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.dialpadview; 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 that 25 * represent digits into digits before filtering the results so that we can support pasted digits 26 * from Unicode languages. 27 */ 28 public class UnicodeDialerKeyListener extends DialerKeyListener { 29 30 public static final UnicodeDialerKeyListener INSTANCE = new UnicodeDialerKeyListener(); 31 32 @Override 33 public CharSequence filter( 34 CharSequence source, int start, int end, Spanned dest, int dstart, int dend) { 35 final String converted = 36 PhoneNumberUtils.convertKeypadLettersToDigits( 37 PhoneNumberUtils.replaceUnicodeDigits(source.toString())); 38 // PhoneNumberUtils.replaceUnicodeDigits performs a character for character replacement, 39 // so we can assume that start and end positions should remain unchanged. 40 CharSequence result = super.filter(converted, start, end, dest, dstart, dend); 41 if (result == null) { 42 if (source.equals(converted)) { 43 // There was no conversion or filtering performed. Just return null according to 44 // the behavior of DialerKeyListener. 45 return null; 46 } else { 47 // filter returns null if the charsequence is to be returned unchanged/unfiltered. 48 // But in this case we do want to return a modified character string (even if 49 // none of the characters in the modified string are filtered). So if 50 // result == null we return the unfiltered but converted numeric string instead. 51 return converted.subSequence(start, end); 52 } 53 } 54 return result; 55 } 56 } 57
