android中实现文字的超链接的应用内跳转

实现像新浪微博那样的文字中有蓝色超链接，点击后跳转到应用里面的指定页面。



首先自定义一个touchListerner：

/**
* Created by App-Dev on 2015/10/20.
* 识别超链接的touchListener
*/
public class FindUrlTouchListener implements View.OnTouchListener {

@Override
public boolean onTouch(View v, MotionEvent event) {
boolean ret = false;
TextView textView = (TextView) v;
CharSequence text = textView.getText();
Spannable sText = Spannable.Factory.getInstance().newSpannable(text);
int action = event.getAction();

//超链接的识别
if (action == MotionEvent.ACTION_UP || action == MotionEvent.ACTION_DOWN) {
int x = (int) event.getX();
int y = (int) event.getY();

x -= textView.getTotalPaddingLeft();
y -= textView.getTotalPaddingTop();

x += textView.getScrollX();
y += textView.getScrollY();

Layout layout = textView.getLayout();
if (layout != null) {
int line = layout.getLineForVertical(y);
int off = layout.getOffsetForHorizontal(line, x);

ClickableSpan[] link = sText.getSpans(off, off, ClickableSpan.class);

if (link.length != 0) {
//添加按压后的背景颜色
if (action == MotionEvent.ACTION_DOWN) {
Spanned sp = (Spanned) text;
int st = sp.getSpanStart(link[0]);
int en = sp.getSpanEnd(link[0]);
sText.setSpan(new BackgroundColorSpan(v.getResources().getColor(R.color.linkBg)), st, en, Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
textView.setText(sText);
}

if (action == MotionEvent.ACTION_UP) {
//清除按压后的背景颜色
BackgroundColorSpan[] bcs = sText.getSpans(off, off, BackgroundColorSpan.class);
if (bcs.length != 0) {
sText.removeSpan(bcs[0]);
textView.setText(sText);
}
//处理超链接
URLSpan[] urls = sText.getSpans(off, off, URLSpan.class);
//获取超链接网址
  String url = urls[0].getURL();
if ((url.contains("匹配条件")) {
/**
* 通过url打开对应的应用页面
*/
  } else {
//超链接为空
if (!TextUtils.isEmpty(url)) {
try {
link[0].onClick(v);
} catch (Exception e) {
e.printStackTrace();
}
}
}
}
ret = true;
}
}
}

//清除按压后的背景颜色
if (action == MotionEvent.ACTION_CANCEL || action == MotionEvent.ACTION_UP) {
BackgroundColorSpan[] bcs = sText.getSpans(0, text.length(), BackgroundColorSpan.class);
if (bcs.length != 0) {
sText.removeSpan(bcs[0]);
textView.setText(sText);
}
}
return ret;
}
}

然后textView设置OnTouchListener:

textView.setOnTouchListener(new FindUrlTouchListener());

最后只需要将包含超链接的文本设置到textView中（注意使用：Html.from(str);）：

textView.setText(Html.from(str));

默认情况下textView中的超链接会有下划线。通过下面的方法可以去除：

//去掉链接的下划线
private static void setHtmlStyle(TextView textView) {
Spannable s = new Spannable.Factory().newSpannable(textView.getText());
URLSpan[] spans = s.getSpans(0, s.length(), URLSpan.class);
for (URLSpan span : spans) {
int start = s.getSpanStart(span);
int end = s.getSpanEnd(span);
s.removeSpan(span);
span = new URLSpanNoUnderline(span.getURL());
s.setSpan(span, start, end, 0);
}
textView.setText(s);
}

private static class URLSpanNoUnderline extends URLSpan {
public URLSpanNoUnderline(String url) {
super(url);
}

@Override
public void updateDrawState(TextPaint ds) {
super.updateDrawState(ds);
ds.setUnderlineText(false);
}

@Override
public void onClick(View widget) {
super.onClick(widget);
}
}