AutoCompleteTextView View android exam code

The AutoCompleteTextView view is a view that is similar to the EditText view (in fact it is a subclass of the EditText view), except that it shows a list of completion suggestions automatically while the user is typing.
Add a new file to the res/layout folder and name it as autocomplete.xml and populate it with the following elements:

<?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"
    >
    <AutoCompleteTextView android:id="@+id/txtCountries"
        android:layout_width="fill_parent" 
        android:layout_height="wrap_content"
        />                   
</LinearLayout>

Add a new file to the src/net.learn2develop.AndroidViews folder and name it as AutoCompleteExample.java. Populate it as follows:

package net.learn2develop.AndroidViews;
 
import android.app.Activity;
import android.os.Bundle;
import android.widget.ArrayAdapter;
import android.widget.AutoCompleteTextView;
 
public class AutoCompleteExample 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.autocomplete);
 
        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);         
    }
}

Note that the list of suggestions is obtained from an ArrayAdapter object. The setThreshold() method sets the number of minimum number of characters the user must type before the suggestions appear as a drop-down menu.
Add the following lines in bold to the AndroidManifest.xml file to register the new AutoCompleteExample activity:

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="net.learn2develop.AndroidViews"
      android:versionCode="1"
      android:versionName="1.0.0">
    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".ViewsActivity"
                  android:label="@string/app_name">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
 
        <activity android:name=".AutoCompleteExample"
                  android:label="@string/app_name" />
 
    </application>
</manifest>

Modify the ViewsActivity.java file to start the AutoCompleteExample activity:

package net.learn2develop.AndroidViews;
 
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
 
public class ViewsActivity extends Activity 
{
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);      
 
        startActivity(new Intent(this, AutoCompleteExample.class));
 
    }
}

Figure 7 shows the AutoCompleteTextView view in action when you enter some text into it.

Figure 6 AutoCompleteTextView in action