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Ramya reddy
Courses Plus Student 1,746 PointsI have no errors in my code but still crystalball app crashes in the emulator. Please help
folks, i was following instructions and have no errors in my code. But when i run the crystalball app it crashes. Please see below for logcat. Also can you teach me on how to read the error messages? Thank you!
07-16 00:43:25.475: D/dalvikvm(1054): GC_FOR_ALLOC freed 70K, 5% free 2812K/2960K, paused 105ms, total 105ms 07-16 00:43:25.475: I/dalvikvm-heap(1054): Grow heap (frag case) to 3.254MB for 457216-byte allocation 07-16 00:43:25.525: D/dalvikvm(1054): GC_FOR_ALLOC freed <1K, 5% free 3258K/3408K, paused 30ms, total 30ms 07-16 00:43:25.555: D/AndroidRuntime(1054): Shutting down VM 07-16 00:43:25.555: W/dalvikvm(1054): threadid=1: thread exiting with uncaught exception (group=0xb3ae3ba8) 07-16 00:43:25.565: E/AndroidRuntime(1054): FATAL EXCEPTION: main 07-16 00:43:25.565: E/AndroidRuntime(1054): Process: com.example.crystalball, PID: 1054 07-16 00:43:25.565: E/AndroidRuntime(1054): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.crystalball/com.example.crystalball.MainActivity}: java.lang.ClassCastException: android.widget.TextView cannot be cast to android.widget.Button 07-16 00:43:25.565: E/AndroidRuntime(1054): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195) 07-16 00:43:25.565: E/AndroidRuntime(1054): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245) 07-16 00:43:25.565: E/AndroidRuntime(1054): at android.app.ActivityThread.access$800(ActivityThread.java:135) 07-16 00:43:25.565: E/AndroidRuntime(1054): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196) 07-16 00:43:25.565: E/AndroidRuntime(1054): at android.os.Handler.dispatchMessage(Handler.java:102) 07-16 00:43:25.565: E/AndroidRuntime(1054): at android.os.Looper.loop(Looper.java:136) 07-16 00:43:25.565: E/AndroidRuntime(1054): at android.app.ActivityThread.main(ActivityThread.java:5017) 07-16 00:43:25.565: E/AndroidRuntime(1054): at java.lang.reflect.Method.invokeNative(Native Method) 07-16 00:43:25.565: E/AndroidRuntime(1054): at java.lang.reflect.Method.invoke(Method.java:515) 07-16 00:43:25.565: E/AndroidRuntime(1054): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779) 07-16 00:43:25.565: E/AndroidRuntime(1054): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595) 07-16 00:43:25.565: E/AndroidRuntime(1054): at dalvik.system.NativeStart.main(Native Method) 07-16 00:43:25.565: E/AndroidRuntime(1054): Caused by: java.lang.ClassCastException: android.widget.TextView cannot be cast to android.widget.Button 07-16 00:43:25.565: E/AndroidRuntime(1054): at com.example.crystalball.MainActivity.onCreate(MainActivity.java:23) 07-16 00:43:25.565: E/AndroidRuntime(1054): at android.app.Activity.performCreate(Activity.java:5231) 07-16 00:43:25.565: E/AndroidRuntime(1054): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087) 07-16 00:43:25.565: E/AndroidRuntime(1054): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159) 07-16 00:43:25.565: E/AndroidRuntime(1054): ... 11 more 07-16 00:43:32.255: I/Process(1054): Sending signal. PID: 1054 SIG: 9
1 Answer
Daniel Hartin
18,106 PointsFirstly I'm not all that good at reading these error messages myself so can't help there much it seems a bit of a wading through the crap game to me as well at the minute.
From the message posted above though on line 10 is does say:
java.lang.ClassCastException: android.widget.TextView cannot be cast to android.widget.Button
so your code has thrown a ClassCastException. You have probably accidentally defined a TextView as a Button go back to your XML file and make sure all your id's match up with the correct cast in your Java code, this doesn't get highlighted as a syntax error as your code is probably correct (syntax) only it's defining the wrong view that's all.
Ramya reddy
Courses Plus Student 1,746 PointsRamya reddy
Courses Plus Student 1,746 PointsI looked through the code and haven't defined a TextView as a Button anywhere
Thanks for the help. Lets see if anyone has insight into this.