Android: como criar botão na visualização candidata no teclado programável?

Eu quero fazer o candidatoView botão interno, mas

você vê o log cat:

por favor, compartilhe o código

My CodeSoftKeyboard.java

@Override
    public View onCreateCandidatesView() {
        LayoutInflater li = (LayoutInflater) getApplicationContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View wordBar = li.inflate(R.layout.wordbar, null);
        LinearLayout ll = (LinearLayout) wordBar.findViewById(R.id.words);
        Button btn = (Button) wordBar.findViewById(R.id.button1);
        btn.setOnClickListener(this);
        mCandidateView = new CandidateView(this);
        mCandidateView.setService(this);
        setCandidatesViewShown(true);
        mCandidateView.setLayoutParams(new LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));
        ll.addView(mCandidateView);
        return wordBar;
    }

Eu quero fazer assim:

Layout wordBar.xml

    <?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/words"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal" >

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Button" />
</LinearLayout>

Agradecemos antecipadamente

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