Android去除autoLink的下劃線

不少時候咱們開發中使用TextView的autoLink屬性，能夠很方便的識別出一段文本中的網址、電話、郵箱等等。可是一般狀況下系統自動識別的link會有下劃線，那麼該如何去除這個下劃線呢？

首先，咱們須要知道這個下劃線哪裏來的，直接打開URLSpan的父類ClickableSpan：

 1 /*
 2  * Copyright (C) 2008 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 android.text.style;
18 
19 import android.text.TextPaint;
20 import android.view.View;
21 
22 /**
23  * If an object of this type is attached to the text of a TextView
24  * with a movement method of LinkMovementMethod, the affected spans of
25  * text can be selected.  If clicked, the {@link #onClick} method will
26  * be called.
27  */
28 public abstract class ClickableSpan extends CharacterStyle implements UpdateAppearance {
29 
30     /**
31      * Performs the click action associated with this span.
32      */
33     public abstract void onClick(View widget);
34    
35     /**
36      * Makes the text underlined and in the link color.
37      */
38     @Override
39     public void updateDrawState(TextPaint ds) {
40         ds.setColor(ds.linkColor);
41         ds.setUnderlineText(true);
42     }
43 }

上述41行能夠看到經過ds.setUnderlineText設置了下劃線，找到了緣由，就比較好辦了。咱們本身寫一個類重寫updateDrawState便可：

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);
        }
    }

}

 

而後怎麼應用呢？這裏須要找到文本中須要替換的url，能夠本身去匹配，也能夠像我這樣作：

              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);
                    }
                }

經過getSpan方法找到全部的URLSpan，而後再經過getSpanStart getSpanEnd方法找到對應的start 、end進而就能夠設置咱們本身定義的span了。