java - 通知数据集更改后未调用 getview

Question

所以我正在开发实时 ListView ，我需要 ListView 在单击按钮时更新，这些也是如此:

private void ReloadData(){
    DataList.clear();
    try{
        for (int i =0;i<ItemsCount;i++){
            TempItem=new STRUCTS.STRUCT_ProductItem();
            TempItem.setName(dbh.ReadDefine(ProductID,i+"","name")+"");//Read name if there is any set
            TempItem.setImgs(Uri.parse(dbh.ReadDefine(ProductID,i+"","img")+""));//Read image if there is any set
            TempItem.setInfo("PR"+i);//Desc

            Log.i("TAG", "ReloadData: "+IsOn[i]);//Is product avalible

            TempItem.setToggled(IsOn[i]);
            DataList.add(TempItem);

        }
    }catch (Exception ex){
        ex.printStackTrace();
        Log.e("ERRORCATCHER", "OnForLoop (Fill Product Data): "+ex.getMessage() );
    }
    //


    if(!IsAdapterSet){

        adapter = new LISTCUSTOM_ProductITEM(MyActivity.this,DataList);
        list.setAdapter(adapter);


        IsAdapterSet=true;
    }else{


        try {


            adapter.swapItems(DataList);


        } catch (Exception e) {
            e.printStackTrace();
        }

    }


}

我的自定义适配器上的 SwapItems:

 public void swapItems(ArrayList<STRUCTS.STRUCT_ProductItem> list) throws InterruptedException {
    DataList=list;
    this.notifyDataSetChanged();

}

这没有给出任何错误，正如我从日志中看到的那样，新项目已成功添加，并且它们的数据是新的

listview 不会自行更新!所以当我单击运行 ReloadData() 的按钮时它对 ListView 没有影响...

实际上此日志正在运行:

      @Override
    public View getView(final int CPosition, @Nullable View convertView, @NonNull ViewGroup parent) {
            final STRUCTS.STRUCT_ProductItem Currect_Item=DataList.get(CPosition);
        Log.i("TAG", "View updated : "+Currect_Item.gettoggled());
/*Define stuff*/
 itempicture.setImageURI(Currect_Item.getImgs());
/*More listview update stuff*/

当我单击该按钮时，它不会记录 ViewUpdated，并且不会更改任何 ListView 元素

但是当我滚动 ListView 时，项目不可见，然后我向后滚动，它们的数据已更新!

GetView is runned when a item lose visibility then gain it again

为什么 Notifydatachanged 不会更新 UI/在我的自定义适配器上运行 GetView？

Answer 1

尝试编码

     private void ReloadData(){
        DataList.clear();
        if(!IsAdapterSet){

    adapter = new LISTCUSTOM_ProductITEM(MyActivity.this,DataList);
    list.setAdapter(adapter);


    IsAdapterSet=true;
}
        try{
            for (int i =0;i<ItemsCount;i++){
                TempItem=new STRUCTS.STRUCT_ProductItem();
                TempItem.setName(dbh.ReadDefine(ProductID,i+"","name")+"");//Read name if there is any set
                TempItem.setImgs(Uri.parse(dbh.ReadDefine(ProductID,i+"","img")+""));//Read image if there is any set
                TempItem.setInfo("PR"+i);//Desc

                Log.i("TAG", "ReloadData: "+IsOn[i]);//Is product avalible

                TempItem.setToggled(IsOn[i]);
                DataList.add(TempItem);

            }
        adapter.swapItems(DataList);
        }catch (Exception ex){
            ex.printStackTrace();
            Log.e("ERRORCATCHER", "OnForLoop (Fill Product Data): "+ex.getMessage() );
        }


    }
    }

在适配器类

public void swapItems(ArrayList<STRUCTS.STRUCT_ProductItem> list) throws InterruptedException {
DataList.addAll(list);
this.notifyDataSetChanged();

}