Primero codificamos el XML:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".MainActivity"
android:orientation="vertical">
<NumberPicker
android:id="@+id/numberpicker"
android:layout_width="wrap_content"
android:layout_height="wrap_content"></NumberPicker>
<TextView
android:id="@+id/texto"
android:layout_margin="10dp"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Number Picker"
android:layout_toRightOf="@id/numberpicker" />
</RelativeLayout>
Y el archivo java seria: MainActivity.java
package com.example.numberpicker;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.NumberPicker;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
private NumberPicker numberPicker;
private TextView texto;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
texto=(TextView)findViewById(R.id.texto);
numberPicker=(NumberPicker)findViewById(R.id.numberpicker);
numberPicker.setMinValue(1);
numberPicker.setMaxValue(31);
numberPicker.setOnValueChangedListener(new NumberPicker.OnValueChangeListener() {
@Override
public void onValueChange(NumberPicker numberPicker, int i, int i1) {
texto.setText("Valor anterior: "+i+" Valor Nuevo: "+i1);
}
});
}
}
Y el resultado seria el siguiente:
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