我正在使用 Google Api 服务用 Java 构建 map 。目前，我的 map 接收一个地址，然后在 map 上查找并标记该位置。我希望它能够接收坐标并找到这些坐标的位置并对其进行标记，但还没有找到显示如何执行此操作的文档。有人能指出我正确的方向吗？谢谢:)
这是我的 map 的图像，用于提供某种可视化效果 ! /image/Wv3Y5.jpg
我需要它从搜索栏中获取纬度/经度并在 map 上定位/标记区域。这是迄今为止我的 map 应用程序的代码
package net.androidbootcamp.mymapdemo;
import android.Manifest;
import android.content.pm.PackageManager;
import android.location.Address;
import android.location.Geocoder;
import android.location.Location;
import android.location.LocationProvider;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.KeyEvent;
import android.view.View;
import android.view.WindowManager;
import android.view.inputmethod.EditorInfo;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import com.google.android.gms.location.FusedLocationProviderClient;
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.LatLng;
import com.google.android.gms.maps.model.Marker;
import com.google.android.gms.maps.model.MarkerOptions;
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;
/**
* Created by Micha on 3/1/2018.
*/
public class MapActivity extends AppCompatActivity implements OnMapReadyCallback {
@Override
public void onMapReady(GoogleMap googleMap) {
Toast.makeText(this, "Map is Ready", Toast.LENGTH_SHORT).show();
Log.d(TAG, "onMapReady: Map is Ready");
mMap = googleMap;
if (mLocationPermissionsGranted) {
getDeviceLocation();
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)
!= PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this,
Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
return;
}
mMap.setMyLocationEnabled(true);
mMap.getUiSettings().setMyLocationButtonEnabled(false);
init();
}
}
private static final String TAG = "MapActivity";
private static final String FINE_LOCATION = Manifest.permission.ACCESS_FINE_LOCATION;
private static final String COURSE_LOCATION = Manifest.permission.ACCESS_COARSE_LOCATION;
private static final int LOCATION_PERMISSION_REQUEST_CODE = 1234;
private static final float DEFAULT_ZOOM = 15f;
//Widget
private EditText mSearchText;
private ImageView mGps;
//Variables
private Boolean mLocationPermissionsGranted = false;
private GoogleMap mMap;
private FusedLocationProviderClient mFusedLocationProviderClient;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_map);
getLocationPermission();
mSearchText =(EditText) findViewById(R.id.input_search);
mGps = (ImageView) findViewById(R.id.ic_gps);
}
private void init(){
Log.d(TAG, "init: initializing");
mSearchText.setOnEditorActionListener(new TextView.OnEditorActionListener() {
@Override
public boolean onEditorAction(TextView textViewv, int actionId, KeyEvent keyEvent) {
if (actionId == EditorInfo.IME_ACTION_SEARCH
|| actionId == EditorInfo.IME_ACTION_DONE
|| keyEvent.getAction() == KeyEvent.ACTION_DOWN
|| keyEvent.getAction() == KeyEvent.KEYCODE_ENTER){
//Execute method for searching
geoLocate();
}
return false;
}
});
mGps.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Log.d(TAG,"onClick: clicked gps icon");
getDeviceLocation();
}
});
hideSoftKeyboard();
}
private void geoLocate(){
Log.d(TAG,"geoLocate: geolocating");
String searchString = mSearchText.getText().toString();
Geocoder geocoder = new Geocoder(MapActivity.this);
List<Address> list = new ArrayList<>();
try {
list = geocoder.getFromLocationName(searchString, 1);
}catch (IOException e){
Log.e(TAG,"geoLocate: IOException:" + e.getMessage());
}
if (list.size() > 0){
Address address = list.get(0);
Log.d(TAG,"geoLocate: found a location: " + address.toString());
//Toast.makeText(this, address.toString(), Toast.LENGTH_SHORT).show();
