Google Map Api for Android

Posted 2022-11-30 xbw12138

Google Map Api for android

项目需要使用了谷歌的地图api，总结一下。
先上几个图

一、项目介绍

1.点击搜索附近的公园

这个展示的可以点击地图的任意位置获取经纬度，并标记Mark一个点，同时获取附近的公园，就是POI Search，并把所有的公园在地图上标记出来。

2.搜索当前位置附近的公园

这个是通过定位，获取附近的公园

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二、实现过程

1.Google Map Api Key申请

获取api key，基本的api可以不用绑定信用卡激活账号，在安卓中的定位，显示地图等操作就不需要激活账号。搜索附近的公园等POI操作的api就需要激活账号了。关于api的获取就不细说了。

2.新建Android项目

在Android Studio中，新建一个Map Activity，这个是自带的，我们只需要在debug目录下填入申请的api key就可以了。

3.需求–定位当前位置获取兴趣点（获取附近的公园）

MainActivity

package com.example.cacp;

import android.Manifest;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.location.Location;
import android.os.Build;
import android.os.Bundle;
import android.support.v4.app.ActivityCompat;
import android.support.v4.app.FragmentActivity;
import android.support.v4.content.ContextCompat;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;

import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GoogleApiAvailability;
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;

public class MainActivity extends FragmentActivity implements OnMapReadyCallback,
        GoogleApiClient.ConnectionCallbacks,
        GoogleApiClient.OnConnectionFailedListener,
        LocationListener 
    //google map
    private GoogleMap mMap;
    double latitude;
    double longitude;
    //search nearby interest range
    private int PROXIMITY_RADIUS = 10000;
    GoogleApiClient mGoogleApiClient;
    Location mLastLocation;
    Marker mCurrLocationMarker;
    LocationRequest mLocationRequest;
    private Context mContext;
    private Button btn_list;
    @Override
    protected void onCreate(Bundle savedInstanceState) 
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_maps);
        mContext = this;
        btn_list = findViewById(R.id.btn_list);
        if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) 
            checkLocationPermission();
        

        //Check if Google Play Services Available or not
        if (!CheckGooglePlayServices()) 
            Log.d("onCreate", "Finishing test case since Google Play Services are not available");
            finish();
        
        else 
            Log.d("onCreate","Google Play Services available.");
        

        // 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);
        btn_list.setOnClickListener(new View.OnClickListener() 
            @Override
            public void onClick(View view) 
                startActivity(new Intent(MainActivity.this,ListActivity.class));
            
        );
    

    private boolean CheckGooglePlayServices() 
        GoogleApiAvailability googleAPI = GoogleApiAvailability.getInstance();
        int result = googleAPI.isGooglePlayServicesAvailable(this);
        if(result != ConnectionResult.SUCCESS) 
            if(googleAPI.isUserResolvableError(result)) 
                googleAPI.getErrorDialog(this, result,
                        0).show();
            
            return false;
        
        return true;
    


    /**
     * 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;
        mMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
        buildGoogleApiClient();
        mMap.setMyLocationEnabled(true);
    
    private void POI()
        mMap.clear();
        if (mCurrLocationMarker != null) 
            mCurrLocationMarker.remove();
        
        String url = getUrl(latitude, longitude, "park");
        Object[] DataTransfer = new Object[4];
        DataTransfer[0] = mMap;
        DataTransfer[1] = url;
        DataTransfer[2] = mContext;
        DataTransfer[3] = btn_list;
        GetNearbyPlacesData getNearbyPlacesData = new GetNearbyPlacesData();
        getNearbyPlacesData.execute(DataTransfer);
    
    protected synchronized void buildGoogleApiClient() 
        mGoogleApiClient = new GoogleApiClient.Builder(this)
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this)
                .addApi(LocationServices.API)
                .build();
        mGoogleApiClient.connect();
    
