Question

所以我正在实时列表视图中工作，我需要列表视图以在单击按钮时进行更新，所以这些操作也是这样：

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交换项：

 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其数据是新的

listview不会自我更新！所以当我单击运行ReloadData（）的按钮时它对列表视图没有影响...

该日志正在运行：

      @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，当我滚动列表视图时，因此看不到任何项，然后我向后滚动，其数据将更新！

当某项失去可见性然后再次获得它时，将运行GetView

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

Answer 1

尝试使用此代码

     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() );
        }


    }
    }

在适配器类中

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

}

Answer 2

尝试一下

private void ReloadData(){
    ArrayList<STRUCTS.STRUCT_ProductItem> list = new ArrayList<>;
    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]);
            list.add(TempItem);
        }
    } catch (Exception ex){
        ex.printStackTrace();
        Log.e("ERRORCATCHER", "OnForLoop (Fill Product Data): "+ex.getMessage() );
    }

    DataList.clear();
    DataList.addAll(list);

    adapter.notifyDataSetChanged();
}

notifydatasetchanged后未调用getview

2 个答案: