Difference between MultiAutoCompleteTextView and AutoCompleteTextView

AutocompleteTextView only offers suggestions about the whole sentence and MultiAutoCompleteTextView offers suggestions for every token in the sentence. You can specify what is the delimiter between tokens.

String[] words=new String[] {
     "word1", "word2", "word3", "word4", "word5"
 };

MultiAutoCompleteTextView macTv = (MultiAutoCompleteTextView) this.findViewById(R.id.mac_tv);
ArrayAdapter<String> aaStr = new ArrayAdapter<String>(this,android.R.layout.dropdown_item,words);
macTv.setAdapter(aaStr);
macTv.setTokenizer(new MultiAutoCompleteTextView.CommaTokenizer() );

and:

<MultiAutoCompleteTextView 
android:id="@+id/mac_tv"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:completionThreshold="1"
/>

with this example the suggestion comes after every comma.