Android findViewById in Custom View

Question

I ve written my custom View and i want to update some other views after interacting with my custom view   Main Layout    lt  xml version  1 0  encoding  utf-8   gt    lt RelativeLayout xmlns android  http   schemas android com apk res android      xmlns custom  http   schemas android com apk res-auto      android layout width  match parent      android layout height  match parent  gt        lt EditText         android id    id display name          android layout width  wrap content          android layout height  wrap content          android inputType  text          android layout centerHorizontal  true          android tag  name          android ems  10    gt        lt EditText         android layout width  wrap content          android layout height  wrap content          android inputType  number          android ems  10          android id    id id number          android layout centerHorizontal  true          android layout below   id display name   gt        lt ge altasoft custom views IdNumber         android id    id custom id number          android layout width  wrap content          android layout height  wrap content          android layout centerHorizontal  true          android layout below   id id number          android paddingLeft  35dip          custom firstName   id display name   gt   lt  RelativeLayout gt    Custom View Layout    lt  xml version  1 0  encoding  utf-8   gt    lt RelativeLayout     xmlns android  http   schemas android com apk res android      android layout width  wrap content      android layout height  wrap content  gt        lt EditText         android id    id id number custom          android layout width  wrap content          android layout height  wrap content          android inputType  number          android ems  10          android paddingRight  35dip    gt        lt ImageButton         android id    id load data button          android layout width  30dip          android layout height  30dip          android layout centerVertical  true          android src   drawable load data          android layout toRightOf   id id number custom    gt    lt  RelativeLayout gt    Custom View Class  constructor and listener    private int firstNameViewID   public IdNumber  Context context  AttributeSet attrs            super context  attrs           initViews             TypedArray a   context obtainStyledAttributes attrs  R styleable IdNumber           final int N   a getIndexCount            for int i   0  i  lt  N  i                 int attr   a getIndex i               switch attr                   case R styleable IdNumber firstName                      firstNameViewID   a getResourceId attr  -1                       break                                  a recycle              private void initViews             inflater    LayoutInflater  getContext   getSystemService Context LAYOUT INFLATER SERVICE           inflater inflate R layout id number edit text custom  this  true           editText    EditText  findViewById R id id number custom           loadButton    ImageButton  findViewById R id load data button           loadButton setVisibility RelativeLayout INVISIBLE           loadData           private void loadData            loadButton setOnClickListener new OnClickListener                  Override             public void onClick View v                    EditText firstName    EditText  findViewById R id display name                   firstName setText  Some Text                                      The Problem is that  EditText firstName    EditText  findViewById R id display name   returns null   I know that just calling findViewById   will search the view in the layout that i inflated it    If it s possible  how can I get the view of EditText with id  display name from the main layout    Thanks in Advance

User · Answer

Override public View getView int position  View convertView  ViewGroup parent        View row   convertView      ImageHolder holder   null      if  row    null            LayoutInflater inflater     Activity  context  getLayoutInflater            row   inflater inflate layoutResourceId  parent  false           holder   new ImageHolder            editText    EditText  row findViewById R id id number custom           loadButton    ImageButton  row findViewById R id load data button           row setTag holder         else           holder    ImageHolder  row getTag                holder editText setText  Your Value        holder loadButton setImageBitmap  Your Bitmap Value        return row

User · Answer

View Custmv    private void initViews             inflater    LayoutInflater  getContext   getSystemService Context LAYOUT INFLATER SERVICE           Custmv   inflater inflate R layout id number edit text custom  this  true           editText    EditText  findViewById R id id number custom           loadButton    ImageButton  findViewById R id load data button           loadButton setVisibility RelativeLayout INVISIBLE           loadData           private void loadData            loadButton setOnClickListener new OnClickListener                  Override             public void onClick View v                    EditText firstName    EditText  Custmv getParent   findViewById R id display name                   firstName setText  Some Text                                      try like this

User · Answer

You can try something like this   Inside customview constructor   mContext   context    Next inside customview you can call       MainActivity  mContext  updateText  text      Inside MainAcivity define   public void updateText final String text          TextView txtView    TextView  findViewById R id text        txtView setText text       It works for me

User · Answer

Change your Method as following and check it will work  private void initViews         inflater    LayoutInflater  getContext   getSystemService Context LAYOUT INFLATER SERVICE       inflater inflate R layout id number edit text custom  this  true       View view    View  inflater inflate R layout main  null       editText    EditText  view findViewById R id id number custom       loadButton    ImageButton  view findViewById R id load data button       loadButton setVisibility RelativeLayout INVISIBLE       loadData

User · Answer

If it s fixed layout you can do like that   public void onClick View v       ViewGroup parent    ViewGroup  IdNumber this getParent       EditText firstName    EditText  parent findViewById R id display name      firstName setText  Some Text        If you want find the EditText in flexible layout  I will help you later  Hope this help

User · Answer

Try this in your constructor  MainActivity maniActivity    MainActivity context  EditText firstName    EditText  maniActivity findViewById R id display name

[android] Android findViewById() in Custom View

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