android view被挡住,Android 如何判断一个View在屏幕上可见

`private boolean isViewVisible(View host, Rect window, boolean fullVisible) {// Make sure our host view is attached to a visible window.

if (host.getWindowVisibility() == View.VISIBLE) {// An invisible predecessor or one with alpha zero means

// that this view is not visible to the user. Object current = host;

while (current instanceof View) {View view = (View) current;

// We have attach info so this view is attached and there is no

// need to check whether we reach to ViewRootImpl on the way up. if (view.getAlpha() <= 0 || view.getVisibility() != View.VISIBLE) {return false;

}current = view.getParent();

}// Check if the view is visible in window.

// host.getWindowVisibleDisplayFrame(mWindowRect); Rect visibleRect = new Rect();

if (fullVisible) {// Check if the view is entirely visible.

if (!host.getLocalVisibleRect(visibleRect)) {return false;

}return visibleRect.top == 0 && visibleRect.left == 0 &&

visibleRect.bottom == host.getHeight() && visibleRect.right == host.getWidth();

} else {// Check if the view is entirely covered by its predecessors.

if (!host.getGlobalVisibleRect(visibleRect)) {return false;

}return Rect.intersects(window, visibleRect);

}}

return false;`