给Activity添加菜单

            android:id="@+id/add_item"
        android:title="add" 
        />
		    android:id="@+id/removee_item"
	    android:title="remove"
	    />

//复写
	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		//给当前Activity，添加菜单
		//R.menu.main,添加哪个资源文件
		//menu，菜单项，添加到哪个Menu对象
		getMenuInflater().inflate(R.menu.main, menu);

		return true;//让创建的菜单显示，false，则不显示
	}

	//复写，菜单响应事件
	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
		switch (item.getItemId()) {
		case R.id.add_item:
			Toast.makeText(FirstActivity.this, "This is add menu", Toast.LENGTH_LONG).show();
			break;

		case R.id.removee_item:
			Toast.makeText(FirstActivity.this, "This is remove menu", Toast.LENGTH_LONG).show();
		default:
			break;
		}
		return true;
	}