Question

我已经在我的ListView中实现了一个搜索栏，到目前为止它的工作正常，除了适配器表现得很奇怪。每当我调用其清除功能时，我的列表视图仍会显示“旧”内容。

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);
    }               
}

}

调试器显示只更改了数据大小但没有更改其内容。我在这里想念什么吗？

一些额外的代码：

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();

    }

}}

这是让我头痛的功能。它来自MYSCREEN派生类之一，哦，它也是从搜索按钮clickevent中调用的。

    @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;
            }               

        }


    });
}

Answer 1

我试过这段代码.. 在我们创建CustomListView适配器的oncreate（）中，调用一个函数。

adapter.clear();

CustomListViewAdapter类上的

创建一个清晰的函数

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

}

其中movieItems是ListView的名称

Answer 2

改为呼叫notifyDataSetChanged()。

一般情况下，如果项属性发生更改，则使用notifyDataSetInvalidated（）;如果项本身发生更改，则使用notifyDataSetChanged（）（即删除或添加项目）。

清除自定义适配器

2 个答案: