ViewPager與PagerAdapter不工作

Question

我試圖使用PagerAdapter該視圖尋呼機從可繪製顯示圖片，我已經寫了下面的代碼 -

//調用到PagerAdapter

public void showAwardsBadgesAlert() 
    { 
     // custom dialog 
     final Dialog dialog = new Dialog(context, R.style.MyAlertDlgTheme); 
     dialog.requestWindowFeature(Window.FEATURE_NO_TITLE); 
     dialog.setContentView(R.layout.awards_badges_dlg_layout); 
     dialog.setCanceledOnTouchOutside(false); 
     dialog.setCanceledOnTouchOutside(true); 

     ViewPager awardsBadgesPager = (ViewPager) dialog.findViewById(R.id.awardsBadgesPager); 

     AwardsBadgesAdapter awardsBadgesAdapter = new AwardsBadgesAdapter(context, feedObject.getAwardStatistics().getAwardsBdgesList()); 
     awardsBadgesPager.setAdapter(awardsBadgesAdapter); 

     dialog.show(); 
    } 

//下面是我的適配器分類 -

public class AwardsBadgesAdapter extends PagerAdapter 
{ 
    private Context context; 
    private ArrayList<AwardsBadges> awardsList; 

    public AwardsBadgesAdapter(Context context, ArrayList<AwardsBadges> awardsList) 
    { 
     this.context = context; 
     this.awardsList = awardsList; 
    } 

    @Override 
    public int getCount() 
    { 
     if(awardsList != null) 
     { 
      return awardsList.size(); 
     } 
     return 0; 
    } 

    @Override 
    public boolean isViewFromObject(View view, Object object) 
    { 
     return view == object; 
    } 

    @Override 
    public Object instantiateItem(final View container, final int position) 
    { 
     LayoutInflater inflater = (LayoutInflater) this.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
     View layout = inflater.inflate(R.layout.awards_badges_dlg_item, null); 

     ImageView ivAwards = (ImageView) layout.findViewById(R.id.ivAwardsBadges); 

     AwardsBadges currBadge = awardsList.get(position); 

     if(currBadge.getImageName()!=null && currBadge.getImageName().equalsIgnoreCase("pink star diamond")) 
     { 
      Picasso.with(context).load(R.drawable.pinkstar).into(ivAwards); 
     } 
     else if(currBadge.getImageName()!=null && currBadge.getImageName().equalsIgnoreCase("tanzanite")) 
     { 
      Picasso.with(context).load(R.drawable.tanzanite).into(ivAwards); 
     } 
     else if(currBadge.getImageName()!=null && currBadge.getImageName().equalsIgnoreCase("painite")) 
     { 
      Picasso.with(context).load(R.drawable.painite).into(ivAwards); 
     } 
     else if(currBadge.getImageName()!=null && currBadge.getImageName().equalsIgnoreCase("taaffeite")) 
     { 
      Picasso.with(context).load(R.drawable.taaffeite).into(ivAwards); 
     } 


     return layout; 
    } 

    @Override 
    public void destroyItem(ViewGroup container, int position, Object object) 
    { 
     ((ViewPager) container).removeView((View) object); 
    } 

    @Override 
    public float getPageWidth(int position) 
    { 
     return (0.33f); 
    } 
} 

//下面是我的對話框xml--

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout 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/awardsBadgesPager" 
     android:layout_width="match_parent" 
     android:layout_height="@dimen/sz_seventy" 
     android:layout_below="@+id/txtPlace" 
     android:layout_margin="10dp" 
     android:background="@color/tipstransperent" 
     android:padding="10dp" 
     android:visibility="visible" > 
    </android.support.v4.view.ViewPager> 
</RelativeLayout> 

//下面是ViewPager項目xml--

<?xml version="1.0" encoding="utf-8"?> 
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:padding="5dp" > 

    <ImageView 
     android:id="@+id/ivAwardsBadges" 
     android:layout_width="@dimen/sz_fifty" 
     android:layout_height="@dimen/sz_fifty" 
     android:layout_centerInParent="true" /> 

</RelativeLayout> 

//下面是屏幕截圖當前如何解釋顯示爲空ViewPager--

當我調試應用程序時，一切似乎都很好，但不知道爲什麼圖像沒有顯示在ViewPager中。請幫助..

Answer 1

（（ViewPager）container）.addView（layout）; 在您的instantiateItem（）方法，return語句之前添加上述語句。這一定會幫助你。

Answer 2

首先，您應該覆蓋instantiateItem()方法，其中ViewGroup作爲第一個參數，而不是View作爲第一個參數。後者已棄用。

然後，您需要在PagerAdapter的instantiateItem()方法中將您的充氣View添加到container。引用的文檔的instantiateItem() method：

適配器是負責添加視圖在這裏

給出的容器只需添加container.addView(layout);到instantiateItem()法，return語句之前。