Question

I create this table:

"create table "  + DATABASE_TABLE + " ("
    + KEY_ROWID + " integer primary key autoincrement not null, "
    + KEY_TITLE + " text not null, "
    + KEY_BODY + " text not null, " + KEY_DATE_TIME + " text not null);"

and here is what I do for inserting:

ContentValues initialValues = new ContentValues();
initialValues.put("title", title);
initialValues.put("body", body);
initialValues.put("abc", anc);
return mDb.insert(DATABASE_TABLE, null, initialValues); 

but due to some error my app force closes. Help me out please…

Logcat errors:

java.lang.NullPointerException
com.maddy.task_reminder.ReminderDbAdapter.createReminder(ReminderDbAdapter.java:133)
06-09 23:28:44.112: E/AndroidRuntime(412):  at com.maddy.task_reminder.edit_activity$4.onClick(edit_activity.java:143)

Answer 1

If you are following the generic DBAdapter examples on the web, check that you call:

mDbHelper.open();

in your Activity. Otherwise mDb is never instantiated in your database helper class, it is always null.

Addition from Comment:

So this is your open() method.

public ReminderDbAdapter open() throws SQLException { 
    mDbHelper = new DatabaseHelper(mCtx); 
    mDb = mDbHelper.getWritableDatabase(); 
    return this; 
}

If your ReminderDbAdapter constructor doesn’t look like this:

public ReminderDbAdapter(Context context) {
    ...
    mCtx = context;
    open(); // Do you have this line?
}

Then you need to explicitly call ReminderDbAdapter.open() in your activity, possibly like this:

ReminderDbAdapter mDbHelper = new ReminderDbAdapter(this); 
mDbHelper.open();