how to have first item selected by default in listview with radio buttons in android?

Question

I have a listview with radio buttons displaying some items in my android app. I want to have first option selected by default in this listview. Thanks in advance.

Answer 1

当列表视图创建的数组索引为零时，应检查true属性设置，然后您将获得将在列表视图中选择的第一个单选框。

Answer 2

When you override getView() in your adapter, you could use the position in order to check the first item in your ListView.

RadioButton item;
if (null == view) {
    //add code for new view
}
else {
    item = (RadioButton) view;
    if (position == 0) {
        item.setChecked(true);
    }
    else {
        item.setChecked(false);
    }
}

This is what I was using as a resource: https://developer.android.com/reference/android/widget/Adapter.html