GridView + OnItemClickListener

 public ImageButtonAdapter(Context c, ArrayList<App> appList) {  
        this.mContext = c;
        this.appList = appList;        
}  

public int getCount() {  
     return this.appList.size();
}  
    
public Object getItem(int position) {  
        return this.appList.get(position);  
}  

public long getItemId(int position) {  
        return this.appList.get(position).getId();  
}  
   
 public View getView(int position,  
                              View convertView, ViewGroup parent) {  
     ImageButton btn;  
    
     if (convertView == null) {  
          // if it's not recycled, initialize some attributes  
          btn = new ImageButton(mContext);  
          btn.setLayoutParams(new GridView.LayoutParams(100, 100));  
          btn.setPadding(10, 10, 10, 10);  
     }  
     else {  
          btn = (ImageButton) convertView;  
     }  
  
     btn.setImageDrawable(this.appList.get(position).getIcon()); 
     btn.setId(this.appList.get(position).getId()); 
     return btn;  
 }

this.g = (GridView) findViewById(R.id.mainApps);
            ImageButtonAdapter adapter = new ImageButtonAdapter(this,
            App.getApps());

this.g.setOnItemClickListener(new OnItemClickListener(){
   @Override
   public void onItemClick(AdapterView<?> arg0,View arg1, int arg2, long 
                                            arg3) {  doIT(arg1)}  });                                                        
     registerForContextMenu(this.g);
     this.g.setAdapter(adapter);