TextWatcherUtils.java

import android.databinding.BindingAdapter;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.View;
import android.widget.TextView;

/**
 * These codes are licensed under CC0.
 * <p/>
 * Created by cattaka on 2016/10/18.
 */
public class TextWatcherUtils {
    private View view;

    @BindingAdapter("applyTextWatcher")
    public static void applyTextWatcher(final TextView textView, final ITextWatcherListener listener) {
        textView.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {
                listener.beforeTextChanged(textView, charSequence, i, i1, i2);
            }

            @Override
            public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {
                listener.onTextChanged(textView, charSequence, i, i1, i2);
            }

            @Override
            public void afterTextChanged(Editable editable) {
                listener.afterTextChanged(textView, editable);
            }
        });
    }

    public interface ITextWatcherListener {
        void beforeTextChanged(TextView view, CharSequence charSequence, int i, int i1, int i2);

        void onTextChanged(TextView view, CharSequence charSequence, int i, int i1, int i2);

        void afterTextChanged(TextView view, Editable editable);
    }
}