How to Create database for objects in Android

Question

In my app I have 3 edit text and a save button, I want to store these values on a button click using db4o.But it is showing a null pointer exception.

Logcat Details:

11-12 14:29:32.566: W/KeyCharacterMap(12122): No keyboard for id 0
11-12 14:29:32.594: W/KeyCharacterMap(12122): Using default keymap: /system/usr/keychars/qwerty.kcm.bin
11-12 14:29:41.694: D/AndroidRuntime(12122): Shutting down VM
11-12 14:29:41.694: W/dalvikvm(12122): threadid=1: thread exiting with uncaught exception (group=0x40015560)
11-12 14:29:41.863: E/AndroidRuntime(12122): FATAL EXCEPTION: main
11-12 14:29:41.863: E/AndroidRuntime(12122): java.lang.NullPointerException
11-12 14:29:41.863: E/AndroidRuntime(12122):    at java.io.File.fixSlashes(File.java:205)
11-12 14:29:41.863: E/AndroidRuntime(12122):    at java.io.File.init(File.java:189)
11-12 14:29:41.863: E/AndroidRuntime(12122):    at java.io.File.<init>(File.java:139)
11-12 14:29:41.863: E/AndroidRuntime(12122):    at com.db4o.io.FileStorage.exists(FileStorage.java:29)
11-12 14:29:41.863: E/AndroidRuntime(12122):    at com.db4o.io.StorageDecorator.exists(StorageDecorator.java:23)
11-12 14:29:41.863: E/AndroidRuntime(12122):    at com.db4o.internal.IoAdaptedObjectContainer.openImpl(IoAdaptedObjectContainer.java:42)
11-12 14:29:41.863: E/AndroidRuntime(12122):    at com.db4o.internal.ObjectContainerBase$1.run(ObjectContainerBase.java:140)
11-12 14:29:41.863: E/AndroidRuntime(12122):    at com.db4o.foundation.DynamicVariable.with(DynamicVariable.java:54)
11-12 14:29:41.863: E/AndroidRuntime(12122):    at com.db4o.foundation.Environments.runWith(Environments.java:28)
11-12 14:29:41.863: E/AndroidRuntime(12122):    at com.db4o.internal.ObjectContainerBase.withEnvironment(ObjectContainerBase.java:161)
11-12 14:29:41.863: E/AndroidRuntime(12122):    at com.db4o.internal.ObjectContainerBase.open(ObjectContainerBase.java:131)
11-12 14:29:41.863: E/AndroidRuntime(12122):    at com.db4o.internal.IoAdaptedObjectContainer.<init>(IoAdaptedObjectContainer.java:35)
11-12 14:29:41.863: E/AndroidRuntime(12122):    at com.db4o.internal.ObjectContainerFactory.openObjectContainer(ObjectContainerFactory.java:18)
11-12 14:29:41.863: E/AndroidRuntime(12122):    at com.db4o.Db4oEmbedded.openFile(Db4oEmbedded.java:65)
11-12 14:29:41.863: E/AndroidRuntime(12122):    at com.example.db4object.Db4ObjectsHelper.OpenDb(Db4ObjectsHelper.java:23)
11-12 14:29:41.863: E/AndroidRuntime(12122):    at com.example.db4object.MainActivity$1.onClick(MainActivity.java:33)
11-12 14:29:41.863: E/AndroidRuntime(12122):    at android.view.View.performClick(View.java:2485)
11-12 14:29:41.863: E/AndroidRuntime(12122):    at android.view.View$PerformClick.run(View.java:9080)
11-12 14:29:41.863: E/AndroidRuntime(12122):    at android.os.Handler.handleCallback(Handler.java:587)
11-12 14:29:41.863: E/AndroidRuntime(12122):    at android.os.Handler.dispatchMessage(Handler.java:92)
11-12 14:29:41.863: E/AndroidRuntime(12122):    at android.os.Looper.loop(Looper.java:123)
11-12 14:29:41.863: E/AndroidRuntime(12122):    at android.app.ActivityThread.main(ActivityThread.java:3683)
11-12 14:29:41.863: E/AndroidRuntime(12122):    at java.lang.reflect.Method.invokeNative(Native Method)
11-12 14:29:41.863: E/AndroidRuntime(12122):    at java.lang.reflect.Method.invoke(Method.java:507)
11-12 14:29:41.863: E/AndroidRuntime(12122):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
11-12 14:29:41.863: E/AndroidRuntime(12122):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
11-12 14:29:41.863: E/AndroidRuntime(12122):    at dalvik.system.NativeStart.main(Native Method)
11-12 14:29:41.963: D/dalvikvm(12122): GC_CONCURRENT freed 310K, 52% free 2733K/5639K, external 410K/517K, paused 13ms+9ms
11-12 14:34:42.160: I/Process(12122): Sending signal. PID: 12122 SIG: 9

Please help.

yes sure...i have edited my question. You can check over there... — Pihu
– Pihu, Commented Nov 12, 2013 at 9:17
11-12 14:29:41.863: E/AndroidRuntime(12122): at com.db4o.Db4oEmbedded.openFile(Db4oEmbedded.java:65) 11-12 14:29:41.863: E/AndroidRuntime(12122): at com.example.db4object.Db4ObjectsHelper.OpenDb(Db4ObjectsHelper.java:23) 11-12 14:29:41.863: E/AndroidRuntime(12122): at com.example.db4object.MainActivity$1.onClick(MainActivity.java:33) please post the code in above error lines — krishna
– krishna, Commented Nov 12, 2013 at 9:25
private void onClickListener() { mbtnSave.setOnClickListener(new OnClickListener() { @Override public void onClick(View v) { getEditTextValue(); dbHelper.OpenDb(); dbHelper.StoreContact(person); dbHelper.getAllContacts(); dbHelper.CloseDb(); } — Pihu
– Pihu, Commented Nov 12, 2013 at 10:27

tasomaniac · Accepted Answer · 2013-11-12 09:34:09Z

1

Database creation is a pain in Android. Its better to use ContentProvider API and it is even harder.

The below library is very simple and you can make use of ContentProvider as well. (For inserting and querying the database)

https://github.com/TimotheeJeannin/ProviGen

answered Nov 12, 2013 at 9:34

tasomaniac

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krishna · Accepted Answer · 2013-11-12 09:08:41Z

0

Go through the examples here and here

This will be helpfull for you in creating db4o databse in android

answered Nov 12, 2013 at 9:08

krishna

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1 Comment

Pihu Over a year ago

How to checkthe output?I mean how to check if the tables have been created or not?My SqlLite Database browser 2.0 is not supporting db4o

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