第一行代码之菜单

public boolean onCreateOptionsMenu(Menu menu){
    getMenuInflater().inflate(R.menu.menu,menu);
    //getMenuInflater返回一个MenuInflater对象
    //r.menu.menu为菜单资源文件，menu为装载资源文件的对象

    return true;
    //返回true，让菜单显示出来
}

//响应事件
public boolean onOptionsItemSelected(MenuItem item){
    switch(item.getItemId()){
        case R.id.add_item:
                Toast.makeText(MainActivity.this, "You clicked Add ", Toast.LENGTH_SHORT).show();
                break;

            case R.id.remote_item:
                Toast.makeText(MainActivity.this,"You clicked Remote",Toast.LENGTH_SHORT).show();
                break;
            default:
    }
    return true;
}