displaying a string on the textview when clicking a button in android

Question

I m very new to Android development and just started to study   What I m trying is to add a button and when that button is pressed a text  my first project  to get displayed in the text view   With the help of some experts I created the button and text view   So the button is showing in the simulator but when I click that button nothing happens   Can anyone please help me with how can I display the text when pressing the button    xml   lt LinearLayout xmlns android  http   schemas android com apk res android      android layout width  fill parent      android layout height  fill parent      android orientation  vertical   gt        lt TextView         android id    id txtView          android layout width  150dp          android layout height  150dp          android text   string hello    gt        lt Button    android id    id mybtn     android layout width  50dp     android layout height  30dp          gt       lt TextView    android id    id viewwidth     android layout width  fill parent     android layout height  wrap content        gt   lt TextView    android id    id viewheight     android layout width  fill parent     android layout height  wrap content       gt    lt  LinearLayout gt     java  import android app Activity  import android os Bundle  import android widget Button  import android widget TextView  import android view View  import android widget Toast   public class NameonbuttonclickActivity extends Activity implements View OnClickListener       Button mybtn      TextView txtView      String hello          Called when the activity is first created          Override     public void onCreate Bundle savedInstanceState            setContentView R layout main           super onCreate savedInstanceState           mybtn  new Button this           txtView new TextView this           mybtn setOnClickListener this           printmyname             mybtn    Button findViewById R id mybtn           txtView  TextView findViewById R id txtView           txtView    TextView findViewById R id viewwidth           txtView    TextView findViewById R id viewheight            hello  This is my first project              setContentView mybtn             setContentView R layout main              public void onClick View view           txtView setText hello                   printmyname         Toast makeText NameonbuttonclickActivity this  hello  Toast LENGTH LONG  show                                          private void printmyname            System out println  coming

User · Answer

public void onCreate Bundle savedInstanceState         setContentView R layout main       super onCreate savedInstanceState        mybtn    Button findViewById R id mybtn       txtView  TextView findViewById R id txtView        mybtn  setOnClickListener new OnClickListener               Override         public void onClick View v                   TODO Auto-generated method stub             txtView SetText  Your Message

User · Answer

Check this   hello setOnClickListener new OnClickListener          Override     public void onClick View paramView            text setText  hello

User · Answer

This is because you DON T associated the OnClickListener   on the button retrieve from the XML layout   You don t need to create object because they are already created by the Android system when you inflate XML file  with the Activity setContentLayout  int resourceLayoutId   method    Just retrieve them with the findViewById      method

User · Answer

you use this as txtView setText  hello

User · Answer

Just check your code in  java class  You had written below line   mybtn setOnClickListener this     before initializing the mybtn object I mean  mybtn    Button findViewById R id mybtn     just switch this two line or put that line  mybtn setOnClickListener this   after initializing your mybtn object and you will get the answer what you want

User · Answer

MainActivity java   import android app Activity  import android content Intent  import android os Bundle  import android widget Button  import android widget ImageButton  import android widget ImageView  import android widget TextView  import android widget Toast  import android view View  import android view View OnClickListener   public class MainActivity extends Activity        Button button1      TextView textView1       Override     protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout activity main             button1  Button findViewById R id button1            textView1  TextView findViewById R id textView1           button1 setOnClickListener new View OnClickListener                   Override             public void onClick View v                 textView1 setText  TextView displayed Successfully                                         activity main xml    lt  xml version  1 0  encoding  utf-8   gt   lt LinearLayout 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      android orientation  vertical   gt        lt Button         android id    id button1          android layout width  wrap content          android layout height  wrap content          android text  Click here    gt        lt TextView         android id    id textView1          android layout width  wrap content          android layout height  wrap content             gt    lt  LinearLayout gt

User · Answer

You can do like this    String hello  public void onCreate Bundle savedInstanceState        setContentView R layout main       super onCreate savedInstanceState        mybtn    Button findViewById R id mybtn       txtView  TextView findViewById R id txtView       txtwidth    TextView findViewById R id viewwidth       hello  This is my first project         mybtn setOnClickListener this     public void onClick View view       txtView setText hello       Check your textview names  Both are same   You must use different object names and you have mentioned that textview object which is not available in your xml layout file  Hope this will help you

User · Answer

Try this     public void onClick View view       txtView setText  hello           printmyname        Toast makeText NameonbuttonclickActivity this   hello   Toast LENGTH LONG  show        Also in toast use  Hello

User · Answer

First create xml file as follows  Create one textview and a button   main xml   lt  xml version  1 0  encoding  utf-8   gt   lt LinearLayout xmlns android  http   schemas android com apk res android      android layout width  fill parent      android layout height  fill parent      android orientation  vertical   gt      lt TextView     android layout width  fill parent      android layout height  wrap content      android text   string hello    gt      lt Button     android id    id mybutton      android layout width  wrap content      android layout height  wrap content      android text  Click Me    gt      lt TextView     android id    id textView1      android layout width  wrap content      android layout height  wrap content        gt    lt  LinearLayout gt    The first TextView is created by default  You can leave or remove it if you want  Next one is to create a button The next one is TextView where you want to display text   Now coming to the main activity code        package com android example simple   import android app Activity  import android os Bundle  import android view View  import android widget Button  import android widget TextView   public class SimpleActivity extends Activity       Called when the activity is first created      Override   public void onCreate Bundle savedInstanceState        super onCreate savedInstanceState       setContentView R layout main        final TextView textView  TextView findViewById R id textView1       final Button button1     Button findViewById R id mybutton          Implement listener for your button so that when you click the        button  android will listen to it                     button1 setOnClickListener new View OnClickListener                          public void onClick View v                                Perform action on click              textView setText  You clicked the button

[android] displaying a string on the textview when clicking a button in android

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