Android - Set text to TextView

Question

I m currently learning some android for a school project and I can t figure out the way to set text dynamically to a TextView    Here is my code   protected void onCreate Bundle savedInstanceState        super onCreate savedInstanceState       setContentView R layout activity enviar mensaje       err    TextView findViewById R id texto       err setText  Escriba su mensaje y luego seleccione el canal         This is currently not working and I can t find a way to make it work     Any help will be much appreciated    Thank you for the time  Jos     EDIT  Here is the activity enviar mensaje xml   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  wrap content              tools context   EnviarMensaje   gt               lt TextView         android id    id texto          android layout width  wrap content          android layout height  wrap content          android layout alignLeft    id listaVista          android layout alignParentBottom  true          android layout alignRight    id listaVista          android text  TextView    gt           lt  RelativeLayout gt    By not working I mean the text shown does not change at any moment

User · Answer

Please correct the following line   err    TextView findViewById R id texto     to   err    TextView findViewById R id err

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final TextView err    TextView findViewById R id texto   err setText  Escriba su mensaje y luego seleccione el canal       you can find every thing you need about textview here

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in your activity main xml paste this code                lt TextView                  android id    id name                   android layout width  wrap content                   android layout height  wrap content                   android layout alignParentLeft  true                   android layout alignParentTop  true                   android layout marginLeft  19dp                   android layout marginTop  43dp                   android text   string name    gt    and go to res folder- values- strings xml paste the below code with the code that already exists              lt string name  name  gt Escriba su mensaje y luego seleccione el canal  lt  string gt    the above code means that you have created a textview with id name android id    id name   and assigned that textview to a string with an identifier name android text   string name   in strings xml your using that identifier name to assign the text

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In layout file    lt TextView    android id    id myTextView     android layout width  match parent     android layout height  wrap content     android text  Some Text     android textSize  18sp     android textColor   000000   gt    In Activity  TextView myTextView    TextView findViewById R id myTextView   myTextView setText  Hello World

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This should do the trick   TextView setText  test

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Try This   TextView err    TextView findViewById R id text     Ensure you import TextView

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I know its 2 months but yeah  replace your code  Private TextView err  protected void onCreate Bundle savedInstanceState        super onCreate savedInstanceState       setContentView R layout activity enviar mensaje       err    TextView findViewById R id texto       err setText  Escriba su mensaje y luego seleccione el canal

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You can set string in textview programatically like below   TextView textView    TextView findViewById R id texto   err setText  Escriba su mensaje y luego seleccione el canal       or   TextView textView    TextView findViewById R id texto   err setText getActivity   getResource   getString R string seleccione canal      You can set string in xml like below    lt TextView          android id    id name           android layout width  wrap content           android layout height  wrap content           android layout alignParentLeft  true           android layout alignParentTop  true           android layout marginLeft  19dp           android layout marginTop  43dp           android text  Escriba su mensaje y luego seleccione el canal     gt    or   lt TextView          android id    id name           android layout width  wrap content           android layout height  wrap content           android layout alignParentLeft  true           android layout alignParentTop  true           android layout marginLeft  19dp           android layout marginTop  43dp           android text   string seleccione canal    gt

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In xml use this    lt TextView         android id    id textView         android layout width  wrap content         android layout height  wrap content   gt    In Activity define the view   Textview textView  TextView findViewById R id textView   textView setText getResources   getString R string txt hello      In string file    lt string name  txt hello  gt Hello lt  string gt    Output  Hello

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Well    id listaVista ListView is drawn after   id texto and on top of it  So change in ListView from   android layout below    id editText1    to   android layout above    id texto    Also  since the list is drawn after textview  I find it dangerous to have android layout alignRight    id listaVista  in TextView  So remove it and find another way of aligning    EDIT Taking a second look at your layout I think this is what you really want to have    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  wrap content      android paddingBottom   dimen activity vertical margin      android paddingLeft   dimen activity horizontal margin      android paddingRight   dimen activity horizontal margin      android paddingTop   dimen activity vertical margin      tools context   EnviarMensaje   gt        lt TextView         android id    id textView1          android layout width  wrap content          android layout height  wrap content          android layout alignParentTop  true          android text  Escriba el mensaje y luego clickee el canal a ser enviado          android textSize  20sp    gt        lt EditText         android id    id editText1          android layout width  wrap content          android layout height  wrap content          android layout alignLeft    id textView1          android layout alignRight    id textView1          android layout below    id textView1          android ems  10          android inputType  text    gt        lt TextView         android id    id texto          android layout width  wrap content          android layout height  wrap content          android layout alignLeft    id listaVista          android layout alignParentBottom  true          android text  TextView    gt        lt ListView         android id    id listaVista          android layout width  wrap content          android layout height  wrap content          android layout above    id texto          android layout alignParentLeft  true          android layout below    id editText1   gt       lt  ListView gt    lt  RelativeLayout gt

