andriod中运行登录程序时app退出，求解

Question

12-06 20:01:31.438 12197-13159/? E/ws000﹕ begin call prefClean
12-06 20:01:31.438 12197-13159/? E/ws000﹕ end call prefClean
12-06 20:01:31.968 1964-1998/? E/ProcessStats﹕ Starting service ServiceState{42528fc8 com.oppo.virusdetect.tmsecure.SecureService pkg=com.oppo.virusdetect proc=42528fc8} without owner
12-06 20:01:32.008 12729-12729/? E/ClearRunningAppService﹕ onStartCommand android.intent.action.OPPO_ON_TRIM_MEMORY
12-06 20:01:32.018 12729-13164/? E/ClearRunningAppService﹕ ClearPersisentRunning packageName =com.android.dialer
12-06 20:01:32.018 12729-13164/? E/ClearRunningAppService﹕ ClearPersisentRunning runningAppProcessInfo.pid =13074
12-06 20:01:32.018 12729-13164/? E/ClearRunningAppService﹕ ClearPersisentRunning success
12-06 20:01:32.738 12514-12514/? E/Parcel﹕ Reading a NULL string not supported here.
12-06 20:01:32.788 13165-13165/? E/Parcel﹕ Reading a NULL string not supported here.
12-06 20:01:32.808 12514-12573/? E/AndroidRuntime﹕ FATAL EXCEPTION: AsyncTask #4
Process: com.thinkpad.redemo, PID: 12514
java.lang.RuntimeException: An error occured while executing doInBackground()
at android.os.AsyncTask$3.done(AsyncTask.java:300)
at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:355)
at java.util.concurrent.FutureTask.setException(FutureTask.java:222)
at java.util.concurrent.FutureTask.run(FutureTask.java:242)
at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
at java.lang.Thread.run(Thread.java:841)
Caused by: java.lang.NullPointerException
at com.thinkpad.redemo.LandActivity.gotoLogin(LandActivity.java:127)
at com.thinkpad.redemo.LandActivity.access$300(LandActivity.java:23)
at com.thinkpad.redemo.LandActivity$2.doInBackground(LandActivity.java:67)
at com.thinkpad.redemo.LandActivity$2.doInBackground(LandActivity.java:55)
at android.os.AsyncTask$2.call(AsyncTask.java:288)
at java.util.concurrent.FutureTask.run(FutureTask.java:237)
            at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)
            at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
            at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
            at java.lang.Thread.run(Thread.java:841)
12-06 20:01:32.818 13165-13165/? E/Parcel﹕ Reading a NULL string not supported here.
12-06 20:01:32.828 13165-13165/? E/Parcel﹕ Reading a NULL string not supported here.
12-06 20:01:32.828 13165-13165/? E/Parcel﹕ Reading a NULL string not supported here.
12-06 20:01:32.848 13165-13165/? E/Parcel﹕ Reading a NULL string not supported here.
12-06 20:01:32.848 13165-13165/? E/Parcel﹕ Reading a NULL string not supported here.
12-06 20:01:32.858 13165-13165/? E/Parcel﹕ Reading a NULL string not supported here.
12-06 20:01:32.858 13165-13165/? E/Parcel﹕ Reading a NULL string not supported here.
12-06 20:01:32.858 13165-13165/? E/Parcel﹕ Reading a NULL string not supported here.
12-06 20:01:32.858 1964-1978/? E/OppoPhoneWindow﹕ OppoPhoneWindow
12-06 20:01:32.868 13165-13165/? E/Parcel﹕ Reading a NULL string not supported here.
12-06 20:01:32.868 13165-13165/? E/Parcel﹕ Reading a NULL string not supported here.
12-06 20:01:32.868 13165-13165/? E/Parcel﹕ Reading a NULL string not supported here.
12-06 20:01:32.878 2197-2197/? E/Parcel﹕ Reading a NULL string not supported here.
12-06 20:01:33.018 1964-1977/? E/JavaBinder﹕ !!! FAILED BINDER TRANSACTION !!!
12-06 20:01:33.028 1964-1977/? E/JavaBinder﹕ !!! FAILED BINDER TRANSACTION !!!
12-06 20:01:33.038 1964-2089/? E/JavaBinder﹕ !!! FAILED BINDER TRANSACTION !!!
12-06 20:01:33.038 1964-2089/? E/JavaBinder﹕ !!! FAILED BINDER TRANSACTION !!!
12-06 20:01:33.038 2271-2271/? E/JavaBinder﹕ !!! FAILED BINDER TRANSACTION !!!
12-06 20:01:33.038 2271-2271/? E/JavaBinder﹕ !!! FAILED BINDER TRANSACTION !!!
12-06 20:01:33.108 1964-1964/? E/NotificationService﹕ Suppressing notification from package com.qihoo360.mobilesafe by user request.
12-06 20:01:33.658 13183-13183/? E/Parcel﹕ Reading a NULL string not supported here.
12-06 20:01:33.688 13183-13183/? E/Parcel﹕ Reading a NULL string not supported here.
12-06 20:01:33.688 13183-13183/? E/Parcel﹕ Reading a NULL string not supported here.
12-06 20:01:33.688 13183-13183/? E/Parcel﹕ Reading a NULL string not supported here.
12-06 20:01:33.698 13183-13183/? E/Parcel﹕ Reading a NULL string not supported here.
12-06 20:01:33.698 13183-13183/? E/Parcel﹕ Reading a NULL string not supported here.
12-06 20:01:33.698 13183-13183/? E/Parcel﹕ Reading a NULL string not supported here.
12-06 20:01:33.698 13183-13183/? E/Parcel﹕ Reading a NULL string not supported here.
12-06 20:01:33.698 13183-13183/? E/Parcel﹕ Reading a NULL string not supported here.
12-06 20:01:33.708 13183-13183/? E/Parcel﹕ Reading a NULL string not supported here.
12-06 20:01:33.708 13183-13183/? E/Parcel﹕ Reading a NULL string not supported here.
12-06 20:01:33.708 13183-13183/? E/Parcel﹕ Reading a NULL string not supported here.
12-06 20:01:33.738 13183-13183/? E/Parcel﹕ Reading a NULL string not supported here.
12-06 20:01:33.748 13165-13165/? E/Parcel﹕ Reading a NULL string not supported here.
12-06 20:01:33.758 13183-13183/? E/Parcel﹕ Reading a NULL string not supported here.
12-06 20:01:33.758 13183-13183/? E/Parcel﹕ Reading a NULL string not supported here.
12-06 20:01:33.758 13183-13183/? E/Parcel﹕ Reading a NULL string not supported here.
12-06 20:01:33.778 13183-13183/? E/Parcel﹕ Reading a NULL string not supported here.
12-06 20:01:33.778 13183-13183/? E/Parcel﹕ Reading a NULL string not supported here.
12-06 20:01:33.788 13183-13183/? E/Parcel﹕ Reading a NULL string not supported here.
12-06 20:01:33.908 13183-13183/? E/Parcel﹕ Reading a NULL string not supported here.
12-06 20:01:33.918 13183-13183/? E/Parcel﹕ Reading a NULL string not supported here.
12-06 20:01:33.928 13183-13183/? E/Parcel﹕ Reading a NULL string not supported here.
12-06 20:01:33.938 13183-13183/? E/Parcel﹕ Reading a NULL string not supported here.
12-06 20:01:33.968 13183-13183/? E/Parcel﹕ Reading a NULL string not supported here.
12-06 20:01:33.988 13183-13183/? E/Parcel﹕ Reading a NULL string not supported here.
12-06 20:01:34.618 13183-13183/? E/Parcel﹕ Reading a NULL string not supported here.
12-06 20:01:34.918 13165-13165/? E/Parcel﹕ Reading a NULL string not supported here.
12-06 20:01:34.928 13165-13165/? E/Parcel﹕ Reading a NULL string not supported here.
