取消自动获得焦点和弹出对话框

!-- Dummy item to prevent AutoCompleteTextView from receiving focus -->
<LinearLayout
    android:focusable="true" android:focusableInTouchMode="true"
    android:layout_width="0px" android:layout_height="0px"/>

<!-- :nextFocusUp and :nextFocusLeft have been set to the id of this component
     to prevent the dummy from receiving focus again -->
<AutoCompleteTextView android:id="@+id/text"
        android:layout_width="fill_parent" android:layout_height="wrap_content"
        android:nextFocusUp="@+id/text" android:nextFocusLeft="@+id/text"/>上面是为了防止

AutoCompleteTextView开始就获得焦点，所以在他的父层设置了焦点设置