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On this tutorial on the android devs about AutoCompleteTextView.
Would I need to create multiple instances of xml layout textview if I have multiple AutoCompleteTextView or would using one would be sufficient and place each on an ArrayAdapter
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, R.layout.list_item, COUNTRIES);
You just need one list_item XML file. You can re-use that layout for each of your AutoCompleteTextView instances/views. I believe you can even re-use the adapter if the list of auto-complete words are the same.