Android 我使用了3个选项卡第一个和最后一个选项卡是刷新数据，然后当我单击中心选项卡时，无法刷新我所做的操作。？

我使用了3个选项卡（请求、到达、左）单击该选项卡时，第一个选项卡和最后一个选项卡将刷新，但中心选项卡无法刷新如何帮助我

我的代码： VisitorListItems.java

public class VisitorListItems {
    String visitorname,mobileno,whomtomeet,date,time;
    int Reg_id;
    Bitmap visitorimg;
    public VisitorListItems(String visitorname,String mobileno,String whomtomeet,Bitmap visitorimg,String date,String time,int Reg_id){
        this.visitorname=visitorname;
        this.mobileno=mobileno;
        this.whomtomeet=whomtomeet;
        this.visitorimg=visitorimg;
        this.date=date;
        this.time=time;
        this.Reg_id=Reg_id;
    }

    public String getVisitorname(){
        return visitorname;
    }
    public String getMobileno(){return mobileno; }
    public String getWhomtomeet(){
        return whomtomeet;
    }
    public String getDate() { return date; }
    public String getTime(){return time;}
    public Bitmap getVisitorimg(){
        return visitorimg;
    }
    public int getReg_id(){return  Reg_id;}
}

MyListviewAdapter.java

public class MyListviewAdapter extends ArrayAdapter<VisitorListItems> {

        String RegIdno;
        private Button btnallow;
        private Button btndeny;
        private ProgressDialog pbd;
        private TextView txtWhomtomeet,txtdate,txttimein,txtregidno,txtmobil;

    ArrayList<VisitorListItems> visitorlist=new ArrayList<>();

    ConnectionClass connectionClass;
    public MyListviewAdapter(Context context,int textViewResourceId, ArrayList<VisitorListItems> objects)      {
        super(context,textViewResourceId,objects);
        visitorlist=objects;
    }
    @Override
    public int getCount() {
        return super.getCount();
    }
    @Override
    public View getView(int position, View convertview, ViewGroup parent){
        View v=convertview;
        LayoutInflater inflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        v = inflater.inflate(R.layout.registrationlisttemplate, null);
        connectionClass=new ConnectionClass();
        TextView txtvisitorname = (TextView) v.findViewById(R.id.txtvisitorname);
        btnallow=(Button)v.findViewById(R.id.btnallow);
        btndeny=(Button)v.findViewById(R.id.btndeny);
        txtWhomtomeet = (TextView) v.findViewById(R.id.txtWhomtomeet);
        txtdate=(TextView)v.findViewById(R.id.txtdate);
        txttimein=(TextView)v.findViewById(R.id.txttimein);
        txtregidno=(TextView)v.findViewById(R.id.txtregidno);
        txtmobil = (TextView) v.findViewById(R.id.txtmobil);
        ImageView imageView = (ImageView) v.findViewById(R.id.imgvisitor);
        txtvisitorname.setText(visitorlist.get(position).getVisitorname());
        txtWhomtomeet.setText(visitorlist.get(position).getWhomtomeet());
        txtmobil.setText(visitorlist.get(position).getMobileno());
        imageView.setImageBitmap(visitorlist.get(position).getVisitorimg());
        txtdate.setText(visitorlist.get(position).getDate());
        txttimein.setText(visitorlist.get(position).getTime());
        txtregidno.setText(String.valueOf(visitorlist.get(position).getReg_id()));
        txtregidno.setVisibility(View.INVISIBLE);
        btnallow.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                RegIdno=txtregidno.getText().toString();
                Visitorallow visitorallow=new Visitorallow();
                visitorallow.execute("");

            }
        });
        btndeny.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                RegIdno=txtregidno.getText().toString();
                Visitordeny visitordeny=new Visitordeny();
                visitordeny.execute("");
                // Toast.makeText(getContext(),M,Toast.LENGTH_SHORT).show();
            }
        });

        return v;

    }
    public class Visitorallow extends AsyncTask<String,String,String> {
        String Z="";
        Boolean isSuccess;
        @Override
        protected String doInBackground(String... params) {
            try{
                Connection con=connectionClass.CONN();
                if(con==null){
                    Z="Error in Connection with SQL Server";
                }
                else {
                    String query="Update app_Registration set FlatOwner='"+1+"' where Id='"+RegIdno+"'";
                    PreparedStatement preparedStatement=con.prepareStatement(query);
                    preparedStatement.executeUpdate();
                    Z="Update Successfully";
                    isSuccess=true;

