即使未选择项目 OnItemSelected 也会在 Spinner 中被触发

Question

我有以下微调器代码。我没有收到任何错误，微调器正在工作，但我遇到了这个问题，即使我没有 selected 任何项目，onItemSelected 侦听器中的代码正在执行，但我不希望这种情况发生n 直到我 select 和微调器中的项目。请任何人告诉我为什么会这样。非常感谢。欢迎所有建议。提前致谢。

我的旋转器代码：

SQLiteDataBaseAdapter adapter = new SQLiteDataBaseAdapter(this);

        Cursor cursor = adapter.getAllSubTaskData();

        // Log.d("Pana", "The value of cursor is " +Integer.parseInt(String.valueOf(cursor.toString())));

        String[] fromFieldNames = new String[]{SQLiteHelper.UID, SQLiteHelper.SUB_TASK_NAME};
        int[] toViewIds = new int[]{R.id.textViewUID, R.id.textViewSubTaskName};

        SimpleCursorAdapter myCursorAdapter;
        myCursorAdapter = new SimpleCursorAdapter(getBaseContext(), R.layout.custom_spinner_subtask_row, cursor, fromFieldNames, toViewIds, 0);

        subTaskList.setAdapter(myCursorAdapter);


        subTaskList.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {


                Toast.makeText(view.getContext(), "The position of the item clicked is " + position, Toast.LENGTH_LONG).show();

                SharedPreferences sharedPreferences = getSharedPreferences("MyData1", Context.MODE_PRIVATE);
                SharedPreferences.Editor editor = sharedPreferences.edit();
                editor.putString("position", Long.toString(id));
                editor.commit();



                Intent intent = new Intent();
                intent.setClass(getApplicationContext(), SubTaskDetail.class);
                intent.putExtra("position", Long.toString(id));  //position starts from 0, but in db row starts from 1
                startActivity(intent);


            }

            @Override
            public void onNothingSelected(AdapterView<?> parent) {

            }
        });

我在 activity.

的 onCreate() 方法中编写的微调器的完整代码

Answer 1

这是微调器的默认功能。当适配器绑定到 Spinner 时，Spinner 将 select 排在第 0 个位置

如果你真的想在初始化时阻止它，那么在 onitemselected

中以这种方式进行

check=check+1 
if(check>1) {
    // put your code
    }

即使未选择项目 OnItemSelected 也会在 Spinner 中被触发

Even though item is not selected OnItemSelected is getting triggered in Spinner

android

android-spinner