android how an EditText work as AutoComplete

I use this code:

1) On AndroidManifest.xml

<uses-permission android:name="android.permission.GET_ACCOUNTS"></uses-permission>

2) On xml layout you must use AutoCompleteTextView instead of EditText.

<AutoCompleteTextView
    android:id="@+id/autoCompleteTextView1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:ems="10"
    android:text="AutoCompleteTextView" />

3) Use this on Activity file

private ArrayAdapter<String> getEmailAddressAdapter(Context context) {
    Account[] accounts = AccountManager.get(context).getAccounts();
    String[] addresses = new String[accounts.length];
    for (int i = 0; i < accounts.length; i++) { 
        addresses[i] = accounts[i].name;
    }
    return new ArrayAdapter<String>(context, android.R.layout.simple_dropdown_item_1line, addresses);
}

4) On onCreate activity:

AutoCompleteTextView autoCompleteTextView1 = (AutoCompleteTextView) findViewById(R.id.autoCompleteTextView1);
autoCompleteTextView1.setAdapter(getEmailAddressAdapter(this));

First convert your EditText->AutoCompleteTextView

Then link your XML file to the AutoCompleteTextView using a ArrayAdapter

Assume that the XML string-array you created is named as list_of_countries then it can be linked to your AutoCompleteTextView as follows:

String[] countries = getResources().getStringArray(R.array.list_of_countries);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,countries);
actv.setAdapter(adapter);

Just use an AutoCompleteTextView instead of normal EditText.

hello-autocomplete will be helpful.

EDIT: The above link looks like has expired. The new page is here: https://developer.android.com/training/keyboard-input/style#AutoComplete