Cursor test=db.rawQuery("select * from message",null);
            test.moveToFirst();
            String[] messages=new String[test.getCount()];
            if(test.getCount()>0) {
                do {
                    if(test.getString(2).equals(mob))
                        Toast.makeText(getApplicationContext(), "Youn" + test.getString(1), Toast.LENGTH_LONG).show();
                    else
                        Toast.makeText(getApplicationContext(), test.getString(2)+"n" + test.getString(1), Toast.LENGTH_LONG).show();
                } while (test.moveToNext());
            }
            data.putStringArray("messages", messages);
            data.putString("number", mob);

java.lang.RuntimeException: Unable to start activity ComponentInfo{alaman.dailybook/alaman.dailybook.LogMain}: java.lang.NullPointerException