FCs aber Eclipse meldet keinen Fehler

        final ImageButton button = (ImageButton) findViewById(R.id.android_button);

package com.example.forms;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ImageButton;
import com.example.forms.R;

public class Forms extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        final ImageButton button = (ImageButton) findViewById(R.id.android_button);
        button.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                
            }
        });
        
    }
}

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<ImageButton
    android:id="@+id/android_button"
    android:layout_width="100dip"
    android:layout_height="wrap_content"
    android:src="@drawable/android" /> 
<Android_Button
    android:id="@+id/android_button"
    android:layout_width="100dip"
    android:layout_height="wrap_content"
    android:src="@drawable/android" /> 
<EditText
    android:id="@+id/edittext"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"/>
<TextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello"
    />
</LinearLayout>

            }
        });
        
    }
}

<Android_Button
    android:id="@+id/android_button"
    android:layout_width="100dip"
    android:layout_height="wrap_content"
    android:src="@drawable/android" />

button.setOnClickListener(new OnClickListener() [B]{ 
            @Override
            public void onClick(View v) {
                // TODO Auto-generated method stub
                
            }
        }[/B]);

        final EditText edittext = (EditText) findViewById(R.id.edittext);
        edittext.setOnKeyListener(new OnKeyListener() {
            public boolean onKey(View v, int keyCode, KeyEvent event) {
                if ((event.getAction() == KeyEvent.ACTION_DOWN) && (keyCode == KeyEvent.KEYCODE_ENTER)) {
                  // Perform action on key press
                  Toast.makeText(Forms.this, edittext.getText(), Toast.LENGTH_SHORT).show();
                  return true;
                }
                return false;
            }

            @Override
            public boolean onKey(DialogInterface dialog, int keyCode,
                    KeyEvent event) {
                // TODO Auto-generated method stub
                return false;
            }
        });