CODEWITHSUNDEEP
androidsqlite
flitjes
flitjes

Reputation: 125

Create Sqlitedb from Android.App.Application

I've got a Android.App.Application which tries to create a DB. I'm using the SQLite db example code. It works great if I use it inside an Activity. When I try to create the exact same thing inside my Android.App.Application it crashes. I've got no clue why.

When I'm calling this from an activity:

public class Manager extends Activity{  
@Override
protected void onCreate(Bundle savedInstanceState) {        
    fbdbhelper = new FishingBuddyOpenHelper(getApplicationContext());   
    db = fbdbhelper.getTbfw().getReadableDatabase();
    }

A sqlite db is created (/data/data/com.fishingbuddy/databases/)

When done from an Android.App.Application it fails:

public class FishingManager extends Application{    
public FishingManager() {       
    fbdbhelper = new FishingBuddyOpenHelper(getApplicationContext());   
    db = fbdbhelper.getTbfw().getReadableDatabase();
    }

09-22 21:19:18.386: E/AndroidRuntime(21881): FATAL EXCEPTION: main 09-22 21:19:18.386: E/AndroidRuntime(21881): java.lang.RuntimeException: Unable to >instantiate application com.fishingbuddy.logic.FishingManager: java.lang.NullPointerException 09-22 21:19:18.386: E/AndroidRuntime(21881): at android.app.LoadedApk.makeApplication(LoadedApk.java:504) 09-22 21:19:18.386: E/AndroidRuntime(21881): at android.app.ActivityThread.handleBindApplication(ActivityThread.java:4550) 09-22 21:19:18.386: E/AndroidRuntime(21881): at android.app.ActivityThread.access$1300(ActivityThread.java:153) 09-22 21:19:18.386: E/AndroidRuntime(21881): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1307) 09-22 21:19:18.386: E/AndroidRuntime(21881): at android.os.Handler.dispatchMessage(Handler.java:99) 09-22 21:19:18.386: E/AndroidRuntime(21881): at android.os.Looper.loop(Looper.java:137) 09-22 21:19:18.386: E/AndroidRuntime(21881): at android.app.ActivityThread.main(ActivityThread.java:5227) 09-22 21:19:18.386: E/AndroidRuntime(21881): at java.lang.reflect.Method.invokeNative(Native Method) 09-22 21:19:18.386: E/AndroidRuntime(21881): at java.lang.reflect.Method.invoke(Method.java:511) 09-22 21:19:18.386: E/AndroidRuntime(21881): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:795) 09-22 21:19:18.386: E/AndroidRuntime(21881): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:562) 09-22 21:19:18.386: E/AndroidRuntime(21881): at dalvik.system.NativeStart.main(Native Method) 09-22 21:19:18.386: E/AndroidRuntime(21881): Caused by: java.lang.NullPointerException 09-22 21:19:18.386: E/AndroidRuntime(21881): at android.content.ContextWrapper.getApplicationContext(ContextWrapper.java:109) 09-22 21:19:18.386: E/AndroidRuntime(21881): at com.fishingbuddy.logic.FishingManager.(FishingManager.java:26) 09-22 21:19:18.386: E/AndroidRuntime(21881): at java.lang.Class.newInstanceImpl(Native Method) 09-22 21:19:18.386: E/AndroidRuntime(21881): at java.lang.Class.newInstance(Class.java:1319) 09-22 21:19:18.386: E/AndroidRuntime(21881): at android.app.Instrumentation.newApplication(Instrumentation.java:983) 09-22 21:19:18.386: E/AndroidRuntime(21881): at android.app.Instrumentation.newApplication(Instrumentation.java:968) 09-22 21:19:18.386: E/AndroidRuntime(21881): at android.app.LoadedApk.makeApplication(LoadedApk.java:499) 09-22 21:19:18.386: E/AndroidRuntime(21881): ... 11 more

I'm using a Application because I'm using the singleton pattern for my FishingManager. It all worked great until I started the final part, saving all my data to an SQLite db.

Thanks in advance

Upvotes: 1

Views: 98

Answers (2)

adarsh
adarsh

Reputation: 6978

You probably need to declare a content provider in the manifest file like given in this example

Upvotes: 0

CommonsWare
CommonsWare

Reputation: 1006819

When I'm calling this from an activity:

It will crash with a SuperNotCalledException.

When done from an Android.App.Application it fails

Even if you deleted the two lines of code here, it will crash, with a SuperNotCalledException.

Please call super.onCreate() in onCreate() of an Activity (or Application) before doing much of anything else.

I'm using a Application because I'm using the singleton pattern for my FishingManager.

You do not need an Application subclass to have a singleton SQLiteOpenHelper. You just need a singleton SQLiteOpenHelper that you lazy-initialize on first use.

Upvotes: 1

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