Android：在整数微调器中设置所选项目的问题

Question

final Spinner spinner = (Spinner)findViewById(R.id.spinnerNumber);
        List<Integer> list = new ArrayList<>();
        for (int j = 0; j < 51; j++) {
            list.add(j);
        }

        ArrayAdapter<Integer> dataAdapter = new ArrayAdapter<>(this, android.R.layout.simple_spinner_item, list);
        dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
        spinner.setAdapter(dataAdapter);

我想在此微调器中设置一个选定的项目。通常我会在spinner.setSelection()内setSelection()插入我想要设置的元素的位置。这次我放在setSelection()内的所有东西都没有产生任何效果，我的微调器仍然设置为0 ......我错过了什么？

Answer 1

尝试这个

Spinner spinner = (Spinner)findViewById(R.id.spinnerNumber);
    final List<Integer> list = new ArrayList<Integer>();
    for (int j = 0; j < 51; j++) {
        list.add(j);
    }

    ArrayAdapter<Integer> dataAdapter = new ArrayAdapter<Integer>(this, android.R.layout.simple_spinner_item, list);
    dataAdapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    spinner.setAdapter(dataAdapter);
    spinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
        @Override
        public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
            System.out.println("Selected item :: "+list.get(position));
            System.out.println("Selected item Pos :: "+position);
        }

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

        }
    });

Answer 2

这将有效

 int spinnerPosition = adapter.getPosition(yourStringValue);
 mSpinner.setSelection(spinnerPosition);