Spinner用法

private static final String[] spinner_arr1 = {"大一", "大二", "大三", "大四"};
    private static final String[] spinner_arr2 = {"计算机科学与技术", "网络工程", "软件工程", "信息安全"};
 ArrayAdapter adapter;
    ArrayAdapter adapter1;
    Context context = AddStudent.this;
    private Spinner grade_spinner;
    private Spinner major_spinner;

 private void iniSpinner() {
        grade_spinner.setAdapter(adapter);
        major_spinner.setAdapter(adapter1);
        grade_spinner.setOnItemSelectedListener(new Spinner.OnItemSelectedListener() {
            public void onItemSelected(AdapterView arg0, View arg1, int arg2, long arg3) {
                //Toast("选择的是"+spinner_arr1[arg2]);
                arg0.setVisibility(View.VISIBLE);
                student.setGrade(spinner_arr1[arg2]);
            }

            public void onNothingSelected(AdapterView arg0) {
                Toast("没有选择");
            }
        });
        major_spinner.setOnItemSelectedListener(new Spinner.OnItemSelectedListener() {
            @Override
            public void onItemSelected(AdapterView parent, View view, int position, long id) {
                //Toast("选择的是"+spinner_arr2[position]);
                parent.setVisibility(View.VISIBLE);
                student.setMajor(spinner_arr2[position]);
            }

            @Override
            public void onNothingSelected(AdapterView parent) {
                Toast("没有选择");
            }
        });
    }

顺便封装了一下Toast

    public void Toast(String mess) {
        Toast.makeText(this, mess, Toast.LENGTH_SHORT).show();
    }

还有Adapter的自定义

 private void iniAdapter() {
        adapter = new ArrayAdapter(this, R.layout.simple_spinner_item, spinner_arr1);
        adapter1 = new ArrayAdapter(this, R.layout.simple_spinner_item, spinner_arr2);
        ((ArrayAdapter) adapter).setDropDownViewResource(R.layout.support_simple_spinner_dropdown_item);
        ((ArrayAdapter) adapter1).setDropDownViewResource(R.layout.support_simple_spinner_dropdown_item);
    }

一般会找不到那个simple_spinner_item,所以还要有一个item布局,来layout里新建一个simple_spinner_item.xml

顺便说一下Spinner的修改默认选定第几项:

        grade_spinner.setSelection(selection);