android 让某个UI 显示/隐藏
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参考:
http://stackoverflow.com/questions/4850238/how-to-make-ui-components-disappear-when-a-certain-radiobutton-is-selected代码:
if(numberPicker.getVisibility() == View.VISIBLE){
numberPicker.setVisibility(View.GONE);
}else{
numberPicker.setVisibility(View.VISIBLE);
}