清除自定义适配器

本文介绍了清除自定义适配器的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

香港专业教育学院implented一个搜索栏到我的ListView和到目前为止，它工作正常，除了 该适配器怪怪的。每次我调用它的清除功能我的列表视图仍显示旧的内容。

公共抽象类MYLISTITEM扩展了BaseAdapter { 民营背景的活动; 私人列表＆LT;字符串＆GT;数据; 私有静态LayoutInflater吹气= NULL; 私人诠释ItemIcon; 私人布尔moreVis; 公共MYISTITEM（背景信息，INT IconID，布尔VIS）{     活性= A;     数据=新的ArrayList＆LT;字符串＆GT;（）;     充气=（LayoutInflater）activity.getSystemService（Context.LAYOUT_INFLATER_SERVICE）;     ItemIcon = IconID;     moreVis =可见; } 公共无效添加（String对象） {     data.add（对象）;     notifyDataSetChanged（）; } 公共无效REPLACE（INT指数，String对象） {     在data.set（索引，对象）;     notifyDataSetChanged（）; } 公共无效清除（） {     data.clear（）;     notifyDataSetChanged（）; } 公共无效删除（Object对象） {     data.remove（对象）;     notifyDataSetChanged（）; } @覆盖 公众诠释getCount将（）{     // TODO自动生成方法存根     返回data.size（）; } 公共无效插入（String对象，INT C） {     在data.set（C，对象）;     notifyDataSetChanged（）; } @覆盖 公共字符串的getItem（INT位置）{     // TODO自动生成方法存根     如果（位置＆GT; = 0＆功放;＆安培;位置＆LT; data.size（））     {         返回data.get（位置）;     }     返回null; } @覆盖 众长getItemId（INT位置）{     // TODO自动生成方法存根     返回的位置; } 公共静态类ViewHolder {     公共TextView的文字;     公众ImageView的形象; } @覆盖 公共查看getView（INT位置，查看convertView，ViewGroup中父）{     查看VI = convertView;     ViewHolder持有人;     如果（convertView == NULL）{         VI = inflater.inflate（R.layout.item，父母，假）;         持有人=新ViewHolder（）;         holder.text =（TextView中）vi.findViewById（R.id.text）;         holder.image =（ImageView的）vi.findViewById（R.id.image）;         vi.setTag（保持器）;     }     其他         支架=（ViewHolder）vi.getTag（）;     holder.text.setText（data.get（位置））;     holder.image.setImageDrawable（activity.getResources（）getDrawable（ItemIcon））;     的ImageButton btn_more =（的ImageButton）vi.findViewById（R.id.more）;     如果（moreVis）     {         btn_more.setOnClickListener（新OnMoreClickListener（btn_more，位置））;     }     其他     {         btn_more.setVisibility（View.GONE）;     }     vi.setOnClickListener（新OnRowClickListener（六，位置））;     返回六; } 公共抽象无效OnRowClick（查看MVIEW，INT位置）; 公共抽象无效OnMoreClick（查看MVIEW，INT位置）; 私有类OnRowClickListener实现OnClickListener {     私人诠释mPosition;     私人查看MView的;     OnRowClickListener（查看视图，INT位置）{             mPosition =位置;             MVIEW =图。     }     @覆盖     公共无效的onClick（查看为arg0）{         OnRowClick（MVIEW，mPosition）;     } } 私有类OnMoreClickListener实现OnClickListener {     私人诠释mPosition;     私人查看MView的;     OnMoreClickListener（查看视图，INT位置）{             mPosition =位置;             MVIEW =图。     }     @覆盖     公共无效的onClick（查看为arg0）{             OnMoreClick（MVIEW，mPosition）;     } }

}

调试器显示，数据的唯一的大小已被改变，但没有其内容。我怀念的东西在这里???

