false;
        }
        else
            return true;
    }

    public void onZoom(View view) {
        if (view.getId() == R.id.zoomIn) {
            mMap.animateCamera(CameraUpdateFactory.zoomIn());
        }
        if (view.getId() == R.id.zoomOut) {
            mMap.animateCamera(CameraUpdateFactory.zoomOut());
        }
    }

    public void ChangeType(View view) {
        if (mMap.getMapType() == GoogleMap.MAP_TYPE_NORMAL) {
            mMap.setMapType(GoogleMap.MAP_TYPE_SATELLITE);
            Toast.makeText(this, "Satellite Map Style", Toast.LENGTH_LONG).show();

        }
        else if (mMap.getMapType() == GoogleMap.MAP_TYPE_SATELLITE) {
            mMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
            Toast.makeText(this, "Hybrid Map Style", Toast.LENGTH_LONG).show();
        }
        else if (mMap.getMapType() == GoogleMap.MAP_TYPE_HYBRID) {
            mMap.setMapType(GoogleMap.MAP_TYPE_TERRAIN);
            Toast.makeText(this, "Terrain Map Style", Toast.LENGTH_LONG).show();
        }
        else if (mMap.getMapType() == GoogleMap.MAP_TYPE_TERRAIN) {
            mMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
            Toast.makeText(this, "Normal Map Style", Toast.LENGTH_LONG).show();
        }
        }


    @Override
    public void onConnectionSuspended(int i) {

    }

    @Override
    public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {

    }
}

在MapsActivity中自动更新位置

0 个答案: