List of Tablet and Smartphone Resolutions and Screen Sizes

Manufacturer	Model	Screen Size	Resolution	Type
Acer	Iconia Tab	10.1″	1280×800	Tablet
Amazon	Kindle Fire	7″	1024×600	Tablet
Apple	iPad	9.7″	1024×768	Tablet
Apple	iPad 2	9.7″	1024×768	Tablet
Apple	iPad 3	9.7″	2048×1536	Tablet
Apple	iPhone 3GS	3.5″	480×320	Smartphone
Apple	iPhone 4S	3.5″	960×640	Smartphone
Apple	iPhone 5	4″	640×1136	Smartphone
ASUS	Transformer TF101	10.1″	1280×800	Tablet
ASUS	Transformer Prime TF201	10.1″	1280×800	Tablet
Barnes & Noble	NOOK	7″	1024×600	Tablet
BlackBerry	Playbook	7″	1024×600	Tablet
BlackBerry	Torch 9800	3.2″	480×360	Smartphone
BlackBerry	Torch 9810	3.2″	640×480	Smartphone
Colby	Kyros	7″	800×480	Tablet
HP	TouchPad	9.7″	768×1024	Tablet
HTC	Amaze 4G	4.3″	960×540	Smartphone
HTC	Evo 3D	4.3″	960×540	Smartphone
HTC	Flyer	7″	1024×600	Tablet
HTC	Sensation 4G	4.3″	960×540	Smartphone
HTC	Thunderbolt	4.3″	480×800	Smartphone
Lenovo	IdeaPad A1	7″	1024×600	Tablet
Lenovo	ThinkPad	10.1″	1280×800	Tablet
LG	G2x 4G	4″	800×400	Smartphone
LG	G-Slate	8.9″	768×1280	Tablet
Motorola	Droid BIONIC	4.3″	540×960	Smartphone
Motorola	Droid RAZR	4.3″	540×960	Smartphone
Motorola	Droid Xyboard 10.1	10.1″	1280×800	Tablet
Motorola	Xoom	10.1″	1280×800	Tablet
Nokia	Lumia 900	4.3″	480×800	Smartphone
Samsung	Brightside	3.1″	240×320	Smartphone
Samsung	Epic 4G Touch	4.52″	800×480	Smartphone
Samsung	Exhibit 4G	3.5″	480×800	Smartphone
Samsung	Focus Flash	3.7″	480×800	Smartphone
Samsung	Galaxy S 4G	4″	480×800	Smartphone
Samsung	Galaxy S II	4.52″	800×480	Smartphone
Samsung	Galaxy S III	4.8″	1280×720	Smartphone
Samsung	Galaxy Tab	7″	1024×600	Tablet
Samsung	Galaxy Tab 7.7	7.7″	1280×800	Tablet
Samsung	Galaxy Tab 10.1	10.1″	1280×800	Tablet
Samsung	Gravity Smart	3.2″	320×480	Smartphone
Samsung	Sidekick 4G	3.5″	800×480	Smartphone
Sony	Tablet S	9.4″	1280×800	Tablet
T-Mobile	MyTouch 4G Slide	3.8″	800×480	Smartphone
T-Mobile	SpringBoard	7″	1280×800	Tablet
Toshiba	Thrive	10.1″	1280×800	Tablet

Procedure To Root Samsung Galaxy SII i9100

Points to be taken care of before Proceeding ahead:

• Warranty will be void by rooting the device but you can get it back by unrooting the phone.
• Download all needed Tools/software.
• You may loss device data, so make a backup of all the data like messages, call history, pictures etc before rooting process.
• Battery of the phone should be charged properly at least to the half level.
• The updated USB driver of device should be installed on system to communicate properly with the device.
• Samsung Galaxy SII should be updated to the latest firmware XWKDD.
• Save the APN Setting, it will be needed after the root process to surf the internet again.

Tools Needed:

1.      ODIN Downloader (Download it from here)

2.      Download SuperOneClick

3.      XWKDD Kernel (Don’t extract it after download, it will use in the Odin process)

4.      USB Data Cable

5.      Samsung’s KIES 2.0 

Procedure:

Step 1: Make sure that you have downloaded and installed all the needed software. Now, set device in USB debugging mode: Settings ->Applications -> Development -> USB debugging.

Step 2: Reboot your device in the download session mode. To get enter in the download mode of Samsung Galaxy SII, switched off the device and turn it on again by holding Volume down button + Home button and Power button simultaneously. You will surely reach to the download mode. This will show screen as mentioned below in picture, on your phone screen.

Step 3: Open ODIN Downloader and install it on your pc.

Step 4: Now, using USB Cable connect the device to computer and keep Odin open. Wait for few seconds then ODIN will notify that the device is connected to the computer. Select the checkboxes next to “Auto reboot” and “F. Reset Time” and kept default else options. After this, press “PDA”  Button and select the XWKDD_insecure.tar file which you have downloaded on your pc already. Now Press “Start” button, after pressing the start button, ODIN will flash the kernel and after flashing, it will reboot phone.. Do not disconnect the device from PC while rebooting.

