在SwipeRefreshLayout异常调度输入事件和空指针异常拉下 [英] Exception Dispatching Input Event and Null Pointer Exception on SwipeRefreshLayout Pull down

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本文介绍了在SwipeRefreshLayout异常调度输入事件和空指针异常拉下的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我有一个刷卡刷新布局（android.support.v4版本19.1的一部分），当我向下滑动，在布局上我能去上部满了点，但向下滑动，进一步会导致应用程序崩溃，并且logcat的指向我的code没有具体的线路。由于SwipeRefreshLayout只有一对夫妇个月大的，他们是不是很多互联网上的信息，以帮助我找出问题所在。我遇到了麻烦加入支持V4版本19.1到我的构建路径之前，但​​我pretty相信我固定的。这里是logcat的，与布局文件和code为我SwipeRefreshLayout一起。随着应用程序崩溃时的屏幕截图。

I have a swipe to refresh layout (part of android.support.v4 revision 19.1), and when I swipe down on the layout I can get to the point where the top part is full, but swiping down any further will cause the app to crash, and the logcat points to no specific line in my code. Since SwipeRefreshLayout is only a couple of months old, their is not a lot of information on the internet to help me figure out what the problem is. Before I was having trouble adding the support v4 revision 19.1 to my build path, but I'm pretty sure I fixed that. Here is the logcat, along with the layout file and the code for my SwipeRefreshLayout. Along with a screenshot of when the app crashes.

06-18 23:09:31.527: E/InputEventReceiver(25459): Exception dispatching input event.
06-18 23:09:31.547: E/AndroidRuntime(25459): FATAL EXCEPTION: main
06-18 23:09:31.547: E/AndroidRuntime(25459): Process: com.bernard.beaconportal, PID: 25459
06-18 23:09:31.547: E/AndroidRuntime(25459): java.lang.NullPointerException
06-18 23:09:31.547: E/AndroidRuntime(25459):    at android.support.v4.widget.SwipeRefreshLayout.startRefresh(SwipeRefreshLayout.java:441)
06-18 23:09:31.547: E/AndroidRuntime(25459):    at android.support.v4.widget.SwipeRefreshLayout.onTouchEvent(SwipeRefreshLayout.java:399)
06-18 23:09:31.547: E/AndroidRuntime(25459):    at android.view.View.dispatchTouchEvent(View.java:7706)
06-18 23:09:31.547: E/AndroidRuntime(25459):    at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2210)
06-18 23:09:31.547: E/AndroidRuntime(25459):    at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1945)
06-18 23:09:31.547: E/AndroidRuntime(25459):    at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
06-18 23:09:31.547: E/AndroidRuntime(25459):    at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)
06-18 23:09:31.547: E/AndroidRuntime(25459):    at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
06-18 23:09:31.547: E/AndroidRuntime(25459):    at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)
06-18 23:09:31.547: E/AndroidRuntime(25459):    at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
06-18 23:09:31.547: E/AndroidRuntime(25459):    at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)
06-18 23:09:31.547: E/AndroidRuntime(25459):    at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
06-18 23:09:31.547: E/AndroidRuntime(25459):    at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)
06-18 23:09:31.547: E/AndroidRuntime(25459):    at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
06-18 23:09:31.547: E/AndroidRuntime(25459):    at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)
06-18 23:09:31.547: E/AndroidRuntime(25459):    at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
06-18 23:09:31.547: E/AndroidRuntime(25459):    at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)
06-18 23:09:31.547: E/AndroidRuntime(25459):    at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
06-18 23:09:31.547: E/AndroidRuntime(25459):    at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)
06-18 23:09:31.547: E/AndroidRuntime(25459):    at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
06-18 23:09:31.547: E/AndroidRuntime(25459):    at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)
06-18 23:09:31.547: E/AndroidRuntime(25459):    at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
06-18 23:09:31.547: E/AndroidRuntime(25459):    at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1959)
06-18 23:09:31.547: E/AndroidRuntime(25459):    at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2339)
06-18 23:09:31.547: E/AndroidRuntime(25459):    at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1569)
06-18 23:09:31.547: E/AndroidRuntime(25459):    at android.app.Activity.dispatchTouchEvent(Activity.java:2492)
06-18 23:09:31.547: E/AndroidRuntime(25459):    at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2286)
06-18 23:09:31.547: E/AndroidRuntime(25459):    at android.view.View.dispatchPointerEvent(View.java:7886)
06-18 23:09:31.547: E/AndroidRuntime(25459):    at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:3947)
06-18 23:09:31.547: E/AndroidRuntime(25459):    at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:3826)
06-18 23:09:31.547: E/AndroidRuntime(25459):    at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3392)
06-18 23:09:31.547: E/AndroidRuntime(25459):    at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3442)
06-18 23:09:31.547: E/AndroidRuntime(25459):    at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3411)
06-18 23:09:31.547: E/AndroidRuntime(25459):    at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3518)
06-18 23:09:31.547: E/AndroidRuntime(25459):    at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3419)
06-18 23:09:31.547: E/AndroidRuntime(25459):    at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:3575)
06-18 23:09:31.547: E/AndroidRuntime(25459):    at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3392)
06-18 23:09:31.547: E/AndroidRuntime(25459):    at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3442)
06-18 23:09:31.547: E/AndroidRuntime(25459):    at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3411)
06-18 23:09:31.547: E/AndroidRuntime(25459):    at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3419)
06-18 23:09:31.547: E/AndroidRuntime(25459):    at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3392)
06-18 23:09:31.547: E/AndroidRuntime(25459):    at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:5532)
06-18 23:09:31.547: E/AndroidRuntime(25459):    at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:5512)
06-18 23:09:31.547: E/AndroidRuntime(25459):    at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:5483)
06-18 23:09:31.547: E/AndroidRuntime(25459):    at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:5612)
06-18 23:09:31.547: E/AndroidRuntime(25459):    at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:185)
06-18 23:09:31.547: E/AndroidRuntime(25459):    at android.view.InputEventReceiver.nativeConsumeBatchedInputEvents(Native Method)
06-18 23:09:31.547: E/AndroidRuntime(25459):    at android.view.InputEventReceiver.consumeBatchedInputEvents(InputEventReceiver.java:176)
06-18 23:09:31.547: E/AndroidRuntime(25459):    at android.view.ViewRootImpl.doConsumeBatchedInput(ViewRootImpl.java:5585)
06-18 23:09:31.547: E/AndroidRuntime(25459):    at android.view.ViewRootImpl$ConsumeBatchedInputRunnable.run(ViewRootImpl.java:5631)
06-18 23:09:31.547: E/AndroidRuntime(25459):    at android.view.Choreographer$CallbackRecord.run(Choreographer.java:761)
06-18 23:09:31.547: E/AndroidRuntime(25459):    at android.view.Choreographer.doCa

