Which version of eclipse for android development

public class MainActivity extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        LinearLayout layout = (LinearLayout) findViewById(R.id.layout);
            TextView textView = new TextView(this);
            textView.setText("Text View ");
            LinearLayout.LayoutParams p = new LinearLayout.LayoutParams(
                    LinearLayout.LayoutParams.FILL_PARENT,
                    LinearLayout.LayoutParams.WRAP_CONTENT
            );
            layout.addView(textView, p);

            Button buttonView = new Button(this);
            buttonView.setText("Button");
            buttonView.setOnClickListener(mThisButtonListener);
            layout.addView(buttonView, p);
        
    }
    private OnClickListener mThisButtonListener = new OnClickListener() {
        public void onClick(View v) {
            Toast.makeText(MainActivity.this, "Hello !",
                    Toast.LENGTH_LONG).show();
        }
    };
}

// error
InputStream is = context.getResources().openRawResource(R.drawable.app_sample_code);

// ok
InputStream is = context.getResources().openRawResource(+R.drawable.app_sample_code);

public class MainClass {
	public static void main(String[] arg) {
			String[] arrayOfString = { "Hello", "people", "hello", "world!" };
			int i = 0;
                        // first cycle is always executed
			do {
				System.out.println("Loop: " + i);
				System.out.println(arrayOfString[i]);
				i++;
				
			}while ( i == -1 );
	}
}
/*
Loop: 0
Hello
*/

public class MainClass {
	public static void main(String[] arg) {
			String[] arrayOfString = { "Hello", "people", "hello", "world!" };
			int i = 0;
			do {
				System.out.println("Loop: " + i);
				System.out.println(arrayOfString[i]);
				i++;
				
			}while ( i < arrayOfString.length );
	}
}
/*
Loop: 0
Hello
Loop: 1
people
Loop: 2
hello
Loop: 3
world!
*/

 Display display = getWindowManager().getDefaultDisplay();
int nWidth = display.getWidth();
int nHeight = display.getHeight();

          DisplayMetrics metrics = new DisplayMetrics();
            getWindowManager().getDefaultDisplay().getMetrics(metrics);
            //get density per inch for example: 120 , 160 , 240
            mXDpi = metrics.xdpi; // 160 The exact physical pixels per inch of the screen in the X dimension. 
            mYDpi = metrics.ydpi;

// density
int nDensity = metrics.densityDpi; // 160 screen density expressed as dots-per-inch

          float  mMetersToPixelsX = mXDpi / 0.0254f; // 1 inch == 0.0254 metre
          float  mMetersToPixelsY = mYDpi / 0.0254f;
          
// Resolution
// The total number of physical pixels on a screen.
int wPix = metrics.widthPixels; // 320 The absolute width of the display in pixels.
int hPix = metrics.heightPixels; // 480 The absolute height of the display in pixels.
int nWidthDisplay = (wPix < hPix)? wPix : hPix;

float nWidthScreenInInch = wPix / mXDpi; //320 / 160 == 2.0 in inch.
float nHeightScreenInInch = hPix / mYDpi; //480 / 160 == 3.0 in inch.

// for example:
// density 120 per inch
//width 320 pix / 120 dpi == width 2.66 inch
//height 480 pix / 120 dpi == height 4.0 inch 

// density 240 per inch
//width 320 pix / 240 dpi == width 1.33 inch
//height 480 pix / 240 dpi == height 2.0 inch