Mobile GPS cannot detect

Take your SIM out of the Nexus One
Power on the device
Turn WiFi on
Turn GPS on
Open application: GPS Status
Go into its Settings menu
Click on GPS and Sensors
Click Manage A-GPS state
Click Reset
Click Manage A-GPS state again
Click Download
Now put your phone on a stable, straight surface in order to enable the phone to get a lock. This time, you’ll see your phone get the lock back way faster than before.
With that done, now it’s time to put your SIM back in and use the network to secure a quick GPS fix as well.

資訊隱藏

 這星期突然對好久前做的研究好有興趣因手機越來越強，想把它在手機運行。特別找回一篇當年(1999)我在 San Jose, CA present 的文獻

 

Selective block assignment approach for robust digital image watermarking

Kam-Shing Ng, Lee Ming Cheng, City Univ. of Hong Kong (Hong Kong)

Abstract

Digital watermark is used to protect digital image against any illegal reproduction and tampering. In the selective block assignment process, the image is divided into N X N pixel blocks and each block is Discrete Cosine Transformed (DCT). The set of blocks will be then selectively chosen to encode the copyright message. Each selective block will be incremented by a value, in order to maintain the invisibility of the watermarking image, the incremented value should be within a range. The selection of blocks is based on measurement of the content. Depends on the amount of messages stored and the signal to noise ratio (SNR) of the resultant image required, a threshold is decided. In practice, the threshold will be set such that the duplicated message or an error correction mechanism can also be included in order to increase its robustness. The decoding process should be carried out by using the threshold values to get back the locations that have watermark information. Then the watermarked image is subtracted from the original image to obtain the secret data. Simulation results show that the watermarked image looks visually identical to the original and with an SNR of 44.7 dB for Lenna and with SNR 43 dB for airplane with size 256 X 256 pixels.

好覺得這個領域就快出現 普遍性的用途。我亦會先在我的小學網站試用，相信能成一時佳話。

Sign Google App

<quoted from other web>

You need to create Release Key for Signing your Application.

Step : 1 Right Click Project->Export Application->Select you Project->Next->Select new Keystore -> Complete all rest Steps

Step : 2 Note down your Alias name and Password given.

Step : 3 Now if you Complete all process of Filling Details you will get one .apk file and keystore file in you stored location.

Step : 4 Now Again Right Click Project->Export Application->Select you Project->Next->Use Existing Keystore -> Give location and password->Next

Step : 5 Now you alias name will comes in your Drop Down->Select it -> Enter Password -> Next

Step : 6 It will ask for location to store your final .apk file.

Step : 7 Select your location and store.

Step : 8 Now this Final .apk file is Your Signed Application.

Note : Keep this keystore file for further updated of your Application in Android Market ,also keep track of your Alias name and Password

GCM (Google Cloud Messaging)

http://developer.android.com/guide/google/gcm/gs.html

Change from C2DM to GCM on 28 Jne 2012

According to the document, migration is simply change the email into API key.

Migration is simple! The only change required in the application is replacing the email account passed in the sender parameter of the registration intent with the project ID generated when signing up for the new service. For example:

Intent registrationIntent = new Intent("com.google.android.c2dm.intent.REGISTER");
// sets the app name in the intent
registrationIntent.putExtra("app", PendingIntent.getBroadcast(this, 0, new Intent(), 0));
registrationIntent.putExtra("sender", senderID);
startService(registrationIntent);

LumiaChallenge 2012

 剛提交了三個作品到 Nokia 參加 LumiaChallenge 2012 的比賽，順便做個記錄。

CDict - When we type English passage, we always forget a word or how to spell a word.  This movie shows how to type the word using the language you know (in this example Chinese) directly into the editor and do the translation in cloud (Microsoft translation in this example) instantly.  The program can  intelligently check the Chinese inside.  Thus, it saves lots of time to check from web or dictionary and come back to type the passage.  In this movie, one sentence is for demo purpose.  In future, a whole passage can be done in any-input-language to any-output-language.

video demo - http://youtu.be/4ekTQBW696M  

人生計算機 - 我們每天都不自覺地問到人生的問題。本程式嘗試給出一個參考。透過古人的生活體驗，歸納出來的人生法則，我們把它量化做成這程式。程式包括二部份。1.每天的開心指數 2.人生的反思首部份只要把相關出生年月日輸入，程式就會把結果化為圖像。第二部份，用家輸入英文，程式會給出所佔人生部份的比例。 *以上並非隨機結果，亦只作為參考用途。

video demo - http://youtu.be/cQaBmbQvrvk

QueuEasy

With QueuEasy, we do not need to spend time on service waiting anymore. We can shop around until the shop pushes you back. This app requires to work with www.queueasy.com

video demo -  http://www.youtube.com/watch?v=T_0wNscfixQ&feature=relmfu 

iOS token

From : http://davehiren.blogspot.com/2012/03/get-device-token-for-apple-push.html

Get device token for apple push notifications in sencha touch and phone gap

Hello,

Recently I was working on Apple push notifications with sencha touch and phonegap project. Requirement was to get device token in JavaScript file so that it can be sent to server for getting push notifications. For that first thing we need to do is register device to get Push notifications.

