a new update will be available for galaxy s3 device version 4.2.1

a new update will be available for galaxy s3 device version 4.2.1

Several months passed until the launch of the Android 4.1 (Jelly Bean) for Galaxy s3 devices
but Sammobile  website says that  Samsung  prepares the new version 4.2.1 Android operating system for S3 devices
and it says that the new version 4.2.1 is under experiments so it will be finished and officialy released before the announce of the Samsung Galaxy S4 device

 

some of the new features of the new version of Android 4.2.1 :
1- Improvements to the Device lock screen .
2-The ability to install tools on the  lock screen.
3 -DayDream - is a Screen Saver shows you the weather and notifications .
4-- Additions to the notification center  such as adjust the speed and duration of appearance
5-- Improvements and new settings in the  notifications bar.
6- Many improvements on the use of the voice instructions.

 

 galaxy s3 Android 4.2.1 Samsung Android Jelly Bean

Android Tips And Tricks

Android Tips And Tricks

Launch the camera in just one move. 

On most phones running the latest Android OS, you can customize your lock screen for fast access. On the Samsung SIII, for example, you can simply press and hold the center of the lock screen, rotate the phone 90 degrees while still holding the center of the screen — and boom; the camera launches. To enable this feature, go to Settings, Security, Lock Screen Options, and then turn on CAMERA QUICK ACCESS. On older android phones you can use an app like WidgetLocker to get the camera icon onto your lock screen. Added bonus: With WidgetLocker, you can customize your lock screen with whatever functions you like to access quickly.

 

Voice Control. 

Once you get the camera fired up, many newer Androids also offer voice control. Set your camera on a tripod or Gorillapod and say "Shoot." After a one-second delay (just long enough to smile), the camera will snap the shot. This is great for self-portraits and group shots.

If you have an older Android phone, Camera ZOOM FX gives you the same voice control, plus some awesome additional powers — stabilizer, time lapse, and Burst Mode, which lets you take up to 10 shots in a second.

Screen Capture
Say you want to do a screen grab of a web page — or maybe you have a cute sequence of texts you want to save forever — whatever. Depending on the model and flavor of Android you have, some key combos will do the trick. On some versions, press the Home key and Power buttons at the same time; on others, it's Volume Down and Power. On older phones, you can get an app like Screenshot It, which enables you to capture what's on your phone's screen, just not with the quick key combos of newer phones.

Fast Reboot
Powering down your phone normally takes two moves, and restarting takes a third. But if you hold down the power button for 10 seconds, it'll reboot with just one move. This should work on most Android phones.

Managing Battery Life & Speed 
The best way to improve your phone's battery life and speed is to keep the number of open apps to a minimum. But how do you know what's open? Answer: The Task Manager lists the programs that are currently operating in the background, draining your battery. But instead of scrolling through menus to find the Task Manager, you can launch it immediately by holding down the Home key. You should now be able to see a list of all apps that are currently running. From the same screen, you can close anything that isn't mission critical.

Start Building Apps for Android

Start Building Apps for Android

 

 

if you  want to start building  applications for android you can just download the ADT bundle and

WOWWW start coding the bundle includes the  Android SDK and the Eclipse IDE and

the latest android system image for the emulator and the latest andriod sdk tools so lets Begin :)

Android ADT Bundle (windows 32bit)

android ADT Bundle (windows 64bit)

Introduction to Android

Android In depth
What is Android?

 

Learn Android

 

what is Android :

Android is a Linux based operating system for mobile
devices such as smart-phones and tablet computers.
It is developed by the
Open Handset Alliance
led by Google
Android is made by open handset alliance

Open Handset Alliance
Created to accelerate the creation and development of
mobile devices and applications
Android Now!
Mobile devices by: HTC, Samsung ..

OS Basics 

OS Def
Def: [Wikipedia]
An operating system (OS) is a set of programs that
manage computer hardware resources and provide
common services for application software. The
operating system is the most important type of system
software in a computer system. Without an operating
system, a user cannot run an application program on
their computer, unless the application program is self
booting.
OS Function
Software Applications
OS
Hardware Resources
Main Function of OS
is managing, linking
and helping
application to deal
with OS

Kernel
Lowest part - nearest to hardware
Contains hardware drivers
Responsible for executing commands to hardware
peripherals
Libraries
Low level developer interface
Contains functions developer can call to communicate
with hardware
 
Dalvik VM

 

It is min size/light weight Java virtual machine
To run Java on linux you need JVM, android app is
Java app, Android OS is linux and Dilvak is the JVM
Tools
Setting up the
environment

Basic Tools Needed
Eclipse
JRE
JDK
ADT [eclipse plugin]
Android SDK [AVD Manager, Compiler, Debugger,
Simulator]

API Levels
Android SDK has versions according to the Android OS

release version
Each SDK version has an alternative number
SDK versions can be Android 2.3 or Google API, the
last one means an Android SDK including the Google
Maps 

Steps
Download and install JRE, JDK

Download and open eclipse

Install ADT
Download the SDK
Link the eclipse with the SDK directory

3- simple Hello Egypt Android Application :)

   3-Our first Android Application will be  - Hello Egypt


Hello Egypt :)

<> the application will be a basic application that contains a textview that just view "Hello Egypt"  when pressing a button

 

---------

you should have :

Eclipse
and the Android SDK also and its connected with Eclipse IDE

note : if you want to download them  please refer to the last articles

of  Android prerequisites

1 -  The first step  is to open Eclipse IDE like the image :
Eclipse

2- it should look like that - if  its open in another view its ok

it should be based on the user that uses it





Learn Android



3 - then  we create a new project follow that in order :

File > New Project >Android Application Project



Learn Android

 

 

 

 

 

 

 

 

 

 

 

 

and then press:
Next
4-   then  do like the following Image :



Learn Android

 

 

 

 

 

 

 

 

 

 

 

 

and follow :

Next> Next > Next > Finish





Learn Android



and in the next articles will will told you all about these elements

5- the application will be created with the name that we provide in the last step



Learn Android

6-  Here we just created a new project
then  select

Hello World
thats in the middle of the screen and then press

Delete  



7- Then select :
TextView , Button
and  just do like the following image





Learn Android



8-then   press  on  the like the previous image

activity_main.xml



Learn Android

 

 

 

 

 

 

 

 

 

 

 

i will told you about all that code in the coming articles

 

the  important element is :

Id

thats we will use on the code

9- then select

src > MainActivity.java

and  write the code like the following  image :

 




Learn Android

 

 

 

 

 

 

 

 

 

 

 

package com.example.helloegypt;
import android.app.Activity;
import android.os.Bundle;
import com.example.helloegypt.R;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends Activity {
TextView txt;

@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button btn = (Button)findViewById(R.id.button1);
txt = (TextView)findViewById(R.id.textView1);
btn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
txt.setText("Hello Egypt".toCharArray(),0,"Hello Egypt".length());
}
}); }
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.activity_main, menu);
return true;
}
}

10- after doing the last step and write all the code save the  work  (you can use the short cut CTRL+S )

 

and run the application using the Emlator like the following image :



Learn Android

 

 

 

 

 

 

 

 

 

 

 

 

and it should be like that  :)  and Happy Time

Learn Android

I hope that  it was clear for you . if need any questions just leave a comment :)

 

2- Your first App - Hello Android

 

2-  Hello World App :D 

your first Application will be Hello World

now  i will teach  you how to create  your  first application  with pictures

Before you start this lecture, be sure you have your development environment set up. You need to:

Download the Android SDK.

Install the ADT plugin for Eclipse (if you’ll use the Eclipse IDE).

