Using Autocomplete TextView

AutocompleteTextView is an editable text view that shows completion suggestions automatically while the user is typing. The list of suggestions is displayed in a drop down menu from which the user can choose an item to replace the content of the edit box with.

The drop down can be dismissed at any time by pressing the back key or, if no item is selected in the drop down, by pressing the enter/dpad center key.

The list of suggestions is obtained from a data adapter and appears only after a given number of characters defined by the threshold.

Create A new Project  AutocompleteTextView

Edit .xml file

open your .xml file and write foolowing  to get the following layout

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" 
    android:orientation="vertical">
    
     <TextView
        android:id="@+id/textView1"
         android:layout_marginTop="40dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="Choose The Country Name"
        android:textAppearance="?android:attr/textAppearanceMedium" />

    <AutoCompleteTextView
        android:id="@+id/autoCompleteTextView1"
         android:layout_marginTop="15dp"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:ems="10"
        android:hint="Choose The Country" >

        <requestFocus />
    </AutoCompleteTextView>

    <TextView
        android:id="@+id/textViewCountry"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="15dp"
        android:text="You Selected :"
        android:textAppearance="?android:attr/textAppearanceMedium" />

    <Button
        android:id="@+id/buttonSelectCountry"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
         android:layout_marginTop="15dp"
        android:layout_gravity="center_horizontal"
        android:text="          OK          " 
        />

</LinearLayout>

Now Edit your Activitty  file



 public void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        
       String COUNTRIES[]={"INDIA","ITALY","JAPAN","USA","ICELAND","INDONESIA","UK","IRAN","IRAQ"};
        
        
        final AutoCompleteTextView autoCompleteTextViewCountry = (AutoCompleteTextView)findViewById(R.id.autoCompleteTextView1);

        final TextView  textViewSelectedCountry=(TextView)findViewById(R.id.textViewCountry);
        Button btnSelectedCountry=(Button)findViewById(R.id.buttonSelectCountry);
        
        ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
                android.R.layout.simple_dropdown_item_1line, COUNTRIES);

      // Set the adapter
        autoCompleteTextViewCountry.setAdapter(adapter);
        autoCompleteTextViewCountry.setThreshold(1);
        
        btnSelectedCountry.setOnClickListener(new View.OnClickListener() {

public void onClick(View arg0) {
// TODO Auto-generated method stub

String country=autoCompleteTextViewCountry.getText().toString();
textViewSelectedCountry.setText("Selected Country: "+country);

}
});
        
       
    }

 
}

Point to Remember:

public void setThreshold (int threshold)

Specifies the minimum number of characters the user has to type in the edit box before the drop down list is shown.

When threshold is less than or equals 0, a threshold of 1 is applied.

Now run the project 

you get following 

Hope you like the post . Comments and Questions are welcome.