AutoCompleteTextView in Android

An editable text view that shows completion suggestions automatically while the user is typing. The list of suggestions is displayed in a drop down menu from which the user can choose an item to replace the content of the edit box with.

Android AutoCompleteTextView is a editable text field, it displays a list of suggestions in a drop down menu from which user can select only one suggestion or value.

activity_main.xml

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<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:orientation="vertical"
    android:layout_height="match_parent"
    tools:context=".MainActivity">


    <AutoCompleteTextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/autoCompleteTextView"
        android:hint="enter key word" />

    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Submit"
        android:id="@+id/button"
        android:layout_gravity="center_horizontal" />
</LinearLayout>

MainActivity.Java

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package com.android.anil.autocompletetextview;



import android.support.v7.app.AppCompatActivity;

import android.os.Bundle;

import android.view.View;

import android.widget.AdapterView;

import android.widget.ArrayAdapter;

import android.widget.AutoCompleteTextView;

import android.widget.Button;

import android.widget.Toast;



public class MainActivity extends AppCompatActivity {

    AutoCompleteTextView autoCompleteTextView;

    Button submitbtn;

    String selectedname;



    static final String[] COUNTRIES = new String[] { "Afghanistan", "Albania",

            "Algeria", "American Samoa", "Andorra", "Angola", "Anguilla",

            "Antarctica", "Antigua and Barbuda", "Argentina", "Armenia",

            "Aruba", "Australia", "Austria", "Azerbaijan", "Bahrain",

            "Bangladesh", "Barbados", "Belarus", "Belgium", "Belize", "Benin",

            "Bermuda", "Bhutan", "Bolivia", "Bosnia and Herzegovina",

            "Botswana", "Bouvet Island", "Brazil",

            "British Indian Ocean Territory", "British Virgin Islands",

            "Brunei", "Bulgaria", "Burkina Faso", "Burundi", "Cote d'Ivoire",

            "Cambodia", "Cameroon", "Canada", "Cape Verde", "Cayman Islands",

            "Central African Republic", "Chad", "Chile", "China",

            "Christmas Island", "Cocos (Keeling) Islands", "Colombia",

            "Comoros", "Congo", "Cook Islands", "Costa Rica", "Croatia",

            "Cuba", "Cyprus", "Czech Republic",

            "Democratic Republic of the Congo", "Denmark", "Djibouti",

            "Dominica", "Dominican Republic", "East Timor", "Ecuador", "Egypt",

            "El Salvador", "Equatorial Guinea", "Eritrea", "Estonia",

            "Ethiopia", "Faeroe Islands", "Falkland Islands", "Fiji",

            "Finland", "Former Yugoslav Republic of Macedonia", "France",

            "French Guiana", "French Polynesia", "French Southern Territories",

            "Gabon", "Georgia", "Germany", "Ghana", "Gibraltar", "Greece",

            "Greenland", "Grenada", "Guadeloupe", "Guam", "Guatemala",

            "Guinea", "Guinea-Bissau", "Guyana", "Haiti",

            "Heard Island and McDonald Islands", "Honduras", "Hong Kong",

            "Hungary", "Iceland", "India", "Indonesia", "Iran", "Iraq",

            "Ireland", "Israel", "Italy", "Jamaica", "Japan", "Jordan",

            "Kazakhstan", "Kenya", "Kiribati", "Kuwait", "Kyrgyzstan", "Laos",

            "Latvia", "Lebanon", "Lesotho", "Liberia", "Libya",

            "Liechtenstein", "Lithuania", "Luxembourg", "Macau", "Madagascar",

            "Malawi", "Malaysia", "Maldives", "Mali", "Malta",

            "Marshall Islands", "Martinique", "Mauritania", "Mauritius",

            "Mayotte", "Mexico", "Micronesia", "Moldova", "Monaco", "Mongolia",

            "Montserrat", "Morocco", "Mozambique", "Myanmar", "Namibia",

            "Nauru", "Nepal", "Netherlands", "Netherlands Antilles",

            "New Caledonia", "New Zealand", "Nicaragua", "Niger", "Nigeria",

            "Niue", "Norfolk Island", "North Korea", "Northern Marianas",

            "Norway", "Oman", "Pakistan", "Palau", "Panama",

            "Papua New Guinea", "Paraguay", "Peru", "Philippines",

            "Pitcairn Islands", "Poland", "Portugal", "Puerto Rico", "Qatar",

            "Reunion", "Romania", "Russia", "Rwanda", "Sqo Tome and Principe",

            "Saint Helena", "Saint Kitts and Nevis", "Saint Lucia",

            "Saint Pierre and Miquelon", "Saint Vincent and the Grenadines",

            "Samoa", "San Marino", "Saudi Arabia", "Senegal", "Seychelles",

            "Sierra Leone", "Singapore", "Slovakia", "Slovenia",

            "Solomon Islands", "Somalia", "South Africa",

            "South Georgia and the South Sandwich Islands", "South Korea",

            "Spain", "Sri Lanka", "Sudan", "Suriname",

            "Svalbard and Jan Mayen", "Swaziland", "Sweden", "Switzerland",

            "Syria", "Taiwan", "Tajikistan", "Tanzania", "Thailand",

            "The Bahamas", "The Gambia", "Togo", "Tokelau", "Tonga",

            "Trinidad and Tobago", "Tunisia", "Turkey", "Turkmenistan",

            "Turks and Caicos Islands", "Tuvalu", "Virgin Islands", "Uganda",

            "Ukraine", "United Arab Emirates", "United Kingdom",

            "United States", "United States Minor Outlying Islands", "Uruguay",

            "Uzbekistan", "Vanuatu", "Vatican City", "Venezuela", "Vietnam",

            "Wallis and Futuna", "Western Sahara", "Yemen", "Yugoslavia",

            "Zambia", "Zimbabwe" };



    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        autoCompleteTextView=(AutoCompleteTextView)findViewById(R.id.autoCompleteTextView);

        submitbtn=(Button)findViewById(R.id.button);

        ArrayAdapter<String> arrayAdapter=new ArrayAdapter<String>(MainActivity.this,android.R.layout.simple_dropdown_item_1line,COUNTRIES);

        autoCompleteTextView.setThreshold(0);

        autoCompleteTextView.setAdapter(arrayAdapter);

        autoCompleteTextView.setOnItemClickListener(new AdapterView.OnItemClickListener() {

            @Override

            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

                selectedname = (String) parent.getItemAtPosition(position);

            }

        });

        submitbtn.setOnClickListener(new View.OnClickListener() {

            @Override

            public void onClick(View v) {

                Toast.makeText(MainActivity.this, "Selected Country is : "+selectedname, Toast.LENGTH_SHORT).show();            }

        });

    }



}

Output is:

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