<AutoCompleteTextView 

   android:completionThreshold="3"

   android:id="@+id/actext1"

   android:layout_width="match_parent"

   android:layout_height="wrap_content"

   android:hint="请随意输入"

   />

<MultiAutoCompleteTextView

   android:id="@+id/multiAutoCompleteTextView1"

   android:layout_width="wrap_content"

   android:layout_height="wrap_content"

   android:layout_marginTop="26dp"

   android:ems="10"

   android:hint="MultiAutoCompleteTextView" >

   <requestFocus />

</MultiAutoCompleteTextView>