一些额外的code：

公共抽象类自选扩展的ListView { 公共抽象无效的init（）; 公共抽象无效OnLoadFinished（）; 公共抽象无效OnRowClicked（INT位）; 公共抽象无效onCreateQuickAction（MYQUICKACTION行动，诠释位置）; 公共抽象无效CreateOptionMenu（功能菜单）; 公共抽象布尔OptionsItemSelected（菜单项项）; 公共MYLISTITEM适配器= NULL; 公共静态无效StartupScreen（活动电流，类＆LT;＆gt;接下来） {     意图myIntent =新的意图（目前，下一个）;     current.startActivity（myIntent）; } 公共自选画面（活动的背景下，INT图标）{     超（上下文）;     布尔moreisvis = TRUE;     MYQUICKACTION canarybirdybirdy =新MYQUICKACTION（新景（上​​下文））;     onCreateQuickAction（canarybirdybirdy，0）;     如果（canarybirdybirdy.anchor.getVisibility（）！= View.VISIBLE）     {         moreisvis = FALSE;     }     适配器=新MYLISTITEM（上下文，图标，moreisvis）{         @覆盖         公共无效OnRowClick（查看MVIEW，INT位置）{             // TODO自动生成方法存根             OnRowClicked（位置）;         }         @覆盖         公共无效OnMoreClick（查看MVIEW，INT位置）{             // TODO自动生成方法存根             最后MYQUICKACTION mQuickAction =新MYQUICKACTION（MVIEW）;             最后的ImageButton mMoreImage =（的ImageButton）mView.findViewById（MY.views.R.id.more）;             mMoreImage.setImageResource（MY.views.R.drawable.ic_list_more_selected）;             onCreateQuickAction（mQuickAction，位置）;             mQuickAction.setAnimStyle（MYQUICKACTION.ANIM_AUTO）;             mQuickAction.setOnDismissListener（新OnDismissListener（）{                 @覆盖                 公共无效onDismiss（）{                     mMoreImage.setImageResource（MY.views.R.drawable.ic_list_more）;                 }             }）;             mQuickAction.show（）;         }     };     最后ProgressDialog对话框=新ProgressDialog（上下文）;     dialog.setMessage（载入中...）;     dialog.show（）;     新的Loader（）{         @覆盖         公共无效RunThread（）{             在里面（）;         }         @覆盖         公共无效FinishLoad（）{             dialog.dismiss（）;             OnLoadFinished（）;         }     }。开始（）; } 公共抽象类MYTHREAD扩展的AsyncTask＆LT;虚空，虚空，虚空＆GT; {     公共抽象无效InitThread（）;     公共抽象无效RunThread（）;     公共抽象无效FinishThread（）;     @覆盖     保护无效doInBackground（虚空...... PARAMS）{         RunThread（）;         // TODO自动生成方法存根         返回null;     }     // UI的东西允许     @覆盖     在preExecute保护无效（）{         InitThread（）;     }     // UI的东西允许     @覆盖     保护无效onProgressUpdate（空...值）{         super.onProgressUpdate（值）;     }     // UI的东西允许     @覆盖     保护无效onPostExecute（最终虚空未使用）{         FinishThread（）;     }     公共无效启动（）     {         this.execute（）;     } } 公共抽象类加载器扩展MYTHREAD {     公共抽象无效FinishLoad（）;     @覆盖     公共无效InitThread（）{         // TODO自动生成方法存根     }     @覆盖     公共无效FinishThread（）{         // TODO自动生成方法存根         FinishLoad（）;     } }}

和这里的功能，让我headache.Its从自选派生类中的一个，哦，它也被称为从搜索按钮clickevent。

@覆盖 公共无效OnLoadFinished（）{     // TODO自动生成方法存根     SelectedTable = TabController.Instance.Clients [TabController.Instance.selectedtab？ 1：0] .DbTablename;     adapter.clear（）;     TabController.Instance.Clients [TabController.Instance.selectedtab？ 1：0] .MetaEntities（SelectedTable，真，新ClientCallBackHandler（）{         @覆盖         公共无效StartCallBack（）{             // TODO自动生成方法存根             prgdialog.setMessage（连接服务......）;             prgdialog.show（）;         }         @覆盖         公共无效EndCallBack（布尔成功）{             // TODO自动生成方法存根             如果（成功）             {                 尝试{                     ExceptionResponse除=（ExceptionResponse）this.response;                     ab.setMessage（Html.fromHtml（＆其中b取代;＆所述;字体颜色=＃FF0000＆gt;中+ except.Message））;                     ab.setPositiveButton（OK，NULL）;                     ab.show（）;                     成功= FALSE;                 }赶上（例外五）                 {                     MetadataEntitiesResponse RESP =（MetadataEntitiesResponse）响应;                     如果（resp.Entities [0]！= NULL）                     {                         耳鼻喉科= resp.Entities [0];                         INT I = 0;                         //搜索我们数据库中的第一个字符串...                         对于（AttributeMetaData ATT：Ent.Attributes）                         {                             如果（Att.Type.contentEquals（字符串））                             {                                 SelectedAttribute =我;                                 打破;                             }                             我++;                         }                         StartQuery（0）; //这里适配器被充满信息                     }                 }             }         }     }）; }

