Google Map Api for Android

Google Map Api for Android

項目需要使用了谷歌的地圖api，總結一下。
先上幾個圖

一、項目介紹

1.點擊搜索附近的公園

這個展示的可以點擊地圖的任意位置獲取經緯度，並標記Mark一個點，同時獲取附近的公園，就是POI Search，並把所有的公園在地圖上標記出來。

2.搜索當前位置附近的公園

這個是通過定位，獲取附近的公園

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二、實現過程

1.Google Map Api Key申請

獲取api key，基本的api可以不用綁定信用卡激活賬號，在安卓中的定位，顯示地圖等操作就不需要激活賬號。搜索附近的公園等POI操作的api就需要激活賬號了。關於api的獲取就不細說了。

2.新建Android項目

在Android Studio中，新建一個Map Activity，這個是自帶的，我們只需要在debug目錄下填入申請的api key就可以了。

3.需求–定位當前位置獲取興趣點（獲取附近的公園）

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="+"不讓你看我的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) {

    }

處理後的數據用來在地圖上標記興趣點，我們給了標記點點擊事件，並傳遞了一些數據。
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=不讓你看我的key";
                    intent.putExtra("photourl", photoUrl);
                    mContext.startActivity(intent);
                    return false;
                }
            });
        }
    }
}

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4.需求–任意點擊屏幕位置獲取附近興趣點（獲取附近的公園）

我們只是把定位那一部分換成了監聽點擊地圖事件

GoogleMap點擊事件監聽

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

Mark標記點

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();
    }

完整代碼

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="+"不給你看我的key");
        Log.d("getUrl", googlePlaceUrl.toString());
        return (googlePlaceUrl.toString());
    }
}

兩部分的xml文件都一樣，都可以用Android Studio自動生成的Map Activity的佈局文件

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三、需要demo的請留言

需要demo的請留言