我怎么能代替MyLocationOverlay的罗盘形象？

问题描述

我想用我的形象来代替MyLocationOverlay的罗盘形象，我怎么能实现？

I want to use my image to replace the Compass image of MyLocationOverlay, how can i implement?

推荐答案

子类MyLocationOverlay，覆盖的方法drawCompass（画布油画，浮动轴承），并得出自己的位图（S）到画布对象：

Subclass MyLocationOverlay, override the method drawCompass(Canvas canvas, float bearing), and draw your own bitmap(s) onto the canvas object:

@Override
protected void drawCompass(Canvas canvas, float bearing) {

    Resources res = _context.getResources();
    Bitmap myCompassPointer = BitmapFactory.decodeResource(res, R.drawable.compass_pointer);

    float rotationAngle = -bearing + 360f;
    Matrix rotation = new Matrix();
    rotation.preRotate(rotationAngle, myCompassPointer.getWidth()/2.0f, myCompassPointer.getHeight()/2.0f);

    canvas.drawBitmap(myCompassPointer, rotation, null);

    // don't call super if you don't want the default compass image:
    //super.drawCompass(canvas, bearing);

}

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