私人无效StartQuery（INT页） {     如果（当前是！= -1）     {         下一页=页面;         返回;     }     查询查询=新的Query（）;     query.EntityName = Ent.Name;     如果（SearchFilter！= NULL）     {         query.Filter =新的过滤器（）;         query.Filter.Filters = SearchFilter;         query.Filter.FilterOperator = Filter.E_FilterOperator.And;     }     query.Columns =新AllColumns（）;     query.Limit =新的限制（）;     query.Limit.Count = 15;     订购订购=新订单（）;     order.OrderType = Order.OrderTypeE.Ascending;     order.AttributeName = Ent.Attributes [SelectedAttribute] .Name点;     query.Orders =新订单[] {为了};     当前页= query.Limit.Page =页面;     TabController.Instance.Clients [TabController.Instance.selectedtab？ 1：0] .RetrieveMultiple（查询，新ClientCallBackHandler（）{         @覆盖         公共无效StartCallBack（）{             // TODO自动生成方法存根         }         @覆盖         公共无效EndCallBack（布尔成功）{             // TODO自动生成方法存根             尝试{                 ExceptionResponse除=（ExceptionResponse）this.response;                 ab.setMessage（Html.fromHtml（＆其中b取代;＆所述;字体颜色=＃FF0000＆gt;中+ except.Message））;                 ab.setPositiveButton（OK，NULL）;                 ab.show（）;                 成功= FALSE;             }赶上（例外五）             {                 RetrieveMultipleResponse rmResp =（RetrieveMultipleResponse）this.response;                 如果（adapter.getCount（）== 0）                 {                     的for（int i = 0; I＆LT; rmResp.TotalRecords;我++）                     {                         prgdialog.setMessage（（（int）的（ⅰ/ rmResp.TotalRecords * 100））+％）;                         adapter.add（连接...）;                     }                     prgdialog.dismiss（）;                 }                 INT I = 0;                 对于（实体耳鼻喉科：rmResp.Entities）                 {                     adapter.replace（当前页* 15 + I，ent.Properties [SelectedAttribute]的ToString（））;                     我++;                 }                 如果（当前页==下一页）                 {                     下一页= -1;                 }                 其他                 {                     StartQuery（下一页）;                 }                 当前页= -1;             }         }     }）; }

解决方案

我想这code .. 在我们正在创建的CustomListView适配器的OnCreate（），调用一个函数。

adapter.clear（）;

在CustomListViewAdapter类来创建一个功能明确

公共无效清除（）{     // TODO自动生成方法存根     movieItems.clear（）; }

在这里movieItems是ListView控件的名称

ive implented a searchbar into my ListView and so far it works correctly except that the adapter is acting weird. Everytime i call its clear function my listview still shows the "old" content.

