android 字母排序i,Android按字母顺序排序ListView

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 adapter;

ArrayList list;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

lv = (ListView) findViewById(R.id.listView1);

lv.setFastScrollEnabled(true);

adapter = new ArrayAdapter(this, android.R.layout.simple_list_item_1, months);

lv.setAdapter(adapter);

}

@Override

public 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;

}

@Override

public boolean onOptionsItemSelected(MenuItem item) {

// TODO Auto-generated method stub

switch (item.getItemId()) {

case R.id.sortasc:

list = new ArrayList(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(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！