Android复习笔记(13)-Fragment的使用（1）

fragment: 碎片，可以把屏幕划分成多个部分，单独显示一个界面。
fragment的使用（动态引用） 1.定义activity_main布局文件，添加一个fragment的container 2.定义fragment的布局文件，和变量activity文件一样。 3.初始化Fragment组件，使用onCreateView初始化视图。 4.MainActivity继承FragmentActivity，并添加fragment到activity中
例：、 Fragment1类 //在createView方法中创建fragment的视图 @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { //这里第二个参数传空，不然会报错 return inflater.inflate(R.layout.frament1, null); }
//MainActivity类 lvMenu = (ListView) findViewById(R.id.lv_menu); String[] array = new String[] { "选项1", "选项2", "选项3", "选项4", "选项5", "选项6", "选项7", "选项8", "选项9", "选项10" }; lvMenu.setAdapter(new ArrayAdapter<String>(this, R.layout.lv_item, R.id.tv_menu, array));
lvMenu.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { Object item = parent.getItemAtPosition(position); Toast.makeText(getApplicationContext(), item.toString(), 0).show(); //获取FragmentManager FragmentManager fm = getSupportFragmentManager(); //开启事务 FragmentTransaction transaction = fm.beginTransaction(); System.out.println(position); switch (position) { case 0: transaction.replace(R.id.ll_container, new Fragment1()); break; case 1: transaction.replace(R.id.ll_container, new Fragment2()); break; case 2: transaction.replace(R.id.ll_container, new Fragment3()); break; default: transaction.replace(R.id.ll_container, new Fragment3()); break; } transaction.commit(); } }); }

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