12-06 20:01:36.628 13226-13226/? E/Parcel﹕ Reading a NULL string not supported here.
12-06 20:01:36.668 13226-13226/? E/Parcel﹕ Reading a NULL string not supported here.
12-06 20:01:36.668 13226-13226/? E/Parcel﹕ Reading a NULL string not supported here.
12-06 20:01:36.668 13226-13226/? E/Parcel﹕ Reading a NULL string not supported here.
12-06 20:01:36.678 13226-13226/? E/Parcel﹕ Reading a NULL string not supported here.
12-06 20:01:36.678 13226-13226/? E/Parcel﹕ Reading a NULL string not supported here.
12-06 20:01:36.678 13226-13226/? E/Parcel﹕ Reading a NULL string not supported here.
12-06 20:01:36.678 13226-13226/? E/Parcel﹕ Reading a NULL string not supported here.
12-06 20:01:36.688 13226-13226/? E/Parcel﹕ Reading a NULL string not supported here.
12-06 20:01:36.708 12729-12729/? E/ClearRunningAppService﹕ onStartCommand android.intent.action.OPPO_ON_TRIM_MEMORY
12-06 20:01:36.708 12729-13240/? E/ClearRunningAppService﹕ ClearPersisentRunning packageName =com.oppo.virusdetect
12-06 20:01:36.708 12729-13240/? E/ClearRunningAppService﹕ ClearPersisentRunning runningAppProcessInfo.pid =13226
12-06 20:01:36.708 12729-13240/? E/ClearRunningAppService﹕ ClearPersisentRunning success
12-06 20:01:36.718 12729-13240/? E/ClearRunningAppService﹕ ClearPersisentRunning packageName =com.android.dialer
12-06 20:01:36.718 12729-13240/? E/ClearRunningAppService﹕ ClearPersisentRunning runningAppProcessInfo.pid =13165
12-06 20:01:36.718 12729-13240/? E/ClearRunningAppService﹕ ClearPersisentRunning success
12-06 20:01:43.128 1964-1964/? E/NotificationService﹕ Suppressing notification from package com.qihoo360.mobilesafe by user request.
12-06 20:01:44.558 12402-12402/? E/Parcel﹕ Reading a NULL string not supported here.
12-06 20:01:44.578 12471-12471/? E/Parcel﹕ Reading a NULL string not supported here.
12-06 20:01:44.598 1964-2089/? E/ProcessStats﹕ Starting service ServiceState{42528fc8 com.oppo.virusdetect.tmsecure.SecureService pkg=com.oppo.virusdetect proc=42528fc8} without owner
12-06 20:01:46.588 12402-13262/? E/ws000﹕ begin call prefClean
12-06 20:01:46.588 12402-13262/? E/ws000﹕ end call prefClean
12-06 20:01:46.598 12471-13261/? E/ws000﹕ begin call prefClean
12-06 20:01:46.598 12471-13261/? E/ws000﹕ end call prefClean
12-06 20:01:47.168 1964-1974/? E/ProcessStats﹕ Starting service ServiceState{42528fc8 com.oppo.virusdetect.tmsecure.SecureService pkg=com.oppo.virusdetect proc=42528fc8} without owner
12-06 20:01:47.198 12729-12729/? E/ClearRunningAppService﹕ onStartCommand android.intent.action.OPPO_ON_TRIM_MEMORY
12-06 20:01:47.208 12729-13265/? E/ClearRunningAppService﹕ ClearPersisentRunning packageName =com.android.dialer
12-06 20:01:47.208 12729-13265/? E/ClearRunningAppService﹕ ClearPersisentRunning runningAppProcessInfo.pid =13241
12-06 20:01:47.208 12729-13265/? E/ClearRunningAppService﹕ ClearPersisentRunning success

Answer 1

Caused by: java.lang.NullPointerException
at com.thinkpad.redemo.LandActivity.gotoLogin(LandActivity.java:127)
127行，报空指针，你检查下