android how to change layout on button click

Question

I have to following code for selecting layout on button click   View OnClickListener handler   new View OnClickListener        public void onClick View v             switch  v getId                   case R id DownloadView                      doStuff                 setContentView R layout main                   break              case R id AppView                      doStuff                 setContentView R layout app                   break                      findViewById R id DownloadView  setOnClickListener handler   findViewById R id AppView  setOnClickListener handler     When I click the  AppView  button  the layout changes  but when I click the  DownloadView  button  nothing happens   This link says that I have to start a new activity   But I don t know how to use the code there of intent to start new activity  will a new file be added   EDIT  I have my code on the new activity   package com example engagiasync   import android app Activity  import android content Intent  import android os Bundle  import android view View  import android view View OnClickListener  import android widget TextView   public class AppView extends Activity implements OnClickListener         Override     public void onCreate Bundle savedInstanceState            setContentView R layout app            TextView tv    TextView  this findViewById R id thetext           tv setText  App View yo   n                Override     public void onClick View v               TODO Auto-generated method stub            but it does not work  it force closes  the logcat says

User · Answer

The logcat shows the error  you should call super onCreate savedInstanceState      Override public void onCreate Bundle savedInstanceState       super onCreate savedInstanceState             your code

User · Answer

Button btnDownload    Button  findViewById R id DownloadView     Button btnApp    Button  findViewById R id AppView      btnDownload setOnClickListener handler     btnApp setOnClickListener handler      View OnClickListener handler   new View OnClickListener       public void onClick View v         if v  btnDownload                   doStuff             Intent intentMain   new Intent CurrentActivity this                                               SecondActivity class               CurrentActivity this startActivity intentMain               Log i  Content     Main layout                if v  btnApp                   doStuff             Intent intentApp   new Intent CurrentActivity this                                             ThirdActivity class                CurrentActivity this startActivity intentApp                Log i  Content     App layout                        Note   and then you should declare all your activities in the manifest  xml file like this      lt activity android name   SecondActivity   gt  lt  activity gt   lt activity android name   ThirdActivity   gt  lt  activity gt    EDIT   update this part of Code          Override public void onCreate Bundle savedInstanceState   super onCreate savedInstanceState     Add THIS LINE      setContentView R layout app        TextView tv    TextView  this findViewById R id thetext       tv setText  App View yo   n        NB   check this  Broken link  Tutorial About How To Switch Between Activities

User · Answer

I think what you re trying to do should be done with multiple Activities  If you re learning Android  understanding Activities is something you re going to have to tackle  Trying to write a whole app with just one Activity will end up being a lot more difficult  Read this article to get yourself started  then you should end up with something more like this   View OnClickListener handler   new View OnClickListener        public void onClick View v             switch  v getId                   case R id DownloadView                      doStuff                 startActivity new Intent ThisActivity this  DownloadActivity class                    break              case R id AppView                      doStuff                 startActivity new Intent ThisActivity this  AppActivity class                    break                      findViewById R id DownloadView  setOnClickListener handler   findViewById R id AppView  setOnClickListener handler

User · Answer

It is very simple  just do this   t4 setOnClickListener new OnClickListener              Override         public void onClick View v                 launchQuiz2                TODO Auto-generated method stub                     private void launchQuiz2                 Intent i   new Intent MainActivity this  Quiz2 class               startActivity i                  TODO Auto-generated method stub

User · Answer

First I would suggest putting a Log in each case of your switch to be sure that your code is being called   Then I would check that the layouts are actually different

User · Answer

I would add an android onClick to the layout and then change the layout in the activity   So in the layout    lt ImageView  Other things like source etc   android onClick  changelayout    gt    Then in the activity add the following   public void changelayout View view       setContentView R layout second layout

User · Answer

You wanted to change the layout at runtime on button click  But that is not possible and as it has been rightly stated above  you need to restart the activity  You will come across a similar problem when u plan on changing the theme based on user s selection but it will not reflect in runtime  You will have to restart the activity

User · Answer

I know I m coming to this late  but what the heck   I ve got almost the exact same code as Kris  using just one Activity but with 2 different layouts views  and I want to switch between the layouts at will   As a test  I added 2 menu options  each one switches the view   public boolean onOptionsItemSelected MenuItem item             switch  item getItemId                  case R id item1                  setContentView R layout main                   return true              case R id item2                  setContentView R layout alternate                   return true              default                  return super onOptionsItemSelected item                     Note  I ve got one Activity class  This works perfectly  So I have no idea why people are suggesting using different Activities   Intents  Maybe someone can explain why my code works and Kris s didn t

[java] android: how to change layout on button click?

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