ViewPager與ContextMenu這是不同的每個視圖

Question

我有一個ViewPagerActivity與兩個視圖。我想註冊一個上下文菜單，對於每個視圖都是不同的。我嘗試了一些東西（registerForContextMenu()），但是我總是以兩個視圖結束，就像第二個視圖一樣。有任何想法嗎？

public class ViewPagerActivity extends UomeActivity { 

    private ViewPager viewPager;   
    private ViewPagerAdapter viewPagerAdapter; 
    private ListAdapter adapter; 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.view_pager); 

     refreshAdapter(); 
    } 

    private class ViewPagerAdapter extends PagerAdapter { 

     private final List<Transaction> accountTransactions; 
     private final List<User> accountUsers; 

     public ViewPagerAdapter() { 
      // initialize lists 
     } 

     @Override 
     public Object instantiateItem(View collection, int viewPosition) { 
      View layout; 
      ListView listView; 
      switch (viewPosition) { 
       case 0: 
        layout = LayoutInflater.from(getApplicationContext()).inflate(
          R.layout.list_account_paired_transactions, null); 

        List<PairedTransaction> pairedTransactions = getPairedTransactions(); 

        adapter = new AccountPairedTransactionItemAdapter(ViewPagerActivity.this, 
          R.layout.list_account_paired_transactions, pairedTransactions); 

        listView = (ListView) layout.findViewById(android.R.id.list); 
        listView.setOnItemClickListener(new OnItemClickListener() { 
         @Override 
         public void onItemClick(AdapterView<?> parent, View view, int position, 
           long id) { 
          // do something 
         } 
        }); 
        registerForContextMenu(listView); 
        break; 
       case 1: 
        layout = LayoutInflater.from(getApplicationContext()).inflate(
          R.layout.list_account_transactions, null); 
        initViewPagerInfo(layout, R.string.paired_transactions, 
          R.string.all_account_transactions, R.string.empty, viewPosition); 

        adapter = new TransactionItemAdapter(ViewPagerActivity.this, 
          R.layout.list_account_transactions, accountTransactions, 
          new UserDaoImpl(
            getApplicationContext())); 

        listView = (ListView) layout.findViewById(android.R.id.list); 
        registerForContextMenu(listView); 
        break; 
       default: 
        throw new IllegalArgumentException("Unsupported number of views."); 
      } 

      listView.setAdapter(adapter); 
      listView.setDivider(new ColorDrawable(R.color.list_separator)); 
      listView.setDividerHeight(1); 
      listView.setBackgroundColor(Color.WHITE); 
      listView.setCacheColorHint(Color.WHITE); 
      ((ViewPager) collection).addView(layout); 

      return layout; 
     } 

     // omitted 

    } 

    @Override 
    protected void onResume() { 
     refreshAdapter(); 
     super.onResume(); 
    } 

    private void refreshAdapter() { 
     viewPagerAdapter = new ViewPagerAdapter(); 
     viewPager = findById(R.id.view_pager); 
     viewPager.setAdapter(viewPagerAdapter); 
    } 

    @Override 
    public void onCreateContextMenu(ContextMenu menu, View view, ContextMenuInfo menuInfo) { 
     menu.add(R.string.show_info); 
    } 

    @Override 
    public boolean onContextItemSelected(MenuItem item) { 
     // TODO: toast which object has been selected 
    } 

} 

Answer 1

問題是兩個視圖都在同一時間實例化（填充viewpager）。在第二個視圖中設置onRegisterForContextMenu將覆蓋第一個視圖。

一個可能的解決方案是檢查看看你在哪個視圖中可見onContextItemSelected方法。