带有自定义下拉视图的微调器不会触发onItemSelected()

概述我有一个使用自定义适配器的Spinner,其中getDropDownView()被覆盖.自定义下拉视图中的每个项目都由一个TextView和一个Button组成.但是,当我运行代码时,微调器下拉项显示得很好,但是单击它们却无济于事.旋转器下拉菜单保持打开状态,并且未触发spinner.onItemSelected().drop_down

我有一个使用自定义适配器的Spinner,其中getDropDownVIEw()被覆盖.自定义下拉视图中的每个项目都由一个TextVIEw和一个button组成.

但是,当我运行代码时,微调器下拉项显示得很好,但是单击它们却无济于事.旋转器下拉菜单保持打开状态,并且未触发spinner.onItemSelected().

drop_down_item.xml

<relativeLayout     androID:layout_wIDth="match_parent"    androID:layout_height="wrap_content">    <TextVIEw        androID:ID="@+ID/dropdown_text"        androID:layout_wIDth="match_parent"        androID:layout_height="wrap_content"        androID:layout_alignParentleft="true"        androID:singleline="true" />    <button        androID:ID="@+ID/dropdown_button"        androID:layout_height="match_parent"        androID:layout_wIDth="wrap_content"        androID:layout_alignParentRight="true"        androID:text="Remove"/></relativeLayout>

自定义适配器代码

public VIEw getDropDownVIEw(final int position, VIEw convertVIEw, VIEwGroup parent) {    LayoutInflater inflater = (LayoutInflater) mContext.getSystemService(Context.LAYOUT_INFLATER_SERVICE);    VIEw rowVIEw = inflater.inflate(R.layout.drop_down_item, parent, false);    TextVIEw textVIEw = (TextVIEw) rowVIEw.findVIEwByID(R.ID.dropdown_text);    textVIEw.setText(mValues.get(position));            button buttonVIEw = (button) rowVIEw.findVIEwByID(R.ID.dropdown_button));   return rowVIEw; }

我使用以下代码创建微调器和适配器：

spinner = (Spinner) findVIEwByID(R.ID.my_spinner);MyAdapter adapter = new MyAdapter(getVIEwContext(), R.layout.spinner_item, values);adapter.setDropDownVIEwResource(R.layout.drop_down_item);spinner.setAdapter(adapter);...spinner.setonItemSelectedListener(new AdapterVIEw.OnItemSelectedListener() {    @OverrIDe    public voID onItemSelected(AdapterVIEw<?> parentVIEw, VIEw selectedItemVIEw, int position, long ID) {        // Do something here - but this never runs    }});

所以我不知道为什么不再调用onItemSelected()？

我想知道是否需要在下拉的TextVIEw上放置一个点击侦听器,然后应该使用spinner.setSelection(pos)触发onItemSelected()？

解决方法:

事件基本上是一个接口,Activity通过单击Spinner的DropDown视图的linearLayout来实现该接口以接收回呼.

public class MyArrayAdapter extends BaseAdapter {String[] values;int Customresource;Context context;Events events;public MyArrayAdapter(Context baseContext, int customspinnervIEw,        String[] stringArray, Events events) {    values = stringArray;    context = baseContext;    this.events = events;    Customresource = customspinnervIEw;}@OverrIDepublic int getCount() {    // Todo auto-generated method stub    return values.length;}@OverrIDepublic Object getItem(int position) {    if (position < values.length)        return values[position];    else {        return null;    }}@OverrIDepublic VIEw getVIEw(final int position, final VIEw convertVIEw,        VIEwGroup parent) {    VIEw rowVIEw = convertVIEw;    LayoutInflater inflater = (LayoutInflater) context            .getSystemService(Context.LAYOUT_INFLATER_SERVICE);    if (rowVIEw == null) {        rowVIEw = inflater.inflate(Customresource, parent, false);    }    TextVIEw textVIEw = (TextVIEw) rowVIEw.findVIEwByID(R.ID.dropdown_text);    textVIEw.setText(values[position]);    button button = (button) rowVIEw.findVIEwByID(R.ID.button_text);    return rowVIEw;}@OverrIDepublic VIEw getDropDownVIEw(final int position, VIEw convertVIEw,        VIEwGroup parent) {    LayoutInflater inflater = (LayoutInflater) context            .getSystemService(Context.LAYOUT_INFLATER_SERVICE);    VIEw rowVIEw = convertVIEw;`enter code here`    if (rowVIEw == null) {        rowVIEw = inflater.inflate(Customresource, parent, false);    }    final linearLayout parentrelative = (linearLayout) rowVIEw            .findVIEwByID(R.ID.parent);    final TextVIEw textVIEw = (TextVIEw) rowVIEw            .findVIEwByID(R.ID.dropdown_text);    textVIEw.setText(values[position]);    button button = (button) rowVIEw.findVIEwByID(R.ID.button_text);    rowVIEw.setonClickListener(new OnClickListener() {        @OverrIDe        public voID onClick(VIEw v) {            events.onItemSelectedLister(                    (AdapterVIEw<?>) parentrelative.getParent(),                    parentrelative, position, (long) 0);        }    });    // button buttonVIEw = (button)    // rowVIEw.findVIEwByID(R.ID.dropdown_button);    return rowVIEw;}

