AutoCompleteTextView automatically provides suggestions based on the text entered by the user.

In this tutorial, I will show you how to work with AutoCompleteTextView.

1. Open Eclipse or  Android Studio -> New Project->Android Application Project-> Name of Application-> Follow all instructions and complete by clicking on Finish.
2. Create a layout for MainActivty.java containing AutoCompleteTextView.

So Let’s Start

activity_main.xml

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
    android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    tools:context=".MainActivity"
    android:orientation="vertical">

    <TextView
        android:layout_margin="20dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Search Countries"/>

    <AutoCompleteTextView
        android:id="@+id/autocompletetextview"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_margin="20dp"/>

</LinearLayout>

3.Create MainActivity.java and use dummy data for AutoCompleteTextView.

MainActivity.java

package com.androidruler.myautocomplete;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

    // autocomplete to search countries
    AutoCompleteTextView autocompletetextview;
    // arraylist to contain dummy data for autocompletview
    ArrayList<String> countries=new ArrayList<>();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        autocompletetextview=(AutoCompleteTextView)findViewById(R.id.autocompletetextview);
        // prepare dummy data for autocomplete view
        prepareDummyData();
        // arraydapter to set to autocompletetextview
        ArrayAdapter<String> adapter=new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,android.R.id.text1,countries);
       // bind dapter to autocompleteview
        autocompletetextview.setAdapter(adapter);

    }

    public  void prepareDummyData()
    {
        countries.add("India");
        countries.add("Usa");
        countries.add("Uk");
        countries.add("Russia");
        countries.add("Chile");
        countries.add("China");
        countries.add("Iceland");
        countries.add("Austria");
        countries.add("Australia");
        countries.add("Canada");
        countries.add("Cameroon");

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.menu_main, menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        // Handle action bar item clicks here. The action bar will
        // automatically handle clicks on the Home/Up button, so long
        // as you specify a parent activity in AndroidManifest.xml.
        int id = item.getItemId();

        //noinspection SimplifiableIfStatement
        if (id == R.id.action_settings) {
            return true;
        }

        return super.onOptionsItemSelected(item);
    }
}

AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.androidruler.myautocomplete" >

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name=".MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

Output

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