java - 按下包含的布局部分时出现 NullPointerException

Question

好吧，

我的布局中包含一个静态 header ，其中包含一个 ListView 。该功能运行良好，但是每当我单击作业时它都会抛出 NullPointerException(我不希望发生任何事情)

不确定为什么会这样。

容器.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent"
  android:gravity="center"
  android:orientation="vertical" >

  <include android:id="@+id/headerItem"
           android:layout_alignParentTop="true"
           android:layout_width="fill_parent"
           android:layout_height="76dip"
           android:background="@color/standard_background"
           layout="@layout/List_Item"/>

  <ListView
      android:id="@id/android:list"
      android:layout_width="fill_parent"
      android:layout_height="fill_parent"
      android:layout_below="@+id/headerItem"
      android:background="@color/standard_background" />
</RelativeLayout>

List_Item.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="match_parent"
  android:layout_height="60dip"
  android:orientation="vertical"
  android:padding="8dp">
  <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="30dip"
    android:orientation="horizontal">

           ...a couple of textviews
    </LinearLayout>   
           ...a single textview
   </LinearLayout>

我试图将其设置为禁用、不可聚焦以及禁用单击和长按。不确定还能尝试什么。

堆栈跟踪

Exception in MessageQueue callback: handleReceiveCallback
 java.lang.NullPointerException
      at android.support.v4.widget.DrawerLayout.isContentView(DrawerLayout.java:840)
      at android.support.v4.widget.DrawerLayout.onInterceptTouchEvent(DrawerLayout.java:866)
      at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1859)
      at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
      at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1917)
      at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
      at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1917)
      at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
      at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1917)
      at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
      at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1917)
      at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2068)
      at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1515)
      at android.app.Activity.dispatchTouchEvent(Activity.java:2458)
      at android.support.v7.app.ActionBarActivityDelegateICS$WindowCallbackWrapper.dispatchTouchEvent(ActionBarActivityDelegateICS.java:255)
      at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2016)
      at android.view.View.dispatchPointerEvent(View.java:7886)
      at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:3954)
      at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:3833)
      at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3399)
      at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3449)
      at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3418)
      at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3525)
      at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3426)
      at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:3582)
      at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3399)
      at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3449)
      at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3418)
      at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3426)
      at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3399)
      at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:5602)
      at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:5582)
      at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:5553)
      at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:5682)
      at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:185)
      at android.os.MessageQueue.nativePollOnce(Native Method)
      at android.os.MessageQueue.next(MessageQueue.java:138)
      at android.os.Looper.loop(Looper.java:123)
      at android.app.ActivityThread.main(ActivityThread.java:5017)
      at java.lang.reflect.Method.invokeNative(Native Method)
      at java.lang.reflect.Method.invoke(Method.java:515)
      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
      at dalvik.system.NativeStart.main(Native Method)
shutting down VM
d=1: thread exiting with uncaught exception (group=0x41889ba8)
FATAL EXCEPTION: main
rocess: co.za.fieldservice.tcm, PID: 21008
ava.lang.NullPointerException
      at android.support.v4.widget.DrawerLayout.isContentView(DrawerLayout.java:840)
      at android.support.v4.widget.DrawerLayout.onInterceptTouchEvent(DrawerLayout.java:866)
      at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1859)
      at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
      at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1917)
      at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
      at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1917)
      at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
      at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1917)
      at android.view.ViewGroup.dispatchTransformedTouchEvent(ViewGroup.java:2216)
      at android.view.ViewGroup.dispatchTouchEvent(ViewGroup.java:1917)
      at com.android.internal.policy.impl.PhoneWindow$DecorView.superDispatchTouchEvent(PhoneWindow.java:2068)
      at com.android.internal.policy.impl.PhoneWindow.superDispatchTouchEvent(PhoneWindow.java:1515)
      at android.app.Activity.dispatchTouchEvent(Activity.java:2458)
      at android.support.v7.app.ActionBarActivityDelegateICS$WindowCallbackWrapper.dispatchTouchEvent(ActionBarActivityDelegateICS.java:255)
      at com.android.internal.policy.impl.PhoneWindow$DecorView.dispatchTouchEvent(PhoneWindow.java:2016)
      at android.view.View.dispatchPointerEvent(View.java:7886)
      at android.view.ViewRootImpl$ViewPostImeInputStage.processPointerEvent(ViewRootImpl.java:3954)
      at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:3833)
      at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3399)
      at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3449)
      at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3418)
      at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:3525)
      at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3426)
      at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:3582)
      at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3399)
      at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:3449)
      at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:3418)
      at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:3426)
      at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:3399)
      at android.view.ViewRootImpl.deliverInputEvent(ViewRootImpl.java:5602)
      at android.view.ViewRootImpl.doProcessInputEvents(ViewRootImpl.java:5582)
      at android.view.ViewRootImpl.enqueueInputEvent(ViewRootImpl.java:5553)
      at android.view.ViewRootImpl$WindowInputEventReceiver.onInputEvent(ViewRootImpl.java:5682)
      at android.view.InputEventReceiver.dispatchInputEvent(InputEventReceiver.java:185)
      at android.os.MessageQueue.nativePollOnce(Native Method)
      at android.os.MessageQueue.next(MessageQueue.java:138)
      at android.os.Looper.loop(Looper.java:123)
      at android.app.ActivityThread.main(ActivityThread.java:5017)
      at java.lang.reflect.Method.invokeNative(Native Method)
      at java.lang.reflect.Method.invoke(Method.java:515)
      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
      at dalvik.system.NativeStart.main(Native Method)

DrawerLayout.xml

<FrameLayout
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
  <android.support.v4.widget.DrawerLayout
      android:id="@+id/drawer_layout"
      android:layout_width="match_parent"
      android:layout_height="match_parent" >
    <!-- The navigation drawer -->
    <LinearLayout
        android:id="@+id/drawer"
        android:layout_width="240dp"
        android:layout_height="match_parent"
        android:orientation="vertical"
        android:layout_gravity="start" >

      <ListView android:id="@+id/drawer_list"
          android:layout_width="match_parent"
          android:layout_height="match_parent"
          android:choiceMode="multipleChoice"
          android:divider="@color/light_gray"
          android:dividerHeight="0.1dp"
          android:background="@color/standard_background"/>

    </LinearLayout>
  </android.support.v4.widget.DrawerLayout>
  <!-- The main content view -->
  <FrameLayout
      android:id="@+id/content_frame"
      android:layout_width="match_parent"
      android:layout_height="match_parent"
      android:layout_marginLeft="@dimen/drawer_content_padding"
      />
</FrameLayout>

Answer 1

问题出在抽屉布局上。

抽屉的宽度设置为match_parent，从而使其覆盖一些其他 View 并导致在按任何地方(空白处的任何地方)时发生异常。

当我将宽度更改为与我的 content_frame 左边距值相同的值时，一切正常。