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As you have given static text   err setText  Escriba su mensaje y luego seleccione el canal      It will not change   it will remain same   Example for Dynamic Text for textview is    MainActivity java package com example dynamictextview   import android app Activity  import android os Bundle  import android view View  import android view View OnClickListener  import android widget Button  import android widget TextView   public class MainActivity extends Activity        int count   0      Button clickMeBtn      TextView dynamicText        Override     protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout activity main            clickMeBtn    Button  findViewById R id button click           dynamicText    TextView  findViewById R id textview            clickMeBtn setOnClickListener new OnClickListener                   Override             public void onClick View v                     count                    dynamicText setText  dynamic text example       count                                         For activity main xml   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      tools context  com example dynamictextview MainActivity   gt        lt Button          android id    id button click         android layout width  wrap content          android layout height  wrap content          android text  click me          android layout centerInParent  true    gt        lt TextView         android id    id textview          android layout width  wrap content          android layout height  wrap content          android text   string hello world           android layout below   id button click          android layout centerHorizontal  true          android textSize  25sp          android layout marginTop  20dp            gt    lt  RelativeLayout gt

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I had a similar problem  It turns out I had two TextView objects with the same ID  They were in different view files and so Eclipse did not give me an error  Try to rename your id in the TextView and see if that does not fix your problem

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In your layout  Your Texto should not contain  android text       I would remove this line  Either keep the Java string OR the  android text

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In XML file    lt TextView        android id    id textview         android layout width  wrap content         android layout height  wrap content         android text  My Name         android textColor   cccccc   gt    In Java Activity file   public class MainActivity1 extends Activity       TextView t1     public void onCreate Bundle onSavedInstance                   setContentView R layout xmlfilename             t1    TextView findViewbyId R id textview

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PUT THIS CODE IN YOUR XML FILE  lt TextView     android id  quot   id textview1 quot      android layout width  quot match parent quot      android layout height  quot wrap content quot   gt   PUT THIS CODE IN YOUR JAVA FILE    Declaring components like TextView globally is a good habit TextView mTextView    TextView  findViewById R id textview1       Put this in OnCreate mTextView setText  quot Welcome to Dynamic TextView quot

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Go to your activityMain and set the text by adding a widget from the widgets section and manually changing text by selecting and typing

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Kotlin Solution  To set using a String  just use this  view text    My string    To do the same with a resource value  add this extension property to much more easily set your text  view textRes   R string my string  var TextView textRes     get     0    HACK  property requires getter     set  StringRes textRes            text   resources getText textRes

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first your should create an object for text view TextView show alter    show alert    TextView findViewById R id show alert   show alert setText  My Awesome Text

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In your layout XML    lt TextView         android id    id myAwesomeTextView          android layout width  wrap content          android layout height  wrap content          android layout alignParentTop  true          android text  Escriba el mensaje y luego clickee el canal a ser enviado          android textSize  20sp    gt    Then  in your activity class      globally  TextView myAwesomeTextView    TextView findViewById R id myAwesomeTextView      in your OnCreate   method myAwesomeTextView setText  My Awesome Text

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Maybe you have assigned the text in onResume   function

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Why don  t you try to assign the textview contents onStart   rather than onCreate

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Your code is ok  you are loading the  xml that contains the TextView using setContentView         setContentView R layout activity enviar mensaje     and then getting the reference of the TextView inside activity enviar mensaje xml  and setting a text    err    TextView findViewById R id texto   err setText  Escriba su mensaje y luego seleccione el canal       The problem is that your TextView is hidden by the ListView

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You should use ButterKnife Library http   jakewharton github io butterknife   And use it like   InjectView R id texto  TextView err    in onCreate method  ButterKnife inject this  err setText  Escriba su mensaje y luego seleccione el canal

[android] Android - Set text to TextView

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