                }
            }catch (Exception ex){
                isSuccess=false;
                Z="Exception";
            }

            return Z;
        }

        @Override
        protected void onPreExecute() {
            //  super.onPreExecute();
            pbd=new ProgressDialog(getContext());
            pbd.setMessage("Please Wait...");
            pbd.setCancelable(false);


            pbd.show();
        }

        @Override
        protected void onPostExecute(String s) {
            // super.onPostExecute(s);
            if(pbd.isShowing())
                pbd.dismiss();
            // btndeny.setVisibility(View.GONE);
            Toast.makeText(getContext(),s,Toast.LENGTH_SHORT).show();
        }
    }
    public class Visitordeny extends AsyncTask<String,String,String> {
        String Z="";
        Boolean isSuccess;
        @Override
        protected String doInBackground(String... params) {
            try{
                Connection con=connectionClass.CONN();
                if(con==null){
                    Z="Error in Connection with SQL Server";
                }
                else {
                    String query="Update app_Registration set FlatOwner='"+0+"' where Id='"+RegIdno+"'";
                    PreparedStatement preparedStatement=con.prepareStatement(query);
                    preparedStatement.executeUpdate();
                    Z="Update Successfully";
                    isSuccess=true;
                }
            }catch (Exception ex){
                isSuccess=false;
                Z="Exception";
            }

            return Z;
        }

        @Override
        protected void onPreExecute() {
            //  super.onPreExecute();
            pbd=new ProgressDialog(getContext());
            pbd.setMessage("Please Wait...");
            pbd.setCancelable(false);
            pbd.show();
        }

        @Override
        protected void onPostExecute(String s) {
            // super.onPostExecute(s);
            if(pbd.isShowing())
                pbd.dismiss();
            // btndeny.setVisibility(View.GONE);
            Toast.makeText(getContext(),s,Toast.LENGTH_SHORT).show();

