片段查看網頁和動畫

Question

我正在研究可以翻轉元素的ViewPager，就像在android動畫demo的CardFlipActivity中一樣。 我遇到了beginTransaction（）方法的問題。

唯一的快速修復方案，我得到問我從android.support.v4.app.Fragment改變FRAG的類型android.app.Fragment 當我這樣做，另一個錯誤出現，我必須改變類型回support.v4.app.Fragment.

我如何繼續？ 我在我的代碼片段和viewPagers中使用所有support.v4庫導入。

代碼：

package com.example.flag_o; 

import android.os.Bundle; 
import android.os.Handler; 
import android.support.v4.app.Fragment; 
import android.support.v4.app.FragmentActivity; 
import android.support.v4.app.FragmentManager; 
import android.support.v4.app.FragmentStatePagerAdapter; 
import android.support.v4.view.ViewPager; 
import android.view.LayoutInflater; 
import android.view.Menu; 
import android.view.MenuItem; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.ImageView; 

public class QuizGame extends FragmentActivity 
      implements FragmentManager.OnBackStackChangedListener {  


    static DataClass dc; 
    static int numQues; 
    static int quizLev; 

    static int FLIP_FOR_MAP = 1; 
    static int FLIP_FOR_INFO = 2; 

    static int frag_status=0; 
    static int questions[] = null; 

    MenuItem map; 
    MenuItem ques; 

    private Handler mHandler = new Handler(); 
    private boolean mShowingBack = false;  

    QuizPagerAdapter quizAdapter; 
    ViewPager quizPager; 

    static String RETRIEVE_POS = "position"; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     // TODO Auto-generated method stub 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.quiz_pager);     

     dc = new DataClass(); 
     numQues = getIntent().getExtras().getInt("numQ"); 
     quizLev = getIntent().getExtras().getInt("level"); 

     java.util.List<Integer> randNums = new java.util.ArrayList<Integer>(dc.flags.length); 
     for (int i = 0; i <= dc.flags.length; i++) 
     { 
      randNums.add(new Integer(i)); 
     } 
     java.util.Collections.shuffle(randNums); 

     for(int i=0;i<numQues;i++) 
      questions[i] = randNums.get(i); 

     quizAdapter = new QuizPagerAdapter(getSupportFragmentManager(),questions); 
     quizPager = (ViewPager) findViewById(R.id.quizPager); 
     quizPager.setAdapter(quizAdapter); 

     if (savedInstanceState == null) { 
      // If there is no saved instance state, add a fragment representing the 
      // front of the card to this activity. If there is saved instance state, 
      // this fragment will have already been added to the activity. 
      getFragmentManager() 
        .beginTransaction() 
        .add(R.id.container, new FlagFragment()) 
        .commit(); 
     } else { 
      mShowingBack = (getFragmentManager().getBackStackEntryCount() > 0); 
     } 
    } 

    @Override 
    public boolean onCreateOptionsMenu(Menu menu) { 
     super.onCreateOptionsMenu(menu); 

     // Add either a "photo" or "finish" button to the action bar, depending on which page 
     // is currently selected. 
     map = menu.add(Menu.NONE, R.id.action_map, Menu.NONE, 
       mShowingBack 
         ? R.string.action_photo 
         : R.string.action_map); 
     map.setIcon(mShowingBack 
       ? R.drawable.ic_action_photo 
       : android.R.drawable.ic_menu_mapmode); 
     map.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM); 

     ques = menu.add(Menu.NONE, R.id.action_ques, Menu.NONE, 
       mShowingBack 
         ? R.string.action_photo 
         : R.string.action_ques); 
     ques.setIcon(mShowingBack 
       ? R.drawable.ic_action_photo 
       : android.R.drawable.ic_menu_help); 
     ques.setShowAsAction(MenuItem.SHOW_AS_ACTION_IF_ROOM); 

     return true; 
    } 

    @Override 
    public boolean onOptionsItemSelected(MenuItem item) { 
     switch (item.getItemId()) { 
      case android.R.id.home: 
       // Navigate "up" the demo structure to the launchpad activity. 
       // See http://developer.android.com/design/patterns/navigation.html for more. 
       //NavUtils.navigateUpTo(this, new Intent(this, MainActivity.class)); 
       frag_status=0; 
       return true; 

      case R.id.action_map: 
       if(mShowingBack) 
        frag_status=0; 
       else 
        frag_status=1; 
       flipCard(FLIP_FOR_MAP);    
       return true; 

      case R.id.action_info: 
       if(mShowingBack) 
        frag_status=0; 
       else 
        frag_status=2; 
       flipCard(FLIP_FOR_INFO); 
       return true;     
     } 

     return super.onOptionsItemSelected(item); 
    }  

    @Override 
    public boolean onPrepareOptionsMenu(Menu menu) { 
     // TODO Auto-generated method stub 
     switch(frag_status) 
     { 
     case 1: 
      map.setVisible(true); 
      ques.setVisible(false); 
      break; 
     case 2: 
      map.setVisible(false); 
      ques.setVisible(true); 
      break; 
     } 
     return super.onPrepareOptionsMenu(menu); 
    }  

