本代码主要功能
1、 向拉菜单 spinner添加数据
2、下拉菜单连动
以下是核心代码
//定义变量 private Spinner spinner3; private Spinner spinner4; private Map<String,List<String>> gaderMap=new HashMap<String, List<String>>(); private List<String> gader=new ArrayList<>(); private List<String> student1=new ArrayList<>(); private List<String> student2=new ArrayList<>(); private List<String> selectStudents=new ArrayList<>(); //绑定变量 spinner3=findViewById(R.id.Spinner03); spinner4=findViewById(R.id.Spinner04); //填充变量 gader.add("1班"); gader.add("2班"); student1.add("罗分明"); student1.add("lqwvje"); student2.add("www.luofenming.com"); student2.add("www.995w.com"); gaderMap.put(gader.get(0),student1); gaderMap.put(gader.get(1),student2); //事件 spinner3.setAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_dropdown_item_1line, android.R.id.text1, gader));//spinner3添加数据 final ArrayAdapter<String> selectAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_dropdown_item_1line, android.R.id.text1, selectStudents); spinner4.setAdapter(selectAdapter); spinner3.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {//选中项监听 @Override public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) { Toast.makeText(SpinnerTest.this, spinner3.getSelectedItem().toString(), Toast.LENGTH_SHORT).show(); selectStudents.clear();//清空集合内容 selectStudents.addAll(gaderMap.get(spinner3.getSelectedItem().toString()));//添加集合内容 selectAdapter.notifyDataSetChanged();//通知道适配器 } @Override public void onNothingSelected(AdapterView<?> adapterView) { } });