Question

I have an android programm which manage a database. It this database, I write the sensor values of my device.

When close the application with the home button, i have a force close error.

Here is my logcat, can you please help me, thank you.

`12-27 10:45:20.827: D/AndroidRuntime(1053): Shutting down VM  
12-27 10:45:20.827: W/dalvikvm(1053): threadid=1: thread exiting with uncaught exception (group=0x40014760)  
12-27 10:45:20.942: E/AndroidRuntime(1053): FATAL EXCEPTION: main  
12-27 10:45:20.942: E/AndroidRuntime(1053): java.lang.NullPointerException  
12-27 10:45:20.942: E/AndroidRuntime(1053):     at android.database.sqlite.SQLiteStatement.releaseAndUnlock(SQLiteStatement.java:283)  
12-27 10:45:20.942: E/AndroidRuntime(1053):     at android.database.sqlite.SQLiteStatement.executeInsert(SQLiteStatement.java:116)  
12-27 10:45:20.942: E/AndroidRuntime(1053):     at android.database.sqlite.SQLiteDatabase.insertWithOnConflict(SQLiteDatabase.java:1732)  
12-27 10:45:20.942: E/AndroidRuntime(1053):     at android.database.sqlite.SQLiteDatabase.insert(SQLiteDatabase.java:1605)  
12-27 10:45:20.942: E/AndroidRuntime(1053):     at milos.stationdemesure.CapteursBDD.insertValeursCapteur(CapteursBDD.java:69)  
12-27 10:45:20.942: E/AndroidRuntime(1053):     at milos.stationdemesure.EssaisCapteurs.onProximityChanged(EssaisCapteurs.java:454)  
12-27 10:45:20.942: E/AndroidRuntime(1053):     at milos.stationdemesure.EssaisCapteurs.onSensorChanged(EssaisCapteurs.java:354)  
12-27 10:45:20.942: E/AndroidRuntime(1053):     at android.hardware.SensorManager$ListenerDelegate$1.handleMessage(SensorManager.java:529)  
12-27 10:45:20.942: E/AndroidRuntime(1053):     at android.os.Handler.dispatchMessage(Handler.java:99)
12-27 10:45:20.942: E/AndroidRuntime(1053):     at android.os.Looper.loop(Looper.java:126)  
12-27 10:45:20.942: E/AndroidRuntime(1053):     at android.app.ActivityThread.main(ActivityThread.java:3997)  
12-27 10:45:20.942: E/AndroidRuntime(1053):     at java.lang.reflect.Method.invokeNative(Native Method)  
12-27 10:45:20.942: E/AndroidRuntime(1053):     at java.lang.reflect.Method.invoke(Method.java:491)
12-27 10:45:20.942: E/AndroidRuntime(1053):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:841)  
12-27 10:45:20.942: E/AndroidRuntime(1053):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:599)  
12-27 10:45:20.942: E/AndroidRuntime(1053):     at dalvik.system.NativeStart.main(Native Method)
`

Answer 1

I feel the issue is either database instance or any other object became null but you are calling some method using that object. Always check for null before using any methods of any object. see the sample example

example

if(database != null){
database.close();
}