public abstract class MYLISTITEM extends BaseAdapter { private Context activity; private List<String> data; private static LayoutInflater inflater=null; private int ItemIcon; private boolean moreVis; public MYISTITEM(Context a, int IconID,boolean vis) { activity = a; data = new ArrayList<String>(); inflater = (LayoutInflater)activity.getSystemService(Context.LAYOUT_INFLATER_SERVICE); ItemIcon = IconID; moreVis = vis; } public void add(String object) { data.add(object); notifyDataSetChanged(); } public void replace(int index,String object) { data.set(index, object); notifyDataSetChanged(); } public void clear() { data.clear(); notifyDataSetChanged(); } public void remove(Object object) { data.remove(object); notifyDataSetChanged(); } @Override public int getCount() { // TODO Auto-generated method stub return data.size(); } public void insert(String object,int c) { data.set(c, object); notifyDataSetChanged(); } @Override public String getItem(int position) { // TODO Auto-generated method stub if(position >= 0 && position < data.size()) { return data.get(position); } return null; } @Override public long getItemId(int position) { // TODO Auto-generated method stub return position; } public static class ViewHolder{ public TextView text; public ImageView image; } @Override public View getView(int position, View convertView, ViewGroup parent) { View vi=convertView; ViewHolder holder; if(convertView==null){ vi = inflater.inflate(R.layout.item,parent, false); holder=new ViewHolder(); holder.text=(TextView)vi.findViewById(R.id.text); holder.image=(ImageView)vi.findViewById(R.id.image); vi.setTag(holder); } else holder=(ViewHolder)vi.getTag(); holder.text.setText(data.get(position)); holder.image.setImageDrawable(activity.getResources().getDrawable(ItemIcon)); ImageButton btn_more = (ImageButton) vi.findViewById(R.id.more); if(moreVis) { btn_more.setOnClickListener(new OnMoreClickListener(btn_more,position)); } else { btn_more.setVisibility(View.GONE); } vi.setOnClickListener(new OnRowClickListener(vi,position)); return vi; } public abstract void OnRowClick(View mView, int position); public abstract void OnMoreClick(View mView, int position); private class OnRowClickListener implements OnClickListener{ private int mPosition; private View mView; OnRowClickListener(View view,int position){ mPosition = position; mView = view; } @Override public void onClick(View arg0) { OnRowClick(mView,mPosition); } } private class OnMoreClickListener implements OnClickListener{ private int mPosition; private View mView; OnMoreClickListener(View view,int position){ mPosition = position; mView = view; } @Override public void onClick(View arg0) { OnMoreClick(mView,mPosition); } }

}

the debugger shows that only the size of data has been changed but none of its content. Do i miss something here???

some additional code:

public abstract class MYSCREEN extends ListView{ public abstract void Init(); public abstract void OnLoadFinished(); public abstract void OnRowClicked(int position); public abstract void onCreateQuickAction(MYQUICKACTION action,int position); public abstract void CreateOptionMenu(Menu menu); public abstract boolean OptionsItemSelected(MenuItem item); public MYLISTITEM adapter = null; public static void StartupScreen(Activity current,Class<?> next) { Intent myIntent = new Intent(current,next); current.startActivity(myIntent); } public MYSCREEN(Activity context,int Icon) { super(context); boolean moreisvis = true; MYQUICKACTION canarybirdybirdy = new MYQUICKACTION(new View(context)); onCreateQuickAction(canarybirdybirdy,0); if(canarybirdybirdy.anchor.getVisibility() != View.VISIBLE) { moreisvis = false; } adapter = new MYLISTITEM(context,Icon,moreisvis){ @Override public void OnRowClick(View mView, int position) { // TODO Auto-generated method stub OnRowClicked(position); } @Override public void OnMoreClick(View mView, int position) { // TODO Auto-generated method stub final MYQUICKACTION mQuickAction = new MYQUICKACTION(mView); final ImageButton mMoreImage = (ImageButton) mView.findViewById(MY.views.R.id.more); mMoreImage.setImageResource(MY.views.R.drawable.ic_list_more_selected); onCreateQuickAction(mQuickAction,position); mQuickAction.setAnimStyle(MYQUICKACTION.ANIM_AUTO); mQuickAction.setOnDismissListener(new OnDismissListener() { @Override public void onDismiss() { mMoreImage.setImageResource(MY.views.R.drawable.ic_list_more); } }); mQuickAction.show(); } }; final ProgressDialog dialog = new ProgressDialog(context); dialog.setMessage("loading..."); dialog.show(); new LOADER(){ @Override public void RunThread() { Init(); } @Override public void FinishLoad() { dialog.dismiss(); OnLoadFinished(); } }.Start(); } public abstract class MYTHREAD extends AsyncTask<Void, Void, Void> { public abstract void InitThread(); public abstract void RunThread(); public abstract void FinishThread(); @Override protected Void doInBackground(Void... params) { RunThread(); // TODO Auto-generated method stub return null; } //ui stuff allowed @Override protected void onPreExecute() { InitThread(); } //ui stuff allowed @Override protected void onProgressUpdate(Void... value) { super.onProgressUpdate(value); } //ui stuff allowed @Override protected void onPostExecute(final Void unused) { FinishThread(); } public void Start() { this.execute(); } } public abstract class LOADER extends MYTHREAD{ public abstract void FinishLoad(); @Override public void InitThread() { // TODO Auto-generated method stub } @Override public void FinishThread() { // TODO Auto-generated method stub FinishLoad(); } }}

