How to start new activity on button click

Question

In an Android application  how do you start a new activity  GUI  when a button in another activity is clicked  and how do you pass data between these two activities

User · Answer

Place button widget in xml like below   lt Button     android id    id button      android layout width  wrap content      android layout height  wrap content      android text  Button    gt    After that initialise and handle on click listener in Activity like below     In Activity On Create method    Button button   Button  findViewById R id button    button setOnClickListener new View OnClickListener          Override     public void onClick View view           Intent intent   new              Intent CurrentActivity this DesiredActivity class               startActivity intent

User · Answer

An old question but if the goal is to switch displayed pages  I just have one activity and call setContentView   when I want to switch pages  usually in response to user clicking on a button    This allows me to simply call from one page s contents to another   No Intent insanity of extras parcels bundles and whatever trying to pass data back and forth  I make a bunch of pages in res layout as usual but don t make an activity for each   Just use setContentView   to switch them as needed  So my one-and-only onCreate   has  protected void onCreate Bundle savedInstanceState        super onCreate savedInstanceState        LayoutInflater layoutInflater   getLayoutInflater         final View mainPage   layoutInflater inflate R layout activity main  null       setContentView  mainPage       Button openMenuButton   findViewById R id openMenuButton        final View menuPage   layoutInflatter inflate R layout menu page  null       Button someMenuButton   menuPage findViewById R id someMenuButton        openMenuButton setOnClickListener new View OnClickListener             public void onClick View v                setContentView menuPage                          someMenuButton setOnClickListener new View OnClickListener             public void onClick View v                do-something-interesting              setContentView mainPage                      If you want the Back button to go back through your internal pages before exiting the app  just wrap setContentView   to save pages in a little Stack of pages  and pop those pages in onBackPressed   handler

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your button xml    lt Button     android id  quot   id btn quot      android layout width  quot wrap content quot      android layout height  quot wrap content quot      android text  quot jump to activity b quot        gt   Mainactivity java   Button btn findViewVyId R id btn   btn setOnClickListener btnclick   btnclick setOnClickListener new View OnClickListener          Override     public void onClick View v                   Intent intent new Intent                    intent setClass Mainactivity this b class                   startActivity intent

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From the sending Activity try the following code       EXTRA MESSAGE is our key and it s value is  packagename MESSAGE      public static final String EXTRA MESSAGE    packageName MESSAGE         Override     protected void onCreate Bundle savedInstanceState                           Here we declare our send button         Button sendButton    Button  findViewById R id send button           sendButton setOnClickListener new View OnClickListener                  Override             public void onClick View v                      declare our intent object which takes two parameters  the context and the new activity name                     the name of the receiving activity is declared in the Intent Constructor                 Intent intent   new Intent getApplicationContext    NameOfReceivingActivity class                    String sendMessage    hello world                    put the text inside the intent and send it to another Activity                 intent putExtra EXTRA MESSAGE  sendMessage                     start the activity                 startActivity intent                    From the receiving Activity try the following code      protected void onCreate Bundle savedInstanceState       use the getIntent  method to receive the data from another activity  Intent intent   getIntent       extract the string  with the getStringExtra method String message   intent getStringExtra NewActivityName EXTRA MESSAGE     Then just add the following code to the AndroidManifest xml file    android name  packagename NameOfTheReceivingActivity    android label  Title of the Activity    android parentActivityName  packagename NameOfSendingActivity

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Start another activity from this activity and u can pass parameters via Bundle Object also   Intent intent   new Intent getBaseContext    YourActivity class   intent putExtra  USER NAME    xyz gmail com    startActivity intent     Retrive data in another activity  YourActivity   String s   getIntent   getStringExtra  USER NAME

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In Kotlin   you can do as    In First Activity  let in activity layout there is button which has id as button  Suppose I have to  pass data as String type from one activity to another          val btn   findViewById lt Button gt  R id button       btn setOnClickListener           val intent   Intent baseContext  SecondActivity  class java  apply                putExtra  quot KEY quot   data                    startActivity intent             In Second Activity  you can get data from another activity as  val name   intent getStringExtra  quot KEY quot        Suppose you have to pass a Custom Object then it should be Parcelable  let there is class Collage type which I have to pass from one activity to another    import android os Parcelable import kotlinx android parcel Parcelize   Parcelize class Collage val name  String  val mobile  String  val email  String    Parcelable     Activity First    let here data is Collage type  which I have to pass to another activity     val btn   findViewById lt Button gt  R id button           btn setOnClickListener               val intent   Intent baseContext  SecondActivity  class java  apply                    putExtra  quot KEY quot   data                            startActivity intent                 then from second Activity we will get as val item   intent extras  getParcelable lt Collage gt   quot KEY quot

