Android startup tutorial for developers video

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);
    }
}

// on bottom of onCreate add listener
mInterstitialAd .setAdListener(new AdListener(){
     public void onAdLoaded(){
          interstitial.show();
     }
});

} // end onCreate

 public void displayInterstitial (){
        if (mInterstitialAd.isLoaded()) {
            mInterstitialAd.show();
        }
    }

public void updateList() {
		Context ctx = getActivity();
		Notes notes = new Notes(ctx);

		String[] from = { Notes.COLUMN_TITLE };
		int[] to = { android.R.id.text1 };
		int layout = Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB ?
				android.R.layout.simple_list_item_activated_1 : android.R.layout.simple_list_item_1;
		ListAdapter adapter = new SimpleCursorAdapter(ctx,
				layout, notes.getNotes(), from,
				to, 0);

		setListAdapter(adapter);

		notes.close();
	}

/..................
@Override
    public void onListItemClick(ListView l, View v, int position, long id) {
        
        // Set the item as checked to be highlighted when in two-pane layout
        getListView().setChoiceMode(ListView.CHOICE_MODE_SINGLE);
        getListView().setItemChecked(position, true);
     
    }

Context context = thisClass.this;
Drawable image = ImageOperations(context,
"//www.okhelp.cz/images/android/ad_4.png"
,"image.jpg");
ImageView imgView;
imgView = (ImageView)findViewById(R.id.idImageView);
imgView.setImageDrawable(image);

	private Drawable ImageOperations(Context ctx, String url, String saveFilename) {
		try {
			InputStream is = (InputStream) this.fetch(url);
			Drawable d = Drawable.createFromStream(is, "src");
			return d;
		} catch (MalformedURLException e) {
			e.printStackTrace();
			return null;
		} catch (IOException e) {
			e.printStackTrace();
			return null;
		}
	}

	public Object fetch(String address) throws MalformedURLException,IOException {
		URL url = new URL(address);
		Object content = url.getContent();
		return content;
	}