AbsHListView.java 文件源码

/**
 * Sets the selector state to "pressed" and posts a CheckForKeyLongPress to
 * see if this is a long press.
 */
protected void keyPressed() {
    if (!isEnabled() || !isClickable()) {
        return;
    }

    Drawable selector = mSelector;
    Rect selectorRect = mSelectorRect;
    if (selector != null && (isFocused() || touchModeDrawsInPressedState())
            && !selectorRect.isEmpty()) {

        final View v = getChildAt(mSelectedPosition - mFirstPosition);

        if (v != null) {
            if (v.hasFocusable())
                return;
            v.setPressed(true);
        }
        setPressed(true);

        final boolean longClickable = isLongClickable();
        Drawable d = selector.getCurrent();
        if (d != null && d instanceof TransitionDrawable) {
            if (longClickable) {
                ((TransitionDrawable) d).startTransition(ViewConfiguration
                        .getLongPressTimeout());
            } else {
                ((TransitionDrawable) d).resetTransition();
            }
        }
        if (longClickable && !mDataChanged) {
            if (mPendingCheckForKeyLongPress == null) {
                mPendingCheckForKeyLongPress = new CheckForKeyLongPress();
            }
            mPendingCheckForKeyLongPress.rememberWindowAttachCount();
            postDelayed(mPendingCheckForKeyLongPress,
                    ViewConfiguration.getLongPressTimeout());
        }
    }
}