我使用了3个TAB请求，到达并离开并使用了arrayadapter列表视图，我在列表视图中添加了两个按钮，当我点击数据库值更新的按钮刷新当前页面中显示的值时，帮帮我.. {{3 }}
我的代码是。
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：
public class MyListviewAdapter extends ArrayAdapter<VisitorListItems> {
ArrayList<VisitorListItems> visitorlist=new ArrayList<>();
String RegIdno;
private Button btnallow;
private Button btndeny;
private ProgressDialog pbd;
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);
TextView txtWhomtomeet = (TextView) v.findViewById(R.id.txtWhomtomeet);
TextView txtdate=(TextView)v.findViewById(R.id.txtdate);
TextView txttimein=(TextView)v.findViewById(R.id.txttimein);
final TextView txtregidno=(TextView)v.findViewById(R.id.txtregidno);
TextView 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();
MyListviewAdapter myAdapter=new MyListviewAdapter(getContext(),R.layout.registrationlisttemplate,visitorlist);
myAdapter.notifyDataSetChanged();
}
}
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();
}
}
}
访客列表代码：
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 = "Visitor Success";
}
} catch (Exception ex) {
z = "Error retrieving data from table";
}
return z;
}
}
}
答案 0 :(得分：0)
在Fragment的onResume（）方法中从数据库中获取数据。然后它将是刷新的数据。