跟我学在高德地图——标注我的位置

2022-08-25 21:21:48 浏览数 (1)

大家好，又见面了，我是你们的朋友全栈君。

这里使用的SDK为AMap_Location_V2.5.0_20160526.jar 没有接触过高德地图的同学，请参考 加载一张高德地图

1.获取我的位置

代码语言：javascript复制
package com.pansoft.oilgas.gaodenavigation;

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;

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 java.text.SimpleDateFormat;
import java.util.Date;

public class QueryCurrentLocationActivity extends AppCompatActivity implements AMapLocationListener { 
   
    private AMapLocationClientOption mLocationOption = null;
    private AMapLocationClient mLocationClient = null;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mLocationClient = new AMapLocationClient(this);
//初始化定位参数
        mLocationOption = new AMapLocationClientOption();
//设置定位监听
        mLocationClient.setLocationListener(this);
/*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);
//设置定位间隔,单位毫秒,默认为2000ms
        mLocationOption.setInterval(2000);
//设置定位参数
mLocationClient.setLocationOption(mLocationOption);
/* 此方法为每隔固定时间会发起一次定位请求，为了减少电量消耗或网络流量消耗，注意设置合适的定位时间的间隔（最小间隔支持为2000ms），并且在合适时间调用stopLocation()方法来取消定位请求，在定位结束后，在合适的生命周期调用onDestroy()方法 在单次定位情况下，定位无论成功与否，都无需调用stopLocation()方法移除请求，定位sdk内部会移除启动定位*/
        mLocationClient.startLocation();

    }

    @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
            } 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());
            }
        }
    }


}

ok，执行以下！

不好了，缺少定位权限，是没有在AndroidManifest文件中声明定位权限吗？不是，是Android6.0中将用户权限分为普通权限和危险权限，这里定位权限属于危险权限，需要在使用的时候进行动态申请。 对Android6定位权限不熟悉的同学请参考

Android6.0权限申请模型

2.动态申请定位权限

代码语言：javascript复制
   public void requestLocationPermission(){
        ActivityCompat.requestPermissions(this,new String[]{android.Manifest.permission.ACCESS_FINE_LOCATION},REQ_LOCATION);
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        if(requestCode==REQ_LOCATION){
            if(grantResults!=null&&grantResults.length>0){
                if(grantResults[0]== PackageManager.PERMISSION_GRANTED){
                    mLocationClient.startLocation();
                }else{
                    Toast.makeText(QueryCurrentLocationActivity.this,"缺少定位权限，无法完成定位~",Toast.LENGTH_LONG).show();
                }
            }
        }
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    }

3.展示获取到的位置数据

定义一个DialogFragment展示数据，不熟悉DialogFragment的同学请参考 AltertDialog在DialogFragment中的使用

代码语言：javascript复制
package com.pansoft.oilgas.gaodenavigation;

import android.app.AlertDialog;
import android.app.Dialog;
import android.app.DialogFragment;
import android.content.DialogInterface;
import android.os.Bundle;

import com.amap.api.location.AMapLocation;


public class ShowLocationFragment extends DialogFragment { 
   
    public static final String KEY_MSG = "location msg";
    private AMapLocation currentLocation;
    public ShowLocationFragment() {
        // Required empty public constructor
    }

    public static ShowLocationFragment newInstance(AMapLocation currentLocation) {
        ShowLocationFragment fragment = new ShowLocationFragment();
        Bundle args = new Bundle();
        args.putParcelable(KEY_MSG,currentLocation);
        fragment.setArguments(args);
        return fragment;
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (getArguments() != null) {
            currentLocation =getArguments().getParcelable(KEY_MSG);
        }
    }

    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        AlertDialog.Builder builder=new AlertDialog.Builder(getActivity());

        builder.setTitle("当前位置信息");
        builder.setMessage(currentLocation.getCity() "n"
         currentLocation.getAddress() "n"
         "当前经纬度: " currentLocation.getLatitude() "," currentLocation.getLongitude() "n"
        );
        builder.setPositiveButton("知道了", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialogInterface, int i) {
                dialogInterface.dismiss();
            }
        });
     return builder.create();
    }
}

在onLocationChange成功获取数据后，调用

代码语言：javascript复制
     ShowLocationFragment showFragment=ShowLocationFragment.newInstance(amapLocation);
               showFragment.show(getFragmentManager(),"xxxx");

展示数据

ok，初见成效！

4.在地图上标注我的位置

在原来代码的基础上，添加地图MapView 不熟悉的同学，请参考 加载一张高德地图

在onCreate中添加，获取我的位置的相关部分

代码语言：javascript复制
   // show my location
        aMap.setLocationSource(this);
        aMap.getUiSettings().setMyLocationButtonEnabled(true);
        aMap.setMyLocationEnabled(true);
        aMap.setMyLocationType(AMap.LOCATION_TYPE_MAP_FOLLOW);

在QueryCurrentLocationActivity 中实现LocationSource接口

代码语言：javascript复制
  @Override
    public void activate(OnLocationChangedListener onLocationChangedListener) {
        this.onLocationChangedListener=onLocationChangedListener;

    }
  @Override
    public void deactivate() {
        if(mLocationClient!=null){
            mLocationClient.stopLocation();
            mLocationClient.onDestroy();
        }
    }

在定位成功后——onLocationChanged内刷新位置

代码语言：javascript复制
    if(onLocationChangedListener!=null){
                    onLocationChangedListener.onLocationChanged(amapLocation);
                }

ok!

5.完整代码

代码语言：javascript复制
package com.pansoft.oilgas.gaodenavigation;

import android.content.pm.PackageManager;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v4.app.ActivityCompat;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.widget.Toast;

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.LocationSource;
import com.amap.api.maps.MapView;

import java.text.SimpleDateFormat;
import java.util.Date;

public class QueryCurrentLocationActivity extends AppCompatActivity implements AMapLocationListener,LocationSource { 
   
    private AMapLocationClientOption mLocationOption = null;
    private AMapLocationClient mLocationClient = null;
    private final int REQ_LOCATION=0x12;
    private MapView mapView;
    private AMap aMap;
    private OnLocationChangedListener onLocationChangedListener;
    @Override
    public void activate(OnLocationChangedListener onLocationChangedListener) {
        this.onLocationChangedListener=onLocationChangedListener;
    }
    @Override
    public void deactivate() {
        if(mLocationClient!=null){
            mLocationClient.stopLocation();
            mLocationClient.onDestroy();
        }
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mapView=new MapView(this);
        setContentView(mapView);
        aMap=mapView.getMap();
        mapView.onCreate(savedInstanceState);

        mLocationClient = new AMapLocationClient(this);
//初始化定位参数
        mLocationOption = new AMapLocationClientOption();
//设置定位监听
        mLocationClient.setLocationListener(this);
//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);
//设置定位间隔,单位毫秒,默认为2000ms
        mLocationOption.setInterval(2000);
//设置定位参数
        mLocationClient.setLocationOption(mLocationOption);
/* 此方法为每隔固定时间会发起一次定位请求，为了减少电量消耗或网络流量消耗， 注意设置合适的定位时间的间隔（最小间隔支持为2000ms），并且在合适时间调用stopLocation()方法来取消定位请求 在定位结束后，在合适的生命周期调用onDestroy()方法 在单次定位情况下，定位无论成功与否，都无需调用stopLocation()方法移除请求，定位sdk内部会移除 启动定位*/

        requestLocationPermission();
    }
    public void requestLocationPermission(){
        ActivityCompat.requestPermissions(this,new String[]{android.Manifest.permission.ACCESS_FINE_LOCATION},REQ_LOCATION);
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        if(requestCode==REQ_LOCATION){
            if(grantResults!=null&&grantResults.length>0){
                if(grantResults[0]== PackageManager.PERMISSION_GRANTED){
                   mLocationClient.startLocation();


                }else{
                    Toast.makeText(QueryCurrentLocationActivity.this,"缺少定位权限，无法完成定位~",Toast.LENGTH_LONG).show();
                }
            }
        }
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
    }

    @Override
    public void onLocationChanged(AMapLocation amapLocation) {
        if (amapLocation != null) {
            if (amapLocation.getErrorCode() == 0) {
                if(onLocationChangedListener!=null){
                    onLocationChangedListener.onLocationChanged(amapLocation);
                }
            } 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());
            }
        }
    }
    @Override
    protected void onResume() {
        super.onResume();
        mapView.onResume();
    }

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

    @Override
    protected void onDestroy() {
        super.onDestroy();
        mapView.onDestroy();
    }

    @Override
    public void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        mapView.onSaveInstanceState(outState);
        if(mLocationClient!=null){
            mLocationClient.stopLocation();
            mLocationClient.onDestroy();
        }
    }
}

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