带有寻呼机的视图寻呼机适配器不起作用

Question

我正在尝试使用PagerAdapter显示来自可绘制视图寻呼机的图像。为此，我编写了以下代码--

//调用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();
    }

下面是我的适配器类--

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);
    }
}

下面是我的对话框 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 Item 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>

//下面是解释当前如何显示空的ViewPager的屏幕截图--

当我调试应用程序时，一切似乎都很好，但不知道为什么图像没有显示在ViewPager中。请帮忙..

Answer 1

((ViewPager)容器)。addView(布局)；将上述语句添加到instantiateItem()方法中的return语句之前。这肯定会对你有帮助。

Answer 2

首先，您应该使用视图组作为第一个参数来覆盖instantiateItem（），而不是使用View。后者已被弃用。

然后，需要将膨胀的视图添加到页面编辑器的instantiateItem（）方法中的。引用instantiateItem（）方法的文档：

适配器负责将视图添加到此处给出的容器

只需添加< code > container . add view(layout)；到< code>instantiateItem()方法，在< code>return语句之前。