android - 扩大 ClickableSpan 的触摸区域

Question

我有一个 TextView，我在其中设置了 HTML 文本。这篇文章有很多链接。当您点击一个链接时，它并不总是触发 onClick 方法。因此，我正在尝试扩展 ClickableSpan 的区域，以便它始终响应。

int start = strBuilder.getSpanStart(span);
int end = strBuilder.getSpanEnd(span);
int flags = strBuilder.getSpanFlags(span);
final ClickableSpan clickable = new ClickableSpan() {
  public void onClick(View view) {
    getTouchActions(span.getURL());
  }
};
strBuilder.setSpan(clickable, start, end, flags);
strBuilder.removeSpan(span);

Answer 1

CustomMovementMethod 必须扩展 ScrollingMovementMethod 并覆盖 onTouchEvent 方法。为了添加一些额外的空间，您必须在维度中定义它并在开始/结束跨度中使用它。

@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);

  int startSpan = off - context.getResources().getDimension(R.dimen.extra_space_start);
  int endSpan = off + context.getResources().getDimension(R.dimen.extra_space_end);

  ClickableSpan[] link = buffer.getSpans(startSpan, endSpan, ClickableSpan.class);

  if (link.length != 0) {
    if (action == MotionEvent.ACTION_UP) {
      link[0].onClick(widget);
    } else if (action == MotionEvent.ACTION_DOWN) {
      Selection.setSelection(buffer,
          buffer.getSpanStart(link[0]),
          buffer.getSpanEnd(link[0]));
    }

    return true;
  } else {
    Selection.removeSelection(buffer);
  }
}

return super.onTouchEvent(widget, buffer, event);

您可以这样调用您的自定义链接移动:

textView.setMovementMethod(new CustomLinkMovementMethod(context));
textView.setLinksClickable(true);