    @Override 
    public void onBackPressed() { 
     // TODO Auto-generated method stub 
     super.onBackPressed(); 
     map.setVisible(true); 
     ques.setVisible(true); 
    } 

    private void flipCard(int flipType) { 
     if (mShowingBack) { 
      getFragmentManager().popBackStack(); 
      return; 
     } 

     mShowingBack = true;   
     Fragment mapFrag; 
     InfoFragment infoFrag; 
     Bundle args = new Bundle(); 

     args.putInt(RETRIEVE_POS, questions[quizPager.getCurrentItem()]);  

     switch(flipType) { 
      case 1 : 
       mapFrag = new Fragment(); 
       mapFrag.setArguments(args); 
       getFragmentManager()       
       .beginTransaction()    
       .setCustomAnimations(
         R.animator.card_flip_right_in, R.animator.card_flip_right_out, 
         R.animator.card_flip_left_in, R.animator.card_flip_left_out) 
       .replace(R.id.container, mapFrag)    
       .addToBackStack(null) 
       .commit(); 
       break; 
      case 2 : 
       frag = new InfoFragment(); 
       frag.setArguments(args); 
       getFragmentManager() 
       .beginTransaction()    
       .setCustomAnimations(
        R.animator.card_flip_right_in, R.animator.card_flip_right_out, 
        R.animator.card_flip_left_in, R.animator.card_flip_left_out) 
       .replace(R.id.container, frag)    
       .addToBackStack(null) 
       .commit(); 
      break;   
     } 

     mHandler.post(new Runnable() { 
      @Override 
      public void run() { 
       invalidateOptionsMenu(); 
      } 
     }); 
    } 

    @Override 
    public void onBackStackChanged() { 
     mShowingBack = (getFragmentManager().getBackStackEntryCount() > 0); 

     // When the back stack changes, invalidate the options menu (action bar). 
     invalidateOptionsMenu(); 
    } 

    public static class FlagFragment extends Fragment { 
     int position; 
     Bundle args; 

     public FlagFragment() { 
      position = args.getInt(RETRIEVE_POS); 
     }   

     @Override 
     public View onCreateView(LayoutInflater inflater, ViewGroup container, 
       Bundle savedInstanceState) { 
      View rootView = inflater.inflate(R.layout.pic_fragment, container, false); 

      ImageView flipImg = (ImageView)rootView.findViewById(R.id.flipFlagImage);    
      try { 
       flipImg.setImageResource(dc.flags[position]); 
      } catch (IllegalArgumentException e) { 
       // TODO Auto-generated catch block 
       e.printStackTrace(); 
      } 

      return rootView; 
     } 
    } 

    public static class MapFragment extends Fragment { 

     int position; 
     Bundle args; 

     public MapFragment() { 
      position = args.getInt(RETRIEVE_POS); 
     } 

     @Override 
     public View onCreateView(LayoutInflater inflater, ViewGroup container, 
       Bundle savedInstanceState) { 
      View rootView = inflater.inflate(R.layout.map_fragment, container, false); 

      ImageView flipImg = (ImageView)rootView.findViewById(R.id.flipMapImage);    
      try { 
       flipImg.setImageResource(dc.ortho[position]); 
      } catch (IllegalArgumentException e) { 
       // TODO Auto-generated catch block 
       e.printStackTrace(); 
      } 

      return rootView; 
     } 
    } 

    public static class InfoFragment extends Fragment { 

     public InfoFragment() { 
     } 

     @Override 
     public View onCreateView(LayoutInflater inflater, ViewGroup container, 
       Bundle savedInstanceState) { 
      return inflater.inflate(R.layout.info_fragment, container, false); 
     } 
    } 

    public class QuizPagerAdapter extends FragmentStatePagerAdapter {  

     int fragDet[]; 
     Fragment frag; 
     Bundle args; 

      public QuizPagerAdapter(FragmentManager fragmentManager, int [] q) { 
       super(fragmentManager); 
       fragDet = q; 
      } 

      @Override 
      public Fragment getItem(int i) {     

       frag = new FlagFragment(); 
       args.putInt(RETRIEVE_POS, fragDet[i]); 
       frag.setArguments(args); 
       return frag; 
      } 

      @Override 
      public int getCount() { 
       return numQues; 
      } 

      @Override 
      public CharSequence getPageTitle(int position) { 
       String title = null; 
       switch(position) 
       { 
        case 0 : title = "Paired Devices"; 
          break; 
        case 1 : title = "Chats"; 
          break; 
        case 2 : title = "New Devices"; 
          break; 
       } 
       return (CharSequence)title; 
      } 
    } 
} 

Answer 1

支持庫的片段類不支持動畫的交易。

其關閉動畫或構建應用程序的設備與API高於11 http://developer.android.com/reference/android/app/FragmentTransaction.html

這個另一種方式之間的貿易是用從傑克沃頓NineOldAndroids庫和代碼自己的事務。