如何以较少的日志信息确定NullPointerException以拥有自己的源代码？

Question

在程序执行时，我收到错误消息：

FATAL EXCEPTION: main E/AndroidRuntime( 2977): java.lang.NullPointerException。

底部消息仅对自写源代码提供了一个小提示。但是缺少错误代码行号的详细信息。有哪些可能性可以获取包含更具体信息的日志输出来说明异常的根本原因？在这个问题中，我不想知道代码中的错误是什么。我的问题是：

要如何检测自己的代码错误？

例如，可以使用android调试管理器查询更多信息吗？还是还有其他可能性？它是javac命令行编程。不得使用Android Studio。我希望调试解决方案的基本选项应该独立于是否使用IDE。

对于当前示例，这是日志输出：

D/AndroidRuntime( 2977): Shutting down VM
W/dalvikvm( 2977): threadid=1: thread exiting with uncaught exception (group=0xa5000678)
E/AndroidRuntime( 2977): FATAL EXCEPTION: main
E/AndroidRuntime( 2977): java.lang.NullPointerException
E/AndroidRuntime( 2977): at android.support.v7.widget.RecyclerView.onMeasure(RecyclerView.java:1764)
E/AndroidRuntime( 2977): at android.view.View.measure(View.java:15848)
E/AndroidRuntime( 2977): at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:728)
E/AndroidRuntime( 2977): at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:477)
E/AndroidRuntime( 2977): at android.view.View.measure(View.java:15848)
E/AndroidRuntime( 2977): at android.support.v7.widget.RecyclerView$LayoutManager.measureChildWithMargins(RecyclerView.java:5555)
E/AndroidRuntime( 2977): at android.support.v7.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1332)
E/AndroidRuntime( 2977): at android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1269)
E/AndroidRuntime( 2977): at android.support.v7.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:523)
E/AndroidRuntime( 2977): at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:1988)
E/AndroidRuntime( 2977): at android.support.v7.widget.RecyclerView.onLayout(RecyclerView.java:2237)
E/AndroidRuntime( 2977): at android.view.View.layout(View.java:14289)
E/AndroidRuntime( 2977): at android.view.ViewGroup.layout(ViewGroup.java:4562)
E/AndroidRuntime( 2977): at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1076)
E/AndroidRuntime( 2977): at android.view.View.layout(View.java:14289)
E/AndroidRuntime( 2977): at android.view.ViewGroup.layout(ViewGroup.java:4562)
E/AndroidRuntime( 2977): at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
E/AndroidRuntime( 2977): at android.view.View.layout(View.java:14289)
E/AndroidRuntime( 2977): at android.view.ViewGroup.layout(ViewGroup.java:4562)
E/AndroidRuntime( 2977): at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
E/AndroidRuntime( 2977): at android.view.View.layout(View.java:14289)
E/AndroidRuntime( 2977): at android.view.ViewGroup.layout(ViewGroup.java:4562)
E/AndroidRuntime( 2977): at android.widget.FrameLayout.onLayout(FrameLayout.java:448)
E/AndroidRuntime( 2977): at android.view.View.layout(View.java:14289)
E/AndroidRuntime( 2977): at android.view.ViewGroup.layout(ViewGroup.java:4562)
E/AndroidRuntime( 2977): at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:1976)
E/AndroidRuntime( 2977): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1730)
E/AndroidRuntime( 2977): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1004)
E/AndroidRuntime( 2977): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5481)
E/AndroidRuntime( 2977): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:749)
E/AndroidRuntime( 2977): at android.view.Choreographer.doCallbacks(Choreographer.java:562)
E/AndroidRuntime( 2977): at android.view.Choreographer.doFrame(Choreographer.java:532)
E/AndroidRuntime( 2977): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:735)
E/AndroidRuntime( 2977): at android.os.Handler.handleCallback(Handler.java:730)
E/AndroidRuntime( 2977): at android.os.Handler.dispatchMessage(Handler.java:92)
E/AndroidRuntime( 2977): at android.os.Looper.loop(Looper.java:137)
E/AndroidRuntime( 2977): at android.app.ActivityThread.main(ActivityThread.java:5103)
E/AndroidRuntime( 2977): at java.lang.reflect.Method.invokeNative(Native Method)
E/AndroidRuntime( 2977): at java.lang.reflect.Method.invoke(Method.java:525)
E/AndroidRuntime( 2977): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:737)
E/AndroidRuntime( 2977): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
E/AndroidRuntime( 2977): at dalvik.system.NativeStart.main(Native Method)
D/dalvikvm( 2977): GC_CONCURRENT freed 206K, 26% free 2638K/3556K, paused 2ms+1ms, total 10ms
W/ActivityManager( 1448):   Force finishing activity com.mypackage/.PopupWindow
I/WindowManager( 1448): Screenshot max retries 4 of Token{a592d048 ActivityRecord{a56d4960 u0 com.mypackage/.PopupWindow}} appWin=Window{a5503378 u0 com.mypackage/com.mypackage.PopupWindow} drawState=1
W/WindowManager( 1448): Screenshot failure taking screenshot for (1080x1920) to layer 21015

Answer 1

您知道在哪里引发异常吗？需要更多信息，例如您的主要内容]