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Android Build a Simple Android App (retired 2014) Getting Started with Android Adding an OnClickListener to a Button

CrystalBall stopped working

So I saw there was like 100 threads on this but I havent managed to find an answer to this issue somehow. At first I was getting an error trying to add the 'final' tag after you do the quickfix which i got to work but now when I run the app it just crashes. Here is what my LogCat says (i see the fatal exception there but cant pinpoint what is causing that or why its happening:

07-11 22:14:07.269: D/AndroidRuntime(1132): Shutting down VM 07-11 22:14:07.269: W/dalvikvm(1132): threadid=1: thread exiting with uncaught exception (group=0xb1adcba8) 07-11 22:14:07.309: E/AndroidRuntime(1132): FATAL EXCEPTION: main 07-11 22:14:07.309: E/AndroidRuntime(1132): Process: matt.crystalball, PID: 1132 07-11 22:14:07.309: E/AndroidRuntime(1132): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{matt.crystalball/matt.crystalball.MainActivity}: java.lang.NullPointerException 07-11 22:14:07.309: E/AndroidRuntime(1132): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2121) 07-11 22:14:07.309: E/AndroidRuntime(1132): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245) 07-11 22:14:07.309: E/AndroidRuntime(1132): at android.app.ActivityThread.access$800(ActivityThread.java:135) 07-11 22:14:07.309: E/AndroidRuntime(1132): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196) 07-11 22:14:07.309: E/AndroidRuntime(1132): at android.os.Handler.dispatchMessage(Handler.java:102) 07-11 22:14:07.309: E/AndroidRuntime(1132): at android.os.Looper.loop(Looper.java:136) 07-11 22:14:07.309: E/AndroidRuntime(1132): at android.app.ActivityThread.main(ActivityThread.java:5017) 07-11 22:14:07.309: E/AndroidRuntime(1132): at java.lang.reflect.Method.invokeNative(Native Method) 07-11 22:14:07.309: E/AndroidRuntime(1132): at java.lang.reflect.Method.invoke(Method.java:515) 07-11 22:14:07.309: E/AndroidRuntime(1132): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779) 07-11 22:14:07.309: E/AndroidRuntime(1132): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595) 07-11 22:14:07.309: E/AndroidRuntime(1132): at dalvik.system.NativeStart.main(Native Method) 07-11 22:14:07.309: E/AndroidRuntime(1132): Caused by: java.lang.NullPointerException 07-11 22:14:07.309: E/AndroidRuntime(1132): at android.app.Activity.findViewById(Activity.java:1884) 07-11 22:14:07.309: E/AndroidRuntime(1132): at matt.crystalball.MainActivity.<init>(MainActivity.java:22) 07-11 22:14:07.309: E/AndroidRuntime(1132): at java.lang.Class.newInstanceImpl(Native Method) 07-11 22:14:07.309: E/AndroidRuntime(1132): at java.lang.Class.newInstance(Class.java:1208) 07-11 22:14:07.309: E/AndroidRuntime(1132): at android.app.Instrumentation.newActivity(Instrumentation.java:1061) 07-11 22:14:07.309: E/AndroidRuntime(1132): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2112) 07-11 22:14:07.309: E/AndroidRuntime(1132): ... 11 more 07-11 22:14:11.609: I/Process(1132): Sending signal. PID: 1132 SIG: 9

Anything helps, thanks!

1 Answer

Dominik Schubert
Dominik Schubert
1,724 Points

Please show your code. Whats on your line 22? Did you compare your code with the example code?

Sorry I forgot to mention I figured it out, i just restarted most of the project and it worked out fine, I must have missed something small along the way! thanks for responding