Android中Spinner二级联动动态加载数据

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最近在做一个项目中用到了两个Spinner，我觉得这样写起来更简单。

xml文件：

<Spinner
android:layout_width="match_parent"
android:layout_height="40dp"
android:id="@+id/xxjk_fl_sp"
/>

<Spinner
android:layout_width="match_parent"
android:layout_height="40dp"
android:id="@+id/xxjk_rw_sp"
/>

item：

<TextView xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="50dp"
android:text="gagaf"
android:gravity="center"
>

代码：

public class XxjkFragment extends Fragment {

private View view;
private Spinner xxjk_fl_sp;
private Spinner xxjk_rw_sp;
private ArrayList<ArrayList<String>> arrayList = new ArrayList<>();
private List<String> list = new ArrayList<>();
private List<String> list1 = new ArrayList<>();
private List<String> list2 = new ArrayList<>();
private List<String> list3 = new ArrayList<>();

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

view = inflater.inflate(R.layout.fragment_xxjk,null);

initView();

initData();

listen();

return view;
}

private void listen() {

xxjk_fl_sp.setAdapter(new ArrayAdapter<String>(getActivity(),R.layout.item,list));

xxjk_fl_sp.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
xxjk_rw_sp.setAdapter(new ArrayAdapter<String>(getActivity(),R.layout.item,arrayList.get(position)));
}

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

}
});

}

private void initView() {
xxjk_fl_sp = ((Spinner) view.findViewById(R.id.xxjk_fl_sp));
xxjk_rw_sp = ((Spinner) view.findViewById(R.id.xxjk_rw_sp));
}

private void initData() {
list.add("北京");
list.add("河北");
list.add("数字");

list1.add("海淀");
list1.add("朝阳");
list1.add("昌平");

list2.add("张家口");
list2.add("保定");
list2.add("石家庄");

list3.add("123");
list3.add("456");
list3.add("789");

arrayList.add((ArrayList<String>) list1);
arrayList.add((ArrayList<String>) list2);
arrayList.add((ArrayList<String>) list3);

}

}

我写在了fragment里边，在activity中也一样。