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Android Build a Simple Android App (retired 2014) Pretty Little Things Customizing Buttons and Labels

Posted by Ali Shaltout
Ali Shaltout
994 Points

my app not working

every time i run my app it's give me popup window with this message " sorry : the application crystal ball (process com.ali.crystalball) has stopped unexpectedly. please try again "

what can i do now ?

2 Answers

Erin Kabbash
Erin Kabbash
5,210 Points
Erin Kabbash
Erin Kabbash
5,210 Points

On the bottom of Eclipse you will see a tab called "LogCat". Can you copy and past the red messages from there? LogCat should highlight what is causing the app to crash.

Ali Shaltout
Ali Shaltout
994 Points
Ali Shaltout
Ali Shaltout
994 Points

06-27 22:48:28.967: W/dalvikvm(1300): threadid=1: thread exiting with uncaught exception (group=0xb5f414f0) 06-27 22:48:28.976: E/AndroidRuntime(1300): FATAL EXCEPTION: main 06-27 22:48:28.976: E/AndroidRuntime(1300): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.ali.crystalball/com.ali.crystalball.MainActivity}: java.lang.ClassCastException: android.widget.TextView 06-27 22:48:28.976: E/AndroidRuntime(1300): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1647) 06-27 22:48:28.976: E/AndroidRuntime(1300): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1663) 06-27 22:48:28.976: E/AndroidRuntime(1300): at android.app.ActivityThread.access$1500(ActivityThread.java:117) 06-27 22:48:28.976: E/AndroidRuntime(1300): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:931) 06-27 22:48:28.976: E/AndroidRuntime(1300): at android.os.Handler.dispatchMessage(Handler.java:99) 06-27 22:48:28.976: E/AndroidRuntime(1300): at android.os.Looper.loop(Looper.java:130) 06-27 22:48:28.976: E/AndroidRuntime(1300): at android.app.ActivityThread.main(ActivityThread.java:3683) 06-27 22:48:28.976: E/AndroidRuntime(1300): at java.lang.reflect.Method.invokeNative(Native Method) 06-27 22:48:28.976: E/AndroidRuntime(1300): at java.lang.reflect.Method.invoke(Method.java:507) 06-27 22:48:28.976: E/AndroidRuntime(1300): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839) 06-27 22:48:28.976: E/AndroidRuntime(1300): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597) 06-27 22:48:28.976: E/AndroidRuntime(1300): at dalvik.system.NativeStart.main(Native Method) 06-27 22:48:28.976: E/AndroidRuntime(1300): Caused by: java.lang.ClassCastException: android.widget.TextView 06-27 22:48:28.976: E/AndroidRuntime(1300): at com.ali.crystalball.MainActivity.onCreate(MainActivity.java:30) 06-27 22:48:28.976: E/AndroidRuntime(1300): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047) 06-27 22:48:28.976: E/AndroidRuntime(1300): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1611) 06-27 22:48:28.976: E/AndroidRuntime(1300): ... 11 more

this's LogCat red messages

how can i understand it ?