还是可以优化的 对于一些大图说明会有空格 之后优化
1.使用

/**
 * initGuide
 */
private void initGuide() {
    showtips = new ShowTipsBuilder(MainActivity.this)
            .setTarget(findViewById(R.id.tv_main1))
            .setBitmapRes(R.drawable.guidance_img_dier)//?????????????
            .setDescriptionBitmapRes(R.drawable.guidance_img_dieri_shuoming)//???y????????
            .setDelay(800)
            .build();
    showtips.setId(R.id.guide1);
    showtips.show(MainActivity.this);
    showtipsType = showtips;
    showtips.setOnClickListener(this);
}

2.代码

@SuppressLint("DrawAllocation")
@Override
protected void onDraw(Canvas canvas) {
	super.onDraw(canvas);

	/*
	 * Draw circle and transparency background
	 */

	Bitmap bitmap = Bitmap.createBitmap(canvas.getWidth(), canvas.getHeight(), Bitmap.Config.ARGB_8888);
	Canvas temp = new Canvas(bitmap);
	Paint paint = new Paint();
	if (background_color != 0)
		paint.setColor(background_color);
	else
		paint.setColor(Color.parseColor("#000000"));
	paint.setAlpha(204);
	temp.drawRect(0, 0, temp.getWidth(), temp.getHeight(), paint);
	
	 
	Bitmap bitmap2 = BitmapFactory.decodeResource(getResources(), getBitmapRes()).copy(Bitmap.Config.ARGB_8888, true);


	Paint transparentPaint = new Paint();
	transparentPaint.setColor(getResources().getColor(android.R.color.transparent));
	transparentPaint.setXfermode(new PorterDuffXfermode(PorterDuff.Mode.DST_IN));

	int x = showhintPoints.x;
	int y = showhintPoints.y;
	temp.drawBitmap(bitmap2, x-bitmap2.getWidth()/2, y-bitmap2.getHeight()/2, transparentPaint);
	temp.drawBitmap(bitmap2, x-bitmap2.getWidth()/2, y-bitmap2.getHeight()/2, new Paint());

	canvas.drawBitmap(bitmap, 0, 0, new Paint());

}

3.效果