and here is the function that gives me the headache.Its from one of MYSCREEN derived classes , oh and its also called from the search-buttons clickevent.

@Override public void OnLoadFinished() { // TODO Auto-generated method stub SelectedTable = TabController.Instance.Clients[TabController.Instance.selectedtab ? 1 : 0].DbTablename; adapter.clear(); TabController.Instance.Clients[TabController.Instance.selectedtab ? 1 : 0].MetaEntities(SelectedTable, true, new ClientCallBackHandler(){ @Override public void StartCallBack() { // TODO Auto-generated method stub prgdialog.setMessage("connecting service..."); prgdialog.show(); } @Override public void EndCallBack(boolean success) { // TODO Auto-generated method stub if(success) { try{ ExceptionResponse except = (ExceptionResponse) this.response; ab.setMessage(Html.fromHtml("<b><font color=#ff0000>" + except.Message)); ab.setPositiveButton("ok", null); ab.show(); success = false; }catch(Exception e) { MetadataEntitiesResponse resp = (MetadataEntitiesResponse) response; if(resp.Entities[0] != null) { Ent = resp.Entities[0]; int i = 0; //search for the first string in our database ... for(AttributeMetaData Att : Ent.Attributes) { if(Att.Type.contentEquals("string")) { SelectedAttribute = i; break; } i++; } StartQuery(0); //here the adapter gets filled with info } } } } }); }

private void StartQuery(int page) { if(currentpage != -1) { nextpage = page; return; } Query query = new Query(); query.EntityName = Ent.Name; if(SearchFilter != null) { query.Filter = new Filter(); query.Filter.Filters = SearchFilter; query.Filter.FilterOperator = Filter.E_FilterOperator.And; } query.Columns = new AllColumns(); query.Limit = new Limit(); query.Limit.Count = 15; Order order = new Order(); order.OrderType = Order.OrderTypeE.Ascending; order.AttributeName = Ent.Attributes[SelectedAttribute].Name; query.Orders = new Order[] {order}; currentpage = query.Limit.Page = page; TabController.Instance.Clients[TabController.Instance.selectedtab ? 1 : 0].RetrieveMultiple(query, new ClientCallBackHandler(){ @Override public void StartCallBack() { // TODO Auto-generated method stub } @Override public void EndCallBack(boolean success) { // TODO Auto-generated method stub try{ ExceptionResponse except = (ExceptionResponse) this.response; ab.setMessage(Html.fromHtml("<b><font color=#ff0000>" + except.Message)); ab.setPositiveButton("ok", null); ab.show(); success = false; }catch(Exception e) { RetrieveMultipleResponse rmResp = (RetrieveMultipleResponse) this.response; if(adapter.getCount() == 0) { for(int i = 0; i< rmResp.TotalRecords;i++) { prgdialog.setMessage( ((int) (i/rmResp.TotalRecords * 100)) + "%"); adapter.add("connecting..."); } prgdialog.dismiss(); } int i = 0; for(Entity ent : rmResp.Entities) { adapter.replace(currentpage*15+i, ent.Properties[SelectedAttribute].ToString()); i++; } if(currentpage == nextpage) { nextpage = -1; } else { StartQuery(nextpage); } currentpage = -1; } } }); }

解决方案

i tried this code.. in oncreate() of where we are creating the CustomListView Adapter, call a function.

adapter.clear();

on the CustomListViewAdapter class create a function as clear

public void clear() { // TODO Auto-generated method stub movieItems.clear(); }

where movieItems is the name of the ListView