我如何使用自定义位图的＆QUOT;您现在的位置：QUOT;在MyLocationOverlay点？ [英] How can I use a custom bitmap for the "you are here" point in a MyLocationOverlay?

问题描述

我已经浇过的文档，并没有能够想出解决办法。它甚至有可能？

I've poured over the docs and haven't been able to figure this out. Is it even possible?

请参阅本

推荐答案

它看起来像这样做的正确的机制是延长MyLocationOverlay然后覆盖drawMyLocation（）保护方法。

It looks like the correct mechanism to do this is to extend MyLocationOverlay then override the drawMyLocation() protected method.

下面使用一个箭头以显示这里的你是和这道你是指：

The following uses an arrow to show where "you" are and which way "you" are pointing:

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;
    }
}

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