我有一个从数据库中检索数据并将其显示在 ListView 中的应用程序。我有一个自定义适配器。因此,当我按下“删除”按钮时,会显示列表中每一行的删除按钮。如果我按那个,数据库中的特定行将被删除,并且 ListView 中也应该反射(reflect)出来。问题是,它没有反射(reflect)此更改,我应该关闭应用程序并重新打开或移动到其他一些 Activity 并返回以查看更新的结果。
所以我的问题是:我在哪里调用 notifyDataSetChanged()
方法来立即更新它?
这是我的自定义适配器 View :
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
MenuListItems menuListItems = menuList.get(position);
if (convertView == null) {
LayoutInflater inflater = (LayoutInflater) c
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.customlist, parent, false);
}
Button ck = (Button) convertView.findViewById(R.id.delbox);
if(i){
ck.setVisibility(View.VISIBLE);}
else{
ck.setVisibility(View.GONE);
}
ck.setTag(menuListItems.getSlno());
ck.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
final Integer Index = Integer.parseInt((String) v.getTag());
final DataHandler enter = new DataHandler(c);
DialogInterface.OnClickListener dialogClickListener = new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
switch (which){
case DialogInterface.BUTTON_POSITIVE:
//Yes button clicked
enter.open();
enter.delet(Index);
enter.close();
notifyDataSetChanged();
dialog.dismiss();
break;
case DialogInterface.BUTTON_NEGATIVE:
//No button clicked
dialog.dismiss();
break;
}
}
};
AlertDialog.Builder builder = new AlertDialog.Builder(c);
builder.setMessage("Are you sure you want to Delete?").setPositiveButton("Yes", dialogClickListener)
.setNegativeButton("No", dialogClickListener).show();
}
});
TextView id = (TextView) convertView.findViewById(R.id.tvhide);
id.setText(menuListItems.getSlno());
TextView title = (TextView) convertView.findViewById(R.id.tvtitle);
title.setText(menuListItems.getTitle());
TextView phone = (TextView) convertView.findViewById(R.id.tvpnumber);
phone.setText(menuListItems.getPhone());
// ck.setChecked(menuList.)
notifyDataSetChanged();
return convertView;
}
最佳答案
您需要通过 adapter.remove(adapter.getItem(position));
从 ListView 的适配器中删除数据,然后在适配器上调用 notifyDataSetChanged()
.
关于android:从数据库中删除后 ListView 中的数据刷新,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/27640658/