高德地图——地图图层

关于申请key等，请参考加载一张简单的高德地图

地图是由多个图层组成，每个图层会显示一部分的地理或交通信息。开发
者可以通过设置 AMap 类，灵活控制图层的显示状态。例如，用户所看到包括
街道、兴趣点、学校、公园等内容的地图展现就是一个图层。实时路况等的展
现也是通过图层来实现的。首先介绍一下比较常用的四种图层：
• 基本地图。
• 自定义图层(这里不做讲解)。
• 实时路况。
• 定位层。

基础地图

3D地图SDK提供三种地图类型：
1.MAP_TYPE_NORMAL
标准地图。地图包含道路、建筑等。

2. MAP_TYPE_SATELLITE
卫星地图。

3. MAP_TYPE_NIGHT
夜景地图（仅3D地图）

AMap是地图的控制类，设置基础地图的类型只需要

AMap aMap=mapView.getMap();aMap.setMapType(AMap.MAP_TYPE_NORMAL);

实时路况

AMap  aMap=mapView.getMap();aMap.setTrafficEnabled(true);

定位层

这里涉及到定位需要从高德官网下载定位的相关jar包，这里使用
AMap_Location_V2.5.0_20160526.jar
这个有些繁琐，但都是固定的模板


// 设置激活/关闭定位的监听aMap.setLocationSource(this);
//在地图上标注我的位置aMap.getUiSettings().setMyLocationButtonEnabled(true);
// 设置为true表示显示定位层并可触发定位,false表示隐藏定位层并不可触发定位，默认是false
aMap.setMyLocationEnabled(true);
//设置当前位置跟随模式
//参数:
//type - style 总共有三种模式，定位，跟随和旋转(这里为跟随)
aMap.setMyLocationType(AMap.LOCATION_TYPE_MAP_FOLLOW);

LocationSource 方法如下：

public interface LocationSource {
//激活定位void activate(LocationSource.OnLocationChangedListener var1);
//取消定位void deactivate();public interface OnLocationChangedListener {void onLocationChanged(Location var1);}
}

激活定位，但定位逻辑是由——AMapLocationClient来进行的

  @Overridepublic void activate(OnLocationChangedListener onLocationChangedListener) {this.mListener = onLocationChangedListener;if (aMapLocationClient == null) {aMapLocationClient = new AMapLocationClient(this);aMapLocationClientOption = new AMapLocationClientOption();//设置定位回调，处理位置改变   aMapLocationClient.setLocationListener(this);
//设置定位模式，推荐使用高精度定位aMapLocationClientOption.setLocationMode(AMapLocationClientOption.AMapLocationMode.Hight_Accuracy);
//设置aMapLocationClient的定位Option
aMapLocationClient.setLocationOption(aMapLocationClientOption);
//开启定位
aMapLocationClient.startLocation();}

在AMapLocationListener .onLocationChanged()中处理位置改变

public interface AMapLocationListener {void onLocationChanged(AMapLocation var1);
}

 @Overridepublic void onLocationChanged(AMapLocation aMapLocation) {if (mListener != null && aMapLocation != null) {if (aMapLocation.getErrorCode() == 0) {//这里高德地图进行了高度封装，直接就显示系统小蓝点mListener.onLocationChanged(aMapLocation);} else {String errText = "定位失败," + aMapLocation.getErrorCode() + ": "+ aMapLocation.getErrorInfo();Log.e("AmapErr", errText);}}}

注意：获取手机位置属于危险权限，需要进行申请，不熟悉的同学请参考
Android6.0权限申请模型

完整代码如下：

package com.hang.hellomapdemo;import android.Manifest;
import android.annotation.TargetApi;
import android.content.pm.PackageManager;
import android.os.Bundle;
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;public class SimpleLocationActivity extends AppCompatActivity implements LocationSource, AMapLocationListener {MapView mapView;AMap aMap;OnLocationChangedListener mListener;AMapLocationClient aMapLocationClient;AMapLocationClientOption aMapLocationClientOption;final int REQUEST_PERMISSION_LOCATION = 10;@TargetApi(23)public void applyPermission() {ActivityCompat.requestPermissions(SimpleLocationActivity.this,new String[]{Manifest.permission.ACCESS_FINE_LOCATION},REQUEST_PERMISSION_LOCATION);}@TargetApi(23)@Overridepublic void onRequestPermissionsResult(int requestCode,String[] permissions, int[] grantResults) {switch (requestCode) {case REQUEST_PERMISSION_LOCATION: {if (grantResults.length > 0&& grantResults[0] == PackageManager.PERMISSION_GRANTED) {aMap.setLocationSource(this);//在地图上标注我的位置aMap.getUiSettings().setMyLocationButtonEnabled(true);// 设置为true表示显示定位层并可触发定位,false表示隐藏定位层并不可触发定位，默认是falseaMap.setMyLocationEnabled(true);//设置定位类型  AMap.LOCATION_TYPE_MAP_FOLLOW:追踪定位aMap.setMyLocationType(AMap.LOCATION_TYPE_MAP_FOLLOW);} else {Toast.makeText(SimpleLocationActivity.this, "没有获取权限，无法完成定位~", Toast.LENGTH_LONG).show();}}break;default:break;}super.onRequestPermissionsResult(requestCode, permissions, grantResults);}@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);mapView = new MapView(this);aMap = mapView.getMap();setContentView(mapView);mapView.onCreate(savedInstanceState);applyPermission();}@Overrideprotected void onResume() {super.onResume();mapView.onResume();}@Overrideprotected void onPause() {super.onPause();mapView.onPause();}@Overrideprotected void onDestroy() {super.onDestroy();mapView.onDestroy();}@Overridepublic void onSaveInstanceState(Bundle outState) {super.onSaveInstanceState(outState);mapView.onSaveInstanceState(outState);}@Overridepublic void activate(OnLocationChangedListener onLocationChangedListener) {this.mListener = onLocationChangedListener;if (aMapLocationClient == null) {aMapLocationClient = new AMapLocationClient(this);aMapLocationClientOption = new AMapLocationClientOption();aMapLocationClient.setLocationListener(this);aMapLocationClientOption.setLocationMode(AMapLocationClientOption.AMapLocationMode.Hight_Accuracy);aMapLocationClient.setLocationOption(aMapLocationClientOption);aMapLocationClient.startLocation();}}@Overridepublic void deactivate() {mListener = null;if (aMapLocationClient != null) {aMapLocationClient.stopLocation();aMapLocationClient.onDestroy();}}@Overridepublic void onLocationChanged(AMapLocation aMapLocation) {if (mListener != null && aMapLocation != null) {if (aMapLocation.getErrorCode() == 0) {mListener.onLocationChanged(aMapLocation);// 显示系统小蓝点} else {String errText = "定位失败," + aMapLocation.getErrorCode() + ": "+ aMapLocation.getErrorInfo();Log.e("AmapErr", errText);}}}}