Android从零开始（十八）

知识点：菜单（menu）

步骤一、创建菜单项（核心代码如下）

@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		
		//参数1:分组id
				//参数2:菜单项id
				//参数3:顺序
				//参数4:菜单文字
				MenuItem item1=menu.add(0, 0, 0, "菜单1");
				item1.setIcon(R.drawable.ic_launcher);
				item1.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
				MenuItem item2=menu.add(0, 1, 1, "菜单2");
				item2.setIcon(R.drawable.ic_launcher);
				item2.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
				MenuItem item3=menu.add(0, 2, 2, "菜单3");
				item3.setIcon(R.drawable.ic_launcher);
				item3.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
				MenuItem item4=menu.add(0, 3, 3, "菜单4");
				item4.setIcon(R.drawable.ic_launcher);
				item4.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM);
				MenuItem item5=menu.add(0, 4, 4, "菜单5");
				item5.setIcon(R.drawable.ic_launcher);
				MenuItem item6=menu.add(0, 5, 5, "菜单6");
				item6.setIcon(R.drawable.ic_launcher);
				MenuItem item7=menu.add(0, 6, 6, "菜单5");
				item7.setIcon(R.drawable.ic_launcher);
				MenuItem item8=menu.add(0, 7, 7, "菜单6");
				item8.setIcon(R.drawable.ic_launcher);
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

步骤二、菜单项被选中事件）（核心代码如下）

@Override
	public boolean onOptionsItemSelected(MenuItem item) {
		// TODO Auto-generated method stub
		switch(item.getItemId()){
		case 0:
			Toast.makeText(this, "菜单1", Toast.LENGTH_SHORT).show();
			break;
		case 1:
			Toast.makeText(this, "菜单2", Toast.LENGTH_SHORT).show();
			break;
		case 2:
			Toast.makeText(this, "菜单3", Toast.LENGTH_SHORT).show();
			break;
		case 3:
			Toast.makeText(this, "菜单4", Toast.LENGTH_SHORT).show();
			break;
		case 4:
			Toast.makeText(this, "菜单5", Toast.LENGTH_SHORT).show();
			break;
		case 5:
			Toast.makeText(this, "菜单6", Toast.LENGTH_SHORT).show();
			break;
		case android.R.id.home:
			Toast.makeText(this, "Home", Toast.LENGTH_SHORT).show();
			break;
		}
		return super.onOptionsItemSelected(item);
	}

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