TextView添加链接

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TextView添加链接

本文主要介绍TextView添加链接的几种可行及不可行方式，并且分析为什么不可行。示例APK地址TrineaAndroidDemo.apk，效果图如下：

text_add_link

一、可行方式

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<TextView
    android:id="@+id/trineaInfo"
    android:layout_width="match_parent"
    android:layout_height="wrap_content" />
trineaInfoTv = (Button)activity.findViewById(R.id.trineaInfo);
trineaInfoTv.setMovementMethod(LinkMovementMethod.getInstance());
Spanned text = Html.fromHtml("个人主页:<a href=\"http://www.trinea.cn\"> Trinea</a>");
trineaInfoTv.setText(text);

显示链接样式，能点击，touch即点击

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<TextView
    android:id="@+id/trineaInfo"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"/>
trineaInfoTv=(Button)activity.findViewById(R.id.trineaInfo);
Spannedtext=Html.fromHtml("个人主页:<a href=\"http://www.trinea.cn\"> Trinea</a>");
trineaInfoTv.setOnClickListener(newOnClickListener(){
 
    @Override
    publicvoidonClick(Viewv){
        Uriweb=Uri.parse("http://www.trinea.cn");
        Intenti=newIntent(Intent.ACTION_VIEW,web);
        i.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        activity.startActivity(i);
    }
});

显示链接样式，能点击。通过手动设置textView的OnClickListener完成点击响应。

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<TextView
    android:id="@+id/trineaInfo"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:autoLink="all" />
trineaInfoTv = (Button)activity.findViewById(R.id.trineaInfo);
trineaInfoTv.setText("个人主页:http://www.trinea.cn");

显示链接样式，并且能点击(只响应http://www.trinea.cn部分点击)，不过不支持如下的href形式

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trineaInfoTv.setText("个人主页:<a href=\"http://www.trinea.cn\"> Trinea</a>");

二、不可行方式

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<TextView
    android:id="@+id/trineaInfo"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:autoLink="all" />
trineaInfoTv = (Button)activity.findViewById(R.id.trineaInfo);
Spanned text = Html.fromHtml("个人主页:<a href=\"http://www.trinea.cn\"> Trinea</a>");
trineaInfoTv.setText(text);

显示链接样式，不能点击

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<TextView
    android:id="@+id/trineaInfo"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"/>
trineaInfoTv=(Button)activity.findViewById(R.id.trineaInfo);
Spannedtext=Html.fromHtml("个人主页:<a href=\"http://www.trinea.cn\"> Trinea</a>");
trineaInfoTv.setText(text);

显示链接样式，不能点击

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<TextView
    android:id="@+id/trineaInfo"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:autoLink="all" />
trineaInfoTv = (Button)activity.findViewById(R.id.trineaInfo);
trineaInfoTv.setMovementMethod(LinkMovementMethod.getInstance());
Spanned text = Html.fromHtml("个人主页:<a href=\"http://www.trinea.cn\"> Trinea</a>");
trineaInfoTv.setText(text);

不显示链接样式，不能点击

三、通过源码分析原因

TextView.setText函数主要源代码如下：

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        if(!isSuggestionUnderLineRefreshFlag){
            if(type==BufferType.EDITABLE||mInput!=null
                    ||needEditableForNotification){
                Editablet=mEditableFactory.newEditable(text);
                text=t;
                setFilters(t,mFilters);
                InputMethodManagerimm=InputMethodManager.peekInstance();
                if(imm!=null)
                    imm.restartInput(this);
            }elseif(type==BufferType.SPANNABLE||mMovement!=null){
                text=mSpannableFactory.newSpannable(text);
            }elseif(!(textinstanceofCharWrapper)){
                text=TextUtils.stringOrSpannedString(text);
            }
        }
        if(mAutoLinkMask!=0){
            Spannables2;
 
            if(type==BufferType.EDITABLE||textinstanceofSpannable){
                s2=(Spannable)text;
            }else{
                s2=mSpannableFactory.newSpannable(text);
            }
 
            if(Linkify.addLinks(s2,mAutoLinkMask)){
                text=s2;
                type=(type==BufferType.EDITABLE)?BufferType.EDITABLE:BufferType.SPANNABLE;
 
                /*
                 * We must go ahead and set the text before changing the
                 * movement method, because setMovementMethod() may call
                 * setText() again to try to upgrade the buffer type.
                 */
                mText=text;
 
                // Do not change the movement method for text that support text selection as it
                // would prevent an arbitrary cursor displacement.
                if(mLinksClickable&&!textCanBeSelected()){
                    setMovementMethod(LinkMovementMethod.getInstance());
                }
            }
        }

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