Upload Failed : You uploaded a debuggable APK

It was quite late in the evening and I was about to wrap up my work. Suddenly I got a call form my client in Skype and he shared his concerns of uploading the build to production. Although it was late, I thought to help him before I close the day, since that guy is in the middle of his day time (in US). Now mind set is to spend time on the issue. I started looking into the issue.

The issue is, while he (my client) started uploading the APK file into the Android store, he is receiving the below rejection message from the store.

jQuery with WinJS in Windows Store Application

Introduction
As we all know, we can design Windows store applications using HTML, CSS and JavaScript. We can use jQuery along with the WinJS as well.

Description
Let’s open up the Visual Studio and create a new navigation project under JavaScript with a name called jqTest.
Now we will get the project created and opened with the default.html page.

 

Let’s get download the jQuery and place that in js folder in Solution Explorer.

Behavior of WinJS.Promise.Join during Exceptions

Introduction

Promise is an object, which promises the user to get back the values or do some task after performing the promised activity without hampering the main UI. The execution of the other activities will work as normal. So in single word we can say, it is asynchronous.

The JOIN method of the Promise works like a waiter in the restaurant, waiting for the whole order from a table from each person. We can club separate promise objects and join them together. Join ensures to perform a task after all the promise objects finished their execution.

Queries encountered on the above

On all the above, I encountered the query,

• what will happen when any of the Promise gets an error ?
• Will it able to club the output and wait for the promises ? OR it will quite the execution ? Etc. etc.

After some of the homework and trials below are my findings.

CRUD operation in PhoneGap application using SQLite Database

Introduction:
Few days ago I received a comment from one of the reader of my blog to show an example on CRUD (Create, Read, Update and Delete) with the database. So in this post we will explore the use of CRUD operation using SQLite database in PhoneGap application.

Description:
CRUD can be described as a process, which helps the user to add, view, search and modify the information inside the database.

Here are the basic steps which demonstrates CRUD operation.

• Create or add new entries
• Read, retrieve, search or view existing entries
• Update, modify or edit existing entries
• Delete, deactivate or destroy existing entries

Before doing any operation on database let’s initialize the database first, either using HTML5 local database concept or using SQLite plugin.

Saving user preferences in iOS using Xamarin

Introduction:
Xamarin provides a number of ways to save data in iOS using Local Storage. User preferences are generally stored in Library/Preferences/.
Xamarin iOs provides its built in mechanism i.e. instead of creating files directly in the directory it is suggested to use NSUserDefaults class to save data.

Description:
NSUserDefaults class provides its own built in mechanisms to save float, double, integers, Boolean and URL data. To save a custom object it should be converted to NSData object using NSUserDefaults.

Panorama control in Windows Phone

Introduction:
Windows Phone comes with a number of controls for display. Among them the Panorama Control is one the new controls for user interaction and display.

Description:
Panorama Control spans beyond the screen and helps user to chose from a number of panorama items. Each panorama item can consists of Grids, Stack Panels and other Phone controls. Image applied to Panorama as background spans across all the panorama items. Only one panorama item is visible at a time and user can make selection from it. A swipe gesture gives the next or previous Panorama item.

Displaying alert dialog in Android using Xamarin

Introduction:
Alert dialog is a important part of any application. Conveying various information, error messages and even for taking confirmations from user can be done through alert dialog. Xamarin provides it’s own way of showing alert and conveying messages to the user.

Description:
Alerts in Xamarin are, an object of AlertDialog.Builder class, where AlertDialog is a subclass of Dialog class. Builder() is a method of AlertDialog class, which creates an alert dialog to display. We can add multiple buttons to this alert dialog. The builder takes the current context (Activity) and shows the Alert Box in the main thread(The UI thread).

Relative layout design in Android using Xamarin

Introduction:
Xamarin provides different layout for designing the user interface in Android.
Some common ones being used are Relative Layout, Linear Layout, Grid Layout, Table Layout, Frame Layout etc. Most of them are understandable from their name itself. Here we will discuss about how to design using Relative Layout in Xamarin for Android.

Description:
As the name suggests, Relative Layout mainly makes use of the controls present in the Designer and places controls relatively to each other. The most important aspect of this design being the First element placed inside the tag. The places itself depending on the properties set for the children in the Relative Layout.
For example:

Fix the Web View shrink issue in iOS7 using PhoneGap

Problem:
I received a bug ticket from my client about the unusual behavior of my application UI. It was a problem which was occurring only in iOS7 only.
When the keyboard pops up in iPad devices running on iOS7 the web view of our app gets shrink (app development using Phonegap).

Solution that works for me :
This problem can be solved in few steps.

1. We need to go to Config.xml and inside the preference tag just need to set the value of KeyboardShrinksView to false.

Signing Identities and Certificates in iOS

Introduction:
When we start off as an iOS Developer, we all face a common obstacle ,that is generating the certificates and using it in our apps because Apple does not allow us to debug or run our app without Certificate. So we need an Apple Developer Certificates to develop ,debug and run.

Description:
In order to know the types and procedure to use it, first we need to have an understanding of code signing and why it is needed. So lets start with it.

Code signing our app is necessary because due to this only users trust that our app has been created by a source known to Apple. All iOS apps must be code signed and provisioned to launch on a device or to be distributed for testing, or to be submitted to the store.