java.lang.IllegalArgumentException: column '_id' does not exist

When I write a ContentProvider that querying the Sqlite. I using the simple code as bellow. I get this weird the column doesn't not exist error.  what make me confusing that the DBHelper has been worked well for a time.

@Override     public Cursor query(Uri url, String[] projection, String selection,             String[] selectionArgs, String sort) {         //Load all results         return dbHelpder.getReadableDatabase().query(DBHelper.TABLE_EQ                 , selectionArgs, null, null, null, null, sort);     }

Also I defined the _ID column.

Code Of DBHelper

@Override     public void onCreate(SQLiteDatabase paramSQLiteDatabase) {         String sql="CREATE TABLE tableEQ (_ID INTEGER PRIMARY KEY," +         " LAT TEXT, " +         "LON TEXT, " +         "MAG TEXT, " +         "Date TEXT, " +         "Place TEXT," +         "Depth Text," +         " ImageMap TEXT, ImageMap2 TEXT)" ;         paramSQLiteDatabase.execSQL(sql);     }

How to fix it?
1. Make sure the you have a Column of _id, the column name here is case sensitive. the internal logic use “_id” as a key query to the dictionary.
2. Since the DBCreation Logic once be invoked Once. So either Remove the DB file manually which is located in /data/data/yourappnamespace/databases
or just rename the table name in your sql to reflect the changes. otherwise, you keep polling the Prevous defined DB even you changed your code.

Windows Phone 7 Hardware

There are 50-60 Android Devices on the market now. also same number of Blackberry Devices(all added up since the beginning). Apple locked up the system and platform, so 5 devices only. (Iphone /3g/3gs Ipad/ITouch)How about Microsoft phone 7?

Compatibility across devices with different screen size/resolution comes to be handy for developers. balckberry SDK is a great example, most of the method need take care the backward capability. it looks like Microsoft defined a standard that the device will all be 800*480 or 480*320 in the first version of phone OS 7.

also they define several standard regarding the hardware capability. here is a Quick overview of the device hardware. Pretty all the popular hardware features like SIP, GPS, LocationService, Audio/Video API. Accelerator.


Keyboard

Textbox Integrates with SIP

SIP supports input scoping

Text,Url, Time,TelephoneNUmber, EmailNameorAddress



TOUCH

OOB Controls support for Touch
   Scroll viewer has built-in support for pan and flick

UIElements
Scale/Translate
  Raw Touch, Compatible With Sl3



TOUCH IN XNA

• TouchPanel
• TouchLocation
• ID for Corellelcoate.



• Different with Silverlight Application

Accelerometer



 



 

IT Runs on background Thread which is different with the UI thread. call Dispatcher.BeginInvoke TO Refresh UI Thread

Audio Input

Call the getdata method from the bufferready event

10 ms latency

Media

MeadiaElement

Only one Mediaelement , No VideoBrush.

Media support

H/W decode

MediaSreamSource (adjust quality based on bandwidth)

PlayReadyDRM

XNA Sound Effect Api

Supports polyphonic, Looping wave data

Check Flight Status

Vibration.



 

VabrateController.Default.Start( TimeSpan.FromSeconds(5));

.Stop //Stop it before the timespan

Location

Satellite

Accuracy+, Power,Speed,Indoors (-)

Cell Towers

Power,Speed (+) Accuracy,Wildness(-)

WIFI



 



 

public GeoCoordinateWatcher(GeoPositionAccuracy desiredAccuracy)
{
this.accuracy = desiredAccuracy;
this.Init();
}

Reference:
  Windows Phone 7 : http://www.windowsphone.com
  Mix 10 Phone 7 Videos and PPTs: http://live.visitmix.com/Videos
  Blackberry SDK: http://na.blackberry.com/eng/developers/

Android Application Icons – Phone Application, Calling,hang-up…

 