Download the latest SDK tools and platforms using the SDK Manager. 

please  review  Android Pre-course Exercise

then first step : 

1 - Create a Project with Eclipse :

Figure 1. The New Android App Project wizard in Eclipse.

1. open  Eclipse, click New Android App Project  in the toolbar. (If you don’t see this button, then you have not installed the ADT plugin—see Installing the Eclipse Plugin.)
2. Fill in the form that appears:

<> Application Name is the app name that appears to users. For this project, use "HelloAndroid."
---------------------------------------

<>Project Name is the name of your project directory and the name visible in Eclipse.
---------------------------------------

<> Package Name is the package namespace for your app (following the same rules as packages in the Java programming language). Your package name must be unique across all packages installed on the Android system. For this reason, it's generally best if you use a name that begins with the reverse domain name of your organization or publisher entity. For this project, you can use something like "com.example.myfirstapp." However, you cannot publish your app on Google Play using the "com.example" namespace.
-----------------------------------------

<>Build SDK is the platform version against which you will compile your app. By default, this is set to the latest version of Android available in your SDK. (It should be Android 4.1 or greater; if you don't have such a version available, you must install one using the SDK Manager). You can still build your app to support older versions, but setting the build target to the latest version allows you to enable new features and optimize your app for a great user experience on the latest devices.
----------------------------------------

<>Minimum Required SDK is the lowest version of Android that your app supports. To support as many devices as possible, you should set this to the lowest version available that allows your app to provide its core feature set. If any feature of your app is possible only on newer versions of Android and it's not critical to the app's core feature set, you can enable the feature only when running on the versions that support it.

Leave this set to the default value for this project.

Click Next.
-----------------------------------------

 

1. The following screen provides tools to help you create a launcher icon for your app.
   You can customize an icon in several ways and the tool generates an icon for all screen densities. Before you publish your app, you should be sure your icon meets the specifications defined in the Iconography design guide.
   Click Next.
2. Now you can select an activity template from which to begin building your app.
   For this project, select BlankActivity and click Next.
3. Leave all the details for the activity in their default state and click Finish.

Your Android project is now set up with some default files and you’re ready to begin building the app.

----

Running Your App

If you followed the Steps  to create an Android project, it includes a default set of  "Hello World" source files that allow you to immediately run the app.

How you run your app depends on two things:

1- whether you have a real Android-powered device and whether you’re using Eclipse. This lesson shows you how to install and run your app on a real device and on the Android emulator, and in both cases with either Eclipse or the command line tools.

Before you run your app, you should be aware of a few directories and files in the Android project:

   AndroidManifest.xml

The manifest File  describes the fundamental characteristics of the app and defines each of its components. You'll learn about various declarations in this file as you read more training classes.

   src/

Directory for your app's main source files. By default, it includes an Activity class that runs when your app is launched using the app icon <Java class will be here >.

   res/

Contains several sub-directories for App resources . Here are just a few:

  drawable-hdpi/

  Directory for drawable objects (such as bitmaps) that are designed for high-density (hdpi)  screens. Other drawable directories contain assets designed for other screen densities.

   layout/

 Directory for files that define your app's user interface.

   values/

 Directory for other various XML files that contain a collection of resources, such as string and color definitions.

When you build and run the default Android app, the default Activity class starts and loads a layout file that says "Hello World." The result is nothing exciting, but it's important that you understand how to run your app before you start developing.

Run on the Emulator

 

---

Whether you’re using Eclipse or the command line, to run your app on the emulator you need to first create anAndroid Virtual Device (AVD). An AVD is a device configuration for the Android emulator that allows you to model different devices.

To create an AVD:

1. Launch the Android Virtual Device Manager:
   1. In Eclipse, click Android Virtual Device Manager from the toolbar.
   2. From the command line, change directories to<sdk>/tools/ and execute:

      android avd

2. In the Android Virtual Device Manager panel, click New.
3. Fill in the details for the AVD. Give it a name, a platform target, an SD card size, and a skin (HVGA is default).
4. Click Create AVD.
5. Select the new AVD from the Android Virtual Device Manager and click Start.
6. After the emulator boots up, unlock the emulator screen.

