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?
最佳答案
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();
}
关于java - 通知数据集更改后未调用 getview,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/50941248/