Android Application Development Cookbook: 93 Recipes for Building Winning Apps

56
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ChAPter 2
using Views to design the user interFAce
The following code snippet shows how to use the 
AutoCompleteTextView
: 
package net.learn2develop.autocomplete;
import android.app.Activity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;
public class MainActivity 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"
};
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ArrayAdapter adapter = new ArrayAdapter(this,
android.R.layout.simple_dropdown_item_1line, presidents);
AutoCompleteTextView textView = (AutoCompleteTextView) 
findViewById(R.id.txtCountries);
textView.setThreshold(3);
textView.setAdapter(adapter);
}
}
You first created an array containing a list of presidents’ names. You then created an 
ArrayAdapter
object, specifying how you want to display the list of names, as well as the array containing the 
names. 
You set the 
AutoCompleteTextView
’s threshold to 
3
so that the suggestions will appear only after 
the user has typed at least three characters. You then need to set the 
AutoCompleteTextView
to use 
the array adapter you have just created. 
Figure 2-10 shows the suggestions displayed in a list as the user types the characters “joh” into the 
AutoCompleteTextView
.
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