Using AutoCompleteTextView

    
package app.test;

import android.app.Activity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;

public class Test extends Activity {
   String[] presidents = 
      {
 "Dwight D. Eisenhower",
              "John F. Kennedy",
              "Lyndon B. Johnson",
              "Richard Nixon",
              "Gerald Ford",
              "Jimmy Carter",
              "Ronald Reagan",
              "George H. W. Bush",
              "Bill Clinton",
              "George W. Bush",
              "Barack Obama"
      };
   
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
                android.R.layout.simple_dropdown_item_1line, presidents);
     
        AutoCompleteTextView textView = (AutoCompleteTextView)
                findViewById(R.id.txtCountries);
        
        textView.setThreshold(3);
        textView.setAdapter(adapter);      
    }
}

//main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >
<TextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="Name of President" />
    
<AutoCompleteTextView android:id="@+id/txtCountries"
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content" />
           
</LinearLayout>

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Using AutoCompleteTextView : TextView « UI « Android

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