1be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang/* 2be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang * Copyright (C) 2015 The Android Open Source Project 3be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang * 4be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang * Licensed under the Apache License, Version 2.0 (the "License"); 5be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang * you may not use this file except in compliance with the License. 6be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang * You may obtain a copy of the License at 7be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang * 8be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang * http://www.apache.org/licenses/LICENSE-2.0 9be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang * 10be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang * Unless required by applicable law or agreed to in writing, software 11be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang * distributed under the License is distributed on an "AS IS" BASIS, 12be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang * See the License for the specific language governing permissions and 14be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang * limitations under the License. 15be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang */ 16be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang 17be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tangpackage com.android.settings; 18be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang 19be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tangimport android.text.Spannable; 20be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tangimport android.text.TextPaint; 21be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tangimport android.text.method.LinkMovementMethod; 22be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tangimport android.text.style.ClickableSpan; 23be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tangimport android.view.View; 24be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tangimport android.widget.TextView; 25be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tangimport android.widget.TextView.BufferType; 26be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang 27be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang/** 28be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang * Utility class to create clickable links inside {@link TextView TextViews}. 29be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang */ 30be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tangpublic class LinkifyUtils { 31be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang private static final String PLACE_HOLDER_LINK_BEGIN = "LINK_BEGIN"; 32be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang private static final String PLACE_HOLDER_LINK_END = "LINK_END"; 33be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang 34be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang private LinkifyUtils() { 35be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang } 36be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang 37be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang /** Interface that handles the click event of the link */ 38be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang public interface OnClickListener { 39be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang void onClick(); 40be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang } 41be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang 42be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang /** 43be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang * Applies the text into the {@link TextView} and part of it a clickable link. 44be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang * The text surrounded with "LINK_BEGIN" and "LINK_END" will become a clickable link. Only 45be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang * supports at most one link. 46be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang * @return true if the link has been successfully applied, or false if the original text 47be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang * contains no link place holders. 48be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang */ 49be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang public static boolean linkify(TextView textView, StringBuilder text, 50be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang final OnClickListener listener) { 51be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang // Remove place-holders from the string and record their positions 52be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang final int beginIndex = text.indexOf(PLACE_HOLDER_LINK_BEGIN); 53be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang if (beginIndex == -1) { 54be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang textView.setText(text); 55be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang return false; 56be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang } 57be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang text.delete(beginIndex, beginIndex + PLACE_HOLDER_LINK_BEGIN.length()); 58be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang final int endIndex = text.indexOf(PLACE_HOLDER_LINK_END); 59be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang if (endIndex == -1) { 60be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang textView.setText(text); 61be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang return false; 62be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang } 63be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang text.delete(endIndex, endIndex + PLACE_HOLDER_LINK_END.length()); 64be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang 65be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang textView.setText(text.toString(), BufferType.SPANNABLE); 66be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang textView.setMovementMethod(LinkMovementMethod.getInstance()); 67be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang Spannable spannableContent = (Spannable) textView.getText(); 68be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang ClickableSpan spannableLink = new ClickableSpan() { 69be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang @Override 70be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang public void onClick(View widget) { 71be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang listener.onClick(); 72be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang } 73be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang 74be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang @Override 75be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang public void updateDrawState(TextPaint ds) { 76be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang super.updateDrawState(ds); 77be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang ds.setUnderlineText(false); 78be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang } 79be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang }; 80be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang spannableContent.setSpan(spannableLink, beginIndex, endIndex, 81be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang Spannable.SPAN_EXCLUSIVE_EXCLUSIVE); 82be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang return true; 83be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang } 84be794c30ca49c17521e66482ce30c94ffb2ec8eeLifu Tang} 85