title: Handle multiple button click listeners
body: <p>I've two ImageButtons in my layout, "plus" and "minus". 
  I attach a click listener to the "plus" button with a simple toast message in the click function, and it works.</p>
  
  <pre><code>    ImageButton btplus = (ImageButton)findViewById(R.id.btplus);        
      btplus.setOnClickListener( new ImageButton.OnClickListener(){
          @Override
          public void onClick(View v) {
              Toast.makeText(getApplicationContext(), "+", Toast.LENGTH_SHORT);
          }
      });
  </code></pre>
  
  <p>Then i attach a second click listener to the minus ImageButton...</p>
  
  <pre><code>    ImageButton btminus = (ImageButton)findViewById(R.id.btminus);
      btminus.setOnClickListener( new ImageButton.OnClickListener(){
          @Override
          public void onClick(View v) {
              Toast.makeText(getApplicationContext(), "-", Toast.LENGTH_SHORT);
          }
      });
  </code></pre>
  
  <p>...and no more button click works! The "plus" click too stop working.</p>
  
  <p>I've seen a lot of examples on this theme, but i can't see any difference between them (working) and mine.</p>