在android中绘制视图时意外崩溃[关闭]

Question

我正在编写音乐播放器应用程序，我重用了单个片段来显示回收器视图，以便按标题、艺术家、专辑和流派对音乐进行分类。

我使用这个库https://github.com/FutureMind/recycler-fast-scroll 来快速滚动部分。图书馆在我的标题、艺术家和专辑的音乐中运行良好。当我尝试切换到流派选项卡时，应用程序强制以异常关闭。所有 4 个片段的代码完全相同。 在跟踪日志中，我的代码没有任何痕迹，我无法弄清楚我应该在哪里查看我的代码来解决这个问题。在此处附加跟踪日志，不胜感激。

12-10 19:09:08.204 16317-16317/com.bhandari.player.music.musicplayer E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.bhandari.player.music.musicplayer, PID: 16317
Theme: themes:{}
java.lang.NullPointerException: Attempt to invoke virtual method 'void android.view.View.setOnTouchListener(android.view.View$OnTouchListener)' on a null object reference
   at com.futuremind.recyclerviewfastscroll.FastScroller.initHandleMovement(FastScroller.java:186)
   at com.futuremind.recyclerviewfastscroll.FastScroller.onLayout(FastScroller.java:162)
   at android.view.View.layout(View.java:16639)
   at android.view.ViewGroup.layout(ViewGroup.java:5437)
   at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1079)
   at android.view.View.layout(View.java:16639)
   at android.view.ViewGroup.layout(ViewGroup.java:5437)
   at android.support.v4.view.ViewPager.onLayout(ViewPager.java:1799)
   at android.view.View.layout(View.java:16639)
   at android.view.ViewGroup.layout(ViewGroup.java:5437)
   at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1079)
   at android.view.View.layout(View.java:16639)
   at android.view.ViewGroup.layout(ViewGroup.java:5437)
   at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1735)
   at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1579)
   at android.widget.LinearLayout.onLayout(LinearLayout.java:1488)
   at android.view.View.layout(View.java:16639)
   at android.view.ViewGroup.layout(ViewGroup.java:5437)
   at android.support.design.widget.CoordinatorLayout.layoutChild(CoordinatorLayout.java:1142)
   at android.support.design.widget.CoordinatorLayout.onLayoutChild(CoordinatorLayout.java:836)
   at android.support.design.widget.CoordinatorLayout.onLayout(CoordinatorLayout.java:850)
   at android.view.View.layout(View.java:16639)
   at android.view.ViewGroup.layout(ViewGroup.java:5437)
   at android.support.v4.widget.DrawerLayout.onLayout(DrawerLayout.java:1193)
   at android.view.View.layout(View.java:16639)
   at android.view.ViewGroup.layout(ViewGroup.java:5437)
   at android.support.design.widget.CoordinatorLayout.layoutChild(CoordinatorLayout.java:1142)
   at android.support.design.widget.CoordinatorLayout.onLayoutChild(CoordinatorLayout.java:836)
   at android.support.design.widget.CoordinatorLayout.onLayout(CoordinatorLayout.java:850)
   at android.view.View.layout(View.java:16639)
   at android.view.ViewGroup.layout(ViewGroup.java:5437)
   at android.widget.FrameLayout.layoutChildren(FrameLayout.java:336)
   at android.widget.FrameLayout.onLayout(FrameLayout.java:273)
   at android.view.View.layout(View.java:16639)
   at android.view.ViewGroup.layout(ViewGroup.java:5437)
   at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1735)
   at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1579)
   at android.widget.LinearLayout.onLayout(LinearLayout.java:1488)
   at android.view.View.layout(View.java:16639)
   at android.view.ViewGroup.layout(ViewGroup.java:5437)
   at android.widget.FrameLayout.layoutChildren(FrameLayout.java:336)
   at android.widget.FrameLayout.onLayout(FrameLayout.java:273)
   at android.view.View.layout(View.java:16639)
   at android.view.ViewGroup.layout(ViewGroup.java:5437)
   at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1735)
   at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1579)
   at android.widget.LinearLayout.onLayout(LinearLayout.java:1488)
   at android.view.View.layout(View.java:16639)
   at android.view.ViewGroup.layout(ViewGroup.java:5437)
   at android.widget.FrameLayout.layoutChildren(FrameLayout.java:336)
   at android.widget.FrameLayout.onLayout(FrameLayout.java:273)
   at com.android.internal.policy.PhoneWindow$DecorView.onLayout(PhoneWindow.java:2934)
   at android.view.View.layout(View.java:16639)
   at android.view.ViewGroup.layout(ViewGroup.java:5437)
   at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2179)
   at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1939)
   at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1115)
   at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6023)
   at android.view.Choreographer$CallbackRecord.run(Choreographer.java:858)
at andro

Answer 1

不用担心，我自己解决了。 这是由于我为显示文件夹而创建的其他选项卡造成的。我为此使用了不同的片段，忘记将滚动条初始化为那个。