1 <?xml version="1.0" encoding="utf-8"?> 2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 3     xmlns:tools="http://schemas.android.com/tools" 4     android:layout_width="fill_parent" 5     android:layout_height="50dip" 6     android:background="@android:drawable/edit_text" 7     android:paddingRight="10dip"  8     android:weightSum="4"> 9 10     <AutoCompleteTextView11         android:id="@+id/repeateMode"12         android:layout_width="0dip"13         android:layout_height="fill_parent"14         android:layout_weight="3"15         android:background="@null"16         android:cacheColorHint="#00000000"17         android:completionThreshold="1"18         android:dropDownHorizontalOffset="20dp"19         android:ems="10"20         android:gravity="center_vertical" >21 22         <requestFocus />23     </AutoCompleteTextView>24 25     <ImageButton26         android:id="@+id/repeateModeBtn"27         android:layout_width="0dp"28         android:layout_height="fill_parent"29         android:layout_weight="1.0"30         android:src="http://www.mamicode.com/@android:drawable/btn_dropdown"31         />32 33 </LinearLayout>

……    private void init(Context context) {        // this.context = context;        LayoutInflater.from(context).inflate(R.layout.auto_spinner, this);        adapter = new ArrayAdapter<String>(context,                android.R.layout.simple_dropdown_item_1line, list);        text = (AutoCompleteTextView) this.findViewById(R.id.repeateMode);        text.setAdapter(adapter);        button = (ImageButton) this.findViewById(R.id.repeateModeBtn);        button.setOnClickListener(new OnClickListener() {            @Override            public void onClick(View v) {                // 显示下拉框                text.showDropDown();            }        });    }