FrameLayout和Fragment处理Android应用UI布局实例

将Fragment与Layout结合使用,一般都是主Activity以frame填充Activity的方式交互管理Fragment :

1.由于用到getSupportFragmentManager()之类,所以主Activity的extends需为FragmentActivity:

  public class MainActivity extends FragmentActivity{
    ..........
  }

2.主Activity的layout(xml文件)中建立多个Frame并定义其Android:id="@+id/XXX"
3.主Activity内操作函数中,由查找id来对这些FrameLayout进行Activity填充:
   添加语句如下

复制代码 代码如下:

   getSupportFragmentManager().beginTransaction().add(R.id.fragment_container2,new NullFrag()).commit();


   取得支持Fragment管理()->开始交易()->添加(frame的id , Fragment).交付(); 
   替换语句如下
   getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container2,new NullFrag()).commit();
   取得支持Fragment管理()->开始交易()->替代(frame的id , Fragment).交付();
例:

复制代码 代码如下:

    public void click_btn_flag02(View view){
         getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container2,new MidFrag()).commit();
    }


注:函数参数要用View

下面我们来看实例:

FrameLayout和Fragment处理Android应用UI布局实例_第1张图片
效果图的左边是一个列表,右边是列表item的详情。
先看一下布局文件(layout):

 
 
  
  
 

        布局文件中使用了fragment标签和FrameLayout标签。Android Fragment使用 中介绍了2中嵌入Fragment的方法,这个实例中都用到,从布局文件看到有了fragment标签,这是一种使用方法,FrameLayout标签将会成为第二种加载fragment的载体view。
        看一下程序实现(com.fragment.main.TitlesFragment):

public class TitlesFragment extends ListFragment { 
 
 int mCurCheckPosition = 0; 
 int mShownCheckPosition = -1; 
 
 @Override 
 public void onActivityCreated(Bundle savedInstanceState) { 
  super.onActivityCreated(savedInstanceState); 
               
  setListAdapter(new ArrayAdapter(getActivity(), 
    android.R.layout.simple_list_item_activated_1, 
    Shakespeare.TITLES)); //使用静态数组填充列表 
  if (savedInstanceState != null) { 
   mCurCheckPosition = savedInstanceState.getInt("curChoice", 0); 
   mShownCheckPosition = savedInstanceState.getInt("shownChoice", -1); 
  } 
   getListView().setChoiceMode(ListView.CHOICE_MODE_SINGLE); 
   showDetails(mCurCheckPosition); 
 } 
 
 @Override 
 public void onSaveInstanceState(Bundle outState) { 
  super.onSaveInstanceState(outState); 
 
  outState.putInt("curChoice", mCurCheckPosition); 
  outState.putInt("shownChoice", mShownCheckPosition); 
 } 
 
 @Override 
 public void onListItemClick(ListView l, View v, int position, long id) { 
  showDetails(position); 
 } 
 
 /** 
  *显示listview item 详情 
  */ 
 void showDetails(int index) { 
  mCurCheckPosition = index; 
   getListView().setItemChecked(index, true); 
 
   if (mShownCheckPosition != mCurCheckPosition) { 
 
    DetailsFragment df = DetailsFragment.newInstance(index); 
    FragmentTransaction ft = getFragmentManager() 
      .beginTransaction(); 
    ft.replace(R.id.details, df); 
    ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE); 
    ft.commit(); 
    mShownCheckPosition = index; 
   }  
 } 
 
} 

TitlesFragment
TitlesFragment继承自Fragment的子类ListFragment,使用了一个静态数组填充列表,重写了onListItemClick方法,showDetails方法展示ListView item的详情。

DetailsFragment df = DetailsFragment.newInstance(index);//获取详情Fragment的实例
FragmentTransaction ft = getFragmentManager().beginTransaction();//获取FragmentTransaction 实例
ft.replace(R.id.details, df); //使用DetailsFragment 的实例
ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE);
ft.commit();//提交

看一下DetailsFragment :

public class DetailsFragment extends Fragment { 
 
 /**  * Create a new instance of DetailsFragment, initialized to  * show the text at 'index'.  */ 
 public static DetailsFragment newInstance(int index) { 
  DetailsFragment f = new DetailsFragment(); 
  // Supply index input as an argument.   
  Bundle args = new Bundle(); 
  args.putInt("index", index); 
  f.setArguments(args); 
  return f; 
 } 
 
 @Override 
 public View onCreateView(LayoutInflater inflater, ViewGroup container, 
   Bundle savedInstanceState) { 
  if (container == null) {    
   return null; 
  } 
  ScrollView scroller = new ScrollView(getActivity()); 
  TextView text = new TextView(getActivity()); 
 
  int padding = (int) TypedValue.applyDimension( 
    TypedValue.COMPLEX_UNIT_DIP, 4, getActivity().getResources() 
      .getDisplayMetrics()); 
  text.setPadding(padding, padding, padding, padding); 
  scroller.addView(text); 
  text.setText(Shakespeare.DIALOGUE[getArguments().getInt("index", 0)]); 
  return scroller; 
 } 
} 

 
DetailsFragment 中使用newInstance(int index)方法产生DetailsFragment 实例并接受整型参数,重载了onCreateView方法创建view。

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