Lifu Tang | be794c3 | 2015-03-26 17:56:19 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2015 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.settings; |
| 18 | |
| 19 | import android.text.Spannable; |
| 20 | import android.text.TextPaint; |
| 21 | import android.text.method.LinkMovementMethod; |
| 22 | import android.text.style.ClickableSpan; |
| 23 | import android.view.View; |
| 24 | import android.widget.TextView; |
| 25 | import android.widget.TextView.BufferType; |
| 26 | |
| 27 | /** |
| 28 | * Utility class to create clickable links inside {@link TextView TextViews}. |
| 29 | */ |
| 30 | public class LinkifyUtils { |
| 31 | private static final String PLACE_HOLDER_LINK_BEGIN = "LINK_BEGIN"; |
| 32 | private static final String PLACE_HOLDER_LINK_END = "LINK_END"; |
| 33 | |
| 34 | private LinkifyUtils() { |
| 35 | } |
| 36 | |
| 37 | /** Interface that handles the click event of the link */ |
| 38 | public interface OnClickListener { |
| 39 | void onClick(); |
| 40 | } |
| 41 | |
| 42 | /** |
| 43 | * Applies the text into the {@link TextView} and part of it a clickable link. |
| 44 | * The text surrounded with "LINK_BEGIN" and "LINK_END" will become a clickable link. Only |
| 45 | * supports at most one link. |
| 46 | * @return true if the link has been successfully applied, or false if the original text |
| 47 | * contains no link place holders. |
| 48 | */ |
| 49 | public static boolean linkify(TextView textView, StringBuilder text, |
| 50 | final OnClickListener listener) { |
| 51 | // Remove place-holders from the string and record their positions |
| 52 | final int beginIndex = text.indexOf(PLACE_HOLDER_LINK_BEGIN); |
| 53 | if (beginIndex == -1) { |
| 54 | textView.setText(text); |
| 55 | return false; |
| 56 | } |
| 57 | text.delete(beginIndex, beginIndex + PLACE_HOLDER_LINK_BEGIN.length()); |
| 58 | final int endIndex = text.indexOf(PLACE_HOLDER_LINK_END); |
| 59 | if (endIndex == -1) { |
| 60 | textView.setText(text); |
| 61 | return false; |
| 62 | } |
| 63 | text.delete(endIndex, endIndex + PLACE_HOLDER_LINK_END.length()); |
| 64 | |
| 65 | textView.setText(text.toString(), BufferType.SPANNABLE); |
| 66 | textView.setMovementMethod(LinkMovementMethod.getInstance()); |
| 67 | Spannable spannableContent = (Spannable) textView.getText(); |
| 68 | ClickableSpan spannableLink = new ClickableSpan() { |
| 69 | @Override |
| 70 | public void onClick(View widget) { |
| 71 | listener.onClick(); |
| 72 | } |
| 73 | |
| 74 | @Override |
| 75 | public void updateDrawState(TextPaint ds) { |
| 76 | super.updateDrawState(ds); |
Tsung-Mao Fang | 605218c | 2020-02-06 16:36:59 +0800 | [diff] [blame] | 77 | ds.setUnderlineText(true); |
Lifu Tang | be794c3 | 2015-03-26 17:56:19 -0700 | [diff] [blame] | 78 | } |
| 79 | }; |
| 80 | spannableContent.setSpan(spannableLink, beginIndex, endIndex, |
| 81 | Spannable.SPAN_EXCLUSIVE_EXCLUSIVE); |
| 82 | return true; |
| 83 | } |
| 84 | } |