android - How to filter results of AutoCompleteTextView?

Question

I have an AutoCompleteTextView set to use a cursor which goes over my Contacts. The problem is, I have it populating the dropdown correctly, but its not filtering the results after I type.

Here is my code for the cursor and setting of the adapter:

edt_Contact = (AutoCompleteTextView)findViewById(R.id.compose_edtContact);

cursor = getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, 
        new String[] {Phone._ID, Phone.DISPLAY_NAME, Phone.NUMBER}, 
        null,null,null);
startManagingCursor(cursor);
String[] from = new String[] { Phone.DISPLAY_NAME, Phone.NUMBER};
int[] to = new int[] { R.id.contact_name, R.id.contact_phoneNo};
adapter = new SimpleCursorAdapter(this, R.layout.simple_contact_textview, cursor, from, to);

edt_Contact.setAdapter(adapter);

And here is the xml for simple_contact_textview:

<LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:layout_width="fill_parent"
  android:layout_height="fill_parent" android:padding="5sp" android:paddingBottom="5sp" android:background="#FFFFFFFF">
    <TextView 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content" 
        android:id="@+id/contact_name" 
        android:textColor="#FF000000" 
        android:textSize="20sp" 
        android:text="Name">
    </TextView>
    <TextView 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content" 
        android:id="@+id/contact_phoneNo" 
        android:paddingLeft="10sp" 
        android:textColor="#FF000000" 
        android:textSize="20sp" 
        android:text="Number" 
        android:ellipsize="end">
    </TextView>
</LinearLayout>

How do I filter the dropdown results based on what the user is typing? For instance, if the user starts typing "and", how would I have "andrew", "andy", and "mandy" appear?

Answer 1

Construct a FilterQueryProvider and pass it into adapter.setFilterQueryProvider().

adapter.setFilterQueryProvider(new FilterQueryProvider() {
    public Cursor runQuery(CharSequence constraint) {
        String s = '%' + constraint.toString() + '%';
        return getContentResolver().query(ContactsContract.CommonDataKinds.Phone.CONTENT_URI, 
            new String[] {Phone._ID, Phone.DISPLAY_NAME, Phone.NUMBER},
            Phone.DISPLAY_NAME + ' LIKE ? OR ' + Phone.NUMBER + ' LIKE ?',
            new String[] { s, s },
            null);
    }
});

The code above will return results that match anywhere in the string (not just in the beginning. Also, since it uses parameterized queries, your users won't be able to damage the DB via a SQL injection attack.

(Not near an actual computer, so I can't test the above -- probably some syntax errors in there.)