Android Studio從Google Maps API中獲取位置

Question

我正在製作一個Android應用程序，我要求用戶在Google地圖上移動標記以獲取他們想與我分享的地點的位置。我如何獲得它在地圖上放置的標記的緯度和經度？

Answer 1

您可以使用此代碼來獲取中心的緯度&長，然後用它你喜歡

@Override 
public void onMapReady(GoogleMap googleMap) { 
     mMap = googleMap; 
     googleMap.setOnCameraMoveListener(new GoogleMap.OnCameraMoveListener() { 
       @Override 
       public void onCameraMove() { 
     System.out.println(mMap.getCameraPosition().target.latitude); 
     System.out.println(mMap.getCameraPosition().target.longitude); 
     } 
     }); 
    } 

Answer 2

我在我的Android應用程序類似的實現方式，用戶可以拖動標記到不同的位置和獲取緯度，經度，地址等位置的詳細信息。

MapActivity

import android.Manifest; 
import android.app.AlertDialog; 
import android.content.Context; 
import android.content.DialogInterface; 
import android.content.Intent; 
import android.content.pm.PackageManager; 
import android.location.Location; 
import android.os.Handler; 
import android.os.ResultReceiver; 
import android.provider.Settings; 
import android.support.v4.app.ActivityCompat; 
import android.os.Bundle; 

import android.support.v7.app.AppCompatActivity; 
import android.support.v7.widget.Toolbar; 
import android.util.Log; 
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.GoogleApiAvailability; 
import com.google.android.gms.common.GooglePlayServicesNotAvailableException; 
import com.google.android.gms.common.GooglePlayServicesRepairableException; 
import com.google.android.gms.common.GooglePlayServicesUtil; 
import com.google.android.gms.common.api.GoogleApiClient; 
import com.google.android.gms.common.api.Status; 
import com.google.android.gms.location.LocationRequest; 
import com.google.android.gms.location.LocationServices; 
import com.google.android.gms.location.places.Place; 
import com.google.android.gms.location.places.ui.PlaceAutocomplete; 
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.CameraPosition; 
import com.google.android.gms.maps.model.LatLng; 

public class TestDragMarker extends AppCompatActivity implements OnMapReadyCallback, GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener, com.google.android.gms.location.LocationListener { 
    private GoogleMap mMap; 
    private GoogleApiClient mGoogleApiClient; 
    private final static int PLAY_SERVICES_RESOLUTION_REQUEST = 9000; 
    private static String TAG = "MAP LOCATION"; 
    Context mContext; 
    TextView mLocationMarkerText; 
    private LatLng mCenterLatLong; 

    private AddressResultReceiver mResultReceiver; 

    protected String mAddressOutput; 
    protected String mAreaOutput; 
    protected String mCityOutput; 
    protected String mStateOutput; 
    EditText mLocationAddress; 
    TextView mLocationText; 
    private static final int REQUEST_CODE_AUTOCOMPLETE = 1; 
    Toolbar mToolbar; 


    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_test_drag_marker); 
     mContext = this; 
     // Obtain the SupportMapFragment and get notified when the map is ready to be used. 
     SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager() 
       .findFragmentById(R.id.map); 

     mLocationMarkerText = (TextView) findViewById(R.id.locationMarkertext); 
     mLocationAddress = (EditText) findViewById(R.id.Address); 
     // mLocationText = (TextView) findViewById(R.id.Locality); 
     mToolbar = (Toolbar) findViewById(R.id.toolbar); 
     // setSupportActionBar(mToolbar); 
    // getSupportActionBar().setDisplayShowHomeEnabled(true); 

     // getSupportActionBar().setTitle(getResources().getString(R.string.app_name)); 


     /* mLocationText.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View view) { 

       openAutocompleteActivity(); 

      } 


     }); */ 
     mapFragment.getMapAsync(this); 
     mResultReceiver = new AddressResultReceiver(new Handler()); 

     if (checkPlayServices()) { 
      // If this check succeeds, proceed with normal processing. 
      // Otherwise, prompt user to get valid Play Services APK. 
      if (!AppUtils.isLocationEnabled(mContext)) { 
       // notify user 
       AlertDialog.Builder dialog = new AlertDialog.Builder(mContext); 
       dialog.setMessage("Location not enabled!"); 
       dialog.setPositiveButton("Open location settings", new DialogInterface.OnClickListener() { 
        @Override 
        public void onClick(DialogInterface paramDialogInterface, int paramInt) { 
         Intent myIntent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS); 
         startActivity(myIntent); 
        } 
       }); 
       dialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() { 

        @Override 
        public void onClick(DialogInterface paramDialogInterface, int paramInt) { 
         // TODO Auto-generated method stub 

        } 
       }); 
       dialog.show(); 
      } 
      buildGoogleApiClient(); 
     } else { 
      Toast.makeText(mContext, "Location not supported in this device", Toast.LENGTH_SHORT).show(); 
     } 

    } 


    @Override 
    public void onMapReady(GoogleMap googleMap) { 
     Log.d(TAG, "OnMapReady"); 
     mMap = googleMap; 

     mMap.setOnCameraChangeListener(new GoogleMap.OnCameraChangeListener() { 
      @Override 
      public void onCameraChange(CameraPosition cameraPosition) { 
       Log.d("Camera postion change" + "", cameraPosition + ""); 
       mCenterLatLong = cameraPosition.target; 


       mMap.clear(); 

       try { 

        Location mLocation = new Location(""); 
        mLocation.setLatitude(mCenterLatLong.latitude); 
        mLocation.setLongitude(mCenterLatLong.longitude); 

        startIntentService(mLocation); 
        mLocationMarkerText.setText("Lat : " + mCenterLatLong.latitude + "," + "Long : " + mCenterLatLong.longitude); 

       } catch (Exception e) { 
        e.printStackTrace(); 
       } 
      } 
     }); 
     if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) { 
      // TODO: Consider calling 
      // ActivityCompat#requestPermissions 
      // here to request the missing permissions, and then overriding 
      // public void onRequestPermissionsResult(int requestCode, String[] permissions, 
      //           int[] grantResults) 
      // to handle the case where the user grants the permission. See the documentation 
      // for ActivityCompat#requestPermissions for more details. 
      return; 
     } 
//  mMap.setMyLocationEnabled(true); 
//  mMap.getUiSettings().setMyLocationButtonEnabled(true); 
// 
//  // 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)); 
    } 

    @Override 
    public void onConnected(Bundle bundle) { 
     if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) { 
      // TODO: Consider calling 
      // ActivityCompat#requestPermissions 
      // here to request the missing permissions, and then overriding 
      // public void onRequestPermissionsResult(int requestCode, String[] permissions, 
      //           int[] grantResults) 
      // to handle the case where the user grants the permission. See the documentation 
      // for ActivityCompat#requestPermissions for more details. 
      return; 
     } 
     Location mLastLocation = LocationServices.FusedLocationApi.getLastLocation(
       mGoogleApiClient); 
     if (mLastLocation != null) { 
      changeMap(mLastLocation); 
      Log.d(TAG, "ON connected"); 

     } else 
      try { 
       LocationServices.FusedLocationApi.removeLocationUpdates(
         mGoogleApiClient, this); 

      } catch (Exception e) { 
       e.printStackTrace(); 
      } 
     try { 
      LocationRequest mLocationRequest = new LocationRequest(); 
      mLocationRequest.setInterval(10000); 
      mLocationRequest.setFastestInterval(5000); 
      mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY); 
      LocationServices.FusedLocationApi.requestLocationUpdates(
        mGoogleApiClient, mLocationRequest, this); 

     } catch (Exception e) { 
      e.printStackTrace(); 
     } 

    } 

    @Override 
    public void onConnectionSuspended(int i) { 
     Log.i(TAG, "Connection suspended"); 
     mGoogleApiClient.connect(); 
    } 

    @Override 
    public void onLocationChanged(Location location) { 
     try { 
      if (location != null) 
       changeMap(location); 
      LocationServices.FusedLocationApi.removeLocationUpdates(
        mGoogleApiClient, this); 

     } catch (Exception e) { 
      e.printStackTrace(); 
     } 
    } 

    @Override 
    public void onConnectionFailed(ConnectionResult connectionResult) { 

    } 


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

    @Override 
    protected void onStart() { 
     super.onStart(); 
     try { 
      mGoogleApiClient.connect(); 

     } catch (Exception e) { 
      e.printStackTrace(); 
     } 
    } 

    @Override 
    protected void onStop() { 
     super.onStop(); 
     try { 

     } catch (RuntimeException e) { 
      e.printStackTrace(); 
     } 
     if (mGoogleApiClient != null && mGoogleApiClient.isConnected()) { 
      mGoogleApiClient.disconnect(); 
     } 
    } 

    private boolean checkPlayServices() { 
     int resultCode = GooglePlayServicesUtil.isGooglePlayServicesAvailable(this); 
     if (resultCode != ConnectionResult.SUCCESS) { 
      if (GooglePlayServicesUtil.isUserRecoverableError(resultCode)) { 
       GooglePlayServicesUtil.getErrorDialog(resultCode, this, 
         PLAY_SERVICES_RESOLUTION_REQUEST).show(); 
      } else { 
       //finish(); 
      } 
      return false; 
     } 
     return true; 
    } 

    private void changeMap(Location location) { 

     Log.d(TAG, "Reaching map" + mMap); 


     if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) { 
      // TODO: Consider calling 
      // ActivityCompat#requestPermissions 
      // here to request the missing permissions, and then overriding 
      // public void onRequestPermissionsResult(int requestCode, String[] permissions, 
      //           int[] grantResults) 
      // to handle the case where the user grants the permission. See the documentation 
      // for ActivityCompat#requestPermissions for more details. 
      return; 
     } 

     // check if map is created successfully or not 
     if (mMap != null) { 
      mMap.getUiSettings().setZoomControlsEnabled(false); 
      LatLng latLong; 


      latLong = new LatLng(location.getLatitude(), location.getLongitude()); 

      CameraPosition cameraPosition = new CameraPosition.Builder() 
        .target(latLong).zoom(19f).tilt(70).build(); 

      mMap.setMyLocationEnabled(true); 
      mMap.getUiSettings().setMyLocationButtonEnabled(true); 
      mMap.animateCamera(CameraUpdateFactory 
        .newCameraPosition(cameraPosition)); 

      mLocationMarkerText.setText("Lat : " + location.getLatitude() + "," + "Long : " + location.getLongitude()); 
      startIntentService(location); 


     } else { 
      Toast.makeText(getApplicationContext(), 
        "Sorry! unable to create maps", Toast.LENGTH_SHORT) 
        .show(); 
     } 

    } 


    /** 
    * Receiver for data sent from FetchAddressIntentService. 
    */ 
    class AddressResultReceiver extends ResultReceiver { 
     public AddressResultReceiver(Handler handler) { 
      super(handler); 
     } 

     /** 
     * Receives data sent from FetchAddressIntentService and updates the UI in MainActivity. 
     */ 
     @Override 
     protected void onReceiveResult(int resultCode, Bundle resultData) { 

      // Display the address string or an error message sent from the intent service. 
      mAddressOutput = resultData.getString(AppUtils.LocationConstants.RESULT_DATA_KEY); 

      mAreaOutput = resultData.getString(AppUtils.LocationConstants.LOCATION_DATA_AREA); 

      mCityOutput = resultData.getString(AppUtils.LocationConstants.LOCATION_DATA_CITY); 
      mStateOutput = resultData.getString(AppUtils.LocationConstants.LOCATION_DATA_STREET); 

      displayAddressOutput(); 

      // Show a toast message if an address was found. 
      if (resultCode == AppUtils.LocationConstants.SUCCESS_RESULT) { 
       // showToast(getString(R.string.address_found)); 


      } 


     } 

    } 

    /** 
    * Updates the address in the UI. 
    */ 
    protected void displayAddressOutput() { 
     // mLocationAddressTextView.setText(mAddressOutput); 
     try { 
      if (mAreaOutput != null) 
       // mLocationText.setText(mAreaOutput+ ""); 

       mLocationAddress.setText(mAddressOutput); 
      //mLocationText.setText(mAreaOutput); 
     } catch (Exception e) { 
      e.printStackTrace(); 
     } 
    } 

    /** 
    * Creates an intent, adds location data to it as an extra, and starts the intent service for 
    * fetching an address. 
    */ 
    protected void startIntentService(Location mLocation) { 
     // Create an intent for passing to the intent service responsible for fetching the address. 
     Intent intent = new Intent(this, FetchAddressIntentService.class); 

     // Pass the result receiver as an extra to the service. 
     intent.putExtra(AppUtils.LocationConstants.RECEIVER, mResultReceiver); 

     // Pass the location data as an extra to the service. 
     intent.putExtra(AppUtils.LocationConstants.LOCATION_DATA_EXTRA, mLocation); 

     // Start the service. If the service isn't already running, it is instantiated and started 
     // (creating a process for it if needed); if it is running then it remains running. The 
     // service kills itself automatically once all intents are processed. 
     startService(intent); 
    } 


    private void openAutocompleteActivity() { 
     try { 
      // The autocomplete activity requires Google Play Services to be available. The intent 
      // builder checks this and throws an exception if it is not the case. 
      Intent intent = new PlaceAutocomplete.IntentBuilder(PlaceAutocomplete.MODE_FULLSCREEN) 
        .build(this); 
      startActivityForResult(intent, REQUEST_CODE_AUTOCOMPLETE); 
     } catch (GooglePlayServicesRepairableException e) { 
      // Indicates that Google Play Services is either not installed or not up to date. Prompt 
      // the user to correct the issue. 
      GoogleApiAvailability.getInstance().getErrorDialog(this, e.getConnectionStatusCode(), 
        0 /* requestCode */).show(); 
     } catch (GooglePlayServicesNotAvailableException e) { 
      // Indicates that Google Play Services is not available and the problem is not easily 
      // resolvable. 
      String message = "Google Play Services is not available: " + 
        GoogleApiAvailability.getInstance().getErrorString(e.errorCode); 

      Toast.makeText(mContext, message, Toast.LENGTH_SHORT).show(); 
     } 
    } 

    /** 
    * Called after the autocomplete activity has finished to return its result. 
    */ 
    @Override 
    public void onActivityResult(int requestCode, int resultCode, Intent data) { 
     super.onActivityResult(requestCode, resultCode, data); 

     // Check that the result was from the autocomplete widget. 
     if (requestCode == REQUEST_CODE_AUTOCOMPLETE) { 
      if (resultCode == RESULT_OK) { 
       // Get the user's selected place from the Intent. 
       Place place = PlaceAutocomplete.getPlace(mContext, data); 

       // TODO call location based filter 


       LatLng latLong; 


       latLong = place.getLatLng(); 

       //mLocationText.setText(place.getName() + ""); 

       CameraPosition cameraPosition = new CameraPosition.Builder() 
         .target(latLong).zoom(19f).tilt(70).build(); 

       if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) { 
        // TODO: Consider calling 
        // ActivityCompat#requestPermissions 
        // here to request the missing permissions, and then overriding 
        // public void onRequestPermissionsResult(int requestCode, String[] permissions, 
        //           int[] grantResults) 
        // to handle the case where the user grants the permission. See the documentation 
        // for ActivityCompat#requestPermissions for more details. 
        return; 
       } 
       mMap.setMyLocationEnabled(true); 
       mMap.animateCamera(CameraUpdateFactory 
         .newCameraPosition(cameraPosition)); 


      } 


     } else if (resultCode == PlaceAutocomplete.RESULT_ERROR) { 
      Status status = PlaceAutocomplete.getStatus(mContext, data); 
     } else if (resultCode == RESULT_CANCELED) { 
      // Indicates that the activity closed before a selection was made. For example if 
      // the user pressed the back button. 
     } 
    } 


} 

XML佈局

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:background="@android:color/white" 
    android:orientation="vertical"> 

    <LinearLayout 
     android:id="@+id/container_toolbar" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:orientation="vertical"> 

     <LinearLayout 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:layout_marginLeft="5dp" 
      android:layout_marginRight="5dp" 
      android:layout_marginTop="5dp" 
      android:orientation="vertical"> 

      <EditText 
       android:id="@+id/Address" 
       android:layout_width="match_parent" 
       android:layout_height="wrap_content" 
       android:layout_marginTop="5dp" 
       android:ellipsize="end" 
       android:enabled="false" 
       android:hint="Address" 
       android:singleLine="true" /> 
     </LinearLayout> 
    </LinearLayout> 
    <FrameLayout 
     android:layout_width="match_parent" 
     android:layout_height="match_parent" 
     android:layout_below="@+id/container_toolbar"> 

     <fragment 
      xmlns:tools="http://schemas.android.com/tools" 
      android:id="@+id/map" 
      android:name="com.google.android.gms.maps.SupportMapFragment" 
      android:layout_width="match_parent" 
      android:layout_height="match_parent" 
      tools:context="com.sample.sishin.maplocation.MapsActivity" /> 
     <LinearLayout 
      android:id="@+id/locationMarker" 
      android:layout_width="wrap_content" 
      android:layout_height="wrap_content" 
      android:layout_gravity="center" 
      android:layout_marginBottom="30dp" 
      android:gravity="center" 
      android:orientation="vertical" > 

