Google Map Api for Android
2024-04-13 01:27:34
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
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 mapprivate GoogleMap mMap;double latitude;double longitude;//search nearby interest rangeprivate int PROXIMITY_RADIUS = 10000;GoogleApiClient mGoogleApiClient;Location mLastLocation;Marker mCurrLocationMarker;LocationRequest mLocationRequest;private Context mContext;private Button btn_list;@Overrideprotected 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 notif (!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() {@Overridepublic 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.*/@Overridepublic 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();}@Overridepublic 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());}@Overridepublic void onConnectionSuspended(int i) {}@Overridepublic void onLocationChanged(Location location) {Log.d("onLocationChanged", "entered");mLastLocation = location;if (mCurrLocationMarker != null) {mCurrLocationMarker.remove();}//Place current location markerlatitude = 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 cameramMap.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 updatesif (mGoogleApiClient != null) {
LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);Log.d("onLocationChanged", "Removing Location Updates");}Log.d("onLocationChanged", "Exit");POI();}@Overridepublic 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;@Overrideprotected 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;}@Overrideprotected 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 cameramMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));mMap.animateCamera(CameraUpdateFactory.zoomTo(11));mMap.setOnMarkerClickListener(new GoogleMap.OnMarkerClickListener() {@Overridepublic 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;}});}}
}
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() {@Overridepublic 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 cameramMap.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;@Overrideprotected 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 notif (!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;}@Overridepublic 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() {@Overridepublic 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 cameramMap.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;}}@Overridepublic 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
三、需要demo的请留言
需要demo的请留言
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