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Asked: 2026-06-08T22:24:16+00:00

Here is the logcat. Please help 04-30 11:52:45.716: E/AndroidRuntime(1430): FATAL EXCEPTION: main 04-30 11:52:45.716:

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Here is the logcat. Please help

04-30 11:52:45.716: E/AndroidRuntime(1430): FATAL EXCEPTION: main
04-30 11:52:45.716: E/AndroidRuntime(1430): java.lang.RuntimeException: Unable to start activity ComponentInfo{my.calc/my.calc.CalcActivity}: java.lang.NullPointerException
04-30 11:52:45.716: E/AndroidRuntime(1430):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)
04-30 11:52:45.716: E/AndroidRuntime(1430):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
04-30 11:52:45.716: E/AndroidRuntime(1430):     at android.app.ActivityThread.access$600(ActivityThread.java:123)
04-30 11:52:45.716: E/AndroidRuntime(1430):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
04-30 11:52:45.716: E/AndroidRuntime(1430):     at android.os.Handler.dispatchMessage(Handler.java:99)
04-30 11:52:45.716: E/AndroidRuntime(1430):     at android.os.Looper.loop(Looper.java:137)
04-30 11:52:45.716: E/AndroidRuntime(1430):     at android.app.ActivityThread.main(ActivityThread.java:4424)
04-30 11:52:45.716: E/AndroidRuntime(1430):     at java.lang.reflect.Method.invokeNative(Native Method)
04-30 11:52:45.716: E/AndroidRuntime(1430):     at java.lang.reflect.Method.invoke(Method.java:511)
04-30 11:52:45.716: E/AndroidRuntime(1430):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
04-30 11:52:45.716: E/AndroidRuntime(1430):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
04-30 11:52:45.716: E/AndroidRuntime(1430):     at dalvik.system.NativeStart.main(Native Method)
04-30 11:52:45.716: E/AndroidRuntime(1430): Caused by: java.lang.NullPointerException
04-30 11:52:45.716: E/AndroidRuntime(1430):     at my.calc.CalcActivity.onCreate(CalcActivity.java:47)
04-30 11:52:45.716: E/AndroidRuntime(1430):     at android.app.Activity.performCreate(Activity.java:4465)
04-30 11:52:45.716: E/AndroidRuntime(1430):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
04-30 11:52:45.716: E/AndroidRuntime(1430):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
04-30 11:52:45.716: E/AndroidRuntime(1430):     ... 11 more
04-30 11:53:59.415: E/AndroidRuntime(1445): FATAL EXCEPTION: main
04-30 11:53:59.415: E/AndroidRuntime(1445): java.lang.RuntimeException: Unable to start activity ComponentInfo{my.calc/my.calc.CalcActivity}: java.lang.NullPointerException
04-30 11:53:59.415: E/AndroidRuntime(1445):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)
04-30 11:53:59.415: E/AndroidRuntime(1445):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
04-30 11:53:59.415: E/AndroidRuntime(1445):     at android.app.ActivityThread.access$600(ActivityThread.java:123)
04-30 11:53:59.415: E/AndroidRuntime(1445):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
04-30 11:53:59.415: E/AndroidRuntime(1445):     at android.os.Handler.dispatchMessage(Handler.java:99)
04-30 11:53:59.415: E/AndroidRuntime(1445):     at android.os.Looper.loop(Looper.java:137)
04-30 11:53:59.415: E/AndroidRuntime(1445):     at android.app.ActivityThread.main(ActivityThread.java:4424)
04-30 11:53:59.415: E/AndroidRuntime(1445):     at java.lang.reflect.Method.invokeNative(Native Method)
04-30 11:53:59.415: E/AndroidRuntime(1445):     at java.lang.reflect.Method.invoke(Method.java:511)
04-30 11:53:59.415: E/AndroidRuntime(1445):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
04-30 11:53:59.415: E/AndroidRuntime(1445):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
04-30 11:53:59.415: E/AndroidRuntime(1445):     at dalvik.system.NativeStart.main(Native Method)
04-30 11:53:59.415: E/AndroidRuntime(1445): Caused by: java.lang.NullPointerException
04-30 11:53:59.415: E/AndroidRuntime(1445):     at my.calc.CalcActivity.onCreate(CalcActivity.java:47)
04-30 11:53:59.415: E/AndroidRuntime(1445):     at android.app.Activity.performCreate(Activity.java:4465)
04-30 11:53:59.415: E/AndroidRuntime(1445):     at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1049)
04-30 11:53:59.415: E/AndroidRuntime(1445):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1920)
04-30 11:53:59.415: E/AndroidRuntime(1445):     ... 11 more
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1 Answer

  1. Editorial Team

    your error message says “NullPointerException” and it seems to have been caused by something inside the onCreate() method of CalcActivity. Go to line 47 of your code for that class, as indicated by:

    04-30 11:53:59.415: E/AndroidRuntime(1445): Caused by: java.lang.NullPointerException
04-30 11:53:59.415: E/AndroidRuntime(1445):     at my.calc.CalcActivity.onCreate(CalcActivity.java:47)

    Make sure that you did not make a call on an object that has not been initialized yet, or that basically has a null value. For example,

    List<String> strings;
strings.get(0); // you should have done something like this one first:
                // strings = new ArrayList<String>();
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