        }

    }

}

公共类MyListviewAdapter扩展了ArrayAdapter{
字符串RegIdno；
私人按钮btnallow；
私用按钮；
私人发展对话；
私有文本视图txtwhomet、txtdate、txttimein、txtregidno、txtmobil；
ArrayList visitorlist=新建ArrayList（）；
连接类连接类；
公共MyListviewAdapter（上下文上下文、int-textViewResourceId、ArrayList对象）{
超级（上下文、textViewResourceId、对象）；
visitorlist=对象；
}
@凌驾
public int getCount（）{
返回super.getCount（）；
}
@凌驾
公共视图getView（int位置、视图转换视图、视图组父视图）{
视图v=转换视图；
LayoutInflater充气器=（LayoutInflater）getContext（）.getSystemService（Context.LAYOUT\u充气器\u SERVICE）；
v=充气机充气（R.layout.registrationlisttemplate，空）；
connectionClass=新的connectionClass（）；
TextView txtvisitorname=（TextView）v.findViewById（R.id.txtvisitorname）；
btnallow=（按钮）v.findviewbyd（R.id.btnallow）；
btndeny=（按钮）v.findViewById（R.id.btndeny）；
txtwohmtomeet=（TextView）v.findViewById（R.id.txtwohmtomeet）；
txtdate=（TextView）v.findViewById（R.id.txtdate）；
txttimein=（TextView）v.findViewById（R.id.txttimein）；
txtregidno=（TextView）v.findViewById（R.id.txtregidno）；
txtmobil=（TextView）v.findviewbyd（R.id.txtmobil）；
ImageView ImageView=（ImageView）v.findViewById（R.id.imgvisitor）；
txtvisitorname.setText（visitorlist.get（position.getVisitorname（））；
setText（visitorlist.get（position.getWhomtomeet（））；
setText（visitorlist.get（position.getMobileno（））；
setImageBitmap（visitorlist.get（position.getVisitorimg（））；
setText（visitorlist.get（position.getDate（））；
setText（visitorlist.get（position.getTime（））；
txtregidno.setText（String.valueOf（visitorlist.get（position.getReg_id（））；
txtregidno.setVisibility（视图不可见）；
btnallow.setOnClickListener（新视图.OnClickListener（）{
@凌驾
公共void onClick（视图v）{
RegIdno=txtregidno.getText（）.toString（）；
Visitorallow Visitorallow=新建Visitorallow（）；
visitorallow.execute（“”）；
}
});
btdeny.setOnClickListener（新视图.OnClickListener（）{
@凌驾
公共void onClick（视图v）{
RegIdno=txtregidno.getText（）.toString（）；
Visitordeny Visitordeny=新建Visitordeny（）；
visitordeny.execute（“”）；
//Toast.makeText（getContext（），M，Toast.LENGTH_SHORT）.show（）；
}
});
返回v；
}
公共类Visitorallow扩展异步任务{
字符串Z=“”；
布尔不成功；
@凌驾
受保护的字符串doInBackground（字符串…参数）{
试一试{
Connection con=connectionClass.CONN（）；
如果（con==null）{
Z=“与SQL Server连接时出错”；
}
否则{
String query=“Update app_Registration set FlatOwner=”“+1+”，其中Id=”“+RegIdno+”；
PreparedStatement PreparedStatement=con.prepareStatement（查询）；
preparedStatement.executeUpdate（）；
Z=“更新成功”；
isSuccess=true；
}
}捕获（例外情况除外）{
isSuccess=false；
Z=“例外”；
}
返回Z；
}
@凌驾
受保护的void onPreExecute（）{
//super.onPreExecute（）；
pbd=新建ProgressDialog（getContext（））；
设置消息（“请稍候…”）；
pbd.setCancelable（假）；
pbd.show（）；
}
@凌驾
受保护的void onPostExecute（字符串s）{
//super.onPostExecute（s）；
if（pbd.isShowing（））
pbd.discouse（）；
//btdeny.setVisibility（View.GONE）；
Toast.makeText（getContext（），s，Toast.LENGTH_SHORT）.show（）；
}
}
公共类Visitordeny扩展异步任务{
字符串Z=“”；
布尔不成功；
@凌驾
受保护的字符串doInBackground（字符串…参数）{
试一试{
Connection con=connectionClass.CONN（）；
如果（con==null）{
Z=“与SQL Server连接时出错”；
}
否则{
String query=“Update app_Registration set FlatOwner=”“+0+”，其中Id=”“+RegIdno+”；
PreparedStatement PreparedStatement=con.prepareStatement（查询）；
preparedStatement.executeUpdate（）；
Z=“更新成功”；
isSuccess=true；
}
}捕获（例外情况除外）{
isSuccess=false；
Z=“例外”；
}
返回Z；
}
@凌驾
受保护的void onPreExecute（）{
//super.onPreExecute（）；
pbd=新建ProgressDialog（getContext（））；
设置消息（“请稍候…”）；
pbd.setCancelable（假）；
pbd.show（）；
}
@凌驾
受保护的void onPostExecute（字符串s）{
//super.onPostExecute（s）；
if（pbd.isShowing（））
pbd.discouse（）；
//btdeny.setVisibility（View.GONE）；
Toast.makeText（getContext(
public class VisitorList extends Fragment {
   // private ProgressDialog pbbar;
    //private ProgressBar pbbar;
    private ProgressDialog pbd;
    private ListView lstview;
    ConnectionClass connectionClass;
    String Y = "";
    String mobileno;
    int RegIdNo;

    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        mobileno=getActivity().getIntent().getStringExtra("user_name");
        View rootView = inflater.inflate(R.layout.visitorlistslide, container, false);
        lstview = (ListView) rootView.findViewById(R.id.lstview);
      // txtregid=(TextView)rootView.findViewById(R.id.txtregid);
        connectionClass = new ConnectionClass();
        Fetch fetch = new Fetch();
        fetch.execute("");

        return rootView;
    }

   public class Fetch extends AsyncTask<String, String, String> {
        String z = "";
       ArrayList<VisitorListItems> visitorList=new ArrayList<>();

        @Override
        protected void onPreExecute() {
            pbd=new ProgressDialog(getActivity());
            pbd.setMessage("Please Wait...");
            pbd.setCancelable(false);
            pbd.show();
        }


        @Override
        protected void onPostExecute(String r) {

           // pbbar.setVisibility(View.GONE);
            if (pbd.isShowing())
                pbd.dismiss();
            //   txtregid.setText(String.valueOf(Reg_Id));
            Toast.makeText(getActivity(), r, Toast.LENGTH_SHORT).show();
            MyListviewAdapter myAdapter=new MyListviewAdapter(getActivity(),R.layout.registrationlisttemplate,visitorList);
           // myAdapter.notifyDataSetChanged();
            lstview.setAdapter(myAdapter);

