如何通过在基本适配器中调用 notifyDatasetChanged 来刷新列表视图

Question

我的片段类中的按钮列表视图是使用自定义适配器填充的。当按下列表视图中存在的按钮时，我想删除该项目。这里我使用了notifyDataSetChanged从我的适配器类中单击按钮，但它不反映任何结果。谁能告诉我如何从适配器类更新列表视图 这是我在单击按钮后在适配器类中编写的代码

remove.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

notifyDataSetChanged();
            }
        });

我的完整适配器代码

import java.util.List;
import java.util.Objects;

import android.app.ProgressDialog;
import android.content.Context;
import android.graphics.Color;
import android.lotus.com.androidmis.R;
import android.os.AsyncTask;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

import com.lotus.mis.modle.Complaints.Complaint;
import com.lotus.mis.modle.MyAppApplication;
import com.subtabs.complaints.Complaints_pending;

import org.ksoap2.SoapEnvelope;
import org.ksoap2.serialization.SoapObject;
import org.ksoap2.serialization.SoapSerializationEnvelope;
import org.ksoap2.transport.HttpTransportSE;
import org.w3c.dom.Text;


public class Support_ComplainAdapter extends BaseAdapter {

    Context context;
    List<Complaint> objects;
    ProgressDialog progressdialog;
    String UserID;
    MyAppApplication mApp;

    public Support_ComplainAdapter(Context context,int resource,List<Complaint> objects)
    {
        this.context = context;
        this.objects = objects;
    }

    @Override
    public int getCount() {
        // TODO Auto-generated method stub

        return  objects.size();
    }

    @Override
    public Object getItem(int position) {
        // TODO Auto-generated method stub
        return objects.get(position);
    }

    @Override
    public long getItemId(int position) {
        // TODO Auto-generated method stub
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        // TODO Auto-generated method stub

    //  View POItemRow = inflater.inflate(R.layout.activity_poitem_listrow,parent,false);

        View PurchaseOrderRow = LayoutInflater.from(context).inflate(R.layout.layout_complaint_adapter,null);

        progressdialog = new ProgressDialog(context);
        if (position % 2 == 1) {
            PurchaseOrderRow.setBackgroundColor(Color.WHITE);  
        } else {
            PurchaseOrderRow.setBackgroundColor(Color.LTGRAY);  
        }
        mApp  = ((MyAppApplication)context.getApplicationContext());
        final Complaint TR = (Complaint)objects.get(position);

        final String RequestNO = TR.getTicketNo();
        final String reqID = TR.getComplaintID();

        Complaint Complaintlist = (Complaint) objects.get(position);

        //TextView txt_PONo = (TextView) PurchaseOrderRow.findViewById(R.id.txt_PONo);
        //TextView txt_SuppName = (TextView) PurchaseOrderRow.findViewById(R.id.txt_SuppName);
        TextView username = (TextView)PurchaseOrderRow.findViewById(R.id.txt_complaint_empname);
        username.setText(mApp.getmGlobal_UserName());
        TextView userid = (TextView)PurchaseOrderRow.findViewById(R.id.txt_complaint_userid);
        userid.setText(mApp.getmGlobal_UserID());
        TextView module_name  = (TextView)PurchaseOrderRow.findViewById(R.id.txt_module_name);
        module_name.setText(Complaintlist.getText2());
        TextView Ref_no = (TextView)PurchaseOrderRow.findViewById(R.id.txt_ref_no);
        Ref_no.setText(Complaintlist.getTicketNo());
        TextView created_by = (TextView)PurchaseOrderRow.findViewById(R.id.txt_created_by_complaint);
        created_by.setText(Complaintlist.getCreatedBy());
        TextView created_Date= (TextView)PurchaseOrderRow.findViewById(R.id.txt_created_date_complaint);
        created_Date.setText(Complaintlist.getCreatedDate());
        TextView complaint_sub = (TextView)PurchaseOrderRow.findViewById(R.id.txt_complaint_sub);
        complaint_sub.setText(Complaintlist.getComplaintName());
        TextView complaint_body = (TextView)PurchaseOrderRow.findViewById(R.id.txt_complaint_body);
        complaint_body.setText(Complaintlist.getText1());
        final Button chat_support = (Button)PurchaseOrderRow.findViewById(R.id.btn_chat_support);
        chat_support.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {


            }
        });

        final Button close_complaint = (Button)PurchaseOrderRow.findViewById(R.id.btn_close);
        close_complaint.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                new set_updateSupport().execute("UpdateValues", "1011",
                        reqID, "", "", "", "",
                        "", "","","","");


            }
        });

return PurchaseOrderRow;
    }

    class set_updateSupport extends AsyncTask<String, Integer, String> {

        private static final String NAME_SPACE = "http://tempuri.org/";
        private static final String URL = "http://192.168.1.106:99/Service.asmx";

        @Override
        protected void onPreExecute() {
            // TODO Auto-generated method stub
            super.onPreExecute();

            progressdialog.setMessage("Adding Sales Request");
            progressdialog.show();

        }

        @Override
        protected String doInBackground(String... params) {
            // TODO Auto-generated method stub
            String TempMethod = params[0];
            String Flag = params[1];
            String value1 = params[2];
            String value2 = params[3];
            String value3 = params[4];
            String value4 = params[5];
            String value5 = params[6];
            String value6 = params[7];
            String value7 = params[8];
            String value8 = params[9];
            String value9 = params[10];
            String value10 = params[11];

            try {
                SoapObject request = new SoapObject(NAME_SPACE, TempMethod);
                request.addProperty("Flag", Flag);
                request.addProperty("value1", value1);
                request.addProperty("value2", value2);
                request.addProperty("value3", value3);
                request.addProperty("value4", value4);
                request.addProperty("value5", value5);
                request.addProperty("value6", value6);
                request.addProperty("value7", value7);
                request.addProperty("value8", value8);
                request.addProperty("value9", value9);
                request.addProperty("value10", value10);

                SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(
                        SoapEnvelope.VER11);
                envelope.dotNet = true;
                envelope.setOutputSoapObject(request);
                HttpTransportSE Android_HttpTransport = new HttpTransportSE(URL);
                Android_HttpTransport.debug = true;
                Android_HttpTransport.call(NAME_SPACE + TempMethod, envelope);
                String responseXml = envelope.getResponse().toString();
                //  String responseXml = Android_HttpTransport.responseDump;
                Log.i("RITESH", "responseXml" + responseXml);
                return responseXml;
            } catch (Exception ex) {
                ex.printStackTrace();
            }

            return null;
        }

        @Override
        protected void onPostExecute(String result) {
            // TODO Auto-generated method stub
            // super.onPostExecute(result);

            progressdialog.dismiss();

            if (result == null) {
                Toast.makeText(context, "Error while reading data",
                        Toast.LENGTH_SHORT).show();
            } else if (result.equals("0")) {
                Toast.makeText(context, "No record for Update",
                        Toast.LENGTH_SHORT).show();
            } else if (result.equals("1")) {
                Toast.makeText(context, "Complain/Support Close Successfully", Toast.LENGTH_SHORT)
                        .show();

                notifyDataSetChanged();



            } else {
                Toast.makeText(context, "Not Updated result  " + result,
                        Toast.LENGTH_SHORT).show();
            }

        }

    }


}

Answer 1

我没有找到更改“列表对象”内容的代码。

你可以试试这个：

objects.clear();  
objects.addAll(query(......)); 
mAdapter.notifyDataSetChanged();