How to catch a click event on a button

Question

NET Developer here just getting started with Eclipse and Android   Can someone show me in the simplest way possible  with the absolute fewest lines of code  how to DO something when a button is clicked   My button has id button1 and I just want to see where how to write the onClick   handler   So let s say I have imageview1 set to invisible  How would I make it visible when the button is clicked   EDIT   Thanks everyone  but since not a single one of your examples work for me  I ll try this  Can someone please post the ENTIRE code to make this work  Not just the method  because when I try to use ANY of your methods I get errors all over the place so obviously something else is missing  I need to see everything  beginning with all the imports

User · Answer

Just declare a method e g if ur button id is button1 then   button1 setOnClickListener new View OnClickListener             Override         public void onClick View v                   TODO Auto-generated method stub             Toast makeText Context   Hello   Toast LENGTH SHORT  show                        If you want to make the imageview1 visible then in that method write   imageview1 setVisibility ImageView VISIBLE

User · Answer

Change your onCreate to    Override protected void onCreate Bundle savedInstanceState        super onCreate savedInstanceState     for me this update worked

User · Answer

You can just do it in your Activity s onCreate   method  For example   public void onCreate Bundle savedInstanceState        super onCreate savedInstanceState       setContentView R layout main          Assign the button to a variable     Button button1    Button findViewById R id button1          Assign the ImageView to a final variable  so that it s       accessible from an inner class     ImageView imageView    ImageView findViewById R id imageview1          Assign it a new OnClickListener     button1 setOnClickListener new OnClickListener              Override         public void onClick View v                imageView setVisibility View VISIBLE

User · Answer

The absolutely best way  Just let your activity implement View OnClickListener  and write your onClick method like this   public void onClick View v        final int id   v getId        switch  id        case R id button1             your code for button1 here         break      case R id button2             your code for button2 here         break         even more buttons here           Then  in your XML layout file  you can set the click listeners directly using the attribute android onClick    lt Button     android id    id button1      android onClick  onClick      android layout width  wrap content      android layout height  wrap content      android text  Button 1    gt    That is the most cleanest way of how to do it  I use it in all of mine projects today  as well

User · Answer

src com example MyClass java  package com example  import android app Activity  import android os Bundle  import android view View  import android view View OnClickListener  import android widget Button  import android widget ImageView   public class MyClass extends Activity       Override   public void onCreate Bundle savedInstanceState          super onCreate savedInstanceState       setContentView R layout main            Button button    Button  findViewById R id button1        button setOnClickListener new OnClickListener               public void onClick View v                   ImageView iv    ImageView  findViewById R id imageview1            iv setVisibility View VISIBLE                             res layout 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  gt       lt Button        android text  Button        android id    id button1        android layout width  wrap content         android layout height  wrap content        gt       lt ImageView        android src   drawable image         android layout height  wrap content         android layout width  wrap content         android id    id imageview1        android visibility  invisible        gt   lt  LinearLayout gt

User · Answer

Taken from  http   developer android com guide topics ui ui-events html     Create an anonymous implementation of OnClickListener private OnClickListener mCorkyListener   new OnClickListener         public void onClick View v             do something when the button is clicked           protected void onCreate Bundle savedValues                   Capture our button from layout     Button button    Button findViewById R id corky          Register the onClick listener with the implementation above     button setOnClickListener mCorkyListener

User · Answer

All answers are based on anonymous inner class  We have one more way for adding click event for buttons as well as other components too   An activity needs to implement View OnClickListener interface and we need to override the onClick function  I think this is best approach compared to using anonymous class   package com pointerunits helloworld   import android os Bundle  import android app Activity  import android util Log  import android view Menu  import android view View  import android view View OnClickListener  import android widget Button   public class MainActivity extends Activity implements OnClickListener      private Button login       Override    protected void onCreate Bundle savedInstanceState          super onCreate savedInstanceState         setContentView R layout activity main         login    Button findViewById R id loginbutton         login setOnClickListener  OnClickListener  this         Log i DISPLAY SERVICE   Activity is created                   Override    public boolean onCreateOptionsMenu Menu menu           getMenuInflater   inflate R menu main  menu         return true             Override    public void onClick View v         Log i DISPLAY SERVICE   Button clicked       v getId

[android] How to catch a click event on a button?

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