在Android中更新ListView项的值

Question

我有一个列表视图显示一个列表。所以在ListView的点击我有一个customDialog.In。我从用户采取一些值。所以希望一旦用户输入详细信息并单击确定按钮，然后我必须从列表视图中更新该项目的值，并且当列表视图的所有项目都已更新后，将其与之前的值进行比较以检查所有项目是否已更新或不能。帮助我在这我怎么能做到这一点

活动代码

protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     requestWindowFeature(Window.FEATURE_NO_TITLE); 
     setContentView(R.layout.activity_iween_booking_page); 
     intent = getIntent(); 
     isReturn = (Boolean) intent.getExtras().get("isReturn"); 
     searchParam = (HashMap<String,String>) intent.getExtras().get("searchParam"); 
     listView = (ListView) findViewById(R.id.passengerList); 
     emailId = (TextView)findViewById(R.id.emailid); 
     continuebooking = (ImageView)findViewById(R.id.continuebooking); 
     firstName= (EditText)findViewById(R.id.firstName); 
     lastName =(EditText)findViewById(R.id.LastName); 
     mobileNumber =(EditText)findViewById(R.id.mobileNumber); 


     setTittle(); 
     if(searchParam.get("NoOfChild").equals("0") && searchParam.get("NoOfInfant").equals("0")&& searchParam.get("NoOfAdult").equals("1")){ 

     } else { 


      passengerList = getPassengerList(passengerInfo); 
      showPassengerListView(passengerList); 

     } 

     continuebooking.setOnClickListener(new OnClickListener() { 
      @Override 
      public void onClick(View arg0) { 
       if(searchParam.get("NoOfChild").equals("0") && searchParam.get("NoOfInfant").equals("0") && searchParam.get("NoOfAdult").equals("1")){ 
        if(firstName.getText().toString().trim().equalsIgnoreCase("")){ 
         firstName.setError("Enter FirstName"); 
        } 
        if(lastName.getText().toString().trim().equalsIgnoreCase("")){ 
         lastName.setError("Enter LastName"); 
        } 
        if(mobileNumber.getText().toString().trim().equalsIgnoreCase("")){ 
         mobileNumber.setError("Enter Mobile No."); 
        } 
       }else{ 
        int count = listView.getAdapter().getCount(); 
        listData = new String[count]; 
        for (int i = 0; i < count; i++) { 
          listData[i] = listView.getAdapter().getItem(i).toString(); 

        } 
        for(int i=0;i<listView.getAdapter().getCount();i++){ 
         for(int j=0;j<count;j++){ 
          if(listData[j]==listView.getAdapter().getItem(i).toString()){ 
           Log.d("listData data", listView.getAdapter().getItem(i).toString()); 
//        View v=listView.getChildAt(i); 
//        TextView tv=(TextView) v.findViewById(android.R.id.text1); 
//        tv.setError("Please change the data"); 
           } 
         } 
        } 
        } 


      } 
     }); 



    } 



    private void showPassengerListView(final String[] passengerList) { 
     adapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1, android.R.id.text1, passengerList); 
     listView.setAdapter(adapter); 
     listView.setOnItemClickListener(new OnItemClickListener() { 
      @Override 
      public void onItemClick(AdapterView<?> parent, View view, 
        int position, long id) { 
//    int itemPosition  = position; 
//    String itemValue = (String) listView.getItemAtPosition(position); 
       View v=listView.getChildAt(position); 
       TextView tv=(TextView) v.findViewById(android.R.id.text1); 
       tv.setError(null); 
       passengerInformationPopup(passengerList,position); 
      } 
     }); 
    } 






    public void passengerInformationPopup(final String[] passengerList, final int position) { 
     final Dialog dialog= new Dialog(Test.this,R.style.Dialog_Fullscreen); 
     dialog.setContentView(R.layout.passenger_details_dialog); 


     final EditText firstNameDialog; 
     final EditText lastNameDialog; 
     ImageView continueBooking; 
     dateofBirth = (TextView)dialog.findViewById(R.id.dateofBirth); 
     firstNameDialog = (EditText)dialog.findViewById(R.id.firstName); 
     lastNameDialog =(EditText)dialog.findViewById(R.id.LastName); 
     continueBooking =(ImageView)dialog.findViewById(R.id.continuebooking); 
     if((passengerList[position].contains("Child"))|| (passengerList[position].contains("Infant"))){ 
      dateofBirth.setVisibility(View.VISIBLE); 
     }else{ 
       dateofBirth.setVisibility(View.GONE); 
     } 
     dateofBirth.setClickable(true); 
     dialog.show(); 

     continueBooking.setOnClickListener(new OnClickListener() { 
      @Override 
      public void onClick(View arg0) { 
       isSuccess= true; 
       if(firstNameDialog.getText().toString().trim().equalsIgnoreCase("")){ 
        firstNameDialog.setError("Enter FirstName"); 
        isSuccess= false; 
       } 
       if(lastNameDialog.getText().toString().trim().equalsIgnoreCase("")){ 
        lastNameDialog.setError("Enter LastName"); 
        isSuccess= false; 
       } 
       if((passengerList[position].contains("Child"))|| (passengerList[position].contains("Infant"))){ 
        if(dateofBirth.getText().toString().trim().equalsIgnoreCase("")){ 
         dateofBirth.setError("Date of Birth Can't be blank"); 
         isSuccess= false; 
        } 
       } 
       if(isSuccess){ 
        dialog.cancel(); 
        View v=listView.getChildAt(position); 
        TextView tv= (TextView) v.findViewById(android.R.id.text1); 
        tv.setText(firstNameDialog.getText().toString().trim().toString()+" "+lastNameDialog.getText().toString().trim().toString()); 


       } 
      } 
     }); 

    } 

passen gerInformationPopup功能我要更新ListView的。在对创建continueBooking我有项目价值，检查所有的项目是否被更新或不

Before Updation After Updation

Answer 1

不要直接更新ListView项目。更新存储器中的数据并在适配器上拨打notifyDataSetChanged。

Answer 2

您将需要一个ArrayAdapter与您的列表的数据。然后，当您操作该数组中的数据时，您可以在adabter上调用.notifyDataSetChanged();来刷新您的视图。 请注意它必须是相同的数组列表！所以你不能打电话arraylist = new ArrayList();这会破坏参考。而是使用arraylist.clear();然后arraylist.addAll(data);

下面是一个例子：

public class GroupsListAdapter extends ArrayAdapter<Object> { 

    /** 
    * Constructor 
    * 
    * @param context 
    *   Context 
    * @param objects 
    *   Array of objects to show in the list. 
    */ 
    public GroupsListAdapter(Context context, ArrayList<Object> objects) { 
     super(context, R.layout.row, objects); 
    } 

    @Override 
    public View getView(int position, View convertView, ViewGroup parent) { 

     Object = getItem(position); 

     /* Initialize strings */ 
     String nameText = group.getName(); 
     boolean upToDate = group.isUpToDate(); 

     /* Get the layout for the list rows */ 
     View rowView = convertView; 
     if (rowView == null) { 
      LayoutInflater inflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
      rowView = inflater.inflate(R.layout.row, parent, false); 
     } 
      rowView.setOnClickListener(new OnClickListener() { 

      public void onClick(View v) { 
         //do stuff here 
        } 
      }); 


     return rowView; 
    } 
}