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Editorial Team
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Asked: 2026-06-03T13:41:40+00:00

My app has stopped working on the emulatorUnfortunately. I have the logcat with me,

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My app has stopped working on the emulator”Unfortunately”. I have the logcat with me, however I dont understand how to solve the errors. Please help me. Thanks in advance. Here’s the logcat

05-07 14:34:01.302: E/AndroidRuntime(713): FATAL EXCEPTION: main
05-07 14:34:01.302: E/AndroidRuntime(713): java.lang.RuntimeException: Unable to start activity ComponentInfo{my.calc/my.calc.CalcActivity}: java.lang.NullPointerException
05-07 14:34:01.302: E/AndroidRuntime(713):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)
05-07 14:34:01.302: E/AndroidRuntime(713):  at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
05-07 14:34:01.302: E/AndroidRuntime(713):  at android.app.ActivityThread.access$600(ActivityThread.java:123)
05-07 14:34:01.302: E/AndroidRuntime(713):  at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
05-07 14:34:01.302: E/AndroidRuntime(713):  at android.os.Handler.dispatchMessage(Handler.java:99)
05-07 14:34:01.302: E/AndroidRuntime(713):  at android.os.Looper.loop(Looper.java:137)
05-07 14:34:01.302: E/AndroidRuntime(713):  at android.app.ActivityThread.main(ActivityThread.java:4424)
05-07 14:34:01.302: E/AndroidRuntime(713):  at java.lang.reflect.Method.invokeNative(Native Method)
05-07 14:34:01.302: E/AndroidRuntime(713):  at java.lang.reflect.Method.invoke(Method.java:511)
05-07 14:34:01.302: E/AndroidRuntime(713):  at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
05-07 14:34:01.302: E/AndroidRuntime(713):  at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
05-07 14:34:01.302: E/AndroidRuntime(713):  at dalvik.system.NativeStart.main(Native Method)
05-07 14:34:01.302: E/AndroidRuntime(713): Caused by: java.lang.NullPointerException
05-07 14:34:01.302: E/AndroidRuntime(713):  at my.calc.CalcActivity.onCreate(CalcActivity.java:30)
05-07 14:34:01.302: E/AndroidRuntime(713):  at android.app.Activity.performCreate(Activity.java:4465)
05-07 14:34:01.302: E/AndroidRuntime(713):  at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
05-07 14:34:01.302: E/AndroidRuntime(713):  at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
05-07 14:34:01.302: E/AndroidRuntime(713):  ... 11 more
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1 Answer

  1. Editorial Team
     Caused by: java.lang.NullPointerException

    the above line indicates you have null pointer exception and the below indicated the line number(CalcActivity.java:30).

    05-07 14:34:01.302: E/AndroidRuntime(713):  at my.calc.CalcActivity.onCreate(CalcActivity.java:30)

    and hopefully you may had forget to use setContentView in oncreate() and using xml file components.

    Updated:::

    adapter = new ArrayAdapter<CharSequence>(CalcActivity.this,android.R.layout.simple_spinner_dropdown_item, your_array_list_of_charsequence);

    try by adding above line before adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);

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