android 运用百度地图画轨迹

package app.com;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.Point;
import android.graphics.Paint.Style;
import android.os.Bundle;

import com.baidu.mapapi.BMapManager;
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 AppActivity extends MapActivity {
    private BMapManager mBMapMan;
    private MapView mapView; private String mStrKey;
    private GeoPoint gPoint1,gPoint2,gPoint3;//连线的点
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
  mStrKey ="输入你的key值";         mBMapMan=new BMapManager(AppActivity.this);
        mBMapMan.init( mStrKey , null);         super.initMapActivity(mBMapMan);

        // 地图控件初始化
        mapView=(MapView)findViewById(R.id.bmapsView);
        mapView.setBuiltInZoomControls(true);
        mapView.setDrawOverlayWhenZooming(true);

        MyOverlay myOverlay=new MyOverlay();
        mapView.getOverlays().add(myOverlay);

        MapController mapController=mapView.getController();
        mapController.zoomIn();

        // 定义一个经纬度
        gPoint1 = new GeoPoint((int) (39.915*1E6),(int) (116.404*1E6));
        gPoint2 = new GeoPoint((int) (39.868935*1E6),(int) (116.39078*1E6));
        gPoint3 = new GeoPoint((int) (39.85963*1E6),(int) (116.44194*1E6));
        mapController.animateTo(gPoint1);

    }


    class MyOverlay extends Overlay
    {
   @Override
   public void draw(Canvas canvas, MapView mapView, boolean shadow) {
        // TODO Auto-generated method stub
        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.BLUE);
        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(4);

        //连线
        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);
   }
    }


    @Override
    protected boolean isRouteDisplayed() {
   // TODO Auto-generated method stub
   return false;
    }

    @Override
    protected void onDestroy() {
   if (mBMapMan!=null) {
        mBMapMan.destroy();
        mBMapMan=null;
   }
   super.onDestroy();
    }

    @Override
    protected void onPause() {
   if (mBMapMan!=null) {
        mBMapMan.stop();
   }
   super.onPause();
    }

    @Override
    protected void onResume() {
   if (mBMapMan!=null) {
        mBMapMan.start();
   }
   super.onResume();
    }
}

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