Android获取activity的所有子view(使用到递归)

//-----------------获取 activity中的所有view
private void getAllViews(Activity act) {
List<View> list = getAllChildViews(act.getWindow().getDecorView());
}

private List<View> getAllChildViews(View view) {
List<View> allchildren = new ArrayList<View>();
if (view instanceof ViewGroup) {
ViewGroup vp = (ViewGroup) view;
for (int i = 0; i < vp.getChildCount(); i++) {
View viewchild = vp.getChildAt(i);
allchildren.add(viewchild);
//再次 调用本身（递归）
allchildren.addAll(getAllChildViews(viewchild));
}
}
return allchildren;
}