get parent s view from a layout

Question

I have a FragmentActivity with this layout    lt  xml version  1 0  encoding  utf-8   gt   lt RelativeLayout xmlns android  http   schemas android com apk res android  xmlns tools  http   schemas android com tools  android layout width  match parent  android layout height  match parent   gt    lt TextView     android id    id textView1      android layout width  wrap content      android layout height  wrap content      android text   string menulabel      android textSize  24sp    gt    lt EditText     android id    id editText1      android layout width  wrap content      android layout height  wrap content      android ems  10      android inputType  text      android layout below    id textView1      android hint   string search title hint    gt    lt TextView     android id    id textView2      android layout width  wrap content      android layout height  wrap content      android text   string spinnersearch      android layout below    id editText1    gt    lt LinearLayout     android id    id layout1      android layout width  wrap content      android layout height  wrap content      android layout below    id textView2   gt        lt Spinner         android id    id spinner search          android layout width  wrap content          android layout height  wrap content          android prompt   string spinnersearch    gt        lt Button         android id    id button1          android layout width  wrap content          android layout height  wrap content          android text   string reset search    gt    lt  LinearLayout gt    lt Button     android id    id button2      android layout width  wrap content      android layout height  wrap content      android text   string buttonnewcat      android layout below    id layout1    gt    lt Button     android id    id button3      android layout width  wrap content      android layout height  wrap content      android text   string buttondelcat       android layout below    id button2    gt    lt Button     android id    id button4      android layout width  wrap content      android layout height  wrap content      android text   string buttoneditcat      android layout below    id button3    gt    lt Button     android id    id button5      android layout width  wrap content      android layout height  wrap content      android text   string buttonnewtext      android layout below    id button4    gt    lt Button     android id    id button6      android layout width  wrap content      android layout height  wrap content      android text   string buttondeltext      android layout below    id button5    gt    lt RelativeLayout     android layout width  match parent      android layout height  match parent   gt        lt side menu scroll ScrollerLinearLayout         android id    id menu content side slide layout          android layout width  match parent          android layout height  match parent          android orientation  vertical   gt            lt LinearLayout             android layout width  match parent              android layout height  45dp              android background   drawable ab solid example              android orientation  horizontal   gt                lt ImageView                 android id    id main tmp button                  android layout width  wrap content                  android layout height  wrap content                  android background   drawable actionbar background                  android src   drawable download    gt            lt  LinearLayout gt           lt FrameLayout             android id    id fragment container              android layout width  match parent              android layout height  match parent              android background   drawable bg groud    gt        lt  side menu scroll ScrollerLinearLayout gt   lt  RelativeLayout gt      and the ScrollerLinearLayout class is something like this   public class ScrollerLinearLayout extends LinearLayout          code of the class     How to access from ScrollerLinearLayout to the parent layout to get - for example - the editetxt  FragmentActivity and ScrollerLineraLayout are in different packages of the same projects  I tried to use the getParent   function in this way within the ScrollerLinearLayout but it doesn t work   RelativeLayout r    RelativeLayout  this getParent   getParent    int w   r findViewById R id editText1  getLayoutParams   width    Someone help me  Thanks

User · Answer

If you are trying to find a View from your Fragment then try doing it like this   int w     EditText getActivity   findViewById R id editText1   getLayoutParams   width

User · Answer

The RelativeLayout  i e  the ViewParent  should have a resource Id defined in the layout file  for example  android id   id myParentViewId   If you don t do that  the call to getId will return null  Look at this answer for more info

User · Answer

Check my answer here  The use of Layout Inspector tool can be very convenient when you have a complex view or you are using a third party library where you can t add an id to a view

User · Answer

This also works   this getCurrentFocus     It gets the view so I can use it

User · Answer

You can get ANY view by using the code below view rootView findViewById R id  name of the view   EDIT  This works on Kotlin  In Java  you may need to do something like this  this getCurrentFocus   getRootView   findViewById R id  name of the view    I learned getCurrentFocus   function from   JFreeman  s answer

User · Answer

Just write   this getRootView

User · Answer

The getParent method returns a ViewParent  not a View  You need to cast the first call to getParent   also   RelativeLayout r    RelativeLayout    ViewGroup  this getParent    getParent      As stated in the comments by the OP  this is causing a NPE  To debug  split this up into multiple parts   ViewParent parent   this getParent    RelativeLayout r  if  parent    null        Log d  TEST    this getParent   is null      else       if  parent instanceof ViewGroup            ViewParent grandparent     ViewGroup  parent  getParent            if  grandparent    null                Log d  TEST      ViewGroup  this getParent    getParent   is null                      else               if  parent instanceof RelativeLayout                    r    RelativeLayout  grandparent                            else                   Log d  TEST      ViewGroup  this getParent    getParent   is not a RelativeLayout                                      else           Log d  TEST    this getParent   is not a ViewGroup               now r is set to the desired RelativeLayout

[android] get parent's view from a layout

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