moveCamera(new LatLng(address.getLatitude(),address.getLongitude()),DEFAULT_ZOOM, address.getAddressLine(0));
}
}
private void getDeviceLocation(){
Log.d(TAG,"getDeviceLocation: getting the devices current location");
mFusedLocationProviderClient = LocationServices.getFusedLocationProviderClient(this);
try {
if (mLocationPermissionsGranted){
Task location = mFusedLocationProviderClient.getLastLocation();
location.addOnCompleteListener(new OnCompleteListener() {
@Override
public void onComplete(@NonNull Task task) {
if (task.isSuccessful()){
Log.d(TAG,"onComplete: found location!");
Location currentLocation = (Location) task.getResult();
moveCamera(new LatLng(currentLocation.getLatitude(), currentLocation.getLongitude()), DEFAULT_ZOOM,"My Location");
}else {
Log.d(TAG,"onComplete: current location is null");
Toast.makeText(MapActivity.this, "unable to get current location", Toast.LENGTH_SHORT).show();
}
}
});
}
}catch (SecurityException e){
Log.e(TAG,"getDeviceLocation: SecurityException: " + e.getMessage());
}
}
private void moveCamera(LatLng latLng, float zoom, String title){
Log.d(TAG, "moveCamera: moving the camera to: lat: " + latLng.latitude + ", lng: " + latLng.longitude);
mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(latLng,zoom));
if (!title.equals("My Location")){
MarkerOptions options = new MarkerOptions()
.position(latLng)
.title(title)
.draggable(true);
mMap.addMarker(options);
}
hideSoftKeyboard();
}
private void initMap(){
Log.d(TAG,"initMap: initializing map");
SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map);
mapFragment.getMapAsync(MapActivity.this);
}
//Checks permissions
private void getLocationPermission(){
Log.d(TAG,"getLocationPermission: getting location permissions");
String[] permissions = {Manifest.permission.ACCESS_FINE_LOCATION,
Manifest.permission.ACCESS_COARSE_LOCATION};
if (ContextCompat.checkSelfPermission(this.getApplicationContext(),
FINE_LOCATION) == PackageManager.PERMISSION_GRANTED){
if (ContextCompat.checkSelfPermission(this.getApplicationContext(),
COURSE_LOCATION) == PackageManager.PERMISSION_GRANTED){
mLocationPermissionsGranted = true;
initMap();
} else {
ActivityCompat.requestPermissions(this,
permissions,
LOCATION_PERMISSION_REQUEST_CODE);
}
}else {
ActivityCompat.requestPermissions(this,
permissions,
LOCATION_PERMISSION_REQUEST_CODE);
}
}
@Override
public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
Log.d(TAG,"onRequestPermissionsResult: called.");
mLocationPermissionsGranted = false;
switch (requestCode){
case LOCATION_PERMISSION_REQUEST_CODE:{
if(grantResults.length > 0){
for (int i = 0; i < grantResults.length; i++){
if (grantResults[i] != PackageManager.PERMISSION_GRANTED){
mLocationPermissionsGranted = false;
Log.d(TAG,"onRequestPermissionsResult: permission failed");
return;
}
}
Log.d(TAG,"onRequestPermissionsResult: permission granted");
mLocationPermissionsGranted = true;
//Initialize map
initMap();
}
}
}
}
private void hideSoftKeyboard(){
this.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);
}
}
最佳答案
在搜索坐标时您使用了错误的方法。
使用它作为坐标:
getFromLocation(double latitude, double longitude, int maxResults)
当您有地址时我们会这样做:
getFromLocationName(String locationName, int maxResults)
请注意一件事，上述方法可以返回多个地址，并且您正在使用返回列表中的第一个地址。
Address address = list.get(0);
显然，您无法确定索引 0 处的地址就是所需的地址，甚至设置 maxResults=1 也不能保证您将获得所需的地址。因此，您有两个选择，要么在 map 上显示所有返回地址，要么定义要显示的地址类型的标准，即餐厅、医院等......
关于java - 如何使用坐标在 map android上查找位置，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/49144922/