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AutoCompleteTextView autoCompleteTextView = findViewById(R.id.autoCompleteTextView);

String[] friends = {"Nick", "Rick", "Sara", "James", "Nina", "Noel", "Nire"};

ArrayAdapter<String> arrayAdapter = new ArrayAdapter<>(this, android.R.layout.simple_list_item_1, friends);

autoCompleteTextView.setAdapter(arrayAdapter);

autoCompleteTextView.setThreshold(1);