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: Continue reading

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.
  2. Continue reading

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. Continue reading

Adding events to native calendar in PhoneGap iOS application

Introduction:
While developing a PhoneGap application, I got a new requirement to add an event to native calendar from the application. So that user can get aware of the details of the event from native calendar.

Description:
To implement the same, I goggled for while and found a nice and interesting plugin which is very easy to integrate and works with PhoneGap smoothly. It allows the user to add the event to calendar of that device. Here are the steps bellow which will guide to integrate the calendar plugin in PhoneGap iOS application.

1. Download the calendar plugin from github by using this URL.
https://github.com/EddyVerbruggen/Calendar-PhoneGap-Plugin/tree/pre-3.0
Continue reading

Control asynchronous processes by multiple callbacks using Deferred

Introduction:
To control the synchronous or asynchronous flow, there may be more methods but we will do this by multiple callback mechanism using deferred and promise object.

Description:
In order to use this mechanism first we need to have an understanding of deferred and promise object.
Here we will use a promise with a deferred object.
A promise is a placeholder for a result, which is initially unknown. While a deferred represents the computation that results in the value. Every deferred has a promise, which functions as a proxy for the future result.
A promise is a value returned by an asynchronous function, but a deferred can be resolved or rejected by its caller which separates the promise from the resolver. Continue reading

Copy existing sqlite database into PhoneGap iOS application

Introduction:
Usually PhoneGap supports SQLite database to interact locally. There might be a scenario where we need to create the database freshly or sometimes need to use the existing database. The idea of writing this blog came to my mind while encountered a question in stackoverflow site.  In this blog we will focus on importing existing database into our PhoneGap application and use the same to interact with our application.

Description:
Lets have a pre-populated database having tables with data which needs to be imported to our application. It will help us to minimize our effort in creating the database freshly to the application on its startup. For this we need to follow the bellow steps.

Step 1 : Remove the .sqlite extension from the sqlite database. Ex. If we have the database called DummyDB.sqlite make it only DummyDB.
Continue reading

Bubbling effect and its solution using corona SDK

Introduction :
The bubbling effect is a very common issue produced while developing cross platform mobile applications.

Bubbling Effect?? What’s that ??
Let’s assume a layout in which we have a parent box having a child box and both of them having their own click/touch event. Now if anyone clicked/touched the child box, ideally event associated with the child box should get fired. But here, along with this the event associated with its parent box will also gets fired.
Meaning on click of child box, both the events associated with child and its parent gets fired. Let’s get the solution for this issue, which is described in below screen cast.

Summary :
The above video described the bubbling effect caused in an app and the solution to handle this issue using Corona SDK.

THAT’S IT

Presented By: Raju Mahato, Software Developer, Mindfire Solutions