百度android地图例子里的LocationOverlay，怎么改变圈的大小

[penguin1047]

那个例子有个蓝色的圆圈，不知怎么改变大小，比如改成200米的半径

package com.baidu.mapapi.demo;

import java.util.ArrayList;
import java.util.List;

import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Point;
import android.graphics.drawable.Drawable;
import android.location.Location;
import android.os.Bundle;
import android.view.View;
import android.view.ViewGroup.LayoutParams;
import android.widget.Toast;

import com.baidu.mapapi.BMapManager;
import com.baidu.mapapi.GeoPoint;
import com.baidu.mapapi.ItemizedOverlay;
import com.baidu.mapapi.LocationListener;
import com.baidu.mapapi.MapActivity;
import com.baidu.mapapi.MapView;
import com.baidu.mapapi.MyLocationOverlay;
import com.baidu.mapapi.OverlayItem;
import com.baidu.mapapi.Projection;

public class LocationOverlay extends MapActivity {
	static View mPopView = null;	// 点击mark时弹出的气泡View
	MapView mMapView = null;
	LocationListener mLocationListener = null;//onResume时注册此listener，onPause时需要Remove
	MyLocationOverlay mLocationOverlay = null;	//定位图层
	
	protected void onCreate(Bundle savedInstanceState) {
		
		super.onCreate(savedInstanceState);
        setContentView(R.layout.mapviewdemo);
        
		BMapApiDemoApp app = (BMapApiDemoApp)this.getApplication();
		if (app.mBMapMan == null) {
			app.mBMapMan = new BMapManager(getApplication());
			app.mBMapMan.init(app.mStrKey, new BMapApiDemoApp.MyGeneralListener());
		}
		app.mBMapMan.start();
        // 如果使用地图SDK，请初始化地图Activity
        super.initMapActivity(app.mBMapMan);
        
        mMapView = (MapView)findViewById(R.id.bmapView);
        mMapView.setBuiltInZoomControls(true);
        //设置在缩放动画过程中也显示overlay,默认为不绘制
        mMapView.setDrawOverlayWhenZooming(true);
        
		// 添加定位图层
        mLocationOverlay = new MyLocationOverlay(this, mMapView);
		mMapView.getOverlays().add(mLocationOverlay);
		
        // 注册定位事件
        mLocationListener = new LocationListener(){

			
			public void onLocationChanged(Location location) {
				if (location != null){
					GeoPoint pt = new GeoPoint((int)(location.getLatitude()*1e6),
							(int)(location.getLongitude()*1e6));
					mMapView.getController().animateTo(pt);
				}
			}
        };
	}

	
	protected void onPause() {
		BMapApiDemoApp app = (BMapApiDemoApp)this.getApplication();
		app.mBMapMan.getLocationManager().removeUpdates(mLocationListener);
		mLocationOverlay.disableMyLocation();
        mLocationOverlay.disableCompass(); // 关闭指南针
		app.mBMapMan.stop();
		super.onPause();
	}
	@Override
	protected void onResume() {
		BMapApiDemoApp app = (BMapApiDemoApp)this.getApplication();
		// 注册定位事件，定位后将地图移动到定位点
        app.mBMapMan.getLocationManager().requestLocationUpdates(mLocationListener);
        mLocationOverlay.enableMyLocation();
        mLocationOverlay.enableCompass(); // 打开指南针
		app.mBMapMan.start();
		super.onResume();
	}

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

}

[j_f0001]

那个是坐标的精度，需要动态调整的。
如果真要动态调整的话，是在图层的draw里面画的

[梦_枫]

那个好像没法改,,它的大小和你当前地图缩放大小成比例的

[penguin1047]

如果我要在当前手机所在位置画个半径200米的圆圈怎么画？能否提供代码？

[tangfei_honesty]

[Quote=引用 3 楼 penguin1047 的回复:]

如果我要在当前手机所在位置画个半径200米的圆圈怎么画？能否提供代码？
[/Quote]
百度的例子好像写死了
画圆
public void draw(Canvas canvas, MapView mapView, boolean shadow) {
super.draw(canvas, mapView, shadow);
Paint paint = new Paint();
paint.setColor(Color.BLUE);
paint.setDither(true);
paint.setStyle(Paint.Style.STROKE);
paint.setStrokeCap(Paint.Cap.ROUND);
paint.setStrokeJoin(Paint.Join.ROUND);
paint.setStrokeWidth(5);
Projection projection = mapView.getProjection();
Point p1 = new Point();
projection.toPixels(getPoint, p1);
canvas.drawCircle(p1.x, p1.y, projection.metersToEquatorPixels(Radius), paint);
}