Question

需要从我的微调器workRequestType中选择的微调器加载信息。我现在开始在java android中编程，我不知道该怎么做这个程序。

我所做的研究，我需要使用setOnItemSelectedListener但不知道如何使用。我在哪里宣布这个过程？

我的java代码：

spnWorkRequesType.setOnItemSelectedListener(new OnItemSelectedListener() {

    @Override
    public void onItemSelected(AdapterView<?> arg0, View arg1, int arg2,
            long arg3) {

        String workRequestType = arg0.getItemAtPosition(arg2).toString();

        loadCustomServiceSpinner(workRequestType);
    }

    @Override
    public void onNothingSelected(AdapterView<?> arg0) {
        // TODO Auto-generated method stub

    }});

private void loadCustomServiceSpinner(String workRequestType) {

    CustomServiceDBQueries csQueries = new CustomServiceDBQueries();
    customService = csQueries.selectCustomService(workRequestType);

    String[] strCustomService = new String[customService.size() + 1];
    strCustomService[0] = "";

    int i = 1;
    for (CustomService cs : customService) {
        strCustomService[i] = cs.getCustomServiceName();
        i++;
    }

    ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
            android.R.layout.simple_spinner_item, strCustomService);
    adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

    Spinner SpnCustomService = (Spinner) findViewById(R.id.SpnCustomService);
    SpnCustomService.setAdapter(adapter);

}

谢谢！

Answer 1

您可以浏览此spinner tutorial 1和spinner tutorial 2。我认为这会让你对它的工作原理有所了解。

基本上，您需要将一个数组适配器设置为微调器以设置下拉列表。 onItemSelectedListener的onItemSelected方法为您提供从列表中选择的项目的索引。

Answer 2

我在OnCreate（）中声明了该方法并且它有效。谢谢大家的帮助！

spnWorkRequesType
            .setOnItemSelectedListener(new OnItemSelectedListener() {

                @Override
                public void onItemSelected(AdapterView<?> arg0, View arg1,
                        int pos, long id) {

                    String workRequestType = arg0.getItemAtPosition(pos)
                            .toString();

                    if (pos != 0)
                        Toast.makeText(WorkOrderOpen.this, workRequestType,
                                Toast.LENGTH_LONG).show();
                }

                @Override
                public void onNothingSelected(AdapterView<?> arg0) {
                    // TODO Auto-generated method stub

                }
            });

使用事件setOnItemSelectedListener的微调器

2 个答案: