Question

使用SwipableTabsLayout和SwipeRefreshLayout时遇到一些问题。每当我启动应用程序时，测试拉动刷新，应用程序崩溃：

01-31 23:00:49.376    2181-2181/com.larswise.ru2 E/AndroidRuntime﹕ FATAL EXCEPTION: main
    Process: com.larswise.ru2, PID: 2181
    java.lang.NullPointerException
            at android.support.v4.widget.SwipeRefreshLayout.startRefresh(SwipeRefreshLayout.java:530)
            at android.support.v4.widget.SwipeRefreshLayout.onTouchEvent(SwipeRefreshLayout.java:484)
            at android.view.View.dispatchTouchEvent(View.java:8112)

我有一个包含3个标签的SwipableTabLayout;对于每个标签我都有一个片段视图分页器适配器为所选选项卡的视图膨胀，如下所示：

@Override
public Object instantiateItem(ViewGroup container, int position) {
    int posFragment;
    switch(position) {
        case 0: posFragment = R.layout.root_feed_layout; break;
        case 1: posFragment = R.layout.discover_view; break;
        case 2: posFragment = R.layout.settings_view; break;
        default: posFragment = R.layout.feed_layout;
    }

    View view = getActivity().getLayoutInflater().inflate(posFragment,
            container, false);
    container.addView(view);
    return view;
}

在其中一个布局中，＆＃34; root_feed_layout＆＃34;，我有一个片段引用：

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:name="com.larswise.ru2.fragments.FeedFragment"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="match_parent"
    android:id="@+id/feed_root_layout">

    <fragment
        android:layout_width="fill_parent"
        android:layout_height="match_parent"
        android:name="com.larswise.ru2.fragments.FeedFragment"/>

</RelativeLayout>

这是片段的布局，＆＃34; FeedFragment＆＃34;我有SwipeRefreshLayout：

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/feed_root"
    android:layout_width="fill_parent"
    android:orientation="vertical"
    android:layout_height="fill_parent">
    <android.support.v4.widget.SwipeRefreshLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_paren"
        android:id="@+id/swipe_refresh_layout">
        <ScrollView
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:background="#ffffff">

            <ListView
                android:id="@+id/post_list"
                android:layout_width="fill_parent"
                android:layout_height="0dip"
                android:layout_weight="2"
                android:cacheColorHint="#000000"
                android:divider="#D5DDDE"
                android:dividerHeight="1dp"
                android:drawSelectorOnTop="false"
                android:focusableInTouchMode="false"
                android:footerDividersEnabled="false"
                android:headerDividersEnabled="true"
                android:listSelector="@android:color/transparent" />

            </ScrollView>
        </android.support.v4.widget.SwipeRefreshLayout>
<LinearLayout
    android:id="@+id/footer"
    android:layout_width="fill_parent"
    android:layout_height="0dp"
    android:orientation="horizontal"
    android:layout_weight="1"
    android:gravity="center|bottom">

        <Button
            android:id="@+id/newButton"
            style="@style/BottomBarButton"
            android:text="@string/menu_new" />
        <View
            android:layout_width="1dip"
            android:layout_height="35dp"
            />
        <Button
            android:id="@+id/extraButton"
            style="@style/BottomBarButton"
            android:text="@string/menu_test" />
</LinearLayout>
</LinearLayout>

有关如何解决此问题或为何失败的任何提示都表示赞赏。谢谢！

Answer 1

好吧，我刚刚错过了mSwipeRefresh.setOnRefreshListener（this）; 这是我的片段，实现了SwipeRefreshLayout.OnRefreshListener。

Slidingtablayout内的SwipableRefreshLayout崩溃应用程序

1 个答案: