安卓学习解疑1

经过一周的学习，想来是对安卓开发认识颇深，但是，在学习中也遇到很多不解，下面就让我来记录下这些让人难以理解的部分吧
1.
2.inflate(R.men.main,menu);
3.setResult(RESULT_OK,intent);
4.gravity和layout_gravity区别
5.layoutInflater.from(content).infalte(R.layout.title,this);
6.ArrayAdapter adapter = new ArrayAdapter(MainActivity.this, android.R.layout.simple_list_item,data);
7.adapter.notifyItemInserted(msgList.size()-1);
9.FragmentManager fragmentManager = getSupportFragmentManager();
10.FragmentTransaction transcation = fragmentManager.beginTransaction();
12.transaction.replace(R.id.right_layout,fragment);
13.transaction.commit();
14.transaction.addToBackStack(null);
Android FragmentManage FragmentTransaction介绍