未经检查的对ArrayAdapter的调用

当我实例化我的ArrayAdapter(编译好)时,我得到以下警告

warning: [unchecked] unchecked call to ArrayAdapter(android.content.Context,int,java.util.List<T>) as a member of the raw type android.widget.ArrayAdapter ArrayAdapter spinnerArrayAdapter = new ArrayAdapter(CFAMain.this, android.R.layout.simple_spinner_dropdown_item, spinnerArray); 

这里是问题线:

 ArrayAdapter spinnerArrayAdapter = new ArrayAdapter(CFAMain.this, android.R.layout.simple_spinner_dropdown_item, spinnerArray); 

任何人有任何想法,为什么它给了我这个警告?

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