User · Answer

Try this simple method   startActivity new Intent MainActivity this  SecondActivity class

User · Answer

Implement the View OnClickListener interface and override the onClick method   ImageView btnSearch     Override     protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout activity search1           ImageView btnSearch    ImageView  findViewById R id btnSearch           btnSearch setOnClickListener this           Override     public void onClick View v            switch  v getId                  case R id btnSearch                    Intent intent   new Intent Search this SearchFeedActivity class                   startActivity intent                   break

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When button is clicked   loginBtn setOnClickListener new View OnClickListener          Override     public void onClick View view            Intent intent  new Intent getApplicationContext    NextActivity class           intent putExtra  data   value     pass data         startActivity intent               To received the extra data from NextActivity class    Bundle extra   getIntent   getExtras    if  extra    null       String str    String  extra get  data       get a object

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Intent i   new Intent firstactivity this  secondactivity class   startActivity i

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Although proper answers have been already provided but I am here for searching the answer in language Kotlin  This Question is not about language specific so I am adding the code to accomplish this task in Kotlin language    Here is how you do this in Kotlin for andorid   testActivityBtn1 setOnClickListener        val intent   Intent applicationContext MainActivity  class java        startActivity intent

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Easy   Intent myIntent   new Intent CurrentActivity this  NextActivity class   myIntent putExtra  key   value     Optional parameters CurrentActivity this startActivity myIntent     Extras are retrieved on the other side via    Override protected void onCreate Bundle savedInstanceState        Intent intent   getIntent        String value   intent getStringExtra  key      if it s a string you stored      Don t forget to add your new activity in the AndroidManifest xml    lt activity android label   string app name  android name  NextActivity   gt

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The way to start new activities is to broadcast an intent  and there is a specific kind of intent that you can use to pass data from one activity to another  My recommendation is that you check out the Android developer docs related to intents  it s a wealth of info on the subject  and has examples too

User · Answer

Emmanuel    I think the extra info should be put before starting the activity otherwise the data won t be available yet if you re accessing it in the onCreate method of NextActivity       Intent myIntent   new Intent CurrentActivity this  NextActivity class    myIntent putExtra  key   value    CurrentActivity this startActivity myIntent

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Take Button in xml first      lt Button         android id    id pre          android layout width  wrap content          android layout height  wrap content          android background   mipmap ic launcher          android text  Your Text            gt    Make listner of button    pre setOnClickListener new View OnClickListener              Override         public void onClick View v                Intent intent   new Intent MainActivity this  SecondActivity class               startActivity intent

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Intent iinent  new Intent Homeactivity this secondactivity class   startActivity iinent

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You can try this code   Intent myIntent   new Intent    FirstActivity this SecondActivity myIntent

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When user clicks on the button  directly inside the XML like that     lt Button          android id    id button           android layout width  wrap content           android layout height  wrap content           android text  TextButton           android onClick  buttonClickFunction   gt    Using the attribute android onClick we declare the method name that has to be present on the parent activity  So I have to create this method inside our activity like that   public void buttonClickFunction View v                Intent intent   new Intent getApplicationContext    Your Next Activity class               startActivity intent

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Write the code in your first activity         button setOnClickListener new View OnClickListener                      Override                 public void onClick View view      Intent intent   new Intent MainActivity this  SecondAcitvity class                            You can use String  arraylist  integer  float and all data type                         intent putExtra  Key   value                           startActivity intent                           finish                                 In secondActivity class  String name   getIntent   getStringExtra  Key

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Kotlin First Activity startActivity Intent this  SecondActivity  class java     putExtra  quot key quot    quot value quot     Second Activity val value   getIntent   getStringExtra  quot key quot    Suggestion Always put keys in constant file for more managed way  companion object       val PUT EXTRA USER    quot user quot    startActivity Intent this  SecondActivity  class java     putExtra PUT EXTRA USER   quot value quot

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Create an intent to a ViewPerson activity and pass the PersonID  for a database lookup  for example    Intent i   new Intent getBaseContext    ViewPerson class                         i putExtra  PersonID   personID   startActivity i     Then in ViewPerson Activity  you can get the bundle of extra data  make sure it isn t null  in case if you sometimes don t pass data   then get the data   Bundle extras   getIntent   getExtras    if extras   null         personID   extras getString  PersonID        Now if you need to share data between two Activities  you can also have a Global Singleton   public class YourApplication extends Application              public SomeDataClass data   new SomeDataClass        Then call it in any activity by   YourApplication appState     YourApplication this getApplication     appState data CallSomeFunctionHere       Do whatever you need to with data here   Could be setter getter or some other type of logic

