Why does LayoutInflater ignore the layout width and layout height layout parameters I ve specified

Question

I ve had severe trouble getting LayoutInflater to work as expected  and so did other people  How to use layoutinflator to add views at runtime    Why does LayoutInflater ignore the layout parameters I ve specified  E g  why are the layout width and layout height values from my resources XML not honored

User · Answer

andig is correct that a common reason for LayoutInflater ignoring your layout_params would be because a root was not specified. Many people think you can pass in null for root. This is acceptable for a few scenarios such as a dialog, where you don't have access to root at the time of creation. A good rule to follow, however, is that if you have root, give it to LayoutInflater.

I wrote an in-depth blog post about this that you can check out here:

https://www.bignerdranch.com/blog/understanding-androids-layoutinflater-inflate/

User · Answer

I ve investigated this issue  referring to the LayoutInflater docs and setting up a small sample demonstration project  The following tutorials shows how to dynamically populate a layout using LayoutInflater   Before we get started see what LayoutInflater inflate   parameters look like    resource  ID for an XML layout resource to load  e g   R layout main page  root  Optional view to be the parent of the generated hierarchy  if attachToRoot is true   or else simply an object that provides a set of LayoutParams values for root of the returned hierarchy  if attachToRoot is false   attachToRoot  Whether the inflated hierarchy should be attached to the root parameter  If false  root is only used to create the correct subclass of LayoutParams for the root view in the XML  Returns  The root View of the inflated hierarchy  If root was supplied and attachToRoot is true  this is root  otherwise it is the root of the inflated XML file     Now for the sample layout and code   Main layout  main xml     lt  xml version  1 0  encoding  utf-8   gt   lt LinearLayout xmlns android  http   schemas android com apk res android      android id    id container      android layout width  match parent      android layout height  match parent  gt   lt  LinearLayout gt    Added into this container is a separate TextView  visible as small red square if layout parameters are successfully applied from XML  red xml     lt  xml version  1 0  encoding  utf-8   gt   lt TextView xmlns android  http   schemas android com apk res android      android layout width  25dp      android layout height  25dp      android background   ff0000      android text  red    gt    Now LayoutInflater is used with several variations of call parameters  public class InflaterTest extends Activity        private View view        Override     public void onCreate Bundle savedInstanceState          super onCreate savedInstanceState          setContentView R layout main         ViewGroup parent    ViewGroup  findViewById R id container             result  layout height wrap content layout width match parent       view   LayoutInflater from this  inflate R layout red  null         parent addView view             result  layout height 100 layout width 100       view   LayoutInflater from this  inflate R layout red  null         parent addView view  100  100             result  layout height 25dp layout width 25dp          view textView due to attachRoot false       view   LayoutInflater from this  inflate R layout red  parent  false         parent addView view             result  layout height 25dp layout width 25dp           parent addView not necessary as this is already done by attachRoot true          view root due to parent supplied as hierarchy root and attachRoot true       view   LayoutInflater from this  inflate R layout red  parent  true             The actual results of the parameter variations are documented in the code   SYNOPSIS  Calling LayoutInflater without specifying root leads to inflate call ignoring the layout parameters from the XML  Calling inflate with root not equal null and attachRoot true does load the layout parameters  but returns the root object again  which prevents further layout changes to the loaded object  unless you can find it using findViewById     The calling convention you most likely would like to use is therefore this one   loadedView   LayoutInflater from context                   inflate R layout layout to load  parent  false     To help with layout issues  the Layout Inspector is highly recommended

User · Answer

wanna add to main answer above
I tried to follow it but my recyclerView began to stretch every item to a screen
I had to add next line after inflating for reach to goal

itemLayoutView.setLayoutParams(new RecyclerView.LayoutParams(RecyclerView.LayoutParams.MATCH_PARENT, RecyclerView.LayoutParams.WRAP_CONTENT));

I already added these params by xml but it didnot work correctly
and with this line all is ok

[android] Why does LayoutInflater ignore the layout_width and layout_height layout parameters I've specified?

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