Question

我有一个自定义对话框，它会在点击listview的行时显示。数据将显示在web服务的customdialogbox上。现在，如果我错误地点击两次，自定义对话框打开两次。我的自定义对话框是在Async类中，我在onPostexecute()上调用它。

每次我点击listview行时，都应该调用Async类，其中有自定义对话框。

如何避免两次打开？

请帮忙。

我已经检查了一些其他条件，但它对我不起作用。

    public void showCustomDialog() {  // this is the dialog box i have created
            // TODO Auto-generated method stub
             final Dialog dialog = new Dialog(context);
            final List<String> list=new ArrayList<String>();
            list.add("Low");
            list.add("Normal");
            list.add("High");

            dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
            dialog.setContentView(R.layout.customdialoguniversalappointment);
            final ListView listcustomuniversalappt=(ListView) dialog.findViewById(R.id.listcustomuniversalappt);

            LinearLayout layoutsubject=(LinearLayout) dialog.findViewById(R.id.layoutsubject);
            LinearLayout layoutappt=(LinearLayout) dialog.findViewById(R.id.layoutappt);
            Spinner spinnerappt=(Spinner)dialog.findViewById(R.id.permissionspinner);

            ImageView cancel=(ImageView)dialog.findViewById(R.id.imgcancel);
            Button cancelappt=(Button)dialog.findViewById(R.id.btncancelappt);
            Button confirmappt=(Button)dialog.findViewById(R.id.btnconfirmappt); 
            EditText subject=(EditText) dialog.findViewById(R.id.edtsubject);
                  subject.setText("Appointment"); 


                  TextView txtdateslot=(TextView) dialog.findViewById(R.id.txtdateslot);
                txtdateslot.setText("Date:"+DoctorAppointmentAPTrequest.universalapt_date+" Time Slot:"+DoctorAppointmentAPTrequest.universalslot_time);      



            ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(context,
                    android.R.layout.simple_spinner_item, list);
                dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
                spinnerappt.setAdapter(dataAdapter);

                spinnerappt.setOnItemSelectedListener(new OnItemSelectedListener() {

                    @Override
                    public void onItemSelected(AdapterView<?> arg0, View arg1,
                            int arg2, long arg3) {
                        // TODO Auto-generated method stub
                        int index = arg0.getSelectedItemPosition();
                     selected_item=arg0.getItemAtPosition(arg2).toString();



                    }

                    @Override
                    public void onNothingSelected(AdapterView<?> arg0) {
                        // TODO Auto-generated method stub

                    } 
                });  

                 System.out.println("APTCustomRequestResponse.runcustomuniversalappdata="+run_custom_universal_apptdata());
            APTRequestCustomAdapter adap=new APTRequestCustomAdapter(context,run_custom_universal_apptdata());
                listcustomuniversalappt.setAdapter(adap);



            cancel.setOnClickListener(new OnClickListener() {

                @Override
                public void onClick(View v) {
                    // TODO Auto-generated method stub
                    dialog.dismiss();
                    System.out.println("hello");
                }
            });

            cancelappt.setOnClickListener(new OnClickListener() {

                @Override
                public void onClick(View v) {
                    // TODO Auto-generated method stub
                    dialog.dismiss();
                }  
            });
          //confirm appt
            confirmappt.setOnClickListener(new OnClickListener() {

                @Override
                public void onClick(View v) {
                    // TODO Auto-generated method stub
                    if(APT_CustomRequestResponse.radiostring.equals("checked")){
                        showdialogforconfirmappointment();  
                    }else{
                        Toast.makeText(context, "Please Select a Patient to book a Appointment",2000).show();
                    }

                } 
            });

            getsubject=subject.getText().toString();
            if(!dialog.isShowing()||dialog==null){//here i am checking condition where it should appear or not
            dialog.show();

            System.out.println(isMatch);
            }else{
                dialog.dismiss();
            }
        }

并在onPost方法中调用它：

 public class APT_CustomRequestResponse extends AsyncTask<String,String,String>{   
    protected void onPostExecute(String result) {
            // TODO Auto-generated method stub
            super.onPostExecute(result);
               showCustomDialog();//here i am calling custom dialog box

   @Override
    protected String doInBackground(String... params) {
        String hunt= GetAPT_RequestCustomdata();
        return hunt;
    }       

        }  
 }

这个异步类我在其他类中调用我的实际列表视图：

listview.setOnItemClickListener(new OnItemClickListener() {

            @Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,long arg3) {
    APT_CustomRequestResponse APT=new APT_CustomRequestResponse(MainActivity.this);
            APT.execute();

Answer 1

 Use below provided code for reference toward solving this issue.

 // Keep this as member variable to the class
 final Dialog dialog = new Dialog(context);

 // your new method model
 public void showCustomDialog() { 
     // Here check this
     if(dialog != null && dialog.isShowing()){
         // Decide if you want to display a new one, if yes then write below code first
         dialog.dismiss();
         dialog = null;

         // Display a new dialog code here
     }else{
         // Dialog is no visible, diaply it here
     }

 }

Answer 2

如果任务已经在ListView行上运行，请尝试避免两次调用showCustomDialog()方法，而不是尝试避免再次启动AsyncTask。您可以使用AsyncTask.Status执行此操作：

 public boolean isfirsttimeclick=true;

    @Override
     public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
                        long arg3) {

      APT_CustomRequestResponse APT=new APT_CustomRequestResponse(MainActivity.this); 
      if(isfirsttimeclick || APT.getStatus() == AsyncTask.Status.FINISHED){
           APT.execute();

      }else{
             /// show message to user already running
        }

    }

Answer 3

单击两次项目时，不应向服务器发送请求。

在发送第一个请求时显示一个进度对话框，阻止用户再次点击列表项。

或者签入onItem点击就像@ρяσѕρєяK表示只是添加到使用下面的代码定义onTtemClick之外的APT_CustomRequestResponse对象和你的活动：

活动：

APT_CustomRequestResponse APT=null;

onItemClick：

@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
                    long arg3) {
if(MainActivity.this.APT==null||MainActivity.this.APT.getStatus() == AsyncTask.Status.FINISHED){
   MainActivity.this.APT=new APT_CustomRequestResponse(MainActivity.this); 
   MainActivity.this.APT.execute();
}


}

修改

在您的异步任务中创建一个布尔值以了解执行是否完成：

boolean finished=false;

在post执行中将其设置为true：

finished=true;

最后在onItemClick中执行此操作：

@Override public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) { if(MainActivity.this.APT==null||MainActivity.this.APT.finished){ MainActivity.this.APT=new APT_CustomRequestResponse(MainActivity.this); MainActivity.this.APT.execute(); } }

防止额外点击自定义对话框

3 个答案: