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Asked: 2026-05-26T08:21:47+00:00

When I restart my app after its been killed (after an hour or so

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When I restart my app after its been killed (after an hour or so by android or if I kill it via task killer), the app crashes with the following message:

10-23 09:07:41.120: ERROR/AndroidRuntime(647): FATAL EXCEPTION: main
10-23 09:07:41.120: ERROR/AndroidRuntime(647): java.lang.RuntimeException: Unable to start activity ComponentInfo{ com.test.testapp /com.test.testapp.TestingActivity}: java.lang.NullPointerException
10-23 09:07:41.120: ERROR/AndroidRuntime(647): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2663)
10-23 09:07:41.120: ERROR/AndroidRuntime(647): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
10-23 09:07:41.120: ERROR/AndroidRuntime(647): at android.app.ActivityThread.access$2300(ActivityThread.java:125)
10-23 09:07:41.120: ERROR/AndroidRuntime(647): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
10-23 09:07:41.120: ERROR/AndroidRuntime(647): at android.os.Handler.dispatchMessage(Handler.java:99)
10-23 09:07:41.120: ERROR/AndroidRuntime(647): at android.os.Looper.loop(Looper.java:123)
10-23 09:07:41.120: ERROR/AndroidRuntime(647): at android.app.ActivityThread.main(ActivityThread.java:4627)
10-23 09:07:41.120: ERROR/AndroidRuntime(647): at java.lang.reflect.Method.invokeNative(Native Method)
10-23 09:07:41.120: ERROR/AndroidRuntime(647): at java.lang.reflect.Method.invoke(Method.java:521)
10-23 09:07:41.120: ERROR/AndroidRuntime(647): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
10-23 09:07:41.120: ERROR/AndroidRuntime(647): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
10-23 09:07:41.120: ERROR/AndroidRuntime(647): at dalvik.system.NativeStart.main(Native Method)
10-23 09:07:41.120: ERROR/AndroidRuntime(647): Caused by: java.lang.NullPointerException
10-23 09:07:41.120: ERROR/AndroidRuntime(647): at com.test.testapp.TestingActivity.onCreate(TestingActivity.java:178)
10-23 09:07:41.120: ERROR/AndroidRuntime(647): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
10-23 09:07:41.120: ERROR/AndroidRuntime(647): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2627)

I have a timer in that activity and I thought maybe it had something to do with that thread but even if I remove the timer it still crashes. I really can’t figure out what’s wrong here. Any ideas?

Thanks in advance

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1 Answer

  1. Editorial Team

    Android will reclaim memory. You need to check it’s not null. It says which line is complaining too

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