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【Andorid X 项目笔记】嵌套Fragment的使用（5）

日期：2017-12-03点击：438收藏

一、准备

关于最新的Android兼容包的介绍，参见官网这里。可以在android sdk目录下extras/android/support/v13/android-support-v13.jar找到最新版，注意是伴随着Android 4.2一起更新的。

关于嵌套Fragment的介绍，参照官网这里。

二、截图

三、代码

FragmentNestActivity.java

 import android.graphics.Color; 
 import android.os.Bundle; 
 import android.support.v4.app.Fragment; 
 import android.support.v4.app.FragmentActivity; 
 import android.support.v4.app.FragmentStatePagerAdapter; 
 import android.support.v4.app.FragmentTransaction; 
 import android.support.v4.view.ViewPager; 
 import android.view.Gravity; 
 import android.view.LayoutInflater; 
 import android.view.View; 
 import android.view.View.OnClickListener; 
 import android.view.ViewGroup; 
 import android.widget.TextView; 
 
 /** 
  * 嵌套Fragment使用
  * 
  *  @author  农民伯伯
  *  @see   http://www.cnblogs.com/over140/archive/2013/01/02/2842227.html 
  * 
   */ 
 public  class FragmentNestActivity  extends FragmentActivity  implements OnClickListener { 
 
     @Override 
      protected  void onCreate(Bundle arg0) { 
          super.onCreate(arg0); 
         setContentView(R.layout.nested_fragments); 
 
         findViewById(R.id.btnModule1).setOnClickListener( this); 
         findViewById(R.id.btnModule2).setOnClickListener( this); 
         findViewById(R.id.btnModule3).setOnClickListener( this); 
 
         findViewById(R.id.btnModule1).performClick(); 
     } 
 
     @Override 
      public  void onClick(View v) { 
          switch (v.getId()) { 
          case R.id.btnModule1: 
             addFragmentToStack(FragmentParent.newInstance(0)); 
              break; 
          case R.id.btnModule2: 
             addFragmentToStack(FragmentParent.newInstance(1)); 
              break; 
          case R.id.btnModule3: 
             addFragmentToStack(FragmentParent.newInstance(2)); 
              break; 
         } 
     } 
 
      private  void addFragmentToStack(Fragment fragment) { 
         FragmentTransaction ft = getSupportFragmentManager().beginTransaction(); 
          //         ft.setCustomAnimations(android.R.anim.slide_in_left, android.R.anim.slide_in_left); 
        ft.replace(R.id.fragment_container, fragment); 
         ft.commit(); 
     } 
 
      /**  嵌套Fragment  */ 
      public  final  static  class FragmentParent  extends Fragment { 
 
          public  static  final FragmentParent newInstance( int position) { 
             FragmentParent f =  new FragmentParent(); 
             Bundle args =  new Bundle(2); 
             args.putInt("position", position); 
             f.setArguments(args); 
              return f; 
         } 
 
         @Override 
          public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
             View convertView = inflater.inflate(R.layout.viewpager_fragments, container,  false); 
             ViewPager pager = (ViewPager) convertView.findViewById(R.id.pager); 
 
              final  int parent_position = getArguments().getInt("position"); 
              // 注意这里的代码 
            pager.setAdapter( new FragmentStatePagerAdapter(getChildFragmentManager()) { 
 
                 @Override 
                  public Fragment getItem( final  int position) { 
                      return  new Fragment() { 
                         @Override 
                          public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
                             TextView convertView =  new TextView(getActivity()); 
                             convertView.setLayoutParams( new ViewGroup.LayoutParams(ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.FILL_PARENT)); 
                             convertView.setGravity(Gravity.CENTER); 
                             convertView.setTextSize(30); 
                             convertView.setTextColor(Color.BLACK); 
                             convertView.setText("Page " + position); 
                              return convertView; 
                         } 
                     }; 
                 } 
 
                 @Override 
                  public  int getCount() { 
                      return 3; 
                 } 
 
                 @Override 
                  public CharSequence getPageTitle( int position) { 
                      return "Page " + parent_position + " - " + position; 
                 } 
 
             }); 
 
              return convertView; 
         } 
     } 
 } 

代码说明：

这里最关键的是方法getChildFragmentManager的支持。这里也演示了Fragment作为嵌套内部类的使用方法。

nested_fragments.xml

 <? xml version="1.0" encoding="utf-8" ?> 
 < LinearLayout  xmlns:android ="http://schemas.android.com/apk/res/android" 
     android:layout_width ="match_parent" 
     android:layout_height ="match_parent" 
     android:orientation ="vertical"   > 
 
      < FrameLayout
          android:id ="@+id/fragment_container" 
         android:layout_width ="fill_parent" 
         android:layout_height ="0dip" 
         android:layout_weight ="1.0" 
         android:background ="#F7F5DE"   > 
      </ FrameLayout > 
 
      < LinearLayout
          android:layout_width ="fill_parent" 
         android:layout_height ="wrap_content" 
         android:layout_gravity ="bottom" 
         android:background ="@android:color/black" 
         android:orientation ="horizontal"   > 
 
          < ImageView
              android:id ="@+id/btnModule1" 
             android:layout_width ="wrap_content" 
             android:layout_height ="wrap_content" 
             android:layout_marginBottom ="3dp" 
             android:layout_marginLeft ="7dp" 
             android:layout_marginTop ="3dp" 
             android:src ="@android:drawable/ic_dialog_dialer"   /> 
 
          < ImageView
              android:id ="@+id/btnModule2" 
             android:layout_width ="wrap_content" 
             android:layout_height ="wrap_content" 
             android:layout_marginBottom ="3dp" 
             android:layout_marginLeft ="7dp" 
             android:layout_marginTop ="3dp" 
             android:src ="@android:drawable/ic_dialog_info"   /> 
 
          < ImageView
              android:id ="@+id/btnModule3" 
             android:layout_width ="wrap_content" 
             android:layout_height ="wrap_content" 
             android:layout_marginBottom ="3dp" 
             android:layout_marginLeft ="7dp" 
             android:layout_marginTop ="3dp" 
             android:src ="@android:drawable/ic_dialog_alert"   /> 
      </ LinearLayout > 
 
 </ LinearLayout > 

viewpager_fragments.xml

 <? xml version="1.0" encoding="utf-8" ?> 
 < LinearLayout  xmlns:android ="http://schemas.android.com/apk/res/android" 
     android:layout_width ="match_parent" 
     android:layout_height ="match_parent"   > 
 
      < android.support.v4.view.ViewPager
          android:id ="@+id/pager" 
         android:layout_width ="match_parent" 
         android:layout_height ="match_parent"   > 
 
          < android.support.v4.view.PagerTitleStrip
              android:layout_width ="wrap_content" 
             android:layout_height ="wrap_content" 
             android:layout_gravity ="top"   /> 
      </ android.support.v4.view.ViewPager > 
 
 </ LinearLayout > 