ListActivity 实例

[android]代码库

import android.app.ListActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.Toast;

/**
 * ListActivity 实例
 */
public class EX04_20 extends ListActivity {
	private int selectedItem = -1;
	private String[] mString;
	static final private int MENU_LIST1 = Menu.FIRST;
	static final private int MENU_LIST2 = Menu.FIRST + 1;
	private ArrayAdapter<String> mla;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		// TODO Auto-generated method stub
		super.onCreate(savedInstanceState);
	}

	@Override
	protected void onListItemClick(ListView l, View v, int position, long id) {
		// TODO Auto-generated method stub
		selectedItem = position;
		Toast.makeText(EX04_20.this, mString[selectedItem], Toast.LENGTH_SHORT)
				.show();
		super.onListItemClick(l, v, position, id);
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// TODO Auto-generated method stub
		/* menu群组ID */
		int idGroup1 = 0;
		/* The order position of the item */
		int orderMenuItem1 = Menu.NONE;
		int orderMenuItem2 = Menu.NONE + 1;
		menu.add(idGroup1, MENU_LIST1, orderMenuItem1, R.string.str_menu_list1);
		menu.add(idGroup1, MENU_LIST2, orderMenuItem2, R.string.str_menu_list2);
		return super.onCreateOptionsMenu(menu);
	}

	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
		// TODO Auto-generated method stub
		switch (item.getItemId()) {
		case (MENU_LIST1):
			mString = new String[] {
					getResources().getString(R.string.str_list1),
					getResources().getString(R.string.str_list2),
					getResources().getString(R.string.str_list3),
					getResources().getString(R.string.str_list4) };
			mla = new ArrayAdapter<String>(EX04_20.this, R.layout.main, mString);
			EX04_20.this.setListAdapter(mla);
			break;
		case (MENU_LIST2):
			mString = new String[] {
					getResources().getString(R.string.str_list5),
					getResources().getString(R.string.str_list6),
					getResources().getString(R.string.str_list7),
					getResources().getString(R.string.str_list8) };
			mla = new ArrayAdapter<String>(EX04_20.this, R.layout.main, mString);
			EX04_20.this.setListAdapter(mla);
			break;
		}
		return super.onOptionsItemSelected(item);
	}
}