Android 在百度地圖上顯示自己的實時位置

一、題目

Android 在百度地圖上顯示自己的實時位置

二、環境

Android Studio

三、代碼實作

在使用下面代碼之前，需要匯入百度地圖的包和AK嗎，

可以去百度地圖開發的開發檔案尋找自己需要的部分，檔案有教怎樣申請AK和匯入百度地圖的包，

百度地圖開發頁面
點擊這里可以直達開發頁面，

package com.example.children;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;

import android.Manifest;
import android.content.pm.PackageManager;
import android.os.Bundle;
import android.widget.TextView;
import android.widget.Toast;

import com.baidu.location.BDAbstractLocationListener;
import com.baidu.location.BDLocation;
import com.baidu.location.LocationClient;
import com.baidu.location.LocationClientOption;
import com.baidu.mapapi.SDKInitializer;
import com.baidu.mapapi.map.BaiduMap;
import com.baidu.mapapi.map.MapStatusUpdate;
import com.baidu.mapapi.map.MapStatusUpdateFactory;
import com.baidu.mapapi.map.MapView;
import com.baidu.mapapi.map.MyLocationData;
import com.baidu.mapapi.model.LatLng;
import com.example.children.MenuActivity;
import com.example.children.R;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {
    TextView locationInfo;
    LocationClient mLocationClient;
    MapView mMapView;
    BaiduMap mBaiduMap = null;
    boolean isFirstLocate = true;
//     當前定位模式
//    private MyLocationConfiguration.LocationMode locationMode;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //此方法要再setContentView方法之前實作
        SDKInitializer.initialize(getApplicationContext());
        setContentView(R.layout.activity_main);
        locationInfo = findViewById(R.id.locationInfo);

        mLocationClient = new LocationClient((getApplicationContext()));
        mLocationClient.registerLocationListener(new MyLocationListener());

        //獲取地圖控制元件參考
        mMapView = findViewById(R.id.bmapView);
        // 得到地圖
        mBaiduMap = mMapView.getMap();
        // 開啟定位圖層
        mBaiduMap.setMyLocationEnabled(true);
        //定位初始化
        mLocationClient = new LocationClient(this);

        //通過LocationClientOption設定LocationClient相關引數
        LocationClientOption option = new LocationClientOption();
        option.setOpenGps(true); // 打開gps
        option.setCoorType("bd09ll"); // 設定坐標型別
        option.setScanSpan(1000);
        // 可選，設定地址資訊
        option.setIsNeedAddress(true);
        //可選，設定是否需要地址描述
        option.setIsNeedLocationDescribe(true);

        //設定locationClientOption
        mLocationClient.setLocOption(option);

        //注冊LocationListener監聽器
        MyLocationListener myLocationListener = new MyLocationListener();
        mLocationClient.registerLocationListener(myLocationListener);

        List<String> permissionList = new ArrayList<>();
        //如果沒有啟動下面權限，就詢問用戶讓用戶打開
        if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
            permissionList.add(Manifest.permission.ACCESS_FINE_LOCATION);
        }
        if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.READ_PHONE_STATE) != PackageManager.PERMISSION_GRANTED) {
            permissionList.add(Manifest.permission.READ_PHONE_STATE);
        }
        if (ContextCompat.checkSelfPermission(MainActivity.this,
                Manifest.permission.WRITE_EXTERNAL_STORAGE) != PackageManager.PERMISSION_GRANTED) {
            permissionList.add(Manifest.permission.WRITE_EXTERNAL_STORAGE);
        }
        if (!permissionList.isEmpty()) {
            String[] permissions = permissionList.toArray(new String[permissionList.size()]);
            ActivityCompat.requestPermissions(MainActivity.this, permissions, 1);
        } else {
            requestLocation();
        }
    }

