DataBindingSampleModel

package com.example.joao.berrantinho.model;

import android.databinding.Bindable;
import android.databinding.BindingAdapter;
import android.databinding.InverseBindingAdapter;
import android.databinding.Observable;
import android.databinding.PropertyChangeRegistry;
import android.widget.EditText;

import com.example.joao.berrantinho.BR;

import java.util.Locale;

/**
 * Created by Joao Carlos on 12/11/17.
 * Biox Pecuaria Moderna
 * [email protected]
 */


public class SampleModel implements Observable {
    private PropertyChangeRegistry pcr = new PropertyChangeRegistry();

    private String sampleText;
    private Double numberOne;
    private Double numberTwo;

    public SampleModel(String text) {
        this.sampleText = text;
        this.numberOne = 0d;
        this.numberTwo = 0d;
    }

    @Bindable
    public String getSampleText() {
        return sampleText;
    }

    public void setSampleText(String sampleText) {
        this.sampleText = sampleText;
        pcr.notifyChange(this, BR.sampleText);
    }

    @Bindable
    public Double getNumberOne() {
        return numberOne;
    }

    public void setNumberOne(Double numberOne) {
        this.numberOne = numberOne;
        pcr.notifyChange(this, BR.numberOne);
    }

    @Bindable
    public Double getNumberTwo() {
        return numberTwo;
    }

    public void setNumberTwo(Double numberTwo) {
        this.numberTwo = numberTwo;
        pcr.notifyChange(this, BR.numberTwo);
    }

    public String sum() {
        Double s = numberOne + numberTwo;
        return s.toString();
    }

    @Override
    public void addOnPropertyChangedCallback(OnPropertyChangedCallback callback) {
        pcr.add(callback);
    }

    @Override
    public void removeOnPropertyChangedCallback(OnPropertyChangedCallback callback) {
        pcr.remove(callback);
    }

    @BindingAdapter({"android:text"})
    public static void setText(EditText editText, Double value) {
        final CharSequence oldText = editText.getText();
        if (!haveContentsChanged(value, oldText))
            return;
        editText.setText(String.format(Locale.getDefault(), "%.2f", value));
    }

    @InverseBindingAdapter(attribute = "android:text")
    public static Double getTextString(EditText editText) {
        String txt = editText.getText().toString();
        return "".equals(txt) ? 0d : Double.parseDouble(txt.replace(",", "."));
    }

    private static boolean haveContentsChanged(Double value, CharSequence oldText) {
        String oldContent = oldText.toString();
        Double oldDouble = "".equals(oldContent) ? 0d : Double.parseDouble(oldContent);
        return !oldDouble.equals(value);
    }
}