Android - Auto Complete

If you want to get suggestions , when you type in an editable text field , you can do this via AutoCompleteTextView. It provides suggestions automatically when 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.
In order to use AutoCompleteTextView you have to first create an AutoCompletTextView Field in the xml. Its syntax is given below.
<AutoCompleteTextView
   android:id="@+id/autoCompleteTextView1"
   android:layout_width="wrap_content"
   android:layout_height="wrap_content"
   android:layout_alignParentTop="true"
   android:layout_centerHorizontal="true"
   android:layout_marginTop="65dp"
   android:ems="10" >
After that, you have to get a reference of this textview in java. Its syntax is given below.
private AutoCompleteTextView actv;
actv = (AutoCompleteTextView) findViewById(R.id.autoCompleteTextView1); 
The the next thing you need to do is to specify the list of suggestions items to be displayed. You can specify the list items as a string array in java or in strings.xml. Its syntax is given below.
String[] countries = getResources().getStringArray(R.array.list_of_countries);
ArrayAdapter<String> adapter = new ArrayAdapter<String>
   (this,android.R.layout.simple_list_item_1,countries);
actv.setAdapter(adapter);
The array adapter class is responsible for displaying the data as list in the suggestion box of the text field. The setAdapter method is used to set the adapter of the autoCompleteTextView. Apart from these methods, the other methods of Auto Complete are listed below.
getAdapter()
This method returns a filterable list adapter used for auto completion
getCompletionHint()
This method returns optional hint text displayed at the bottom of the the matching list
getDropDownAnchor()
This method returns returns the id for the view that the auto-complete drop down list is anchored to.
getListSelection()
This method returns the position of the dropdown view selection, if there is one
isPopupShowing()
This method indicates whether the popup menu is showing
setText(CharSequence text, boolean filter)
This method sets text except that it can disable filtering
showDropDown()
This method displays the drop down on screen.
The below example demonstrates the use of AutoCompleteTextView class. It crates a basic application that allows you to type in and it displays suggestions on your device.
To experiment with this example , you need to run this on an actual device or in an emulator.
Here is the content of src/MainActivity.java
package com.example.sairamkrishna.myapplication;

import android.app.Activity;
import android.content.Context;

import android.media.AudioManager;
import android.media.MediaPlayer;
import android.media.MediaRecorder;

import android.os.Bundle;
import android.os.Environment;

import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.animation.Animation;
import android.view.animation.AnimationUtils;

import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.MultiAutoCompleteTextView;
import android.widget.Toast;
import java.io.IOException;


public class MainActivity extends Activity {
   AutoCompleteTextView text;
   MultiAutoCompleteTextView text1;
   String[] languages={"Android ","java","IOS","SQL","JDBC","Web services"};
   
   @Override
   protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      
      text=(AutoCompleteTextView)findViewById(R.id.autoCompleteTextView1);
      text1=(MultiAutoCompleteTextView)findViewById(R.id.multiAutoCompleteTextView1);
      
      ArrayAdapter adapter = new 
         ArrayAdapter(this,android.R.layout.simple_list_item_1,languages);
      
      text.setAdapter(adapter);
      text.setThreshold(1);
      
      text1.setAdapter(adapter);
      text1.setTokenizer(new MultiAutoCompleteTextView.CommaTokenizer());
   }
}
Here is the content of activity_main.xml
<xml version="1.0" encoding="utf-8"?>
<RelativeLayout 
   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">
   
   <TextView
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="Android Auto Complete"
      android:id="@+id/textView"
      android:textSize="30dp"
      android:layout_alignParentTop="true"
      android:layout_alignParentRight="true"
      android:layout_alignParentEnd="true" />
      
   <TextView
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:text="Tutorialspoint"
      android:id="@+id/textView2"
      android:textColor="#ff3eff0f"
      android:textSize="35dp"
      android:layout_below="@+id/textView"
      android:layout_centerHorizontal="true" />
      
   <ImageView
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:id="@+id/imageView"
      android:src="@drawable/logo"
      android:layout_below="@+id/textView2"
      android:layout_alignLeft="@+id/textView2"
      android:layout_alignStart="@+id/textView2"
      android:layout_alignRight="@+id/textView2"
      android:layout_alignEnd="@+id/textView2" />
      
   <AutoCompleteTextView
      android:id="@+id/autoCompleteTextView1"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:ems="10"
      android:layout_below="@+id/imageView"
      android:layout_alignLeft="@+id/imageView"
      android:layout_alignStart="@+id/imageView"
      android:layout_marginTop="72dp"
      android:hint="AutoComplete TextView">
      <requestFocus />
   </AutoCompleteTextView>
   
   <MultiAutoCompleteTextView
      android:id="@+id/multiAutoCompleteTextView1"
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:ems="10"
      android:layout_below="@+id/autoCompleteTextView1"
      android:layout_alignLeft="@+id/autoCompleteTextView1"
      android:layout_alignStart="@+id/autoCompleteTextView1"
      android:hint="Multi Auto Complete " />
      
</RelativeLayout>
Here is the content of Strings.xml
<resources>
   <string name="app_name">My Application</string>
</resources>
Here is the content of AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
   package="com.example.sairamkrishna.myapplication" >

   <application
      android:allowBackup="true"
      android:icon="@drawable/ic_launcher"
      android:label="@string/app_name"
      android:theme="@style/AppTheme" >
      
      <activity
         android:name="com.example.sairamkrishna.myapplication.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>
Let's try to run your  application. I assume you have connected your AVD while doing environment setup. To run the app from Android Studio, open one of your project's activity files and click Run  icon from the toolbar. Android studio will install this application in your AVD and your AVD will display following screen.
Now just type in the text view to see suggestions of the Languages. As i just type one letter which are asa, and it shows me suggestion of language.
The multiAutoCompleteTextView demonstrates suggestions for not only a word but for whole text. As after writing first word , when i start writing the second word , it displays me the suggestions. This can be shown in the picture below.

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