public abstract void onItemSelected (AdapterView<?> arg0, View arg1, int arg2, long arg3)参数
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public abstract void onItemSelected (AdapterView<?> arg0, View arg1, int arg2, long arg3)
arg0 The AdapterView where the selection happened 解析:我们可以假单的看为下拉框(当我们为下拉框添加这个监听器时可以这么做),其他情况类似
arg1 The view within the AdapterView that was clicked 对应的就是ArrayAdapter构造函数中的第二个参数R.layout.list_item
arg2 The position of the view in the adapter 第一项position=0,第二项position=1...
arg3 The row id of the item that is selected
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