android - 我的应用程序崩溃报告来自 google play cosole

Question

我是 android 开发新手。我开发了一个应用程序并将其发布到 google play，但最近我发现了崩溃报告，因为许多崩溃发生在代码的特定部分，如下所示。我想不明白。

java.lang.RuntimeException: 
 at android.app.ActivityThread.performLaunchActivity 
 (ActivityThread.java:2643)
 at android.app.ActivityThread.handleLaunchActivity 
 (ActivityThread.java:2709)
 at android.app.ActivityThread.access$1000 (ActivityThread.java:196)
 at android.app.ActivityThread$H.handleMessage 
 (ActivityThread.java:1534)
 at android.os.Handler.dispatchMessage (Handler.java:111)
 at android.os.Looper.loop (Looper.java:207)
 at android.app.ActivityThread.main (ActivityThread.java:5867)
 at java.lang.reflect.Method.invoke (Native Method)
 at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run 
 (ZygoteInit.java:1026)
 at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:887)
Caused by: java.lang.NullPointerException: 
 at local.app.user.myapp.MainActivity.onCreate 
 (MainActivity.java:154)
 at android.app.Activity.performCreate (Activity.java:6285)
 at android.app.Instrumentation.callActivityOnCreate   ( 
 Instrumentation.java:1119)
 at android.app.ActivityThread.performLaunchActivity 
 (ActivityThread.java:2596)