07-05 10:02:17.443: E/AndroidRuntime(28801): FATAL EXCEPTION: main
07-05 10:02:17.443: E/AndroidRuntime(28801): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.database_demo/com.database_demo.Database_demo}: java.lang.NullPointerException
07-05 10:02:17.443: E/AndroidRuntime(28801):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1659)
07-05 10:02:17.443: E/AndroidRuntime(28801):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1675)
07-05 10:02:17.443: E/AndroidRuntime(28801):    at android.app.ActivityThread.access$1500(ActivityThread.java:121)
07-05 10:02:17.443: E/AndroidRuntime(28801):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:943)
07-05 10:02:17.443: E/AndroidRuntime(28801):    at android.os.Handler.dispatchMessage(Handler.java:99)
07-05 10:02:17.443: E/AndroidRuntime(28801):    at android.os.Looper.loop(Looper.java:130)
07-05 10:02:17.443: E/AndroidRuntime(28801):    at android.app.ActivityThread.main(ActivityThread.java:3701)
07-05 10:02:17.443: E/AndroidRuntime(28801):    at java.lang.reflect.Method.invokeNative(Native Method)
07-05 10:02:17.443: E/AndroidRuntime(28801):    at java.lang.reflect.Method.invoke(Method.java:507)
07-05 10:02:17.443: E/AndroidRuntime(28801):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:866)
07-05 10:02:17.443: E/AndroidRuntime(28801):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:624)
07-05 10:02:17.443: E/AndroidRuntime(28801):    at dalvik.system.NativeStart.main(Native Method)
07-05 10:02:17.443: E/AndroidRuntime(28801): Caused by: java.lang.NullPointerException
07-05 10:02:17.443: E/AndroidRuntime(28801):    at org.json.JSONTokener.nextCleanInternal(JSONTokener.java:112)
07-05 10:02:17.443: E/AndroidRuntime(28801):    at org.json.JSONTokener.nextValue(JSONTokener.java:90)
07-05 10:02:17.443: E/AndroidRuntime(28801):    at org.json.JSONArray.<init>(JSONArray.java:87)
07-05 10:02:17.443: E/AndroidRuntime(28801):    at org.json.JSONArray.<init>(JSONArray.java:103)
07-05 10:02:17.443: E/AndroidRuntime(28801):    at com.database_demo.Database_demo.onCreate(Database_demo.java:78)
07-05 10:02:17.443: E/AndroidRuntime(28801):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1047)
07-05 10:02:17.443: E/AndroidRuntime(28801):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1623)
07-05 10:02:17.443: E/AndroidRuntime(28801):    ... 11 more