下面是布局

<android.support.v4.widget.SwipeRefreshLayout 
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="#ffffff"
    android:id="@+id/swipe" >

    <ListView
        android:id="@+id/listView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        android:layout_alignParentLeft="true"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
         android:background="#ffffff">

    </ListView>
</android.support.v4.widget.SwipeRefreshLayout>

这里是code与SwipeRefreshLayout涉及

here is the code that deals with SwipeRefreshLayout

SwipeRefreshLayout swipeLayout; 


    public static final String KEY_HOMEWORK="homework";
    public static final String KEY_DESC="desc";

    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){


         View swipe = inflater.inflate(R.layout.activity_main, container, false); 

         swipeLayout = (SwipeRefreshLayout) swipe.findViewById(R.id.swipe);

         swipeLayout.setEnabled(false);

    ListView lView = (ListView) swipe.findViewById(R.id.listView1);

    lView.setOnScrollListener(new AbsListView.OnScrollListener() {
        @Override
        public void onScrollStateChanged(AbsListView absListView, int i) {

        }

        @Override
        public void onScroll(AbsListView absListView, int firstVisibleItem, int visibleItemCount, int totalItemCount) {
                if (firstVisibleItem == 0)
                    swipeLayout.setEnabled(true);
                else
                    swipeLayout.setEnabled(false);
        }
    });


    return swipe;

    }

这是它崩溃，因为你可以看到它已经一路下跌刷卡，通常它会触发在这一点上的东西截图。但随后崩溃。

And here is a screenshot of it crashing, as you can see it has been swiped all the way down, and normally it would trigger something at this point. But then it crashes.

推荐答案

您 OnRefreshListener 为空，或者您没有设置一个或你的$ C的某些点$ C你将其设置为null。

Your OnRefreshListener is null, either you haven't set one or at some point of your code you are setting it to null.

在源 SwipeRefreshLayout ，尤其是在这个段

 private void startRefresh() {
        removeCallbacks(mCancel);
        mReturnToStartPosition.run();
        setRefreshing(true);
        mListener.onRefresh();
    }

这行441，在 mListener.onRefresh（）; 引发 NullPointerException异常。

on line 441, the mListener.onRefresh(); raises NullPointerException.

这篇关于在SwipeRefreshLayout异常调度输入事件和空指针异常拉下的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！

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