    @Override
    public void onConnected(Bundle bundle) 
        mLocationRequest = new LocationRequest();
        mLocationRequest.setInterval(1000);
        mLocationRequest.setFastestInterval(1000);
mLocationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);
        if (ContextCompat.checkSelfPermission(this,
                Manifest.permission.ACCESS_FINE_LOCATION)
                == PackageManager.PERMISSION_GRANTED) 
            LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
        
    
    private String getUrl(double latitude, double longitude, String nearbyPlace) 
        StringBuilder googlePlaceUrl = new StringBuilder("https://maps.googleapis.com/maps/api/place/nearbysearch/json?");
        googlePlaceUrl.append("location="+latitude+","+longitude);
        googlePlaceUrl.append("&radius="+PROXIMITY_RADIUS);
        googlePlaceUrl.append("&type="+nearbyPlace);
        googlePlaceUrl.append("&sensor=true");
        googlePlaceUrl.append("&key="+"不让你看我的key");
        Log.d("getUrl", googlePlaceUrl.toString());
        return (googlePlaceUrl.toString());
    
    @Override
    public void onConnectionSuspended(int i) 

    
    @Override
    public void onLocationChanged(Location location) 
        Log.d("onLocationChanged", "entered");
        mLastLocation = location;
        if (mCurrLocationMarker != null) 
            mCurrLocationMarker.remove();
        
        //Place current location marker
        latitude = location.getLatitude();
        longitude = location.getLongitude();
        LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude());
        MarkerOptions markerOptions = new MarkerOptions();
        markerOptions.position(latLng);
        markerOptions.title("Current Position");
markerOptions.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_MAGENTA));
        mCurrLocationMarker = mMap.addMarker(markerOptions);
        //move map camera
        mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
        mMap.animateCamera(CameraUpdateFactory.zoomTo(11));
        Toast.makeText(MainActivity.this,"Your Current Location", Toast.LENGTH_LONG).show();
        Log.d("onLocationChanged", String.format("latitude:%.3f longitude:%.3f",latitude,longitude));
        //stop location updates
        if (mGoogleApiClient != null) 
LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
            Log.d("onLocationChanged", "Removing Location Updates");
        
        Log.d("onLocationChanged", "Exit");
        POI();
    
    @Override
    public void onConnectionFailed(ConnectionResult connectionResult) 

    

处理后的数据用来在地图上标记兴趣点，我们给了标记点点击事件，并传递了一些数据。
GetNearbyPlacesData

package com.example.cacp;
import android.content.Context;
import android.content.Intent;
import android.os.AsyncTask;
import android.util.Log;
import android.view.View;
import android.widget.Button;

import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
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.util.HashMap;
import java.util.List;
public class GetNearbyPlacesData extends AsyncTask<Object, String, String> 
    String googlePlacesData;
    GoogleMap mMap;
    String url;
    Context mContext;
    Button btn_list;
    @Override
    protected String doInBackground(Object... params) 
        try 
            Log.d("GetNearbyPlacesData", "doInBackground entered");
            mMap = (GoogleMap) params[0];
            url = (String) params[1];
            mContext = (Context) params[2];
            btn_list = (Button) params[3];
            DownloadUrl downloadUrl = new DownloadUrl();
            googlePlacesData = downloadUrl.readUrl(url);
            Log.d("GooglePlacesReadTask", "doInBackground Exit");
         catch (Exception e) 
            Log.d("GooglePlacesReadTask", e.toString());
        
        return googlePlacesData;
    
    @Override
    protected void onPostExecute(String result) 
        Log.d("GooglePlacesReadTask", "onPostExecute Entered");
        List<HashMap<String, String>> nearbyPlacesList = null;
        DataParser dataParser = new DataParser();
        nearbyPlacesList =  dataParser.parse(result);
        Singleton.getInstance().setListPlace(nearbyPlacesList);
        ShowNearbyPlaces(nearbyPlacesList);
        btn_list.setVisibility(View.VISIBLE);
        Log.d("GooglePlacesReadTask", "onPostExecute Exit");
    
