<?xml version="1.0" encoding="utf-8"?>

<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"

    xmlns:app="http://schemas.android.com/apk/res-auto"

    xmlns:tools="http://schemas.android.com/tools"

    android:layout_width="match_parent"

    android:layout_height="match_parent"

    tools:context=".MainActivity">

    <com.amap.api.maps.MapView

        android:id="@+id/map"

        android:layout_width="match_parent"

        android:layout_height="match_parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

package com.example.wenlocation;

import android.os.Bundle;

import android.util.Log;

import android.widget.Toast;

import androidx.appcompat.app.AppCompatActivity;

import com.amap.api.location.AMapLocation;

import com.amap.api.location.AMapLocationClient;

import com.amap.api.location.AMapLocationClientOption;

import com.amap.api.location.AMapLocationListener;

import com.amap.api.maps.AMap;

import com.amap.api.maps.CameraUpdateFactory;

import com.amap.api.maps.LocationSource;

import com.amap.api.maps.MapView;

import com.amap.api.maps.UiSettings;

import com.amap.api.maps.model.BitmapDescriptorFactory;

import com.amap.api.maps.model.LatLng;

import com.amap.api.maps.model.MarkerOptions;

import com.amap.api.maps.model.MyLocationStyle;

import java.text.SimpleDateFormat;

import java.util.Date;

public class MainActivity extends AppCompatActivity implements  LocationSource, AMapLocationListener {

    //显示地图需要的变量

    private MapView mapView;//地图控件

    private AMap aMap;//地图对象

    //定位需要的声明

    private AMapLocationClient mLocationClient = null;//定位发起端

    private AMapLocationClientOption mLocationOption = null;//定位参数

    private OnLocationChangedListener mListener = null;//定位监听器

    //标识，用于判断是否只显示一次定位信息和用户重新定位

    private boolean isFirstLoc = true;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        //显示地图

        mapView = (MapView) findViewById(R.id.map);

        //必须要写

        mapView.onCreate(savedInstanceState);

        //获取地图对象

        aMap = mapView.getMap();

        //设置显示定位按钮 并且可以点击

        UiSettings settings = aMap.getUiSettings();

        //设置定位监听

        aMap.setLocationSource(this);

        // 是否显示定位按钮

        settings.setMyLocationButtonEnabled(true);

        // 是否可触发定位并显示定位层

        aMap.setMyLocationEnabled(true);

        //定位的小图标 默认是蓝点 这里自定义一团火，其实就是一张图片

        MyLocationStyle myLocationStyle = new MyLocationStyle();

        myLocationStyle.myLocationIcon(BitmapDescriptorFactory.fromResource(R.mipmap.firetwo));

        myLocationStyle.radiusFillColor(android.R.color.transparent);

        myLocationStyle.strokeColor(android.R.color.transparent);

        aMap.setMyLocationStyle(myLocationStyle);

        //开始定位

        initLoc();

    }

    //定位

    private void initLoc() {

        //初始化定位

        mLocationClient = new AMapLocationClient(getApplicationContext());

        //设置定位回调监听

        mLocationClient.setLocationListener(this);

        //初始化定位参数

        mLocationOption = new AMapLocationClientOption();

        //设置定位模式为高精度模式，Battery_Saving为低功耗模式，Device_Sensors是仅设备模式

        mLocationOption.setLocationMode(AMapLocationClientOption.AMapLocationMode.Hight_Accuracy);

        //设置是否返回地址信息（默认返回地址信息）

        mLocationOption.setNeedAddress(true);

        //设置是否只定位一次,默认为false

        mLocationOption.setOnceLocation(false);

        //设置是否强制刷新WIFI，默认为强制刷新

        mLocationOption.setWifiActiveScan(true);

        //设置是否允许模拟位置,默认为false，不允许模拟位置

        mLocationOption.setMockEnable(false);

        //设置定位间隔,单位毫秒,默认为2000ms

        mLocationOption.setInterval(2000);

        //给定位客户端对象设置定位参数

        mLocationClient.setLocationOption(mLocationOption);

        //启动定位

        mLocationClient.startLocation();

    }

    //定位回调函数

    @Override

    public void onLocationChanged(AMapLocation amapLocation) {

        if (amapLocation != null) {

            if (amapLocation.getErrorCode() == 0) {

                //定位成功回调信息，设置相关消息

                amapLocation.getLocationType();//获取当前定位结果来源，如网络定位结果，详见官方定位类型表

                amapLocation.getLatitude();//获取纬度

                amapLocation.getLongitude();//获取经度

                amapLocation.getAccuracy();//获取精度信息

                SimpleDateFormat df = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");

                Date date = new Date(amapLocation.getTime());

                df.format(date);//定位时间

                amapLocation.getAddress();//地址，如果option中设置isNeedAddress为false，则没有此结果，网络定位结果中会有地址信息，GPS定位不返回地址信息。

                amapLocation.getCountry();//国家信息

                amapLocation.getProvince();//省信息

                amapLocation.getCity();//城市信息

                amapLocation.getDistrict();//城区信息

                amapLocation.getStreet();//街道信息

                amapLocation.getStreetNum();//街道门牌号信息

                amapLocation.getCityCode();//城市编码

                amapLocation.getAdCode();//地区编码

                // 如果不设置标志位，此时再拖动地图时，它会不断将地图移动到当前的位置

                if (isFirstLoc) {

                    //设置缩放级别

                    aMap.moveCamera(CameraUpdateFactory.zoomTo(17));

                    //将地图移动到定位点

                    aMap.moveCamera(CameraUpdateFactory.changeLatLng(new LatLng(amapLocation.getLatitude(), amapLocation.getLongitude())));

                    //点击定位按钮 能够将地图的中心移动到定位点

                    mListener.onLocationChanged(amapLocation);

                    //添加图钉

                    aMap.addMarker(getMarkerOptions(amapLocation));

                    /* 获取定位信息 */

                    StringBuffer buffer = new StringBuffer();

                    buffer.append(amapLocation.getCountry() + "" + amapLocation.getProvince() + "" + amapLocation.getCity() + "" + amapLocation.getProvince() + "" + amapLocation.getDistrict() + "" + amapLocation.getStreet() + "" + amapLocation.getStreetNum());

                    Toast.makeText(getApplicationContext(), buffer.toString(), Toast.LENGTH_LONG).show();

                    isFirstLoc = false;

                }

            } else {

                //显示错误信息ErrCode是错误码，errInfo是错误信息，详见错误码表。

                Log.e("AmapError", "location Error, ErrCode:"

                        + amapLocation.getErrorCode() + ", errInfo:"

                        + amapLocation.getErrorInfo());

                Log.d("AmapError", "location Error, ErrCode:"

                        + amapLocation.getErrorCode() + ", errInfo:"

                        + amapLocation.getErrorInfo());

                Log.w("AmapError", "location Error, ErrCode:"

                        + amapLocation.getErrorCode() + ", errInfo:"

                        + amapLocation.getErrorInfo());

                Toast.makeText(getApplicationContext(), "定位失败", Toast.LENGTH_LONG).show();

                Toast.makeText(getApplicationContext(), amapLocation.getErrorInfo(), Toast.LENGTH_LONG).show();

                Toast.makeText(getApplicationContext(), amapLocation.getErrorCode(), Toast.LENGTH_LONG).show();

            }

        }

    }

    //自定义一个图钉，并且设置图标，当我们点击图钉时，显示设置的信息

    private MarkerOptions getMarkerOptions(AMapLocation amapLocation) {

        //设置图钉选项

        MarkerOptions options = new MarkerOptions();

        //图标

        options.icon(BitmapDescriptorFactory.fromResource(R.mipmap.firetwo));

        //位置

        options.position(new LatLng(amapLocation.getLatitude(), amapLocation.getLongitude()));

        StringBuffer buffer = new StringBuffer();

        buffer.append(amapLocation.getCountry() + "" + amapLocation.getProvince() + "" + amapLocation.getCity() +  "" + amapLocation.getDistrict() + "" + amapLocation.getStreet() + "" + amapLocation.getStreetNum());

        //标题

        options.title(buffer.toString());

        //子标题

        options.snippet("这里好火");

        //设置多少帧刷新一次图片资源

        options.period(60);

        return options;

    }

    //激活定位

    @Override

    public void activate(OnLocationChangedListener listener) {

        mListener = listener;

    }

    //停止定位

    @Override

    public void deactivate() {

        mListener = null;

    }

    /**

     * 方法必须重写

     */

    @Override

    protected void onResume() {

        super.onResume();

        mapView.onResume();

    }

    /**

     * 方法必须重写

     */

    @Override

    protected void onPause() {

        super.onPause();

        mapView.onPause();

    }

    /**

     * 方法必须重写

     */

    @Override

    protected void onSaveInstanceState(Bundle outState) {

        super.onSaveInstanceState(outState);

        mapView.onSaveInstanceState(outState);

    }

    /**

     * 方法必须重写

     */

    @Override

    protected void onDestroy() {

        super.onDestroy();

        mapView.onDestroy();

    }

}