Create an array of String or get it from any function and create an ArrayAdapter of String then let the adapter to set the list for you .
String[] array={"first","second item" ,"third item"};
AutoCompleteTextView textView;
ArrayAdapter<String> adapter;
textView = (AutoCompleteTextView) findViewById(R.id.et_search);
adapter = new ArrayAdapter<String>(PlayListActivity.this,
android.R.layout.simple_list_item_1, array);
textView.setAdapter(adapter);
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