GPS轨迹 跟踪路径

 

效果如上图

 

 

layout/main.xml

<?xml version="1.0" encoding="utf-8"?><LinearLayout android:id="@+id/widget0" android:layout_width="fill_parent" android:layout_height="fill_parent" android:background="@drawable/white" xmlns:android="http://schemas.android.com/apk/res/android"> <com.google.android.maps.MapView android:id="@+id/myMapView1" android:layout_width="fill_parent" android:layout_height="fill_parent" android:layout_x="0px" android:layout_y="82px" android:enabled="true" android:clickable="true" android:apiKey="0-6xYD0vU1u6OFOd5pue1lrB_kqXXrIQib3vQhw" /></LinearLayout>

 

 

package com.test.activity.util; import android.graphics.Canvas; import android.graphics.Color;import android.graphics.Paint; import android.graphics.Point; import android.graphics.RectF; import com.google.android.maps.GeoPoint; import com.google.android.maps.MapView; import com.google.android.maps.Overlay; import com.google.android.maps.Projection; public class MyOverLay extends Overlay { private GeoPoint gp1; private GeoPoint gp2; private int mRadius=6; private int mode=0; /* 建构子，传入起点与终点的GeoPoint与mode */ public MyOverLay(GeoPoint gp1,GeoPoint gp2,int mode) { this.gp1 = gp1; this.gp2 = gp2; this.mode = mode; } @Override public boolean draw (Canvas canvas, MapView mapView, boolean shadow, long when) { Projection projection = mapView.getProjection(); if (shadow == false) { /* 设定笔刷 */ Paint paint = new Paint(); paint.setAntiAlias(true); paint.setColor(Color.BLACK); Point point = new Point(); projection.toPixels(gp1, point); /* mode=1：建立起点 */ if(mode==1) { /* 定义RectF对象 */ RectF oval=new RectF(point.x - mRadius, point.y - mRadius, point.x + mRadius, point.y + mRadius); /* 绘制起点的圆形 */ canvas.drawOval(oval, paint); } /* mode=2：画路线 */ else if(mode==2) { Point point2 = new Point(); projection.toPixels(gp2, point2); paint.setStrokeWidth(5); paint.setAlpha(120); /* 画线 */ canvas.drawLine(point.x, point.y, point2.x,point2.y, paint); } /* mode=3：建立终点 */ else if(mode==3) { /* 避免误差，先画最后一段的路线 */ Point point2 = new Point(); projection.toPixels(gp2, point2); paint.setStrokeWidth(5); paint.setAlpha(120); canvas.drawLine(point.x, point.y, point2.x,point2.y, paint); /* 定义RectF对象 */ RectF oval=new RectF(point2.x - mRadius,point2.y - mRadius, point2.x + mRadius,point2.y + mRadius); /* 绘制终点的圆形 */ paint.setAlpha(255); canvas.drawOval(oval, paint); } } return super.draw(canvas, mapView, shadow, when); } }

 

