RadioButton RadioGroup Java Android example

/* Copyright (C) 2011 The Android Open Source Project
//www.apache.org/licenses/LICENSE-2.0
*/
public class MainActivity extends Activity {
private ImageView imageView;
private Button button1;
Drawable bitmapOrg;
private final int[] mColors =
{Color.BLUE, Color.GREEN, Color.RED, Color.LTGRAY, Color.MAGENTA, Color.CYAN,
		Color.YELLOW, Color.WHITE};
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);
		imageView = (ImageView)findViewById(R.id.imageView1);
		button1 = (Button)findViewById(R.id.button1);

		
		bitmapOrg = this.getResources().getDrawable(R.drawable.flower_blue);
        
        button1.setOnClickListener(new OnClickListener() {
            public void onClick(View view) {
                int mColor = (int) Math.floor(Math.random() * mColors.length);
                bitmapOrg.setColorFilter(mColors[mColor], PorterDuff.Mode.MULTIPLY);
                imageView.setImageDrawable(bitmapOrg);
                imageView.invalidate();
            }
        });	
 	}

}

public boolean isConnected() {
	 try {
		ConnectivityManager cm = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
		 return cm.getActiveNetworkInfo().isConnectedOrConnecting();
	} catch (Exception e) {
		// TODO Auto-generated catch block
		e.printStackTrace();
		Log.e("isConnected", e.getMessage());
		Toast.makeText(getApplicationContext(), e.getMessage(),
				Toast.LENGTH_LONG).show();
		return false;
	}

public class Main extends Activity {
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        
        try {
        setContentView(R.layout.main);
        
			ListView mlistView = (ListView) findViewById(R.id.idListView);
			mlistView.setAdapter(new ArrayAdapter<String>(this,
			        android.R.layout.simple_list_item_1, 
			        new String[] {"Game", "Help", "Home site"}));
    
        mlistView.setOnItemClickListener(new OnItemClickListener() {
            public void onItemClick(AdapterView<?> parent, View view,
                int position, long id) {
              // When clicked, show a toast with the TextView text Game, Help, Home
              Toast.makeText(getApplicationContext(), ((TextView) view).getText(),
                  Toast.LENGTH_SHORT).show();
              String sText = ((TextView) view).getText().toString();
              Intent intent = null;
              if(sText.equals("Game"))
              intent = new Intent(getBaseContext(),
						Game.class);
              //else if(sText.equals("Help")) ..........

              if(intent != null)
				startActivity(intent);              
            }
          });
        } catch (Exception e) {
        	// TODO Auto-generated catch block
        	e.printStackTrace();
        }
    
    }
}

        <activity android:name=".Game" android:label="GameLabel">
        </activity>

package cz.okhelp.listview;

import android.app.Activity;
import android.os.Bundle;

public class Game extends Activity{
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        
        // you have to create game.xml 
        setContentView(R.layout.game);
    }
}

 <TextView
        android:id="@+id/first_element_id"
        .........
 />
    <TextView
        android:id="@+id/second_element_id"
        android:layout_below="@id/first_element_id"
        ..........
 />