Android去除autoLink的下划線

很多時候我們開發中使用TextView的autoLink屬性，可以很方便的識別出一段文本中的網址、電話、郵箱等等。但是通常情況下系統自動識別的link會有下划線，那么該如何去除這個下划線呢？

首先，我們需要知道這個下划線哪里來的，直接打開URLSpan的父類ClickableSpan：

/*
 * Copyright (C) 2008 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 android.text.style;

import android.text.TextPaint;
import android.view.View;

/**
 * If an object of this type is attached to the text of a TextView
 * with a movement method of LinkMovementMethod, the affected spans of
 * text can be selected.  If clicked, the {@link #onClick} method will
 * be called.
 */
public abstract class ClickableSpan extends CharacterStyle implements UpdateAppearance {

    /**
     * Performs the click action associated with this span.
     */
    public abstract void onClick(View widget);
   
    /**
     * Makes the text underlined and in the link color.
     */
    @Override
    public void updateDrawState(TextPaint ds) {
        ds.setColor(ds.linkColor);
        ds.setUnderlineText(true);
    }
}

上述41行可以看到通過ds.setUnderlineText設置了下划線，找到了原因，就比較好辦了。我們自己寫一個類重寫updateDrawState即可：

import android.annotation.SuppressLint;
import android.text.TextPaint;
import android.text.style.URLSpan;
import android.text.style.UnderlineSpan;

/**
 * 
 *
 * @author pzyoung
 *
 */

@SuppressLint("ParcelCreator")
public class NoUnderlineSpan extends URLSpan {
    public NoUnderlineSpan(String url) {
        super(url);
    }

    @Override
    public void updateDrawState(TextPaint ds) {
        if (ds != null) {
            ds.setColor(ds.linkColor);
            ds.setUnderlineText(false);
        }
    }

}

 

然后怎么應用呢？這里需要找到文本中需要替換的url，可以自己去匹配，也可以像我這樣做：

              if (textView.getText() instanceof Spannable) {
                    URLSpan[] urlSpans = (((Spannable) textView.getText()).getSpans(0, textView.getText().length() - 1, URLSpan.class));
                    for (URLSpan urlSpan : urlSpans) {
                        String url = urlSpan.getURL();
                        int start = ((Spannable) textView.getText()).getSpanStart(urlSpan);
                        int end = ((Spannable) textView.getText()).getSpanEnd(urlSpan);
                        NoUnderlineSpan noUnderlineSpan = new NoUnderlineSpan(url);
                        Spannable s = (Spannable) textView.getText();
                        s.setSpan(noUnderlineSpan, start, end, Spanned.SPAN_POINT_MARK);
                    }
                }

通過getSpan方法找到所有的URLSpan，然后再通過getSpanStart getSpanEnd方法找到對應的start 、end進而就可以設置我們自己定義的span了。