Question

我是android新手。当我在列表视图中向编辑文本插入值时，它会在滚动时获得重复项。我到处搜索，但我找不到确切的解决方案。我的列表视图非常大，因为它从数据库中获取值。这是我的android代码

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.orders);
    list = (ListView)findViewById(R.id.list1);
     this.getWindow().setSoftInputMode(WindowManager.LayoutParams.SOFT_INPUT_STATE_ALWAYS_HIDDEN);

    SelectItems();
    ViewItems();        
     cases = (EditText)findViewById(R.id.cases);
      pcs = (EditText)findViewById(R.id.pcs);
    clear1=(Button)findViewById(R.id.clear2);
    cout1=(Button)findViewById(R.id.cout2);

    clear1.setOnClickListener(this);
    cout1.setOnClickListener(this);

}

private void SelectItems() {
    // TODO Auto-generated method stub
    try {

           datas = new ArrayList<Map<String, String>>();
        DatabaseHelper dbHelper = new DatabaseHelper(this.getApplicationContext());
        newDB = dbHelper.getWritableDatabase();
        Cursor c = newDB.rawQuery("select distinct im_code ,im_desc ,im_srp "
                + " from itemmaster", null);

        Log.v("item detailss", c.toString());

            while (c.moveToNext()){

            HashMap<String, String> datanums = new HashMap<String, String>();
            String im_code = c.getString(c.getColumnIndex("im_code"));

             String desc = c.getString(c.getColumnIndex("im_desc"));

             datanums.put("code", im_code);
             datanums.put("name", desc);
                       String price = c.getString(c.getColumnIndex("im_srp"));
            datanums.put("ims", price);

            datas.add(datanums);

            }
        } catch (SQLiteException se ) {
            Log.e(getClass().getSimpleName(), "Could not create or Open the database");
           } 

}

private void ViewItems() {
    // TODO Auto-generated method stub
    list.setAdapter(null);
    String[] fromwhere = { "code","name","ims" };
    int[] viewswhere = { R.id.code,R.id.name,R.id.srp};

          ADAhere = new SimpleAdapter(Orders.this, datas,
            R.layout.order_simple_row, fromwhere, viewswhere);
    list.setAdapter(ADAhere);
    }



@Override
public void onClick(View v) {
    // TODO Auto-generated method stub
       switch (v.getId()) {

        case R.id.clear2:
           Intent i= new Intent(getApplicationContext(),Orders.class);
            startActivity(i);
            break;  

        case R.id.cout2:
              Checkout(v);

                break;

        default:
            break;
        }

}
private void Checkout(View view) {
// TODO Auto-generated method stub
     AlertDialog.Builder alertDialou = new AlertDialog.Builder(Orders.this);
     alertDialou.setMessage("DO YOU WANT TO CHECKOUT ?");


     alertDialou.setPositiveButton("YES", new DialogInterface.OnClickListener() {

        @Override
        public void onClick(DialogInterface dialog, int id) {
            getcases();
            invoiceAlert();


        }


        private void invoiceAlert() {
            // TODO Auto-generated method stub
            AlertDialog.Builder alertDialo = new AlertDialog.Builder(Orders.this);
             alertDialo.setMessage("ORDER SUCCESS..");
             alertDialo.setPositiveButton("Ok", new DialogInterface.OnClickListener() {

                @Override
                public void onClick(DialogInterface dialog, int which) {
                    // TODO Auto-generated method stub
                    //Orderheader();
                    printAlert();
                }



                private void printAlert() {
                    // TODO Auto-generated method stub
                    AlertDialog.Builder alertDial = new AlertDialog.Builder(Orders.this);
                     alertDial.setMessage("DO YOU WANT TO PRINT NOW ?");
                     alertDial.setPositiveButton("YES", new DialogInterface.OnClickListener() {

                        @Override
                        public void onClick(DialogInterface dialog, int id) {
                            // TODO Auto-generated method stub
                            Intent in = new Intent(Orders.this,Menu_iem.class);

                            startActivity(in);
                        }
                    });
                     alertDial.setNegativeButton("LATER", new DialogInterface.OnClickListener() {

                        @Override
                        public void onClick(DialogInterface dialog, int id) {
                            // TODO Auto-generated method stub

                        dialog.cancel();
                        }
                    });
                     AlertDialog alertDialog = alertDial.create();

                      // show alert

                      alertDialog.show();
                }
            });
             AlertDialog alertDialog = alertDialo.create();

              // show alert

              alertDialog.show();
        }

    });

 alertDialou.setNegativeButton("No", new DialogInterface.OnClickListener() {

   @Override
     public void onClick(DialogInterface dialog, int which) {
    // TODO Auto-generated method stub
    Intent in= new Intent(Orders.this,Orders.class);
    startActivity(in);
    }
 });         
 AlertDialog alertDialog = alertDialou.create();

// show alert

 alertDialog.show();    
 }

  protected void getcases() {
// TODO Auto-generated method stub
 DatabaseHelper databasecontroller = new DatabaseHelper(Orders.this);
List<Map<String, String>> data = null;
data = new ArrayList<Map<String, String>>();
float srps = (float) 0.0;
int qtys = 0;
databas.put("imuom", "CASES");


 if(list != null){

        for(int i = 0; i< list.getChildCount();i++){

            View vie = list.getChildAt(i);

            EditText ed1= (EditText) vie.findViewById(R.id.cases);
                String cases1 = ed1.getText().toString();

                databas.put("A",ed1.getText().toString());

      EditText ed2= (EditText) vie.findViewById(R.id.piece);
                String cases2 = ed2.getText().toString();

                databas.put("B",ed1.getText().toString());    
 data.add(databas);
 databasecontroller.inserttable(databas);
   }
   }

请帮助我。

Answer 1

尝试在适配器类的getview方法中设置标记，并发布适配器类的代码，这样我们可以提供更好的帮助。

if (convertView == null) {
            convertView = inflater.inflate(R.layout.simple_store_item, parent, false);
            mViewHolder = new CustomViewHolder(convertView);
            convertView.setTag(mViewHolder);
        } else {
            mViewHolder = (CustomViewHolder) convertView.getTag();
        }

Answer 2

将这两个方法添加到listview适配器类

@Override
        public int getItemViewType(int position) {
            return position;
        }

        @Override
        public int getViewTypeCount() {
            return getCount();
        }

Answer 3

Android视图中的Listview重用项目，因此如果用户滚动视图，某些视图会重复使用旧视图，如果您不仔细管理，它应显示重复值。如果您的行视图中有很多项，则应检查条件以正确显示视图。例如：

if(true){
    edt.setText("abc");
}else{
    edt.setText("cde");
}

如果您在每种情况下显示数据，则必须设置值或重置该视图以防无法使用

滚动时在列表视图中编辑文本值重复项

3 个答案: