Android: Listener tanımlama

Ref: http://tseng-blog.nge-web.net/blog/2009/02/14/implementing-listeners-in-your-android-java-application/

3 Yolu var:

1. Satır içi:
   

   
   public class LoginExample extends Activity 
   {
     /** Called when the activity is first created. */
   
     @Override
     public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       ...
   
       // Set Click Listener
       btnLogin.setOnClickListener(new OnClickListener() {
         @Override
         public void onClick(View v) {
           // Check Login
         }
       });
     }
   }
   

2. "implements" kullanılarak:
   

   
   public class LoginExample extends Activity implements OnClickListener
   {
     @Override
     public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       ...
   
       // Set Click Listener
       btnLogin.setOnClickListener(this);
     }
   
     @Override
     public void OnClickListener(View v) {
   
       if(v.getId() == R.id.id_btnLogin){
   
         // Check Login
       }
   
       // --- ya da 
   
       if(v == findViewById(R.id.id_btnLogin)){
   
         // Check Login
       }
   
       // --- ya da birden fazla düğmenin onClick eventi buraya gelecek
       switch( v.getId() )
       {
         case R.id.id_btnLogin :
           //......
         break;
   
         case R.id.id_btnLogOut :
           //......
         break;
   
         ......
       }
     }
   }
   

3. Değişken gibi kullanarak:
   

   
   public class LoginExample extends Activity 
   {
       // Set Click Listener
     OnClickListener btnLoginClickListener = new OnClickListener(){
   
       @Override
       public void OnClickListener(View v) {
   
         // Check Login      
       }
     };
   
   
     @Override
     public void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       ...
       btnLogin.setOnClickListener(btnLoginClickListener);
     }
   }