google map 定位当前位置和根据手机的方向调整在地图的方向

查遍整个 mapview 相关的文档没有找到与方向有关的方法
后惊觉有　MyLocationOverlay　类能实现了大部分功能
但图旋转始张无法解决

最后只能出绝招了　重载此类
最后实现了此功能　

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**
* 将google 地图的圆点变为带箭头的图标并随方向<a href="http://yidin.net/discuz/forum.php?mod=viewthread&tid=15&extra=page%3D1">转动</a>
* @author cola
*
*/

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.graphics.Matrix;
import android.graphics.Point;
import android.location.Location;
import com.google.android.maps.GeoPoint;
import com.google.android.maps.MapView;
import com.google.android.maps.MyLocationOverlay;

public class MyCustomLocationOverlay extends MyLocationOverlay {
private Context mContext;
private float mOrientation;
Bitmap arrowBitmap;//图片资源

public MyCustomLocationOverlay(Context context, MapView mapView,Bitmap res) {
super(context, mapView);
this.arrowBitmap = res;
mContext = context;
}

@<a href="http://yidin.net/discuz/forum.php?mod=viewthread&tid=15&extra=page%3D1">Override</a>
protected void drawMyLocation(Canvas canvas, MapView mapView,
Location lastFix, GeoPoint myLocation, long when) {
// translate the GeoPoint to screen pixels
Point screenPts = mapView.getProjection().toPixels(myLocation, null);

// create a rotated copy of the marker
//Bitmap arrowBitmap = BitmapFactory.decodeResource(
//mContext.getResources(), res);
Matrix matrix = new Matrix();
matrix.postRotate(mOrientation);
Bitmap rotatedBmp = Bitmap.createBitmap(arrowBitmap, 0, 0,
arrowBitmap.getWidth(), arrowBitmap.getHeight(), matrix, true);
// add the rotated marker to the canvas
canvas.drawBitmap(rotatedBmp,
screenPts.x - (rotatedBmp.getWidth() / 2), screenPts.y
- (rotatedBmp.getHeight() / 2), null);
}

public void setOrientation(float newOrientation) {
mOrientation = newOrientation;
}
}

原发贴地址：

google map 定位当前位置和根据手机的方向调整在地图的方向...
http://yidin.net/discuz/forum.php?mod=viewthread&tid=15&fromuid=1