Simple auto-complete input text.

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintLeft_toLeftOf="parent"
        app:layout_constraintRight_toRightOf="parent"
        app:layout_constraintTop_toTopOf="parent" />

    <AutoCompleteTextView
        android:id="@+id/countries_list"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

</android.support.constraint.ConstraintLayout>

MainActivity.java

package com.android.myapplication;

import android.content.res.Resources;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;

import java.util.Locale;

public class MainActivity extends AppCompatActivity {

    protected void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        setContentView(R.layout.activity_main);

        String locale = Resources.getSystem().getConfiguration().locale.getLanguage();
        Log.v("Language: ", locale);

        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_dropdown_item_1line, EVENTS);

        AutoCompleteTextView textView = findViewById(R.id.countries_list);
        textView.setAdapter(adapter);
    }


    private static final String[] EVENTS = new String[] {
            "Salto em Altura", "Salto com Vara", "Salto em Distância", "Salto Triplo", "100m", "200m", "400m", "10000m", "110m com barreiras"
    };


}