1 /* 2 * Copyright (C) 2012 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.dialer.dialpad; 18 19 import android.telephony.PhoneNumberUtils; 20 import android.text.Spanned; 21 import android.text.method.DialerKeyListener; 22 23 /** 24 * {@link DialerKeyListener} with Unicode support. Converts any Unicode(e.g. Arabic) characters 25 * that represent digits into digits before filtering the results so that we can support 26 * pasted digits from Unicode languages. 27 */ 28 public class UnicodeDialerKeyListener extends DialerKeyListener { 29 public static final UnicodeDialerKeyListener INSTANCE = new UnicodeDialerKeyListener(); 30 31 @Override 32 public CharSequence filter(CharSequence source, int start, int end, 33 Spanned dest, int dstart, int dend) { 34 final String converted = PhoneNumberUtils.convertKeypadLettersToDigits( 35 PhoneNumberUtils.replaceUnicodeDigits(source.toString())); 36 // PhoneNumberUtils.replaceUnicodeDigits performs a character for character replacement, 37 // so we can assume that start and end positions should remain unchanged. 38 CharSequence result = super.filter(converted, start, end, dest, dstart, dend); 39 if (result == null) { 40 if (source.equals(converted)) { 41 // There was no conversion or filtering performed. Just return null according to 42 // the behavior of DialerKeyListener. 43 return null; 44 } else { 45 // filter returns null if the charsequence is to be returned unchanged/unfiltered. 46 // But in this case we do want to return a modified character string (even if 47 // none of the characters in the modified string are filtered). So if 48 // result == null we return the unfiltered but converted numeric string instead. 49 return converted.subSequence(start, end); 50 } 51 } 52 return result; 53 } 54 } 55