Please make sure that you have real apple device like iPad, iPhone or iPod touch to test this. This will not work in Simulator.

To register device for push notifications add following in your AppDelegate.m file.  Find method

- (BOOL) application:(UIApplication*)application didFinishLaunchingWithOptions:(NSDictionary*)launchOptions

Also add following line to define token variable.

@synthesize token;

and add following code at end of the method.

NSLog(@"Registering for push notifications...");    

    [[UIApplication sharedApplication] 

     registerForRemoteNotificationTypes:

     (UIRemoteNotificationTypeAlert | 

      UIRemoteNotificationTypeBadge | 

      UIRemoteNotificationTypeSound)];

This will register device for getting push notifications. Please make sure that you have added provisioning profile which configured with non wild card app id and app is configured to receive  push notifications in your development portal. Also you need valid developer certificate.

After that you need to add following methods at end of the file.

- (void)application:(UIApplication *)app didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken { 

    

    self.token = [[[[deviceToken description]

                    stringByReplacingOccurrencesOfString: @"<" withString: @""]

                   stringByReplacingOccurrencesOfString: @">" withString: @""]

                  stringByReplacingOccurrencesOfString: @" " withString: @""];

    

    NSLog(@"My token is: %@", self.token);

}

- (void)application:(UIApplication *)app didFailToRegisterForRemoteNotificationsWithError:(NSError *)err { 

    

    NSString *str = [NSString stringWithFormat: @"Error: %@", err];

    NSLog(str);    

    

}

- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)userInfo {

    

    for (id key in userInfo) {

        NSLog(@"key: %@, value: %@", key, [userInfo objectForKey:key]);

    }    

    

}

This will get device token and store it to token. Now to send this token to JavaScript we will create a phonegap plugin. Please make sure that this code will work with Phonegap version 1.5.0. They named this version as Cardova.

First create folder inside plugins folder of your project folder and name it as PushToken and add two files to it PushToken.m and PushToken.h

Open PushToken.h file and add following code to it.

#import <Foundation/Foundation.h>

#import <Cordova/CDVPlugin.h>

@interface PushToken : CDVPlugin{

    

    NSString* callbackID;  

}

@property (nonatomic, copy) NSString* callbackID;

- (void) getToken:(NSMutableArray*)arguments withDict:(NSMutableDictionary*)options;

@end

Now open PushToken.m file and add following code to it.

#import "PushToken.h"

#import "AppDelegate.h"

@implementation PushToken

@synthesize callbackID;

-(void)getToken:(NSMutableArray*)arguments withDict:(NSMutableDictionary*)options  {

    self.callbackID = [arguments pop];

    

    NSString *token = ((AppDelegate *)[[UIApplication sharedApplication] delegate]).token;

    

    CDVPluginResult* pluginResult = [CDVPluginResult resultWithStatus:CDVCommandStatus_OK messageAsString:[token stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];

    

    if(token.length != 0)

    {

        [self writeJavascript: [pluginResult toSuccessCallbackString:self.callbackID]];

    }else {    

        [self writeJavascript: [pluginResult toErrorCallbackString:self.callbackID]];

    }

}

@end

Now we have to map this plugin. For that open Cordova.plist file and following key value pair to it.

PushToken : PushToken

After that open AppDelegate.h file and add following line to it.

@property (retain, nonatomic) NSString* token;

That's it of phonegap side now we have to create JavaScript file form where we will execute this plugin code. Create JavaScript file with name PushToken.js and add it to www folder. Add following code to it.

var PushToken = {

    getToken: function(types, success, fail) {

        return Cordova.exec(success, fail, "PushToken", "getToken", types);

    }

};

Add link of this JavaScript file to your index.html page after phonegap JavaScript file. To get device token wherever you want use following code.

PushToken.getToken(     

                     ["getToken"] ,           

                     function(token) {

                              global.token = token; 

                     },

                     function(error) {

                              console.log("Error : \r\n"+error);      

                     }

          );

That's it and you have your device token.

排隊apps

點樣解決排隊問題??睇睇以下片段