    /*只有同意打開相關權限才可以開啟本程式*/
    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        switch (requestCode) {
            case 1:
                if (grantResults.length > 0) {
                    for (int result : grantResults) {
                        if (result != PackageManager.PERMISSION_GRANTED) {
                            Toast.makeText(this, "必須同意所有權限才能使用本程式", Toast.LENGTH_SHORT).show();
                            finish();
                            return;
                        }
                    }
                    requestLocation();
                } else {
                    Toast.makeText(this, "發生未知錯誤", Toast.LENGTH_SHORT).show();
                    finish();
                }
                break;
            default:
        }
    }

    private void requestLocation() {
        initLocation();
        mLocationClient.start();
    }

    private void initLocation() {
        LocationClientOption option = new LocationClientOption();
        option.setLocationMode(LocationClientOption.LocationMode.Hight_Accuracy);
        option.setCoorType("bd09ll");
        option.setScanSpan(3000);//發起定位請求的間隔
        option.setOpenGps(true);
        option.setLocationNotify(true);
        option.setIgnoreKillProcess(false);
        option.SetIgnoreCacheException(false);
        option.setWifiCacheTimeOut(5 * 60 * 1000);
        option.setEnableSimulateGps(false);
        option.setIsNeedAddress(true);
        mLocationClient.setLocOption(option);
    }

    private class MyLocationListener extends BDAbstractLocationListener {
        @Override
        public void onReceiveLocation(BDLocation location) {
            navigateTo(location);
            StringBuilder currentPosition = new StringBuilder();
            currentPosition.append("緯度：").append(location.getLatitude()).append("\n");
            currentPosition.append("經線：").append(location.getLongitude()).append("\n");
            currentPosition.append("國家：").append(location.getCountry()).append("\n");
            currentPosition.append("省：").append(location.getProvince()).append("\n");
            currentPosition.append("市：").append(location.getCity()).append("\n");
            currentPosition.append("區：").append(location.getDistrict()).append("\n");
            currentPosition.append("街道：").append(location.getStreet()).append("\n");
            currentPosition.append("定位方式：");
            if (location.getLocType() == BDLocation.TypeGpsLocation) {
                currentPosition.append("GPS");
            } else if (location.getLocType() == BDLocation.TypeNetWorkLocation) {
                currentPosition.append("網路");
            }
            locationInfo.setText(currentPosition);
        }
    }
    private void navigateTo(BDLocation location){
        if(isFirstLocate) {
            LatLng ll = new LatLng(location.getLatitude(), location.getLongitude());
            MapStatusUpdate update = MapStatusUpdateFactory.newLatLng(ll);
            mBaiduMap.animateMapStatus(update);
//        縮放地圖大小
            update = MapStatusUpdateFactory.zoomTo(16f);
            mBaiduMap.animateMapStatus(update);
            isFirstLocate=false;
        }
        MyLocationData.Builder locationBuilder=new MyLocationData.Builder();
        locationBuilder.longitude(location.getLongitude());
        locationBuilder.latitude(location.getLatitude());
        MyLocationData locationData=locationBuilder.build();
        mBaiduMap.setMyLocationData(locationData);
    }
    @Override
    protected void onResume() {
        mMapView.onResume();
        super.onResume();
    }

    @Override
    protected void onPause() {
        mMapView.onPause();
        super.onPause();
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        mMapView.onDestroy();
        mBaiduMap.setMyLocationEnabled(false);
        mLocationClient.stop();
    }
}

四、實驗結果

這是在我的手機vivox21的上實驗的結果，

定位精度比較高，我使用時定位精度大概在1-10m，戶外定位基本就是自己的位置，室內定位略差，

夜神模擬器上模擬的結果：

這是我今天運行的截圖

之前我在做這個demo的時候，模擬器一直定位的是四川的某地方，范圍基本在那個縣，但是鎮、村可能不同，今天定位的是湖北偏岳陽的某地方，
還有模擬器使用百度地圖圖層時，基本默認顯示北京，

所以在做Android定位時最好用真機模擬

有問題，請留言交流！