Android按字母顺序排序ListView

概述所以我正在尝试为ListView排序一个简单的ArrayAdapter.这是我尝试过的：ListViewlv;String[]months={"January","February","March","April","May","June",&quo

所以我正在尝试为ListVIEw排序一个简单的ArrayAdapter.这是我尝试过的：

ListVIEw lv;String[] months = {        "January",        "February",        "march",        "April",        "May",        "June",        "July",        "August",        "September",        "October",        "November",        "December"};ArrayAdapter<String> adapter;ArrayList<String> List;@OverrIDeprotected voID onCreate(Bundle savedInstanceState) {    super.onCreate(savedInstanceState);    setContentVIEw(R.layout.activity_main);    lv = (ListVIEw) findVIEwByID(R.ID.ListVIEw1);    lv.setFastScrollEnabled(true);    adapter = new ArrayAdapter<String>(this, androID.R.layout.simple_List_item_1, months);    lv.setAdapter(adapter);}@OverrIDepublic boolean onCreateOptionsMenu(Menu menu) {    // Inflate the menu; this adds items to the action bar if it is present.    getMenuInflater().inflate(R.menu.main, menu);    return true;}@OverrIDepublic boolean onoptionsItemSelected(MenuItem item) {    // Todo auto-generated method stub    switch (item.getItemID()) {        case R.ID.sortasc:            List = new ArrayList<String>(Arrays.asList(months));            Collections.sort(List);            for (int i = 0; i < List.size(); i++) {                System.out.println(List.get(i));            }            adapter.clear();            adapter = new ArrayAdapter<String>(this,                    androID.R.layout.simple_List_item_1, List);            adapter.notifyDataSetChanged();            return true;        case R.ID.sortdesc:            return true;        default:            return super.onoptionsItemSelected(item);    }}

但我得到UnsupportedOperationException,这有什么问题？我真的需要帮助.提前致谢！

解决方法:

在对项目进行排序后,您没有调用setAdapter(适配器).

使用如下

adapter = new ArrayAdapter<String>(this,                androID.R.layout.simple_List_item_1, List);lv.setAdapter(adapter);adapter.notifyDataSetChanged();

代替

adapter.clear(); // Useless adapter = new ArrayAdapter<String>(this,                androID.R.layout.simple_List_item_1, List);adapter.notifyDataSetChanged();

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