package com.example;

import android.app.Activity;
import android.os.Bundle;
import android.widget.*;
import android.view.*;

public class main extends Activity implements View.OnClickListener {
    /** Called when the activity is first created. */
    ImageButton btn;
 @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        btn=(ImageButton)findViewById(R.id.Image);
        btn.setOnClickListener(this);       
   
       
 }
    public void onClick(View view){
     if(btn.getDrawable().equals(getResources().getDrawable(R.drawable.a)))
     btn.setImageResource(R.drawable.b);     
     else
        btn.setImageResource(R.drawable.a);
    
   btn.invalidate();  <-- 이렇게 추가도 했는데 안되네여 ㅠㅠ   
}
}

빨간 부분이 잘못된듯한데요 아시는분 없으신가요?^^;;