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[英]Android How to refresh items after deleting from sqlite database in ExpandableListView
[英]Android How to refresh items in ExpandableListView
SQLController dbcon;
@Override
public View getChildView(int groupPosition, final int childPosition,
boolean isLastChild, View convertView, ViewGroup parent) {
final String children = (String) getChild(groupPosition, childPosition);
TextView text;
if (convertView == null) {
convertView = inflater.inflate(R.layout.listrow_details, null);
}
text = (TextView) convertView.findViewById(R.id.textView1);
text.setText(children);
convertView.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(activity, children,Toast.LENGTH_SHORT).show();
}
});
convertView.setOnLongClickListener(new View.OnLongClickListener() {
@Override
public boolean onLongClick(View view) {
AlertDialog.Builder Delete=new AlertDialog.Builder(activity);
Delete.setTitle("Show Linups Or Delete");
Delete.setMessage("Press Delete For Remove "+children+" or Press Show Lineups to get Lineups.");
Delete.setPositiveButton("Delete", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dbcon=new SQLController(activity);
dbcon.open();
Cursor c=dbcon.returnData();
if(c.moveToFirst())
{
do{
if(children.equals(c.getString(0))){
dbcon.deleteData(children);
notifyDataSetChanged();
Toast.makeText(activity,"Successfully Deleted",Toast.LENGTH_LONG).show();
break;
}
}while(c.moveToNext());
}
dbcon.close();
}
}).show();
return false;
}
});
return convertView;
}
这是我的可扩展列表适配器的getChildView方法,我正在使用Sqlite数据库,并且将数据存储到数据库中,并且还需要删除一些项目,因此当我长时间单击要删除的项目时,我使用onLongClickListener来删除项目删除按钮,当我单击该按钮时,已从数据库中删除该项目,但该项目仍显示在该活动中,直到我重新打开该应用程序为止。我想要的是,当我单击删除按钮时,它也应立即从该列表中消失,谢谢预先,
您需要更新视图的适配器。 大多数适配器都具有notifyDataSetChanged()
方法,该方法会更新其显示的数据集
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