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