    private void ShowNearbyPlaces(List<HashMap<String, String>> nearbyPlacesList) 
        for (int i = 0; i < nearbyPlacesList.size(); i++) 
            Log.d("onPostExecute","Entered into showing locations");
            MarkerOptions markerOptions = new MarkerOptions();
            final HashMap<String, String> googlePlace = nearbyPlacesList.get(i);
            double lat = Double.parseDouble(googlePlace.get("lat"));
            double lng = Double.parseDouble(googlePlace.get("lng"));
            String placeName = googlePlace.get("place_name");
            String vicinity = googlePlace.get("vicinity");
            LatLng latLng = new LatLng(lat, lng);
            markerOptions.position(latLng);
            markerOptions.title(placeName + " : " + vicinity);
            mMap.addMarker(markerOptions);
            markerOptions.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED));
            //move map camera
            mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
            mMap.animateCamera(CameraUpdateFactory.zoomTo(11));
            mMap.setOnMarkerClickListener(new GoogleMap.OnMarkerClickListener() 
                @Override
                public boolean onMarkerClick(Marker marker) 
                    Intent intent = new Intent(mContext, DetailActivity.class);
                    intent.putExtra("placename", googlePlace.get("place_name"));
                    intent.putExtra("id", googlePlace.get("id"));
                    intent.putExtra("rating", "rating :" + googlePlace.get("rating"));
                    intent.putExtra("info", googlePlace.get("lat")+","+googlePlace.get("lng"));
                    final String photoUrl = "https://maps.googleapis.com/maps/api/place/photo?maxwidth=400&photoreference="+ googlePlace.get("photo_reference") +"&key=不让你看我的key";
                    intent.putExtra("photourl", photoUrl);
                    mContext.startActivity(intent);
                    return false;
                
            );
        
    

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4.需求–任意点击屏幕位置获取附近兴趣点（获取附近的公园）

我们只是把定位那一部分换成了监听点击地图事件

GoogleMap点击事件监听

mMap.setOnMapClickListener(new GoogleMap.OnMapClickListener() 
            @Override
            public void onMapClick(LatLng latLng) 
                markPark(latLng);
            
        );

Mark标记点

private void markPark(LatLng latLng)
        mMap.clear();
        if (mCurrLocationMarker != null) 
            mCurrLocationMarker.remove();
        
        MarkerOptions markerOptions = new MarkerOptions();
        markerOptions.position(latLng);
        markerOptions.title("Current Position");
        markerOptions.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_MAGENTA));
        mCurrLocationMarker = mMap.addMarker(markerOptions);
        //move map camera
        mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
        mMap.animateCamera(CameraUpdateFactory.zoomTo(11));
        POI(latLng);
        Toast.makeText(Main2Activity.this,String.format("latitude:%.3f longitude:%.3f",latLng.latitude,latLng.longitude),Toast.LENGTH_LONG).show();
    

完整代码

package com.example.cacp;

import android.Manifest;
import android.content.Context;
import android.content.pm.PackageManager;
import android.os.Build;
import android.os.Bundle;
import android.support.v4.app.ActivityCompat;
import android.support.v4.app.FragmentActivity;
import android.support.v4.content.ContextCompat;
import android.util.Log;
import android.widget.Button;
import android.widget.Toast;

import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GoogleApiAvailability;
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;

public class Main2Activity extends FragmentActivity implements OnMapReadyCallback 
    private GoogleMap mMap;
    private Marker mCurrLocationMarker;
    private int PROXIMITY_RADIUS = 10000;
    private Context mContext;
    private Button btn_list;
    @Override
    protected void onCreate(Bundle savedInstanceState) 
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_maps);
        mContext = this;
        btn_list = findViewById(R.id.btn_list);
        if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) 
            checkLocationPermission();
        
        //Check if Google Play Services Available or not
        if (!CheckGooglePlayServices()) 
            Log.d("onCreate", "Finishing test case since Google Play Services are not available");
            finish();
        
        else 
            Log.d("onCreate","Google Play Services available.");
        