        }
        @Override
        protected String doInBackground(String... params) {
            try {
                Connection con = connectionClass.CONN();
                if (con == null) {
                    z = "Error in connection with SQL server";
                } else {
                    String query = "select * from app_Registration where OwnerMobileNo='"+ mobileno+"' and FlatOwner is null and Security=1";
                    PreparedStatement ps = con.prepareStatement(query);
                   ResultSet rs = ps.executeQuery();

                    ArrayList data1 = new ArrayList();
                    while (rs.next()) {
                       //Reg_Id=rs.getInt("Id");
                        RegIdNo=rs.getInt("Id");
                        String r=rs.getString("VisitorImg");
                        //Convertong Images string to bitmap
                        byte[] decodeString = Base64.decode(r, Base64.DEFAULT);
                        Bitmap decodebitmap = BitmapFactory.decodeByteArray(decodeString,0, decodeString.length);
                        visitorList.add(new VisitorListItems("VisitorName : " + rs.getString("VisitorName"),"Whomtomeet : " + rs.getString("Whomtomeet"),"Mobile No. : " + rs.getString("MobileNo"),decodebitmap,"Visit Date :"+rs.getString("datein"),rs.getString("timein"),RegIdNo));
                    }

                    z = "Success";
                }
            } catch (Exception ex) {
                z = "Error retrieving data from table";

            }
            return z;

        }
    }


}

 public class VisitorList extends Fragment {
  // private ProgressDialog pbbar;
//private ProgressBar pbbar;
private ProgressDialog pbd;
private ListView lstview;
ConnectionClass connectionClass;
String Y = "";
String mobileno;
int RegIdNo;

public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    mobileno=getActivity().getIntent().getStringExtra("user_name");
    View rootView = inflater.inflate(R.layout.visitorlistslide, container, false);
    lstview = (ListView) rootView.findViewById(R.id.lstview);
  // txtregid=(TextView)rootView.findViewById(R.id.txtregid);


    return rootView;
}

@Override
public void setUserVisibleHint(boolean isVisibleToUser) {
    super.setUserVisibleHint(isVisibleToUser);
    if (isVisibleToUser) {
       // write here the code of refresh the data
          connectionClass = new ConnectionClass();
    Fetch fetch = new Fetch();
    fetch.execute("");

    }

}

public class Fetch extends AsyncTask<String, String, String> {
    String z = "";
   ArrayList<VisitorListItems> visitorList=new ArrayList<>();

    @Override
    protected void onPreExecute() {
        pbd=new ProgressDialog(getActivity());
        pbd.setMessage("Please Wait...");
        pbd.setCancelable(false);
        pbd.show();
    }


    @Override
    protected void onPostExecute(String r) {

       // pbbar.setVisibility(View.GONE);
        if (pbd.isShowing())
            pbd.dismiss();
        //   txtregid.setText(String.valueOf(Reg_Id));
        Toast.makeText(getActivity(), r, Toast.LENGTH_SHORT).show();
        MyListviewAdapter myAdapter=new MyListviewAdapter(getActivity(),R.layout.registrationlisttemplate,visitorList);
       // myAdapter.notifyDataSetChanged();
        lstview.setAdapter(myAdapter);

    }
    @Override
    protected String doInBackground(String... params) {
        try {
            Connection con = connectionClass.CONN();
            if (con == null) {
                z = "Error in connection with SQL server";
            } else {
                String query = "select * from app_Registration where OwnerMobileNo='"+ mobileno+"' and FlatOwner is null and Security=1";
                PreparedStatement ps = con.prepareStatement(query);
               ResultSet rs = ps.executeQuery();

                ArrayList data1 = new ArrayList();
                while (rs.next()) {
                   //Reg_Id=rs.getInt("Id");
                    RegIdNo=rs.getInt("Id");
                    String r=rs.getString("VisitorImg");
                    //Convertong Images string to bitmap
                    byte[] decodeString = Base64.decode(r, Base64.DEFAULT);
                    Bitmap decodebitmap = BitmapFactory.decodeByteArray(decodeString,0, decodeString.length);
                    visitorList.add(new VisitorListItems("VisitorName : " + rs.getString("VisitorName"),"Whomtomeet : " + rs.getString("Whomtomeet"),"Mobile No. : " + rs.getString("MobileNo"),decodebitmap,"Visit Date :"+rs.getString("datein"),rs.getString("timein"),RegIdNo));
                }

                z = "Success";
            }
        } catch (Exception ex) {
            z = "Error retrieving data from table";

        }
        return z;

    }
}


}