疊圖

Resources r = getResources();
Drawable[] layers = new Drawable[2];
layers[0] = r.getDrawable(R.drawable.map1);
layers[1] = r.getDrawable(R.drawable.user);
LayerDrawable layerDrawable = new LayerDrawable(layers);
imageView.setImageDrawable(layerDrawable);

/**
 * 疊圖
 * @param background 背景
 * @param foreground 前景
 * @param x 前景x位置
 * @param y 前景y位置
 * @return
 */
public static Bitmap combineBitmap(Bitmap background, Bitmap foreground, float x, float y) {
    if (background == null) return null;
    int bWidth = background.getWidth();
    int bHeight = background.getHeight();
    int fWidth = foreground.getWidth();
    int fHeight = foreground.getHeight();
    Bitmap newmap = Bitmap.createBitmap(bWidth, bHeight, Config.ARGB_8888);
    int unitX = bWidth/100;
    int unitY = bHeight/100;
    Canvas canvas = new Canvas(newmap);
    canvas.drawBitmap(background, 0, 0, null);
    canvas.drawBitmap(foreground, unitX * x -(fWidth/2), unitY * y-(fHeight/2), null);
    canvas.save(Canvas.ALL_SAVE_FLAG);
    canvas.restore();
    return newmap;
}