android– 如何将Dropdown微调器锚定到父Linearlayout？

概述如何将Dropdown微调器锚定到一个相同的Linearlayout？我在水平LinearLayout中有一个TextView和一个微调器.我想将LinearLayout设置为微调器下拉列表的锚点.就像你可以使用AutoCompleteTextViews下拉菜单一样.<LinearLayoutandroid:id="@+id/parent"

如何将Dropdown微调器锚定到一个相同的linearlayout？

我在水平linearLayout中有一个TextVIEw和一个微调器.我想将linearLayout设置为微调器下拉列表的锚点.就像你可以使用autoCompleteTextVIEws下拉菜单一样.

        <linearLayout            androID:ID="@+ID/parent"            androID:layout_wIDth="fill_parent"            androID:layout_height="fill_parent"            androID:orIEntation="horizontal"            androID:gravity="bottom"            androID:weightSum="1" >            <autoCompleteTextVIEw                androID:ID="@+ID/autoText"                androID:layout_wIDth="0dp"                androID:layout_height="fill_parent"                androID:layout_weight=".8"                androID:gravity="bottom"                androID:dropDownAnchor="@ID/parent"/>            <mycode.CustomSpinner                androID:ID="@+ID/customSpinner"                androID:layout_wIDth="0dp"                androID:layout_height="fill_parent"                androID:layout_weight=".2"                androID:drawSelectorOntop="true"                androID:gravity="bottom"/>        </linearLayout>

解决方法:

我发现最简单的方法是扩展Imagebutton并添加ListPopupWindow.

public class MenuDropDown extends Imagebutton {    private ListPopupWindow mListDropDownWindow;    private int mDropDownAnchorID;    private listadapter mAdapter;    private DropDownOnClickListener mDropDownOnClickListener;    private OnItemClickListener mOnItemClickListener;    public MenuDropDown(Context context, AttributeSet attrs) {        this(context, attrs,R.attr.menuDropDown);    }    public MenuDropDown(Context context) {        this(context, null);    }    public MenuDropDown(Context context, AttributeSet attrs, int defStyle) {        super(context, attrs, defStyle);        mListDropDownWindow = new ListPopupWindow(context);        mListDropDownWindow                .setPromptposition(ListPopupWindow.position_PROMPT_BELOW);        TypedArray a = context.obtainStyledAttributes(attrs,                R.styleable.MenuDropDown, defStyle, 0);        mDropDownAnchorID = a.getResourceID(                R.styleable.MenuDropDown_dropDownAnchor,                VIEw.NO_ID);        mListDropDownWindow                .setonItemClickListener(new DropDownItemClickListener());        mListDropDownWindow.setModal(true);        a.recycle();        setFocusable(true);        mDropDownOnClickListener = new DropDownOnClickListener();        super.setonClickListener(mDropDownOnClickListener);    }    private class DropDownItemClickListener implements            AdapterVIEw.OnItemClickListener {        @OverrIDe        public voID onItemClick(AdapterVIEw<?> parent, VIEw v, int position,                long ID) {            dissmissDropDown();            if(mOnItemClickListener != null){                mOnItemClickListener.onItemClick(parent, v, position, ID);            }        }    }    private class DropDownOnClickListener implements OnClickListener {        @OverrIDe        public voID onClick(VIEw v) {            showDropDown();        }    }    private voID dissmissDropDown() {        mListDropDownWindow.dismiss();    }    public <T extends listadapter> voID setAdapter(T adapter) {        mAdapter = adapter;        mListDropDownWindow.setAdapter(mAdapter);    }    public boolean isPopupShowing() {        return mListDropDownWindow.isShowing();    }    public voID setonItemClickListener(AdapterVIEw.OnItemClickListener Listener){        mOnItemClickListener = Listener;    }    private voID showDropDown() {        if (mListDropDownWindow.getAnchorVIEw() == null) {            if (mDropDownAnchorID != VIEw.NO_ID) {                mListDropDownWindow.setAnchorVIEw(getRootVIEw().findVIEwByID(                        mDropDownAnchorID));            } else {                mListDropDownWindow.setAnchorVIEw(this);            }        }        mListDropDownWindow.show();        if (VERSION.SDK_INT >= 9) {            mListDropDownWindow.getListVIEw().setoverScrollMode(VIEw.OVER_SCRolL_ALWAYS);        }    }    public listadapter getAdapter() {        return mAdapter;    }}

attrs.xml：

<attr name="menuDropDown" format="reference" /><declare-styleable name="MenuDropDown" perent="Imagebutton">    <attr name="dropDownAnchor" format="reference" /></declare-styleable>

布局：
        

        <autoCompleteTextVIEw            androID:ID="@+ID/autoText"            androID:layout_wIDth="0dp"            androID:layout_height="fill_parent"            androID:layout_weight=".8"            androID:gravity="bottom"            androID:dropDownAnchor="@ID/parent"/>        <mycode.MenuDropDown            androID:ID="@+ID/customSpinner"            androID:layout_wIDth="0dp"            androID:layout_height="fill_parent"            androID:layout_weight=".2"            androID:drawSelectorOntop="true"            mycode:dropDownAnchor="@ID/parent"            androID:gravity="bottom"/>    </linearLayout>

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