事件接口它是Activity所实现的接口,以从适配器接收回调.

import androID.vIEw.VIEw;import androID.Widget.AdapterVIEw;public interface Events {public voID onItemSelectedLister(AdapterVIEw<?> parent, VIEw vIEw,        int position, long ID);}

活动实施.

onItemSelected实现是您可以执行任务的地方.

import java.lang.reflect.InvocationTargetException;import java.lang.reflect.Method;import androID.annotation.TargetAPI;import androID.app.Activity;import androID.os.Build;import androID.os.Bundle;import androID.vIEw.Menu;import androID.vIEw.MenuItem;import androID.vIEw.VIEw;import androID.Widget.AdapterVIEw;import androID.Widget.Spinner;import com.example.adapter.MyArrayAdapter;public class MainActivity extends Activity implements Events {Spinner spinner;@OverrIDeprotected voID onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentVIEw(R.layout.activity_main);    spinner = (Spinner) findVIEwByID(R.ID.spinner);    spinner.setAdapter(new MyArrayAdapter(getBaseContext(),            R.layout.customspinnervIEw, getResources().getStringArray(                    R.array.values), this));}@OverrIDepublic voID onItemSelectedLister(AdapterVIEw<?> parent, VIEw vIEw,        final int position, long ID) {        //perform your Task.......    Method method;    try {        method = Spinner.class.getDeclaredMethod("onDetachedFromWindow");        method.setAccessible(true);        try {            method.invoke(spinner);        } catch (illegalaccessexception | IllegalArgumentException                | InvocationTargetException e) {            // Todo auto-generated catch block            e.printstacktrace();        }    } catch (NoSuchMethodException e) {        // Todo auto-generated catch block        e.printstacktrace();    }    spinner.post(new Runnable() {        @OverrIDe        public voID run() {            spinner.setSelection(position);            spinner.setSelected(true);            ((MyArrayAdapter) spinner.getAdapter()).notifyDataSetChanged();        }    });}}

setContentVIEw的活动xml文件

<relativeLayout xmlns:androID="http://schemas.androID.com/apk/res/androID"xmlns:tools="http://schemas.androID.com/tools"androID:layout_wIDth="match_parent"androID:layout_height="match_parent"androID:paddingBottom="@dimen/activity_vertical_margin"androID:paddingleft="@dimen/activity_horizontal_margin"androID:paddingRight="@dimen/activity_horizontal_margin"androID:paddingtop="@dimen/activity_vertical_margin"tools:context="com.example.customspinner.MainActivity" ><Spinner    androID:ID="@+ID/spinner"    androID:layout_wIDth="match_parent"    androID:layout_height="wrap_content" ></Spinner></relativeLayout>

Spinner VIEw,它作为布局文件传递到Adapter.

<linearLayout xmlns:androID="http://schemas.androID.com/apk/res/androID"androID:layout_wIDth="match_parent"androID:layout_height="wrap_content"androID:background="#99000000"androID:ID="@+ID/parent"androID:orIEntation="horizontal"><TextVIEw    androID:ID="@+ID/dropdown_text"    androID:layout_wIDth="wrap_content"    androID:layout_height="wrap_content"/><button      androID:ID="@+ID/button_text"    androID:layout_wIDth="match_parent"    androID:layout_height="wrap_content"    androID:text="remove"/></linearLayout>

该代码可以完美运行:).我可以完美运行代码.

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