Eclipse revert old version Android Development Tools

Kvalitní mobilní telefon pro rok 2012 by měl mít tyto, nebo ještě lepší parametry.
Značka Samsung , HTC, LG, Motorola, Sony Ericsson, ZTE Blade
Verze operačního systému Android 2.2 a vyšší.
Procesor a jeho frekvence Qualcomm 800MHz a vyšší.
Paměť RAM 512MB a více.
Paměť ROM 512MB.
Displej a jeho rozlišení 4,3 palce rozlišení 480x800 pixelů pro snadné ovládání a čtení a schopnost zobrazit 16 milionů barev.
Technologie 3G data, WiFi, BlueTooth, GPS přijímač, fotoaparát 3 Mpix, autofokus, diodový blesk.
Výdrž baterie minimálně 1 den a více.
3G internet.

if , else if, else statement with string as a switch statement in Java example source code.

MainClass.java

public class MainClass {
	public static void main(String[] arg) {
		String[] arrayOfString = {"nothing", "Hello", "people"
				, "bye-bye", "hello", "world!", "end" };
		for (int i = 0; i < arrayOfString.length; i++) {
			
			if (arrayOfString[i].equals("Hello"))
				System.out.println(arrayOfString[i]);
			else if (arrayOfString[i].equals("people"))
				System.out.println(arrayOfString[i]);
			else if (arrayOfString[i].equals("hello"))
				System.out.println(arrayOfString[i]);
			else if (arrayOfString[i].equals("world!"))
				System.out.println(arrayOfString[i]);
			else // default
				System.out.println("Default");
		}
	}
}
/*
Default
Hello
people
Default
hello
world!
Default 
 */

Full Screen without titlebar and statusbar for Android Activity.
In Activity.java

public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
         requestWindowFeature(Window.FEATURE_NO_TITLE);
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
            WindowManager.LayoutParams.FLAG_FULLSCREEN);
        setContentView(R.layout.main);
    }

or in AndroidManifest.xml

<activity android:name=".ActivityName"
    android:label="@string/app_name"
    android:theme="@android:style/Theme.NoTitleBar.Fullscreen">
</activity>

Try this:
- check names of drawables (file name must contain only abc...xyz 012...789 _ . in Resources folder ,
names have to start with lower case
MyImage.jpg == problem ,
names with space
my image.jpg == problem,
names with -
my-image.png == problem)
- check duplicate names with other extension ( my_image.jpg - my_image.png makes the problem)
- restart Android Studio
- if problem persist:
- check c:\Users\me\AndroidStudioProjects\myProject\myModule\build\intermediates\res\merged\debug\ drawable folder for corupted names or delete ALL drawable folders
- synk projekt, rebuild projekt
- if problem persist:
- restart Android Studio, wait for complete closure of the Android Studio!

If You have old PC (Android in emulator with high screen resolution uses a lot of memory) or your testing phone have small screen, You can try this trick.
Rename layout folder for small device screen f.g. from layout into layout-swXXXdp and a large layout-sw600dp into layout.
Your phone with small screnn will do select xml file from renamed layout folder (for small screen).
You can to testing rotation with device en stability of fragments if an application changed orientation.
If you have old pc, you can try to make a new virtual device running on older version of Android, which uses less memory of computer.
For testing of rotation stability - application orientation changed - use on emulator Ctrl+F11, Ctrl+F12 key (Windows).

Important
Before the release of application, you have to rename layout folder to older name layout-sw600dp and layout-swXXXdp to layout.