AutoCompleteTextView Tutorial

here is the layout xml file:

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android:id="@+id/AndroidBooks"                         android:layout_width="fill_parent"                         android:layout_height="wrap_content" >

Nothing special. It just consists of one element.

Now in the main activity, I create an array of android books:

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String[] androidBooks =            {            "Hello, Android - Ed Burnette",            "Professional Android 2 App Dev - Reto Meier",            "Unlocking Android - Frank Ableson",            "Android App Development - Blake Meike",            "Pro Android 2 - Dave MacLean",            "Beginning Android 2 - Mark Murphy",            "Android Programming Tutorials - Mark Murphy",            "Android Wireless App Development - Lauren Darcey",            "Pro Android Games - Vladimir Silva",            };

Then in the onCreate(..) method, I create an ArrayAdapter that I can pass to thisAutoCompleteTextView as the data Source.

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1	ArrayAdapter adapter = new ArrayAdapter(this,android.R.layout.simple_dropdown_item_1line,androidBooks);

Then, I get a handle to the AutocompleteTextView, and set the arrayAdapter to it along with the Threshold. The Threshold defines the number of charaters a user should type before the suggestions start showing up.

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AutoCompleteTextView acTextView = (AutoCompleteTextView)findViewById(R.id.acTVCountry);            acTextView.setThreshold(3);            acTextView.setAdapter(adapter);

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That is it. Now execute and see it work. 

This is the way it would look: