How to resolve the error "com.android.internal.R cannot be resolved" when I using the android file 'MultiAutoCompleteTextView.java',

I want to implement my own Tokenizer base on the file "MultiAutoCompleteTextView.java",

but I encounter an error "com.android.internal.R cannot be resolved" when I try to

import "MultiAutoCompleteTextView.java" to my project.

code:

public class MultiAutoCompleteTextView extends AutoCompleteTextView {
    private Tokenizer mTokenizer;

    public MultiAutoCompleteTextView(Context context) {
        this(context, null);
    }

    public MultiAutoCompleteTextView(Context context, AttributeSet attrs) {
        this(context, attrs, com.android.internal.R.attr.autoCompleteTextViewStyle);
    }

    public MultiAutoCompleteTextView(Context context, AttributeSet attrs, int defStyle)     {
        super(context, attrs, defStyle);
    }
    .
    .
    .
}

I haven't research any solutions to resolve this problem.How to correct "com.android.internal.R.attr.autoCompleteTextViewStyle" my own attr?

Thank you for any suggestions.