如何使用ListActivity中自带的ListView

package com.broadvision.clearvale; import android.app.ListActivity; import android.os.Bundle; import android.view.View; import android.widget.ArrayAdapter; import android.widget.ListView; public class ListviewActivity extends ListActivity { private ListView listView; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); listView = this.getListView(); // listView.setChoiceMode(ListView.CHOICE_MODE_NONE); // listView.setChoiceMode(ListView.CHOICE_MODE_SINGLE); listView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE); listView.setTextFilterEnabled(true); this.setListAdapter(new ArrayAdapter<String>(this, android.R.layout.simple_list_item_checked, this.getResources() .getStringArray(R.array.presidents_array))); } public void onClick(View view) { String itemsSelected = "Selected items: \n"; for (int i = 0; i < listView.getCount(); i++) { if (listView.isItemChecked(i)) { itemsSelected += listView.getItemAtPosition(i) + "\n"; } } System.out.println(itemsSelected); } }