Question

我正在尝试使用添加按钮在回收站视图中添加序列号。需要检查是否尝试在回收者视图中添加重复值。

添加按钮Onclick侦听器代码如下

 serialNumberAddButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if (!serialNumberField.getText().toString().equals("")) {

            // here need to check the duplicate values

                SerialNumberPojo serialNumberPojo = new SerialNumberPojo(serialNumberField.getText().toString());
                serialNumberPojoList.add(serialNumberPojo);

                RecyclerView recyclerView = view.findViewById(R.id.serial_recycle);
                serialNumberAdapter = new SerialNumberAdapter(serialNumberPojoList, view.getContext(), ScannedDetailsFragment.this);

                actualQuantity.setText(String.valueOf(serialNumberAdapter.getItemCount()));
                mLayoutManager = new LinearLayoutManager(view.getContext());
                recyclerView.setLayoutManager(mLayoutManager);
                recyclerView.setItemAnimator(new DefaultItemAnimator());
                recyclerView.setHasFixedSize(true);
                recyclerView.setAdapter(serialNumberAdapter);
                serialNumberAdapter.notifyDataSetChanged();



            } else {
                messageDialog.showAlertDialogBox(getContext(), "Add or Scan Serial Number", "error");
            }
        }
    });

Answer 1

您可以执行以下操作：

SerialNumberPojo serialNumberPojo = new SerialNumberPojo(serialNumberField.getText().toString());
if (!serialNumberPojoList.contains(serialNumberPojo)) {
    serialNumberPojoList.add(serialNumberPojo);
}

在SerialNumberPojo中，您需要实现自己的equals（），如：

@Override
public boolean equals(Object other) {
    if (this == other) return true;
    if (other == null || getClass() != other.getClass()) return false;

    SerialNumberPojo  that = (SerialNumberPojo) other;

    if (getId() != null && getId().equals(that.getId())) {
        return true;
    }

    return false;
}

Answer 2

您可以在onCreate函数中初始化回收视图。喜欢：

@Override
public void onCreate(...) {
    ...
    recyclerView = findViewById(R.id.serial_recycle);
    serialNumberAdapter = new SerialNumberAdapter(serialNumberPojoList, view.getContext(), ScannedDetailsFragment.this);
    mLayoutManager = new LinearLayoutManager(view.getContext());
    recyclerView.setLayoutManager(mLayoutManager);
    recyclerView.setItemAnimator(new DefaultItemAnimator());
    recyclerView.setHasFixedSize(true);
    recyclerView.setAdapter(serialNumberAdapter);
    ...
}

，然后在您的OnClickListener中检查是否有重复，写为@Szymon Chaber

serialNumberAddButton.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {
        if (!serialNumberField.getText().toString().equals("")) {
            SerialNumberPojo serialNumberPojo = new SerialNumberPojo(serialNumberField.getText().toString());
            if (!serialNumberPojoList.contains(serialNumberPojo)) {
                serialNumberPojoList.add(serialNumberPojo);
            } else {
                // your action if found duplicate value 
            }
            serialNumberAdapter.updateData(serialNumberPojoList);
            serialNumberAdapter.notifyDataSetChanged();
            actualQuantity.setText(String.valueOf(serialNumberAdapter.getItemCount()));
        } else {
            messageDialog.showAlertDialogBox(getContext(), "Add or Scan Serial Number", "error");
        }
    }
});

验证RecyclerView中的重复条目

2 个答案: