假期学习记录8（高德地图实时显示运动路径）
实现地图的运动路径显示我使用的是marker，高德地图中每两秒会自动定位一次，然后记录上一次的经纬度根据当前经纬度来进行路径距离的判断，如果距离大于五米就显示一个marker，然后将记录的定位信息更新。
java代码如下
package com.example.lastgps; import android.graphics.BitmapFactory; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; 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 com.amap.api.maps.AMap; import com.amap.api.maps.AMapOptions; import com.amap.api.maps.AMapUtils; import com.amap.api.maps.CameraUpdateFactory; import com.amap.api.maps.MapView; import com.amap.api.maps.UiSettings; import com.amap.api.maps.model.BitmapDescriptor; import com.amap.api.maps.model.BitmapDescriptorFactory; import com.amap.api.maps.model.LatLng; import com.amap.api.maps.model.Marker; import com.amap.api.maps.model.MarkerOptions; import com.amap.api.maps.model.MyLocationStyle; import static com.amap.api.location.AMapLocationClientOption.AMapLocationMode.Hight_Accuracy; public class MainActivity extends AppCompatActivity { //声明AMapLocationClient类对象 public AMapLocationClient mLocationClient = null; //声明mLocationOption对象 public AMapLocationClientOption mLocationOption = null; private double lat; private double lon; private MapView mapView; private AMap aMap;//地图控制器对象 private UiSettings mUiSettings; private MyLocationStyle myLocationStyle; private Marker marker; LatLng mStartPoint = new LatLng(39.995576, 116.481288); private MarkerOptions markerOption; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); AMapLocationClient.setApiKey("eabd67533b005d65b84329c6eb00b053"); //初始化定位 mLocationClient = new AMapLocationClient(getApplicationContext()); //设置定位回调监听 mLocationClient.setLocationListener(mLocationListener);//设置其为定位完成后的回调函数 mapView = (MapView) findViewById(R.id.mymapview); mapView.onCreate(savedInstanceState); init(); myLocationStyle = new MyLocationStyle();//初始化定位蓝点样式类myLocationStyle.myLocationType(MyLocationStyle.LOCATION_TYPE_LOCATION_ROTATE);//连续定位、且将视角移动到地图中心点，定位点依照设备方向旋转，并且会跟随设备移动。（1秒1次定位）如果不设置myLocationType，默认也会执行此种模式。 myLocationStyle.myLocationType(MyLocationStyle.LOCATION_TYPE_MAP_ROTATE);//连续定位、且将视角移动到地图中心点，地图依照设备方向旋转，定位点会跟随设备移动。（1秒1次定位） myLocationStyle.interval(2000); //设置连续定位模式下的定位间隔，只在连续定位模式下生效，单次定位模式下不会生效。单位为毫秒。 aMap.setMyLocationStyle(myLocationStyle);//设置定位蓝点的Style aMap.getUiSettings().setMyLocationButtonEnabled(false);//设置默认定位按钮是否显示，非必需设置。 aMap.setMyLocationEnabled(true);// 设置为true表示启动显示定位蓝点，false表示隐藏定位蓝点并不进行定位，默认是false。 } /** * * 初始化AMap类对象 aMap 地图控制器 */ private void init() { if (aMap == null) { aMap = mapView.getMap();//地图控制器对象 mUiSettings = aMap.getUiSettings(); } //设置logo位置 mUiSettings.setLogoPosition(AMapOptions.LOGO_POSITION_BOTTOM_CENTER);//高德地图标志的摆放位置 mUiSettings.setZoomControlsEnabled(true);//地图缩放控件是否可见 mUiSettings.setZoomPosition(AMapOptions.ZOOM_POSITION_RIGHT_BUTTOM);//地图缩放控件的摆放位置 //aMap 为地图控制器对象 aMap.getUiSettings().setMyLocationButtonEnabled(false);//地图的定位标志是否可见 aMap.setMyLocationEnabled(true);//地图定位标志是否可以点击 setUpMap(); } /** * 配置定位参数 */ private void setUpMap() { //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(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(); } public AMapLocationListener mLocationListener = new AMapLocationListener() { @Override public void onLocationChanged(AMapLocation amapLocation) { if (amapLocation != null) { if (amapLocation.getErrorCode() == 0) { Log.v("getLocationType", ""+amapLocation.getLocationType() ) ; lat = amapLocation.getLatitude(); lon = amapLocation.getLongitude(); Log.v("getAccuracy", ""+amapLocation.getAccuracy()+" 米");//获取精度信息 Log.v("joe", "lat :-- " + lat + " lon :--" + lon); Log.v("joe", "Country : " + amapLocation.getCountry() + " province : " + amapLocation.getProvince() + " City : " + amapLocation.getCity() + " District : " + amapLocation.getDistrict()); //清空缓存位置 //aMap.clear(); LatLng mEndPoint = new LatLng(lat, lon); if (AMapUtils.calculateLineDistance(mStartPoint, mEndPoint)>5){ addMarkersToMap(mEndPoint); mStartPoint=mEndPoint; } // 设置显示的焦点，即当前地图显示为当前位置 aMap.moveCamera(CameraUpdateFactory.newLatLngZoom(new LatLng(lat, lon), 18)); //aMap.moveCamera(CameraUpdateFactory.zoomTo(18)); //aMap.moveCamera(CameraUpdateFactory.newLatLng(new LatLng(lat, lon))); MarkerOptions markerOptions = new MarkerOptions(); markerOptions.position(new LatLng(lat, lon)); // markerOptions.title("我的位置"); markerOptions.visible(false); // BitmapDescriptor bitmapDescriptor = BitmapDescriptorFactory.fromBitmap(BitmapFactory.decodeResource(getResources(), R.mipmap.people_set_place)); // markerOptions.icon(bitmapDescriptor); markerOptions.draggable(true); Marker marker = aMap.addMarker(markerOptions); marker.showInfoWindow(); } 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("joe", "location Error, ErrCode:" + amapLocation.getErrorCode() + ", errInfo:" + amapLocation.getErrorInfo()); } } } }; /** * 重新绘制加载地图 */ @Override protected void onResume() { super.onResume(); mapView.onResume(); } /** * 暂停地图的绘制 */ @Override protected void onPause() { super.onPause(); mapView.onPause(); } /** * 保存地图当前的状态方法必须重写 */ @Override protected void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); mapView.onSaveInstanceState(outState); } /** * 销毁地图 */ @Override protected void onDestroy() { super.onDestroy(); mapView.onDestroy(); if (mLocationClient != null) { mLocationClient.stopLocation(); mLocationClient.onDestroy(); } mLocationClient = null; } private void addMarkersToMap(LatLng latLng) { markerOption = new MarkerOptions().icon(BitmapDescriptorFactory.fromResource(R.drawable.amap_ride)) .position(latLng) .draggable(true); marker = aMap.addMarker(markerOption); } }
layout布局文件如下
<?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/activity_main" android:layout_width="match_parent" android:layout_height="match_parent" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context="com.example.lastgps.MainActivity"> <com.amap.api.maps.MapView android:id="@+id/mymapview" android:layout_width="match_parent" android:layout_height="match_parent"></com.amap.api.maps.MapView> </RelativeLayout>
运行结果如下
