Bitmap图片旋转

[android]代码库

protected void onDraw(Canvas canvas){
        super.onDraw(canvas);

        //重置Matrix对象
        matrix.reset();

        //设置旋转
        matrix.setRotate(angle);

        //按matrix的旋转构造新的bitmap
        Bitmap bitmap2 = Bitmap.createBitmap(bitmap, 0, 0, bitmap.getWidth(), bitmap.getHeight(), matrix, true);

        //绘制旋转之后的图像
        canvas.drawBitmap(bitmap2,(320-bitmap.getWidth())/2,(430-bitmap.getHeight())/2, null);
}