$ic_incall_end_thumb.png

$ic_incall_ongoing_thumb.png

$ic_incall_onhold_thumb.png

$ic_incall_ongoing_bluetooth_thumb.png

$btn_in_call_switch_off_disable.9_thumb.png

$btn_in_call_switch_off_disable_focused.9_thumb.png

$btn_in_call_switch_off_normal.9_thumb.png

$btn_in_call_switch_off_pressed.9_thumb.png

$btn_in_call_switch_off_selected.9_thumb.png

$btn_in_call_switch_on_disable.9_thumb.png

$btn_in_call_switch_on_disable_focused.9_thumb.png

$btn_in_call_switch_on_normal.9_thumb.png

$btn_in_call_switch_on_pressed.9_thumb.png

$btn_in_call_switch_on_selected.9_thumb.png

$green_selected.9_thumb.png

$red_selected.9_thumb.png

$ic_button_conference_end_thumb.png

$ic_button_conference_private_thumb.png

$ic_button_contacts_thumb.png

$ic_dialog_call_thumb.png

$ic_incoming_call_bluetooth_thumb.png

$ic_launcher_phone_thumb.png

$ic_menu_answer_call_thumb.png

$ic_menu_dial_pad_thumb.png

$ic_menu_end_call_thumb.png

$ic_menu_merge_calls_thumb.png

$ic_menu_silence_ringer_thumb.png

$ic_menu_swap_calls_thumb.png

$btn_in_call_round_disable_thumb.png

$btn_in_call_round_disable_focused_thumb.png

$btn_in_call_round_normal_thumb.png

$btn_in_call_round_pressed_thumb.png

$btn_in_call_round_selected_thumb.png

$ic_in_call_touch_round_add_call_thumb.png

$ic_in_call_touch_round_hold_thumb.png

$ic_in_call_touch_round_manage_conference_thumb.png

$ic_in_call_touch_round_merge_call_thumb.png

$ic_in_call_touch_round_swap_thumb.png

$ic_in_call_touch_round_unhold_thumb.png

$ic_in_call_touch_round_unhold_alt_thumb.png

$ic_jog_dial_answer_thumb.png

$ic_jog_dial_answer_and_end_thumb.png

$ic_jog_dial_answer_and_hold_thumb.png

$ic_jog_dial_decline_thumb.png

$ic_jog_dial_silence_ringer_thumb.png

$ic_jog_dial_sound_off_thumb.png

$ic_jog_dial_sound_on_thumb.png

$ic_jog_dial_unlock_thumb.png

$ic_jog_dial_voice_search_thumb.png

$incall_photo_border_med.9_thumb.png

$ic_in_call_touch_add_call_thumb.png

$ic_in_call_touch_answer_thumb.png

$ic_in_call_touch_dialpad_thumb.png

$ic_in_call_touch_dialpad_close_thumb.png

$ic_in_call_touch_end_thumb.png

$ic_in_call_touch_hold_thumb.png

$ic_in_call_touch_merge_call_thumb.png

$ic_in_call_touch_swap_thumb.png

$ic_in_call_touch_unhold_thumb.png

$ic_in_call_touch_dialpad_close_thumb[1].png

$dial_num_star_blk_thumb.png

$dial_num_star_wht_thumb.png

$ic_dial_action_call_thumb.png

$ic_dial_action_delete_thumb.png

$ic_dial_action_voice_mail_thumb.png

$ic_dial_number_blk_thumb.png

$ic_dial_number_wht_thumb.png

$ic_menu_contact_thumb.png

$ic_tab_selected_contacts_thumb.png

$ic_tab_selected_dialer_thumb.png

$ic_tab_selected_recent_thumb.png

$ic_tab_selected_stared_thumb.png

$ic_tab_unselected_contacts_thumb.png

$ic_tab_unselected_dialer_thumb.png

$ic_tab_unselected_recent_thumb.png

$ic_tab_unselected_stared_thumb.png