To run the app from Eclipse, open one of your project's files and click Run  from the toolbar. Eclipse installs the app on your AVD and starts it.

Or to run your app from the command line:

1. Change directories to the root of your Android project and execute:

   ant debug

2. Make sure the Android SDK platform-tools/ directory is included in your PATH environment variable, then execute:

   adb install bin/MyFirstApp-debug.apk

3. On the emulator, locate MyFirstActivity and open it.

That's how you build and run your Android app on the emulator!

Run on a Real Device

---

If you have a real Android-powered device, here's how you can install and run your app:

1. Plug in your device to your development machine with a USB cable. If you’re developing on Windows, you might need to install the appropriate USB driver for your device. For help installing drivers, see the OEM USB Drivers document.
2. Ensure that USB debugging is enabled in the device Settings (open Settings and navitage to Applications > Development on most devices, or click Developer options on Android 4.0 and higher).

To run the app from Eclipse, open one of your project's files and click Run  from the toolbar. Eclipse installs the app on your connected device and starts it.

Or to run your app from a command line:

1. Change directories to the root of your Android project and execute:

   ant debug

2. Make sure the Android SDK platform-tools/ directory is included in your PATH environment variable, then execute:

   adb install bin/MyFirstApp-debug.apk

3. On your device, locate MyFirstActivity and open it.

That's how you build and run your Android app on a device!

 

The next lesson will be how to start development for android

the  lessons  from  Android and if you  want to ask anything just leave a comment and i will reply isA

 

1- Android Pre-course Exercise

1 -  First we will speak about how to set-up your  Environment for Android

 

Objectives of the exercise :

You can't develop for a platform if you aren't a user to it first.

Objectives of this exercise are get familiar with android OS and android phones. 

What we will do is to install the android SDK and start using the android emulator for some

time. After getting familiar with the emulator,

second part of the exercise is to  >>

 install some applications and use them on the emulator to know how android users use their phones and what they expect to find.

If you already have an android phone or tablet

 (or any other android device, you don't need to do this exercise).

Download Android SDK:

1. Go to

http://developer.android.com/sdk/index.html, 
download the SDK suitable for your platform, and extract it in a folder of your choice. Make sure that   “<androidsdk>/tools”   is in your PATH environment variable.

Note: In case you used the windows installer, your <android-sdk> dir should be

“C:\Program Files\Android\android-sdk”

2. Start the android SDK manager by running the batch file (or shell scrip on linux/mac)

<android-sdk>/tools/android

 

 

3. Go to “Available packages” on left and open “Android Repository” to install an SDK

(for example Android 2.1 API 7)  

 

Accept license and install.
Note: Optionally explore and install other packages or SDKs

4. Create an AVD (Android Virtual Device)
From left menu, select “Virtual Devices” and from right buttons list, press “New” 

Choose a name, select a target SDK (API level), optionally create an SD card, select a
skin (HVGA is suitable resolution for an emulator running on a laptop) and finally, press
“Create AVD”

5. Create another AVD with different parameters.

6. Select one of them and press “Start” from the right buttons menu. Android emulator
will start. 

➢ Notice the title of window of emulator. Starts with 5554, this is the phone
number of the emulator.

 

➢ Navigate through buttons of emulator and try some of installed
applications. (Spend at least 15 minutes (preferably 1 hour) exploring the
emulator).

➢ Start another emulator (may be with a different AVD) and notice its phone
number (it should be 5556).

➢ Make calls and missed calls between the 2 emulators.

➢ Send SMSes between them.

➢ Store contacts.

7. Use CTRL+F11 or CTRL+F12 to change phone from portrait to landscape and vice versa and see
how this affect applications.

and HaVe A NiCe TiMe  :) :)