Android 上 ScrollView 中的空白 ViewPagers

Question

各位，有谁能帮帮我吗？

我有一个“小部件”对象的列表，对于这些小部件中的每一个，我需要创建一个带有 ViewPager 的 CardView，附加一个适配器并将其添加到我的 Activity 视图中。问题是只有第一个小部件有效，其他都是空白的！问题不在于“小部件”对象，因为如果我更改它们在数组中的顺序，第一个小部件总是可以工作的！这是我调用将视图添加到屏幕的方法：

private void setUpWidgets(){
    int widgetsSize = widgets.size();
    layoutToAddViews.removeAllViews();
    for(int iterator = 0; iterator<widgetsSize; iterator++) {
        Widget currentWidget = widgets.get(iterator);
        if (currentWidget.getIs_enabled()) {
                    final WidgetPagerAdapter pagerAdapter = new WidgetPagerAdapter(getChildFragmentManager(), currentWidget, getContext());
                    final View v = LayoutInflater.from(getContext()).inflate(R.layout.list_item_downline_reporting_widget_tabbed, layoutToAddViews, false);
                    views.add((CardView) v);
                    final ViewPager viewPager = (ViewPager) v.findViewById(R.id.view_pager);
                    final LinearLayout indicatorsParent = (LinearLayout) v.findViewById(R.id.linearIndicatorsParent);
                    final int size = currentWidget.getTile_items().size();
                    ((TextView) v.findViewById(R.id.widgetTitle)).setText(currentWidget.getTitle());
                    layoutToAddViews.addView(v);
                    viewPager.setAdapter(pagerAdapter);
                    viewPager.setOffscreenPageLimit(3);
         }
    }
}

适配器：

public class WidgetPagerAdapter extends FragmentPagerAdapter {

ArrayList<Object> items;
ArrayList<String> slugs;
Context context;
HashMap<Integer,Fragment> fragments;
Widget widget;

public Fragment getFragments(int position) {
    return fragments.get(position);
}

public WidgetPagerAdapter(FragmentManager fm, Widget widget, Context context) {
    super(fm);
    this.widget = widget;
    this.items = widget.getTile_items();
    this.slugs = widget.getTile_item_slugs();
    this.context = context;
    this.fragments = new HashMap<>(items.size());
}

@Override
public Fragment getItem(int position) {
    /*
        Creates the specific fragment depending on which widget slug it is.
     */
    Fragment fragment;

    switch (slugs.get(position)){

        case Widget.MY_STATUS_SLUG:
            fragment = MyStatusFragment.newInstance((ProfileItem) items.get(position));
            break;

        case Widget.RANK_REPORT_GOAL_SLUG:
            fragment = RankReportFragment.newInstance((RankReportItem) items.get(position));
            break;

        case Widget.RANK_REPORT_ATTAINED_SLUG:
            fragment = RankReportFragment.newInstance((RankReportItem) items.get(position));
            break;

        case Widget.RANK_REPORT_PREVIOUS_SLUG:
            fragment = RankReportFragment.newInstance((RankReportItem) items.get(position));
            break;

        case Widget.NEW_ENROLLMENTS_SLUG:
            fragment = NewEnrollmentsFragment.newInstance((NewEnrollmentsItem) items.get(position));
            break;

        case Widget.VOLUME_HISTORY_SLUG:
            fragment = VolumeHistoryFragment.newInstance((VolumeHistoryItem) items.get(position));
            break;

        case Widget.MY_AUTOSHIP_SLUG:
            fragment = MyAutoshipFragment.newInstance((MyAutoshipItem) items.get(position));
            break;

        case Widget.ADDITIONAL_SERVICES_SLUG:
            fragment = null;
            break;

        default:
            fragment = null;
    }

    fragments.put(position, fragment);
    return fragment;
}

@Override
public int getCount() {
    return items.size();
}

}

布局：

    <?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    app:cardBackgroundColor="@color/white"
    android:layout_marginLeft="10dp"
    android:layout_marginTop="10dp"
    android:layout_marginRight="10dp"
    >

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        >

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="My Status"
        android:textColor="@color/black"
        android:layout_margin="10dp"
        android:id="@+id/widgetTitle"
        android:textSize="16sp"
        />

        <RelativeLayout
            android:layout_width="match_parent"
            android:layout_height="25dp"
            android:layout_alignParentBottom="true"
            >

        <LinearLayout
            android:layout_alignParentBottom="true"
            android:id="@+id/linearIndicatorsParent"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_gravity="center_horizontal"
            android:gravity="center_horizontal"
            android:orientation="horizontal"
            >


        </LinearLayout>

        <FrameLayout
            android:visibility="invisible"
            android:id="@+id/frameSelectedPage"
            android:elevation="3dp"
            android:layout_width="8dp"
            android:layout_height="8dp"
            android:background="@drawable/blue_circle"
            ></FrameLayout>

        </RelativeLayout>

        <android.support.v4.view.ViewPager
            android:id="@+id/view_pager"
            android:layout_width="match_parent"
            android:layout_height="490dp"></android.support.v4.view.ViewPager>

    </RelativeLayout>

</android.support.v7.widget.CardView>

Answer 1

我设法找到了解决方案！对于那些有同样问题的人，请查看另一个问题的答案：https://stackoverflow.com/a/12894074/2568851

你要做的就是给每个viewpager分配一个不同的ID，所以我所做的只是下面这行：

final ViewPager viewPager = (ViewPager) v.findViewById(R.id.view_pager);

我补充说：

viewPager.setId(iterator+1);

而且它不像魅力:)