package com.test.activity;import java.text.DecimalFormat;import java.text.NumberFormat;import java.util.List;import android.app.Activity;import android.app.AlertDialog;import android.content.Context;import android.content.DialogInterface;import android.os.Bundle;import android.view.View;import android.widget.Button;import android.widget.TextView;import android.location.Criteria;import android.location.Location;import android.location.LocationListener;import android.location.LocationManager;import com.google.android.maps.GeoPoint;import com.google.android.maps.MapActivity;import com.google.android.maps.MapController;import com.google.android.maps.MapView;import com.google.android.maps.Overlay;import com.test.activity.util.MyOverLay;public class MainActivity extends MapActivity {private MapView mMapView;private MapController mMapController;private LocationManager mLocationManager;private Location mLocation;private String mLocationPrivider = "";private int zoomLevel = 0;private GeoPoint gp1;private GeoPoint gp2;private boolean _run = false;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);/* 建立MapView对象 */mMapView = (MapView) findViewById(R.id.myMapView1);mMapController = mMapView.getController();mMapView.setBuiltInZoomControls(true);/* 设定预设的放大层级 */zoomLevel = 17;mMapController.setZoom(zoomLevel);/* Provider初始化 */mLocationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);/* 取得Provider与Location */getLocationPrivider();if (mLocation != null) {/* 取得目前的经纬度 */gp1 = getGeoByLocation(mLocation);gp2 = gp1;/* 将MapView的中点移至目前位置 */refreshMapView();/* 设定事件的Listener */mLocationManager.requestLocationUpdates(mLocationPrivider, 2000,10, mLocationListener);gp1 = gp2;/* 清除Overlay */resetOverlay();/* 画起点 */setStartPoint();/* 更新MapView */refreshMapView();/* 重设移动距离为0，并更新TextView *//* 启动画路线的机制 */_run = true;} else {new AlertDialog.Builder(MainActivity.this).setTitle("系统讯息").setMessage(getResources().getString(R.string.app_name)).setNegativeButton("确定",new DialogInterface.OnClickListener() {public void onClick(DialogInterface dialog,int which) {MainActivity.this.finish();}}).show();}}@Overrideprotected void onDestroy() {// TODO Auto-generated method stubsuper.onDestroy();/* 画终点 */setEndPoint();/* 更新MapView */refreshMapView();/* 终止画路线的机制 */_run = false;}/* MapView的Listener */public final LocationListener mLocationListener = new LocationListener() {@Overridepublic void onLocationChanged(Location location) {/* 如果记录进行中，就画路线并更新移动距离 */if (_run) {/* 记下移动后的位置 */gp2 = getGeoByLocation(location);/* 画路线 */setRoute();/* 更新MapView */refreshMapView();/* 取得移动距离 */gp1 = gp2;}}@Overridepublic void onProviderDisabled(String provider) {}@Overridepublic void onProviderEnabled(String provider) {}@Overridepublic void onStatusChanged(String provider, int status, Bundle extras) {}};/* 取得GeoPoint的method */private GeoPoint getGeoByLocation(Location location) {GeoPoint gp = null;try {if (location != null) {double geoLatitude = location.getLatitude() * 1E6;double geoLongitude = location.getLongitude() * 1E6;gp = new GeoPoint((int) geoLatitude, (int) geoLongitude);}} catch (Exception e) {e.printStackTrace();}return gp;}/* 取得LocationProvider */public void getLocationPrivider() {Criteria mCriteria = new Criteria();mCriteria.setAccuracy(Criteria.ACCURACY_COARSE);mCriteria.setAltitudeRequired(false);mCriteria.setBearingRequired(false);mCriteria.setCostAllowed(true);mCriteria.setPowerRequirement(Criteria.POWER_LOW);mLocationPrivider = mLocationManager.getBestProvider(mCriteria, true);mLocation = mLocationManager.getLastKnownLocation(mLocationPrivider);}/* 设定起点的method */private void setStartPoint() {int mode = 1;MyOverLay mOverlay = new MyOverLay(gp1, gp2, mode);List<Overlay> overlays = mMapView.getOverlays();overlays.add(mOverlay);}/* 设定路线的method */private void setRoute() {int mode = 2;MyOverLay mOverlay = new MyOverLay(gp1, gp2, mode);List<Overlay> overlays = mMapView.getOverlays();overlays.add(mOverlay);}/* 设定终点的method */private void setEndPoint() {int mode = 3;MyOverLay mOverlay = new MyOverLay(gp1, gp2, mode);List<Overlay> overlays = mMapView.getOverlays();overlays.add(mOverlay);}/* 重设Overlay的method */private void resetOverlay() {List<Overlay> overlays = mMapView.getOverlays();overlays.clear();}/* 更新MapView的method */public void refreshMapView() {mMapView.displayZoomControls(true);MapController myMC = mMapView.getController();myMC.animateTo(gp2);myMC.setZoom(zoomLevel);mMapView.setSatellite(false);}/* format移动距离的method */public String format(double num) {NumberFormat formatter = new DecimalFormat("###");String s = formatter.format(num);return s;}@Overrideprotected boolean isRouteDisplayed() {return false;}}

 

在application 加上

 <application
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
        <uses-library android:name="com.google.android.maps" />

 </application>

 <uses-permission android:name="android.permission.INTERNET"/>

 

 android:apiKey="0-6xYD0vU1u6OFOd5pue1lrB_kqXXrIQib3vQhw" 换成自己的 

  运行不起来的    请留言