User · Answer

Starting an activity from another activity is very common scenario among android applications  To start an activity you need an Intent object  How to create Intent Objects  An intent object takes two parameter in its constructor  Context Name of the activity to be started   or full package name    Example    So for example if you have two activities  say HomeActivity and DetailActivity and you want to start DetailActivity from HomeActivity     HomeActivity-- gt DetailActivity   Here is the code snippet which shows how to start DetailActivity from  HomeActivity   Intent i   new Intent HomeActivity this DetailActivity class   startActivity i    And you are done   Coming back to button click part   Button button    Button  findViewById R id someid    button setOnClickListener new View OnClickListener                 Override      public void onClick View view             Intent i   new Intent HomeActivity this DetailActivity class            startActivity i

User · Answer

The Most simple way to open activity on button click is    Create two activities under the res folder  add a button to the first activity and give a name to onclick function    There should be two java files for each activity    Below is the code    MainActivity java  import android support v7 app AppCompatActivity  import android os Bundle  import android view View  import android widget TextView  import android content Intent  public class MainActivity extends AppCompatActivity        Override     protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout activity main              public void goToAnotherActivity View view            Intent intent   new Intent this  SecondActivity class           startActivity intent             SecondActivity java  package com example myapplication  import android app Activity  import android os Bundle  public class SecondActivity extends Activity        Override     protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout activity1             AndroidManifest xml Just add this block of code to the existing     lt  activity gt           lt activity android name   SecondActivity  gt     lt  activity gt

User · Answer

Intent in   new Intent getApplicationContext   SecondaryScreen class           startActivity in        This is an explicit intent to start secondscreen activity

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Current responses are great but a more comprehensive answer is needed for beginners  There are 3 different ways to start a new activity in Android  and they all use the Intent class  Intent   Android Developers     Using the onClick attribute of the Button   Beginner  Assigning an OnClickListener   via an anonymous class   Intermediate   Activity wide interface method using the switch statement   Pro    Here s the link to my example if you want to follow along     1  Using the onClick attribute of the Button   Beginner   Buttons have an onClick attribute that is found within the  xml file     lt Button     android id    id button1      android layout width  wrap content      android layout height  wrap content      android onClick  goToAnActivity      android text  to an activity    gt    lt Button     android id    id button2      android layout width  wrap content      android layout height  wrap content      android onClick  goToAnotherActivity      android text  to another activity    gt    In Java class    Override protected void onCreate Bundle savedInstanceState        super onCreate savedInstanceState       setContentView R layout main activity      public void goToAnActivity View view        Intent intent   new Intent this  AnActivity class       startActivity intent      public void goToAnotherActivity View view        Intent intent   new Intent this  AnotherActivity class       startActivity intent       Advantage  Easy to make on the fly  modular  and can easily set multiple onClicks to the same intent    Disadvantage  Difficult readability when reviewing    2  Assigning an OnClickListener   via an anonymous class   Intermediate   This is when you set a separate setOnClickListener   to each button and override each onClick   with its own intent       In Java class     Override protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout main activity            Button button1    Button  findViewById R id button1           button1 setOnClickListener new View OnClickListener                  Override             public void onClick View view                    Intent intent   new Intent view getContext    AnActivity class                   view getContext   startActivity intent                             Button button2    Button  findViewById R id button2           button2 setOnClickListener new View OnClickListener                  Override             public void onClick View view                    Intent intent   new Intent view getContext    AnotherActivity class                   view getContext   startActivity intent                      Advantage  Easy to make on the fly    Disadvantage  There will be a lot of anonymous classes which will make readability difficult when reviewing    3  Activity wide interface method using the switch statement   Pro   This is when you use a switch statement for your buttons within the onClick   method to manage all the Activity s buttons    In Java class    Override protected void onCreate Bundle savedInstanceState        super onCreate savedInstanceState       setContentView R layout main activity        Button button1    Button  findViewById R id button1       Button button2    Button  findViewById R id button2       button1 setOnClickListener this       button2 setOnClickListener this       Override public void onClick View view        switch  view getId             case R id button1              Intent intent1   new Intent this  AnActivity class               startActivity intent1               break          case R id button2              Intent intent2   new Intent this  AnotherActivity class               startActivity intent2               break          default              break          Advantage  Easy button management because all button intents are registered in a single onClick   method    For the second part of the question  passing data  please see How do I pass data between Activities in Android application

[android] How to start new activity on button click

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