在ViewPager中使用SwipeRefreshLayout和WebView

Question

我在應用程序中使用SwipeRefreshLayout和WebView沒問題。

在ViewPager代碼內部：

@Override
public Object instantiateItem(View collection, int position) {

    currentArticle = newsList.get(position);

    View webViewContainer =  getActivity().getLayoutInflater().inflate(R.layout.view_pager_item, null);

    WebView webview = (WebView) webViewContainer.findViewById(R.id.webview);
    SetSettingForWebView(webview);
    webview.loadUrl(currentArticle.getArticleURL());
    SwipeRefreshLayout swipe = (SwipeRefreshLayout) webViewContainer.findViewById(R.id.swipe_container);
    setSettingForSwipeLayout(swipe);
    ((ViewPager) collection).addView(webViewContainer, 0);

    return webViewContainer;
}

無論是否定義SwipeRefreshLayout都會發生錯誤。

這是錯誤。 如您所見，它與我的代碼無關，但我不知道如何解決這一問題

日志：

05-25 21:55:59.804: E/AndroidRuntime(4665): FATAL EXCEPTION: main
05-25 21:55:59.804: E/AndroidRuntime(4665): Process: com.dimrix.test, PID: 4665
05-25 21:55:59.804: E/AndroidRuntime(4665): java.lang.NullPointerException
05-25 21:55:59.804: E/AndroidRuntime(4665):     at android.support.v4.widget.SwipeRefreshLayout.startRefresh(SwipeRefreshLayout.java:441)
05-25 21:55:59.804: E/AndroidRuntime(4665):     at android.support.v4.widget.SwipeRefreshLayout.onTouchEvent(SwipeRefreshLayout.java:399)
05-25 21:55:59.804: E/AndroidRuntime(4665):     at android.view.View.dispatchTouchEvent(View.java:7811)
05-25 21:55:59.804: E/AndroidRuntime(4665):     at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2210)
05-25 21:55:59.804: E/AndroidRuntime(4665):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1945)
05-25 21:55:59.804: E/AndroidRuntime(4665):     at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
05-25 21:55:59.804: E/AndroidRuntime(4665):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)
05-25 21:55:59.804: E/AndroidRuntime(4665):     at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
05-25 21:55:59.804: E/AndroidRuntime(4665):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)
05-25 21:55:59.804: E/AndroidRuntime(4665):     at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
05-25 21:55:59.804: E/AndroidRuntime(4665):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)
05-25 21:55:59.804: E/AndroidRuntime(4665):     at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
05-25 21:55:59.804: E/AndroidRuntime(4665):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)
05-25 21:55:59.804: E/AndroidRuntime(4665):     at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
05-25 21:55:59.804: E/AndroidRuntime(4665):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)
05-25 21:55:59.804: E/AndroidRuntime(4665):     at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
05-25 21:55:59.804: E/AndroidRuntime(4665):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)
05-25 21:55:59.804: E/AndroidRuntime(4665):     at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
05-25 21:55:59.804: E/AndroidRuntime(4665):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)
05-25 21:55:59.804: E/AndroidRuntime(4665):     at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
05-25 21:55:59.804: E/AndroidRuntime(4665):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)
05-25 21:55:59.804: E/AndroidRuntime(4665):     at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
05-25 21:55:59.804: E/AndroidRuntime(4665):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)
05-25 21:55:59.804: E/AndroidRuntime(4665):     at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
05-25 21:55:59.804: E/AndroidRuntime(4665):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)
05-25 21:55:59.804: E/AndroidRuntime(4665):     at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
05-25 21:55:59.804: E/AndroidRuntime(4665):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)
05-25 21:55:59.804: E/AndroidRuntime(4665):     at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
05-25 21:55:59.804: E/AndroidRuntime(4665):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)
05-25 21:55:59.804: E/AndroidRuntime(4665):     at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
05-25 21:55:59.804: E/AndroidRuntime(4665):     at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)
05-25 21:55:59.804: E/AndroidRuntime(4665):     at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2169)
05-25 21:55:59.804: E/AndroidRuntime(4665):     at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1613)
05-25 21:55:59.804: E/AndroidRuntime(4665):     at android.app.Activity.dispatchTouchEvent(Activity.java:2539)
05-25 21:55:59.804: E/AndroidRuntime(4665):     at android.support.v7.app.ActionBarActivityDelegateICS$WindowCallbackWrapper.dispatchTouchEvent(ActionBarActivityDelegateICS.java:268)
05-25 21:55:59.804: E/AndroidRuntime(4665):     at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2117)
05-25 21:55:59.804: E/AndroidRuntime(4665):     at android.view.View.dispatchPointerEvent(View.java:8005)
05-25 21:55:59.804: E/AndroidRuntime(4665):     at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:4300)
05-25 21:55:59.804: E/AndroidRuntime(4665):     at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:4179)
05-25 21:55:59.804: E/AndroidRuntime(4665):     at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3714)
05-25 21:55:59.804: E/AndroidRuntime(4665):     at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3764)
05-25 21:55:59.804: E/AndroidRuntime(4665):     at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3733)
05-25 21:55:59.804: E/AndroidRuntime(4665):     at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3844)
05-25 21:55:59.804: E/AndroidRuntime(4665):     at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3741)
05-25 21:55:59.804: E/AndroidRuntime(4665):     at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:3901)
05-25 21:55:59.804: E/AndroidRuntime(4665):     at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3714)
05-25 21:55:59.804: E/AndroidRuntime(4665):     at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3764)
05-25 21:55:59.804: E/AndroidRuntime(4665):     at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3733)
05-25 21:55:59.804: E/AndroidRuntime(4665):     at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3741)
05-25 21:55:59.804: E/AndroidRuntime(4665):     at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3714)
05-25 21:55:59.804: E/AndroidRuntime(4665):     at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:5973)
05-25 21:55:59.804: E/AndroidRuntime(4665):     at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.ja

Answer 1

SwipeRefreshLayout.java第441 SwipeRefreshLayout.java是

    mListener.onRefresh();

您是否OnRefreshListener提供了OnRefreshListener ？

Answer 2

轉到項目-> 屬性 -> Java Buildpath並添加支持庫V4 ， 並通過確保在勾號上打勾，從訂單和導出選項卡中檢查該庫。

Answer 3

這可能是因為您在SwipeRefreshLayout內部（即view_pager_item.xml中）具有view_pager_item.xml 。 因此，當SwipeRefreshLayout查找其上下文時，它將找到包含ViewPager的Activity或Fragment。

嘗試將SwipeRefreshLayout移到包含SwipeRefreshLayout的Activity或Fragment上，然后看看它如何進行。

Answer 4

您是否已使用偵聽器設置SwipeRefreshLayout視圖？

例如，如果您的片段/活動實現SwipeRefreshLayout.OnRefreshListener ，則需要將SwipeRefreshLayout實例設置為：

SwipeRefreshLayout layout = (SwipeRefreshLayout)view.findViewById(R.id.swipe);
layout.setOnRefreshListener(this);

這應該修復崩潰:)