tag should specify a target API level Warning

<RadioButton android:id="idRadio"
                android:text="My radio button"/>

<RadioButton android:id="@+id/idRadio"
                android:text="My radio button"/>

package cz.okhelp.surfview;

import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.Canvas;
import android.view.Menu;
import android.view.MotionEvent;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.view.View.OnTouchListener;

public class MainActivity extends Activity implements OnTouchListener {
	OurView v;
	Bitmap ball, blob;
	float x, y;
	Sprite sprite;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		// setContentView(R.layout.activity_our_view);
		v = new OurView(this);
		v.setOnTouchListener(this);
		ball = BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher);
		x = y = 0;
		setContentView(v);
	}


	@Override
	protected void onPause() {
		// TODO Auto-generated method stub
		super.onPause();
		v.pause();
	}

	@Override
	protected void onResume() {
		// TODO Auto-generated method stub
		super.onResume();
		v.resume();
	}

	public class OurView extends SurfaceView implements Runnable {
		Thread t = null;
		SurfaceHolder holder;
		boolean isItOK = false;

		public OurView(Context context) {
			super(context);
			// TODO Auto-generated constructor stub
			holder = getHolder();
		}

		public void run() {
			// TODO Auto-generated method stub
			while (isItOK == true) {
				// perform canvas drawing
				if (!holder.getSurface().isValid()) {
					continue;
				}
				// sprite = new Sprite(OurView.this,blob);
				Canvas c = holder.lockCanvas();
				c.drawARGB(255, 100, 100, 10);
				c.drawBitmap(ball, x, y, null);
				// onDraw(c);
				holder.unlockCanvasAndPost(c);
			}
		}

		protected void onDraw(Canvas canvas) {
			// sprite.onDraw(canvas);
		}

		public void pause() {
			isItOK = false;
			while (true) {
				try {
					t.join();
				} catch (InterruptedException e) {
					// TODO: handle exception
					e.printStackTrace();
				}
				break;
			}// end while
		}

		public void resume() {
			isItOK = true;
			t = new Thread(this);
			t.start();
		}
	}

	@Override
	public boolean onTouch(View v, MotionEvent event) {
		// TODO Auto-generated method stub
		try {
			Thread.sleep(50);
		} catch (InterruptedException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		switch (event.getAction()) {
		case MotionEvent.ACTION_DOWN:
			x = event.getX();
			y = event.getY();

			break;
		case MotionEvent.ACTION_UP:
			x = event.getX();
			y = event.getY();

			break;
		case MotionEvent.ACTION_MOVE:
			x = event.getX();
			y = event.getY();

			break;
		}// end switch

		return true;
	}

}

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!
*/

      Spinner  _spin1 = (Spinner) findViewById(R.id.spinLangFirst);
      ArrayAdapter<String> adapterJazyky = new ArrayAdapter<String>(this,
              R.layout.spinner_text_layout.xml, {"one","two","etc...."});
      adapterJazyky.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
      _spin1.setAdapter(adapterJazyky);

<?xml version="1.0" encoding="utf-8"?>
<TextView xmlns:android="//schemas.android.com/apk/res/android"
          android:id="@+id/spinnerText"
          android:layout_width="fill_parent"
          android:layout_height="wrap_content"
         
         android:textSize="20sp"
/>