如何解決不抽象，不覆蓋抽象方法onTabReselected

Question

我試圖在我的應用程序中創建navigation drawer。在我的navigation drawer item,View之一中，我希望它有tabs,swipe view功能。我收到錯誤Viewview is not abstract and does not override abstract method onTabReselected。

MainActivity //用於導航抽屜項

import android.support.v4.app.Fragment; 
import android.support.v4.app.FragmentManager; 

private void selectItem(int position) { 

     Fragment fragment = null; 

     switch (position) { 
      case 0: 
       fragment=new Information(); 
       break; 
      case 1: 

       fragment=new Claims1(); 
       Bundle bundle=new Bundle(); 
       bundle.putLong("ab",WorkDetailsTable.ab); 
       fragment.setArguments(bundle); 
       break; 

      case 2: 
       fragment=new ViewView(); 
       break; 

      default: 
       break; 
     } 

     if (fragment != null) { 
      FragmentManager fragmentManager = getFragmentManager(); 
      fragmentManager.beginTransaction().replace(R.id.content_frame, fragment).commit(); 

      mDrawerList.setItemChecked(position, true); 
      mDrawerList.setSelection(position); 
      setTitle(mNavigationDrawerItemTitles[position]); 
      mDrawerLayout.closeDrawer(mDrawerList); 

     } else { 
      Log.e("MainActivity", "Error in creating fragment"); 
     } 
    } 
} 

ViewView

import android.support.v4.app.Fragment; 
import android.os.Bundle; 
import android.support.v4.app.FragmentTransaction; 
import android.support.v4.view.ViewPager; 
import android.support.v7.app.ActionBar; 
import android.view.LayoutInflater; 
import android.view.ViewGroup; 
import android.widget.AdapterView; 

public class ViewView extends Fragment implements ActionBar.TabListener { 

    private ViewPager viewPager; 
    private TabsFragmentPagerAdapter mAdapter; 
    private ActionBar actionBar; 
    private String[] tabs = {"Information", "receipt"}; 


    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     View View1 = inflater.inflate(R.layout.viewview1, container, false); 
     viewPager = (ViewPager) View1.findViewById(R.id.pager); 
     mAdapter = new TabsFragmentPagerAdapter(getActivity().getSupportFragmentManager()); 
     viewPager.setAdapter(mAdapter); 
     actionBar = getActivity().getActionBar(); 
     actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS); 
     for (int i = 0; i < 2; i++) { 
      actionBar.addTab(actionBar.newTab().setText(tabs[i]).setTabListener(this)); 
     } 
     viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() { 

      @Override 
      public void onPageSelected(int arg) { 
       // TODO Auto-generated method stub 
       actionBar.setSelectedNavigationItem(arg); 
      } 

      @Override 
      public void onPageScrolled(int arg0, float arg1, int arg2) { 
       // TODO Auto-generated method stub 

      } 

      @Override 
      public void onPageScrollStateChanged(int arg0) { 
       // TODO Auto-generated method stub 

      } 


     }); 


     BuildList(); 
     return View1; 
    } 

    public boolean onCreateOptionsMenu(Menu menu) { 
     // Inflate the menu; this adds items to the action bar if it is present. 
     getActivity().getMenuInflater().inflate(R.menu.menu_main, menu); 
     return true; 
    } 

    public void onTabReselected(ActionBar.Tab arg0, FragmentTransaction arg1) { 
     // TODO Auto-generated method stub 

    } 


    public void onTabSelected(ActionBar.Tab tab, FragmentTransaction arg1) { 
     // TODO Auto-generated method stub 
     viewPager.setCurrentItem(tab.getPosition()); 
    } 


    public void onTabUnselected(ActionBar.Tab arg0, FragmentTransaction arg1) { 
     // TODO Auto-generated method stub 
    } 
} 

TabsFragmentPagerAdapter

import android.support.v4.app.Fragment; 
import android.support.v4.app.FragmentManager; 
import android.support.v4.app.FragmentPagerAdapter; 

public class TabsFragmentPagerAdapter extends FragmentPagerAdapter { 

    public TabsFragmentPagerAdapter(FragmentManager fm) { 
     super(fm); 
     // TODO Auto-generated constructor stub 
    } 

    @Override 
    public Fragment getItem(int index) { 
     // TODO Auto-generated method stub 

     switch(index) { 
      case 0: 
       return new UpdatePage2(); 
      case 1: 
       return new Receipt(); 

     } 
     return null; 
    } 

    @Override 
    public int getCount() { 
     // TODO Auto-generated method stub 
     return 2; 
    } 

} 

錯誤

Error:(50, 47) error: incompatible types: android.app.ActionBar cannot be converted to android.support.v7.app.ActionBar

Answer 1

好了，該錯誤信息是明確的。您的ViewView類實現TabListener，但不包含onTabReselected的實施。您在執行ViewPager.OnPageChangeListener()的匿名類實例中執行onTabReselected，您可以在onCreateView方法中定義該實例。

問題是你需要ViewView來實現TabListener。如果是這樣，請將TabListener所需的方法直接添加到ViewView。如果不是，請刪除implements ActionBar.TabListener子句。