Android -覆盖TalkBack手势

Question

我想在我的应用程序中使用TalkBack，但仍然希望一些活动的行为有所不同。例如，当输入一个特定的活动时，我想要选择一个按钮(触发一个按钮点击)，当我从该按钮上抬起手指时。TalkBack仅支持双击以选择按钮。

如何“覆盖”TalkBack手势？

谢谢!

Answer 1

您可以在HOVER_EXIT上执行单击操作，但您需要做一些工作来防止TalkBack期望正常的双击操作。电话拨号器的DialPadImageButton就是一个很好的例子。下面是该类的一些相关代码部分：

@Override
public boolean onHoverEvent(MotionEvent event) {
    // When touch exploration is turned on, lifting a finger while inside
    // the button's hover target bounds should perform a click action.
    if (mAccessibilityManager.isEnabled()
            && mAccessibilityManager.isTouchExplorationEnabled()) {
        switch (event.getActionMasked()) {
            case MotionEvent.ACTION_HOVER_ENTER:
                // Lift-to-type temporarily disables double-tap activation.
                setClickable(false);
                break;
            case MotionEvent.ACTION_HOVER_EXIT:
                if (mHoverBounds.contains((int) event.getX(), (int) event.getY())) {
                    simulateClickForAccessibility();
                }
                setClickable(true);
                break;
        }
    }

    return super.onHoverEvent(event);
}

/**
 * When accessibility is on, simulate press and release to preserve the
 * semantic meaning of performClick(). Required for Braille support.
 */
private void simulateClickForAccessibility() {
    // Checking the press state prevents double activation.
    if (isPressed()) {
        return;
    }

    setPressed(true);

    // Stay consistent with performClick() by sending the event after
    // setting the pressed state but before performing the action.
    sendAccessibilityEvent(AccessibilityEvent.TYPE_VIEW_CLICKED);

    setPressed(false);
}