android - LinkMovementMethod 僵硬滚动

Question

我有一个只有 TextView 的 Activity 。 TextView 很长(需要垂直滚动)并且有一些链接。

为了滚动和拦截链接，我有以下代码:

TextView textView = (TextView) getView().findViewById(R.id.help_text_view);
textView.setMovementMethod(LinkMovementMethod.getInstance());

问题是滚动是“僵硬的”，也就是说，您不能像在大多数 View 中所期望的那样上下移动文本。只要抬起手指/光标，文本就会停止移动。

如何恢复正常的 Fling 功能？

Answer 1

我的解决方案是创建自己的 MovementMethod 并自己实现点击

private MovementMethod createMovementMethod ( Context context ) {
    final GestureDetector detector = new GestureDetector(context, new GestureDetector.SimpleOnGestureListener() {
        @Override
        public boolean onSingleTapUp ( MotionEvent e ) {
            return true;
        }

        @Override
        public boolean onSingleTapConfirmed ( MotionEvent e ) {
            return true;
        }
    });
    return new ScrollingMovementMethod() {
        @Override
        public boolean onTouchEvent ( @NotNull TextView widget, @NotNull Spannable buffer, @NotNull MotionEvent event ) {
            // check if event is a single tab
            boolean isClickEvent = detector.onTouchEvent(event);

            // detect span that was clicked
            if (isClickEvent) {
                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);

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

                if (link.length != 0) {
                    // execute click only for first clickable span
                    // can be a for each loop to execute every one
                    link[0].onClick(widget);
                    return true;
                }
            }

            // let scroll movement handle the touch
            return super.onTouchEvent(widget, buffer, event);
        }
    };
}