百度地图 实现行走轨迹描绘（觉得网上好多缺点，不全，自己写了一个）

<?xml version="1.0" encoding="UTF-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >
 
    <com.baidu.mapapi.MapView
        android:id="@+id/bmapsView1"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:clickable="true" />
    
    </LinearLayout>

package com.xmb.navigationdemoactivity;

import android.content.Context;

import android.graphics.Canvas;

import android.graphics.Color;

import android.graphics.Paint;

import android.graphics.Paint.Style;

import android.graphics.Path;

import android.graphics.Point;

import android.os.Bundle;
import android.util.Log;
import android.widget.Toast;

import com.baidu.mapapi.BMapManager;
import com.baidu.mapapi.MKEvent;
import com.baidu.mapapi.MKGeneralListener;

import com.baidu.mapapi.GeoPoint;

import com.baidu.mapapi.MapActivity;

import com.baidu.mapapi.MapController;

import com.baidu.mapapi.MapView;

import com.baidu.mapapi.Overlay;

import com.baidu.mapapi.Projection;



public class LineTest extends MapActivity {

        private Context mContext;

        private MapView mapView;
        private BMapManager mMapManager = null;
        private double mLat1 = 23.178848; // point1纬度
        private double mLon1 = 113.418792; // point1经度

        private double mLat2 = 23.078848;
        private double mLon2 = 113.418792;

        private double mLat3 = 23.178848;
        private double mLon3 = 113.018792;
        @Override

        protected boolean isRouteDisplayed() {

                // TODO Auto-generated method stub

                return false;

        }

        private GeoPoint gpoint1, gpoint2, gpoint3;// 连线的点

        @Override

        protected void onCreate(Bundle arg0) {

                super.onCreate(arg0);

                setContentView(R.layout.line);
                mMapManager = new BMapManager(getApplication());
                mMapManager.init("C9DF0F24E9FFCCEB4AF1DA296E8A694B311A3073", new MyGeneralListener());
                
                super.initMapActivity(mMapManager);


/*                BaseApplication baseApp = (BaseApplication) this.getApplication();

                if (baseApp.mMapManagerage == null) {

                        baseApp.mMapManagerage = new BMapManager(mContext);

                        baseApp.mMapManagerage.init(baseApp.mStrKey,

                                        new BaseApplication.MyGeneralListener());

                }

                baseApp.mMapManagerage.start();

                super.initMapActivity(baseApp.mMapManagerage);// 初始化map sdk

 */               mapView = (MapView) findViewById(R.id.bmapsView1);

                mapView.setBuiltInZoomControls(true);

                // 设置在缩放动画过程中也显示overlay,默认为不绘制

                mapView.setDrawOverlayWhenZooming(true);



                // RouteLine routeLine =

                // (RouteLine)getIntent().getSerializableExtra("routeLine");
                gpoint1 = new GeoPoint((int) (mLat1 * 1E6), (int) (mLon1 * 1E6));

                gpoint2 = new GeoPoint((int) (mLat2 * 1E6), (int) (mLon2 * 1E6));

                gpoint3 = new GeoPoint((int) (mLat3 * 1E6), (int) (mLon3 * 1E6)); 
                MapController mapController = mapView.getController();
                //mapController.animateTo(gpoint1);//设置一个起点
                //这里画点和连接线
                mapController.setCenter(gpoint1);
                MyOverlay myOverlay = new MyOverlay();

                mapView.getOverlays().add(myOverlay);

                

                

                mapController.zoomIn();

                

                               

                

        }


     // 常用事件监听，用来处理通常的网络错误，授权验证错误等
        class MyGeneralListener implements MKGeneralListener {
                @Override
                public void onGetNetworkState(int iError) {
                    Log.d("MyGeneralListener", "onGetNetworkState error is "+ iError);
                    Toast.makeText(LineTest.this, "您的网络出错啦！",
                            Toast.LENGTH_LONG).show();
                }

                @Override
                public void onGetPermissionState(int iError) {
                    Log.d("MyGeneralListener", "onGetPermissionState error is "+ iError);
                    if (iError ==  MKEvent.ERROR_PERMISSION_DENIED) {
                        // 授权Key错误：
                        Toast.makeText(LineTest.this, 
                                "请在BMapApiDemoApp.java文件输入正确的授权Key！",
                                Toast.LENGTH_LONG).show();
                    }
                }
            }
        
        
        
        @Override
        protected void onDestroy() {
            // TODO Auto-generated method stub
             if (mMapManager != null) {            
                 mMapManager.destroy();            
                 mMapManager = null;        
                 }
            super.onDestroy();
        }



        @Override
        protected void onPause() {
            // TODO Auto-generated method stub
            if (mMapManager != null) {            
                mMapManager.stop();        
                }
            super.onPause();
        }



        @Override
        protected void onResume() {
            // TODO Auto-generated method stub
             if (mMapManager != null) {            
                 mMapManager.start();        
                 }
            super.onResume();
        }


        class MyOverlay extends Overlay {



                @Override

                public void draw(Canvas canvas, MapView mapView, boolean shadow) {

                        super.draw(canvas, mapView, shadow);

                        

                        Projection projection = mapView.getProjection();

                        Point p1 = new Point();

                        Point p2 = new Point();

                        Point p3 = new Point();

                        // 经度转像素

                        projection.toPixels(gpoint1, p1);

                        projection.toPixels(gpoint2, p2);

                        projection.toPixels(gpoint3, p3);

                

                        //第一个画笔 画圆

                        Paint fillPaint = new Paint();

                        fillPaint.setColor(Color.GREEN);

                        fillPaint.setAntiAlias(true);

                        fillPaint.setStyle(Style.FILL);

                        

                        // 将图画到上层

                        canvas.drawCircle(p1.x, p1.y, 5.0f, fillPaint);

                        canvas.drawCircle(p2.x, p2.y, 5.0f, fillPaint);

                        canvas.drawCircle(p3.x, p3.y, 5.0f, fillPaint);



                        //第二个画笔 画线

                        Paint paint = new Paint();

                        paint.setColor(Color.BLUE);

                        paint.setDither(true);

                        paint.setStyle(Paint.Style.STROKE);

                        paint.setStrokeJoin(Paint.Join.ROUND);

                        paint.setStrokeCap(Paint.Cap.ROUND);

                        paint.setStrokeWidth(8);



                        //连接

                        Path path = new Path();

                        path.moveTo(p1.x, p1.y);

                        path.lineTo(p2.x, p2.y);

                        path.lineTo(p3.x, p3.y);

                        //画出路径

                        canvas.drawPath(path, paint);

                }

        }



}