requestFocus() 与 requestFocusFromTouch() 方法的区别

原创

于 2015-05-04 23:26:26 发布 · 2.4w 阅读

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本文探讨了Android中requestFocus()和requestFocusFromTouch()的区别。requestFocus()用于常规获取焦点，而requestFocusFromTouch()则在触摸事件发生时请求焦点。了解这两个方法的工作原理对于优化用户交互至关重要。

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两个方法都是获取焦点：

requestFocus() 源码如下：

/**
     * Call this to try to give focus to a specific view or to one of its descendants
     * and give it hints about the direction and a specific rectangle that the focus
     * is coming from.  The rectangle can help give larger views a finer grained hint
     * about where focus is coming from, and therefore, where to show selection, or
     * forward focus change internally.
     *
     * @return Whether this view or one of its descendants actually took focus.
     */
    public boolean requestFocus(int direction, Rect previouslyFocusedRect) {
        // need to be focusable
        if ((mViewFlags & FOCUSABLE_MASK) != FOCUSABLE ||
                (mViewFlags & VISIBILITY_MASK) != VISIBLE) {
            return false;
        }


        // need to be focusable in touch mode if in touch mode
        if (isInTouchMode() &&