85 lines
3.0 KiB
Java
85 lines
3.0 KiB
Java
/*
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* Copyright (C) 2015 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package com.android.settings;
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import android.text.Spannable;
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import android.text.TextPaint;
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import android.text.method.LinkMovementMethod;
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import android.text.style.ClickableSpan;
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import android.view.View;
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import android.widget.TextView;
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import android.widget.TextView.BufferType;
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/**
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* Utility class to create clickable links inside {@link TextView TextViews}.
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*/
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public class LinkifyUtils {
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private static final String PLACE_HOLDER_LINK_BEGIN = "LINK_BEGIN";
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private static final String PLACE_HOLDER_LINK_END = "LINK_END";
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private LinkifyUtils() {
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}
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/** Interface that handles the click event of the link */
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public interface OnClickListener {
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void onClick();
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}
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/**
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* Applies the text into the {@link TextView} and part of it a clickable link.
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* The text surrounded with "LINK_BEGIN" and "LINK_END" will become a clickable link. Only
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* supports at most one link.
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* @return true if the link has been successfully applied, or false if the original text
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* contains no link place holders.
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*/
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public static boolean linkify(TextView textView, StringBuilder text,
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final OnClickListener listener) {
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// Remove place-holders from the string and record their positions
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final int beginIndex = text.indexOf(PLACE_HOLDER_LINK_BEGIN);
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if (beginIndex == -1) {
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textView.setText(text);
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return false;
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}
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text.delete(beginIndex, beginIndex + PLACE_HOLDER_LINK_BEGIN.length());
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final int endIndex = text.indexOf(PLACE_HOLDER_LINK_END);
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if (endIndex == -1) {
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textView.setText(text);
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return false;
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}
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text.delete(endIndex, endIndex + PLACE_HOLDER_LINK_END.length());
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textView.setText(text.toString(), BufferType.SPANNABLE);
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textView.setMovementMethod(LinkMovementMethod.getInstance());
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Spannable spannableContent = (Spannable) textView.getText();
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ClickableSpan spannableLink = new ClickableSpan() {
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@Override
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public void onClick(View widget) {
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listener.onClick();
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}
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@Override
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public void updateDrawState(TextPaint ds) {
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super.updateDrawState(ds);
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ds.setUnderlineText(false);
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}
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};
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spannableContent.setSpan(spannableLink, beginIndex, endIndex,
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Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
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return true;
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}
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}
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