        // 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);
    
    private boolean CheckGooglePlayServices() 
        GoogleApiAvailability googleAPI = GoogleApiAvailability.getInstance();
        int result = googleAPI.isGooglePlayServicesAvailable(this);
        if(result != ConnectionResult.SUCCESS) 
            if(googleAPI.isUserResolvableError(result)) 
                googleAPI.getErrorDialog(this, result,
                        0).show();
            
            return false;
        
        return true;
    
    @Override
    public void onMapReady(GoogleMap googleMap) 
        mMap = googleMap;
        mMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
        if (android.os.Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) 
            if (ContextCompat.checkSelfPermission(this,
                    Manifest.permission.ACCESS_FINE_LOCATION)
                    == PackageManager.PERMISSION_GRANTED) 
                mMap.setMyLocationEnabled(true);
            
        
        else 
            mMap.setMyLocationEnabled(true);
        
        markPark(new LatLng(52.388,-1.291));
        mMap.setOnMapClickListener(new GoogleMap.OnMapClickListener() 
            @Override
            public void onMapClick(LatLng latLng) 
                markPark(latLng);
            
        );
    
    private void markPark(LatLng latLng)
        mMap.clear();
        if (mCurrLocationMarker != null) 
            mCurrLocationMarker.remove();
        
        MarkerOptions markerOptions = new MarkerOptions();
        markerOptions.position(latLng);
        markerOptions.title("Current Position");
        markerOptions.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_MAGENTA));
        mCurrLocationMarker = mMap.addMarker(markerOptions);
        //move map camera
        mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
        mMap.animateCamera(CameraUpdateFactory.zoomTo(11));
        POI(latLng);
        Toast.makeText(Main2Activity.this,String.format("latitude:%.3f longitude:%.3f",latLng.latitude,latLng.longitude),Toast.LENGTH_LONG).show();
    
    public static final int MY_PERMISSIONS_REQUEST_LOCATION = 99;
    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,
                        MY_PERMISSIONS_REQUEST_LOCATION);
             else 
                ActivityCompat.requestPermissions(this,
                        new String[]Manifest.permission.ACCESS_FINE_LOCATION,
                        MY_PERMISSIONS_REQUEST_LOCATION);
            
            return false;
         else 
            return true;
        
    
    @Override
    public void onRequestPermissionsResult(int requestCode,
                                           String permissions[], int[] grantResults) 
        switch (requestCode) 
            case MY_PERMISSIONS_REQUEST_LOCATION: 
                if (grantResults.length > 0
                        && grantResults[0] == PackageManager.PERMISSION_GRANTED) 
                    if (ContextCompat.checkSelfPermission(this,
                            Manifest.permission.ACCESS_FINE_LOCATION)
                            == PackageManager.PERMISSION_GRANTED) 
                        mMap.setMyLocationEnabled(true);
                    
                 else 
                    Toast.makeText(this, "permission denied", Toast.LENGTH_LONG).show();
                
                return;
            
        
    
    private void POI(LatLng latLng)
        String url = getUrl(latLng.latitude, latLng.longitude, "park");
        Object[] DataTransfer = new Object[4];
        DataTransfer[0] = mMap;
        DataTransfer[1] = url;
        DataTransfer[2] = mContext;
        DataTransfer[3] = btn_list;
        GetNearbyPlacesData getNearbyPlacesData = new GetNearbyPlacesData();
        getNearbyPlacesData.execute(DataTransfer);
    
    private String getUrl(double latitude, double longitude, String nearbyPlace) 
        StringBuilder googlePlaceUrl = new StringBuilder("https://maps.googleapis.com/maps/api/place/nearbysearch/json?");
        googlePlaceUrl.append("location="+latitude+","+longitude);
        googlePlaceUrl.append("&radius="+PROXIMITY_RADIUS);
        googlePlaceUrl.append("&type="+nearbyPlace);
        googlePlaceUrl.append("&sensor=true");
        googlePlaceUrl.append("&key="+"不给你看我的key");
        Log.d("getUrl", googlePlaceUrl.toString());
        return (googlePlaceUrl.toString());
    

两部分的xml文件都一样，都可以用Android Studio自动生成的Map Activity的布局文件

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三、需要demo的请留言

需要demo的请留言