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Java Programming - Step by Step Tutorial

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How to create an Android Application

Android is an Linux based operating system designed mainly for touchscreen mobile devices.

Android is an open source this code released by Google under Apache License. Open source is a free code someone can access the code and develop their own code and create applications.
Firstly we have to know how to develop first android application. For this we have to follow a scenario, mandatory we need some software applications,

1. Download Android SDK (Software Development Kit)
   
2. If you will use Eclipse IDE, then you have to install ADT Pligin (Android Development Tools)
   
3. By using SDK Manager you have to download the latest SDK Tools
   

It is very easy by creating the android application using Eclipse IDE, otherwise we have to use command line tools to do an android application.

Here I have given how to develop an android application by using Eclipse IDE.
Before we are going to start first we have to install Android SDK and ADT Plug-in, then we follow some procedure,

1. Click New in the toolbar.
   
2. After clicking on new, we select Android folder and select Android Application Project and click Next.
   
3. After clicking on Next one window “New Android Application” appears, in that there are some options are available, those are:
   
   
   
   
   

Application Name:

We have to write the name of the application, this name is visible to users.

Project Name:

We have to set a name of the project this is acts as a root directory of your project.

Package Name:

Package contains set of classes, so for your project you have to create one package is that follow the Java Progrmming Language instructions because android is developed by using Java Programming Language. We have to select unique name for your package, for example com.example.UniqueName


Minimum Required SDK:
 
It is the minimum required SDK that support for your application. If you want to support all the devices, then you need to select minimum SDk for your application.

Target SDK:

It is the highest version of your Android that set for your Application.

Compile With:

By using which version you have to compile your application. By defaultly it takes latest versions. If there is no availability, then you select older version that supports for your application.

Theme:

It is the UI (User Interface), in which style you to apply your app.

After Completion of all the things click on Next. Then one window will be appearing in that window you have to choose an option default settings and click Next.

Next you set your application icon click on Next. Then you select an activity template like Blank Activity then click on Next. This is the way you have to create application and start your project programming.

Commands for Administrators

Most of windows 7 issues are solved by accessing various commands. These commands can be beneficiary for solving threats of troubleshooting in windows 7. Few of them are listed below,

1)sfc /scan now (System File Checker)

On accessing this command we can run system file checker and verification of windows system files. Now a day’s several malicious applications are available to manipulate the system control.

2) sigverif (Signature Verification)

This command is useful in verifying entire system files which are digitally signed resulting in enhancing the integrity of system. With file signature verification tool we can cross check the all system files. This tool is extracted from the command prompt but it depends on GUI interface, so all operations are executed quickly.

3) driverquery (Driver Query)

This command illustrates the entire driver list installed on your system. And you can trace out if any driver is malfunctioned to improve the performance of a system. Some options are available to give more info

i) driverquery – V

ii) driverquery – si

By using those options, we can find the signature information of the drivers.

4) nslookup hostname

This is used check DNS (Domain Name System) name resolution functionalities. This tool solves many issues of Trouble shooting and other legacy DNS Records that still exist. Instead of host name you specify the host address.

5) Ping IPAddress

This command is required to monitor the TCP/IP network connection. This command works only when ICMP (Internet Control Message Protocol) protocol is passed between two systems. In contrast, if your firewall gets blocked, this command malfunctions.

In the relevant way in typical situations if ping fails then pathping is utilized , it is developed mainly for several routers exists between hosts, syntax of the command is similar to ping, i.e.: pathping IPAddress

6) ipconfig

If you need to view or change your IPAddress use ipconfig command.

a) ipconfig /all

This command is used to view a full system IP Configuration in your system.

b) ipconfig /release

c) ipconfig /renew

If you have DHCP (Dynamic Host Configuration Protocol) deployed in your system then you can release and renew your IP Address by using the above commands.

7) Repair-bde

If your drive gets encrypted by using bit locker, if you’re facing any issues to recover the data then repair-bde command is used it has two attributes “-rkey” and”-rpassword”. And you must specify the source and destination drives. Syntax is,

Repair-bde -rkey | -rpassword


8) tasklist

This command is used to give the list of services that are running on your computer. This acts like a Task Manager.

Suppose if you wish to terminate a process in your system then taskkill command is required. Syntax is,

taskkill service name | process id name.

9) System info|more

To generate the text summary of your system we use System info|more command.