AutoComplete Textview with Filter

activity_main.xml
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<?xml version="1.0" encoding="utf-8"?>

<LinearLayout 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"
    android:orientation="vertical"
    app:layout_behavior="@string/appbar_scrolling_view_behavior"
    tools:context="com.sgp.anil.samplepraticeonview.MainActivity"
    tools:showIn="@layout/activity_main">


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

MainActivity.Java

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package com.sgp.anil.samplepraticeonview;

import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.text.Editable;
import android.text.TextWatcher;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {
    AutoCompleteTextView act;
    String[] names = {"Android", "Anil", "Amazon", "Ball", "Bat", "Cat", "Cow", "Deer", "Dolphin"};
    String my_var;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
        setSupportActionBar(toolbar);
        act = (AutoCompleteTextView) findViewById(R.id.autoCompleteTextView);
        final ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(MainActivity.this, android.R.layout.simple_list_item_1, names);
        act.setThreshold(0);
        act.setAdapter(arrayAdapter);
        act.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                my_var = arrayAdapter.getItem(position);
                Toast.makeText(MainActivity.this, "Name is : " + my_var, Toast.LENGTH_SHORT).show();


                if(position==1){
                    startActivity(new Intent(getApplicationContext(),RadioGRoupActivity.class));
                }


            }
        });

        act.addTextChangedListener(new TextWatcher() {

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
                // TODO Auto-generated method stub
                if (!act.isPerformingCompletion()) {
                    boolean validator = false;
                    for (String val : names) {
                        if (val.toLowerCase().startsWith(s.toString().toLowerCase())) {
                            //  Toast.makeText(MainActivity.this, "No matches found ",  Toast.LENGTH_LONG).show();
                            validator = true;
                        }
                    }

                    if (!validator) {

                        Toast.makeText(MainActivity.this, "Search is not found", Toast.LENGTH_SHORT).show();

                    }
                }

            }

            @Override
            public void beforeTextChanged(CharSequence s, int start, int count,
                                          int after) {
                // TODO Auto-generated method stub

            }

            @Override
            public void afterTextChanged(Editable s) {
                // TODO Auto-generated method stub

            }
        });
    }
}

Output 

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