Step 5: Once the device has been restarted, Open SuperOneClick and press the “Root” tab and restart the device again. Now you have successfully rooted your Samsung Galaxy SII device. 

Types of Mobile Application

Mobile Application 'Types' is quite confusing topic. Here is the description of Application 'Types'

1. Browser Access: The applications which we are accessing through native browser. Ex : m.yahoo.com, www.google.com, m.redbus.in

2. Hybrid Apps: We are installing the application in our device and for the functioning of that particular application internet is required. Ex : Social Networking Apps(Facebook, Twitter), Instant Messengers(Skype), E-Commerce(Flipkart), Internet Speed Testing(Speedtest)

3. Hybrid Apps: We are installing the application in our device and if required we are connecting it to internet also. Ex : Few games in which we can play alone and we go online too for playing with different players(multi player). And any medical apps where u want to keep a track record of your health and later want to share with your friends or doctor via internet.

4. Native Apps : The applications which we are installing in our device. Ex : Reminders, Few Games etc.

It can be further understand by the communication medium of the apps:

Native Apps- Which can be installed in the devices and the app does not need any data transfer to the server. With out network these apps work in the device. The data about the app will be stored in the device itself. Example Gaming applications. Here the device memory and configuration is very important as the app completely dependent on this.

Client Server apps- They can be called Semi native apps. Here the app can be installed in the device. But the with out a network it cannot be launched. Because It gets the data from the server. With out the data the app will not proceed further. Example Commercial apps like Banking app. Here you basically can see the form UI but the all the data comes from the server. So the device memory is partially dependent just to install the app as the data comes from the server for every service call.

Mobile Web applications.- They can be called as Mobile browser apps as these are not installed in the device. these can be accessed using the mobile browser by hitting the Url of the web. Here the device memory size is not all important as neither of the from or the app data is stored in the device. It is Completely dependent on the quality of the browser. Every thing comes from the server and rendered in the browser when you hit the url.

Comparison between Native Apps, Hybrid Apps and Mobile Apps:

1.Skills/tools needed for cross-platform apps:

Native: Objective-C, Java, C, C++, C#, VB.net

Hybrid:HTML, CSS, Javascript, Mobile development framework (like PhoneGap)

Mobile web:HTML, CSS, Javascript

2.Distribution:

Native:App Store/Market

Hybrid:App Store/Market

Mobile web:Internet

3.Development Speed:

Native:Slow

Hybrid:Moderate

Mobile web:Fast

4.Number of applications needed to reach major smartphone platforms

Native: 4

Hybrid: 1

Mobile web: 1

5.Ongoing application maintenance

Native: Difficult

Hybrid: Moderate

Mobile web: Low

6.Device access

Native: Full access(Camera, microphone, GPS, gyroscope, accelerometer, file upload, etc

Hybrid: Full access(Camera, microphone, GPS, gyroscope, accelerometer, file upload, etc

Mobile web: Partial access(GPS, gyroscope, accelerometer, file upload

7. Advantages

Native: Lets you create apps with rich user interfaces and/or heavy graphics

Hybrid: Combines the development speed of mobile web apps with the device access and app store distribution of native apps

Mobile web: Offers fast development, simple maintenance, and full application portability. One mobile web app works on any platform.

8. Disadvantages

Native: Development Time, Development Cost, Ongoing Maintenance, No portability (apps cannot be used on other platforms)

Hybrid: handle heavy graphics, Requires familiarity with a mobile framework

Mobile web: handle heavy graphics, Can't access camera or microphone

Android Architecture

Linux Kernel

Android OS is built on top of the Linux 2.6 Kernel

–Linux Core functionality

•Memory management

•Process management

•Networking

•Security settings

–Hardware drivers

Android’s native libraries

–Libc: c standard lib.

–SSL: Secure Socket Layer

–SGL: 2D image engine

–OpenGL|ES: 3D image engine

–Media Framework: media codecs

–SQLite: Database engine

–WebKit: Kernel of web browser

–FreeType: Bitmap and Vector

–SufraceManager: Compose window manager with off-screen buffering.

Android Runtime

•Core Libraries

–Provides the functionality of the JAVA Programming Language

•Dalvik VM

–A type of Java Virtual Machine

–Register based (not stack machine like JVM)

–Optimization for low memory requirements

–Executes .dex (Dalvik-Executable) files instead of .class

–DX tool converts classes to .dex format

Application Framework

•The blocks that our applications directly interact with.

•Important blocks:

–Activity Manager: Manages the activity life cycle of applications

–Content Providers: Manage the data sharing between applications

–Telephony Manager: Manages all voice calls. We use telephony manager if we want to access voice calls in our application.

–Location Manager: Location management, using GPS or cell tower

–Resource Manager: Manage the various types of resources we use in our Application

Applications

•This is where our applications are placed.

•Some pre-installed applications:

–SMS client app

–Dialer

–Web browser

–Contact manager

•As developers, we are able to write an app which replaces any existing system app.