unchecked call to ArrayAdapter

问题

I get the following warning when I instantiate my ArrayAdapter (compiles fine):

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);

And here's the problem line:

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

Anyone have any ideas as to why it's giving me this warning?

回答1:

That's because ArrayAdapter expects you to specify which type of object it will manipulate. So, in order to avoid those warnings just do:

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

来源：https://stackoverflow.com/questions/4204706/unchecked-call-to-arrayadapter