      <TextView 
       android:id="@+id/locationMarkertext" 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:background="@drawable/rounded_corner_map" 
       android:gravity="center" 
       android:minWidth="250dp" 
       android:paddingLeft="2dp" 
       android:paddingRight="2dp" 
       android:text=" Set your Location " 
       android:textColor="@android:color/white" /> 

      <ImageView 
       android:id="@+id/imageMarker" 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:src="@drawable/add_marker" /> 
     </LinearLayout> 



    </FrameLayout> 
    </RelativeLayout> 

地址提取程序服務

import android.app.IntentService; 
import android.content.Intent; 
import android.location.Address; 
import android.location.Geocoder; 
import android.location.Location; 
import android.os.Bundle; 
import android.os.ResultReceiver; 
import android.text.TextUtils; 
import android.util.Log; 

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



public class FetchAddressIntentService extends IntentService { 
    private static final String TAG = "FetchAddressIS"; 


    protected ResultReceiver mReceiver; 

    /** 
    * This constructor is required, and calls the super IntentService(String) 
    * constructor with the name for a worker thread. 
    */ 
    public FetchAddressIntentService() { 
     // Use the TAG to name the worker thread. 
     super(TAG); 
    } 

    @Override 
    protected void onHandleIntent(Intent intent) { 
     String errorMessage = ""; 

     mReceiver = intent.getParcelableExtra(AppUtils.LocationConstants.RECEIVER); 


     if (mReceiver == null) { 
      Log.wtf(TAG, "No receiver received. There is nowhere to send the results."); 
      return; 
     } 
     // Get the location passed to this service through an extra. 
     Location location = intent.getParcelableExtra(AppUtils.LocationConstants.LOCATION_DATA_EXTRA); 



     if (location == null) { 
      errorMessage = getString(R.string.no_location_data_provided); 
      Log.wtf(TAG, errorMessage); 
      deliverResultToReceiver(AppUtils.LocationConstants.FAILURE_RESULT, errorMessage, null); 
      return; 
     } 



     List<Address> addresses = null; 

     try { 

      addresses = geocoder.getFromLocation(
        location.getLatitude(), 
        location.getLongitude(), 
        // In this sample, we get just a single address. 
        1); 
     } catch (IOException ioException) { 
      // Catch network or other I/O problems. 
      errorMessage = getString(R.string.service_not_available); 
      Log.e(TAG, errorMessage, ioException); 
     } catch (IllegalArgumentException illegalArgumentException) { 
      // Catch invalid latitude or longitude values. 
      errorMessage = getString(R.string.invalid_lat_long_used); 
      Log.e(TAG, errorMessage + ". " + 
        "Latitude = " + location.getLatitude() + 
        ", Longitude = " + location.getLongitude(), illegalArgumentException); 
     } 

     // Handle case where no address was found. 
     if (addresses == null || addresses.size() == 0) { 
      if (errorMessage.isEmpty()) { 
       errorMessage = getString(R.string.no_address_found); 
       Log.e(TAG, errorMessage); 
      } 
      deliverResultToReceiver(AppUtils.LocationConstants.FAILURE_RESULT, errorMessage, null); 
     } else { 
      Address address = addresses.get(0); 
      ArrayList<String> addressFragments = new ArrayList<String>(); 

      for (int i = 0; i < address.getMaxAddressLineIndex(); i++) { 
       addressFragments.add(address.getAddressLine(i)); 

      } 
      deliverResultToReceiver(AppUtils.LocationConstants.SUCCESS_RESULT, 
        TextUtils.join(System.getProperty("line.separator"), addressFragments), address); 


     } 
    } 


    private void deliverResultToReceiver(int resultCode, String message, Address address) { 
     try { 
      Bundle bundle = new Bundle(); 
      bundle.putString(AppUtils.LocationConstants.RESULT_DATA_KEY, message); 

      bundle.putString(AppUtils.LocationConstants.LOCATION_DATA_AREA, address.getSubLocality()); 

      bundle.putString(AppUtils.LocationConstants.LOCATION_DATA_CITY, address.getLocality()); 
      bundle.putString(AppUtils.LocationConstants.LOCATION_DATA_STREET, address.getAddressLine(0)); 

      mReceiver.send(resultCode, bundle); 
     } catch (Exception e) { 
      e.printStackTrace(); 
     } 
    } 


}