自定义LinkMovementMethod处理textview的链接点击事件

CustomeLinkMovementMethod.java

        private final RectF touchedLineBounds = new RectF();

        @Override
        public boolean onTouchEvent(TextView widget, Spannable buffer,
                                    MotionEvent event) {
            int action = event.getAction();

            if (action == MotionEvent.ACTION_UP ||
                    action == MotionEvent.ACTION_DOWN) {
                int x = (int) event.getX();
                int y = (int) event.getY();

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

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

                Layout layout = widget.getLayout();
                int line = layout.getLineForVertical(y);
                int off = layout.getOffsetForHorizontal(line, x);

                touchedLineBounds.left = layout.getLineLeft(line);
                touchedLineBounds.top = layout.getLineTop(line);
                touchedLineBounds.right = layout.getLineWidth(line) + touchedLineBounds.left;
                touchedLineBounds.bottom = layout.getLineBottom(line);

                if (touchedLineBounds.contains(x, y)) {
                    final ClickableSpan[] link = buffer.getSpans(off, off, ClickableSpan.class);
                    if (link.length == 0) {
                        Selection.removeSelection(buffer);
                        return Touch.onTouchEvent(widget, buffer, event);
                    }
                    ClickableSpan targetObj = link[0];
                    if (action == MotionEvent.ACTION_UP) {
                        URLSpan urlSpan = (URLSpan) targetObj;
                        handlerTouchEvent(urlSpan, widget);
                    } else if (action == MotionEvent.ACTION_DOWN) {
                        Selection.setSelection(buffer, buffer.getSpanStart(targetObj), buffer.getSpanEnd(targetObj));
                    }
                    return true;
                }
            }
            return Touch.onTouchEvent(widget, buffer, event);
        }

        public abstract void handlerTouchEvent(URLSpan urlSpan, TextView widget);

处理了点击事件，对于点击处在链接之外的做了处理，touchedLineBounds.contains(x, y) 这个就是判断点击的点，是否是在链接上，如果不在，就不触发打开链接，或者是其他自定义的业务。

touchedLineBounds的判断是出自于
https://github.com/Saketme/Better-Link-Movement-Method

touchedLineBounds.left = layout.getLineLeft(line);
touchedLineBounds.top = layout.getLineTop(line);
touchedLineBounds.right = layout.getLineWidth(line) + touchedLineBounds.left;
touchedLineBounds.bottom = layout.getLineBottom(line);

关键代码是这个