I also thought about missing permission but I can not find a suitable
one. Could it be a problem of the filesystem at the end the database
is nothing more than a file. Do I need to create it beforehands?
Please, any help would be great.
On 21 Sep., 20:31, Peter <peter.osb...@gmail.com> wrote:
> Hi list,
>
> I am trying to develop an application which shall use an
> SQLiteDatabase to store some objects. I went through several tutorials
> and also took a look at the notepad example code in the android code
> section. I always get one and a same exception of which I can't figure
> out why it happens.
>
> I extended the SQLiteOpenHelper class and in my Activity I try to call
> the getReadableDatabase() method. When I take a look at the StackTrace
> of the exception, I can see that it is thrown in
> ContextWrapper.openOrCreateDatabase().
>
> 09-21 18:07:44.103: ERROR/Homepage Ping(339): null
> 09-21 18:07:44.103: ERROR/Homepage Ping(339):
> java.lang.NullPointerException
> 09-21 18:07:44.103: ERROR/Homepage Ping(339): at
> android.content.ContextWrapper.openOrCreateDatabase(ContextWrapper.java:
> 193)
> 09-21 18:07:44.103: ERROR/Homepage Ping(339): at
> android.database.sqlite.SQLiteOpenHelper.getWritableDatabase(SQLiteOpenHelp
> er.java:
> 98)
> 09-21 18:07:44.103: ERROR/Homepage Ping(339): at
> android.database.sqlite.SQLiteOpenHelper.getReadableDatabase(SQLiteOpenHelp
> er.java:
> 158)
> 09-21 18:07:44.103: ERROR/Homepage Ping(339): at
> de.peterosburg.android.homepagePing.HomepagePing.initializeWebsites(Homepag
> ePing.java:
> 72)
> 09-21 18:07:44.103: ERROR/Homepage Ping(339): at
> de.peterosburg.android.homepagePing.HomepagePing.<init>(HomepagePing.java:
> 38)
> 09-21 18:07:44.103: ERROR/Homepage Ping(339): at
> java.lang.Class.newInstanceImpl(Native Method)
> 09-21 18:07:44.103: ERROR/Homepage Ping(339): at
> java.lang.Class.newInstance(Class.java:1479)
> 09-21 18:07:44.103: ERROR/Homepage Ping(339): at
> android.app.Instrumentation.newActivity(Instrumentation.java:1021)
> 09-21 18:07:44.103: ERROR/Homepage Ping(339): at
> android.app.ActivityThread.performLaunchActivity(ActivityThread.java:
> 2409)
> 09-21 18:07:44.103: ERROR/Homepage Ping(339): at
> android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:
> 2512)
>
> The code of my class looks as follows:
>
> public class WebsiteData extends SQLiteOpenHelper {
>
> private static final String DATABASE_NAME = SITES_DATABASE_NAME;
> private static final int DATABASE_VERSION = 1;
>
> private static String[] FROM = { _ID, SITE_IDENTIFIER, SITE_URL, };
> private static String ORDER_BY = _ID + " ASC";
>
> public WebsiteData(Context cntxt){
> super(cntxt, DATABASE_NAME, null, DATABASE_VERSION);
> }
>
> @Override
> public void onCreate(SQLiteDatabase db) {
> Log.w(HomepagePing.tag, "Creating Websites db");
>
> db.execSQL("CREATE TABLE "+ SITES_TABLE_NAME +" ("
> + _ID + " INTEGER PRIMARY KEY AUTOINCREMENT, "
> + SITE_IDENTIFIER + " TEXT NOT NULL "
> + SITE_URL + " TEXT NOT NULL"
> + ");");
> }
>
> @Override
> public void onUpgrade(SQLiteDatabase db, int oldVersion, int
> newVersion) {
> db.execSQL("DROP TABLE IF EXISTS " + SITES_TABLE_NAME);
> onCreate(db);
> }
>
> }
>
> Within my activity I do the following:
>
> try{
> //this.sites_db =
> this.openOrCreateDatabase(SITES_DATABASE_NAME, MODE_PRIVATE, null);
> WebsiteData data = new WebsiteData(this);
> SQLiteDatabase db = data.getReadableDatabase();
>
> } catch(Exception e){
> Log.e(HomepagePing.tag, e.getMessage(), e);
> }
>
> As you can see the Exception is written to the log at exactly this try-
> catch-block. I squeezed the hell out of Google but couln't find any
> solution yet.
>
> Any help is highly appreciated.
> I am using an Emulator with API Level 7 (Android2.1-update1)
>
> If you need any more information, let me know and I try to share it.
>
> Regards,
> Peter
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