TextView添加链接

2022-03-21 05:45:42

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可从这些地址下载：Google Play, 360手机助手, 百度手机助手, 小米应用商店, 豌豆荚效果图如下：

一、可行方式

Java

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<TextView
 android:id="@+id/trineaInfo"
 android:layout_width="match_parent"
 android:layout_height="wrap_content" />
trineaInfoTv = (TextView)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

Java

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<TextView
 android:id="@+id/trineaInfo"
 android:layout_width="match_parent"
 android:layout_height="wrap_content" />
trineaInfoTv = (TextView)activity.findViewById(R.id.trineaInfo);
Spanned text = Html.fromHtml("个人主页:<a href=\"http://www.trinea.cn\"> Trinea</a>");
trineaInfoTv.setOnClickListener(new OnClickListener() {
 @Override
 public void onClick(View v) {
 Uri web = Uri.parse("http://www.trinea.cn");
 Intent i = new Intent(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。

Java

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<TextView
 android:id="@+id/trineaInfo"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:autoLink="all" />
trineaInfoTv = (TextView)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

Java

1	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 = (TextView)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

Java

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<TextView
 android:id="@+id/trineaInfo"
 android:layout_width="match_parent"
 android:layout_height="wrap_content" />
trineaInfoTv = (TextView)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

Java

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<TextView
 android:id="@+id/trineaInfo"
 android:layout_width="match_parent"
 android:layout_height="wrap_content"
 android:autoLink="all" />
trineaInfoTv = (TextView)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) {
 Editable t = mEditableFactory.newEditable(text);
 text = t;
 setFilters(t, mFilters);
 InputMethodManager imm = InputMethodManager.peekInstance();
 if (imm != null)
 imm.restartInput(this);
 } else if (type == BufferType.SPANNABLE || mMovement != null) {
 text = mSpannableFactory.newSpannable(text);
 } else if (!(text instanceof CharWrapper)) {
 text = TextUtils.stringOrSpannedString(text);
 }
 }
 if (mAutoLinkMask != 0) {
 Spannable s2;
 if (type == BufferType.EDITABLE || text instanceof Spannable) {
 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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