通过单击按钮取消选中所有复选框

I'm currently making an app with a lot of checkboxes (39 to be spcific) and I want to implement a button that will uncheck them when it's clicked. I haven't done much with buttons (I only used them to start a new activity so far) so I'm still not completely sure how they work. After doing some research this is what I came up with. Even though I have 39 checkboxes I will only paste a few in this code to keep it short.I'm currently making an app with a lot of check