代码添加菜单
import android.app.Activity;import android.os.Bundle;import android.view.Gravity;import android.view.Menu;import android.view.MenuItem;import android.widget.Toast;/** * Class which shows how to handle menu item selection * * @author FaYnaSoft Labs */public class Main extends Activity {private static final int OK_MENU_ITEM = Menu.FIRST;private static final int SAVE_MENU_ITEM = OK_MENU_ITEM + 1;private static final int BACK_MENU_ITEM = SAVE_MENU_ITEM + 1;@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.main);}@Overridepublic boolean onCreateOptionsMenu(Menu menu){menu.add(0, OK_MENU_ITEM, 0, "Ok");menu.add(0, SAVE_MENU_ITEM, 0, "Save");menu.add(0, BACK_MENU_ITEM, 0, "Back");return super.onCreateOptionsMenu(menu);}@Overridepublic boolean onOptionsItemSelected(MenuItem item){switch (item.getItemId()) {case OK_MENU_ITEM:showMsg("Ok");break;case SAVE_MENU_ITEM:showMsg("Save");break;case BACK_MENU_ITEM:showMsg("Back");break;}return super.onOptionsItemSelected(item);}private void showMsg(String msg) {Toast toast = Toast.makeText(Main.this, msg, Toast.LENGTH_LONG);toast.setGravity(Gravity.CENTER, toast.getXOffset() / 2, toast.getYOffset() / 2);toast.show();}}?