java – 如何在MyLocationOverlay中为“你在这里”点使用自定义位图？

我已经倾倒了文档并且无法解决这个问题.它甚至可能吗？

Please see this

解决方法:

看起来正确的机制是扩展MyLocationOverlay然后覆盖drawMyLocation()受保护的方法.

以下使用箭头显示“你”的位置以及“你”指向的方式：

package com.example;

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;

    public MyCustomLocationOverlay(Context context, MapView mapView) {
        super(context, mapView);
        mContext = context;
    }

    @Override 
    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(), R.drawable.arrow_green);
        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;
    }
}