en faisant un petit programme qui permet de stocker dans une BDD j'ai eu ces erreurs:
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04-20 22:06:19.521: ERROR/AndroidRuntime(1092): FATAL EXCEPTION: main
04-20 22:06:19.521: ERROR/AndroidRuntime(1092): java.lang.RuntimeException: Unable to instantiate activity ComponentInfo{com.sncft.agentsncft/com.sncft.agentsncft.Acceuil}: java.lang.NullPointerException
04-20 22:06:19.521: ERROR/AndroidRuntime(1092):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2585)
04-20 22:06:19.521: ERROR/AndroidRuntime(1092):     at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2679)
04-20 22:06:19.521: ERROR/AndroidRuntime(1092):     at android.app.ActivityThread.access$2300(ActivityThread.java:125)
04-20 22:06:19.521: ERROR/AndroidRuntime(1092):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2033)
04-20 22:06:19.521: ERROR/AndroidRuntime(1092):     at android.os.Handler.dispatchMessage(Handler.java:99)
04-20 22:06:19.521: ERROR/AndroidRuntime(1092):     at android.os.Looper.loop(Looper.java:123)
04-20 22:06:19.521: ERROR/AndroidRuntime(1092):     at android.app.ActivityThread.main(ActivityThread.java:4627)
04-20 22:06:19.521: ERROR/AndroidRuntime(1092):     at java.lang.reflect.Method.invokeNative(Native Method)
04-20 22:06:19.521: ERROR/AndroidRuntime(1092):     at java.lang.reflect.Method.invoke(Method.java:521)
04-20 22:06:19.521: ERROR/AndroidRuntime(1092):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:868)
04-20 22:06:19.521: ERROR/AndroidRuntime(1092):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626)
04-20 22:06:19.521: ERROR/AndroidRuntime(1092):     at dalvik.system.NativeStart.main(Native Method)
04-20 22:06:19.521: ERROR/AndroidRuntime(1092): Caused by: java.lang.NullPointerException
04-20 22:06:19.521: ERROR/AndroidRuntime(1092):     at com.sncft.agentsncft.Acceuil.<init>(Acceuil.java:102)
04-20 22:06:19.521: ERROR/AndroidRuntime(1092):     at java.lang.Class.newInstanceImpl(Native Method)
04-20 22:06:19.521: ERROR/AndroidRuntime(1092):     at java.lang.Class.newInstance(Class.java:1429)
04-20 22:06:19.521: ERROR/AndroidRuntime(1092):     at android.app.Instrumentation.newActivity(Instrumentation.java:1021)
04-20 22:06:19.521: ERROR/AndroidRuntime(1092):     at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2577)
04-20 22:06:19.521: ERROR/AndroidRuntime(1092):     ... 11 more