How to manage startActivityForResult on Android

Question

In my activity  I m calling a second activity from the main activity by startActivityForResult  In my second activity  there are some methods that finish this activity  maybe without a result   however  just one of them returns a result   For example  from the main activity  I call a second one  In this activity  I m checking some features of handset such as does it have a camera  If it doesn t have then I ll close this activity  Also  during the preparation of MediaRecorder or MediaPlayer if a problem happens then I ll close this activity   If its device has a camera and recording is done completely  then after recording a video if a user clicks on the done button then I ll send the result  address of the recorded video  back to the main activity   How do I check the result from the main activity

User · Answer

I will post the new  quot way quot  with androidx in a short answer  because in some case you does not need custom registry or contract   If you want more informations see    https   developer android com training basics intents result Important   there is actually a bug with the backward compatibility of androidx so you have to add fragment version in your gradle file  Otherwise you will get an exception  quot New result API error   Can only use lower 16 bits for requestCode quot   dependencies        def activity version    quot 1 2 0-beta01 quot         Java language implementation     implementation  quot androidx activity activity  activity version quot         Kotlin     implementation  quot androidx activity activity-ktx  activity version quot       def fragment version    quot 1 3 0-beta02 quot         Java language implementation     implementation  quot androidx fragment fragment  fragment version quot         Kotlin     implementation  quot androidx fragment fragment-ktx  fragment version quot         Testing Fragments in Isolation     debugImplementation  quot androidx fragment fragment-testing  fragment version quot     Now you just have to add this member variable of your activity  This use a predefined registry and generic contract  public class MyActivity extends AppCompatActivity                          Activity callback API                 https   developer android com training basics intents result     private ActivityResultLauncher lt Intent gt  mStartForResult   registerForActivityResult new ActivityResultContracts StartActivityForResult                 new ActivityResultCallback lt ActivityResult gt                        Override                 public void onActivityResult ActivityResult result                        switch  result getResultCode                              case Activity RESULT OK                              Intent intent   result getData                                   Handle the Intent                             Toast makeText MyActivity this   quot Activity returned ok quot   Toast LENGTH SHORT  show                                break                          case Activity RESULT CANCELED                              Toast makeText MyActivity this   quot Activity canceled quot   Toast LENGTH SHORT  show                                break                                                           Before new API you had   btn setOnClickListener new View OnClickListener                   Override             public void onClick View v                    Intent intent   new Intent MyActivity  this  EditActivity class                   startActivityForResult intent  Constants INTENT EDIT REQUEST CODE                              You may notice that the request code is now generated  and holded  by the google framework  Your code become   btn setOnClickListener new View OnClickListener                           Override                 public void onClick View v                        Intent intent   new Intent MyActivity  this  EditActivity class                       mStartForResult launch intent                                      Hope my answer will help some people

User · Answer

First you use startActivityForResult   with parameters in first Activity and if you want to send data from second Activity to first Activity then pass value using Intent with setResult   method and get that data inside onActivityResult   method in first Activity

User · Answer

startActivityForResult    Deprecated in androidx  For New way we have registerForActivityResult  In Java       You need to create lanucher variable inside onAttach or onCreate or global  i e  before the activity is displayed  ActivityResultLauncher lt Intent gt  launchSomeActivity   registerForActivityResult       new ActivityResultContracts StartActivityForResult         new ActivityResultCallback lt ActivityResult gt                     Override               public void onActivityResult ActivityResult result                       if  result getResultCode      Activity RESULT OK                             Intent data   result getData                                your operation                                                                 public void openYourActivity                 Intent intent   new Intent this  SomeActivity class               launchSomeActivity launch intent            In Kotlin   var resultLauncher   registerForActivityResult StartActivityForResult      result - gt      if  result resultCode    Activity RESULT OK            val data  Intent    result data            your operation             fun openYourActivity         val intent   Intent this  SomeActivity  class java      resultLauncher launch intent     New way is reduce complexity which we faced when we call activity from fragment or from another activity

User · Answer

The ActivityResultRegistry is the recommended approach ComponentActivity now provides an ActivityResultRegistry that lets you handle the startActivityForResult   onActivityResult   as well as requestPermissions   onRequestPermissionsResult   flows without overriding methods in your Activity or Fragment  brings increased type safety via ActivityResultContract  and provides hooks for testing these flows  It is strongly recommended to use the Activity Result APIs introduced in AndroidX Activity 1 2 0-alpha02 and Fragment 1 3 0-alpha02  Add this to your build gradle def activity version    quot 1 2 0-beta01 quot      Java language implementation implementation  quot androidx activity activity  activity version quot     Kotlin implementation  quot androidx activity activity-ktx  activity version quot   How to use the pre-built contract  This new API has the following pre built functionalities  TakeVideo PickContact GetContent GetContents OpenDocument OpenDocuments OpenDocumentTree CreateDocument Dial TakePicture RequestPermission RequestPermissions  An example that uses takePicture contract  private val takePicture   prepareCall ActivityResultContracts TakePicture      bitmap  Bitmap  - gt         Do something with the Bitmap  if present        override fun onCreate savedInstanceState  Bundle         super onCreate savedInstanceState      setContentView R layout activity main           button setOnClickListener   takePicture        So what   s going on here  Let   s break it down slightly  takePicture is just a callback which returns a nullable Bitmap - whether or not it   s null depends on whether or not the onActivityResult process was successful  prepareCall then registers this call into a new feature on ComponentActivity called the ActivityResultRegistry - we   ll come back to this later  ActivityResultContracts TakePicture   is one of the built-in helpers which Google have created for us  and finally invoking takePicture actually triggers the Intent in the same way that you would previously with Activity startActivityForResult intent  REQUEST CODE   How to write a custom contract  Simple contract that takes an Int as an Input and returns a String that requested Activity returns in the result Intent  class MyContract   ActivityResultContract lt Int  String gt           companion object           const val ACTION    quot com myapp action MY ACTION quot          const val INPUT INT    quot input int quot          const val OUTPUT STRING    quot output string quot             override fun createIntent input  Int   Intent           return Intent ACTION               apply   putExtra INPUT INT  input               override fun parseResult resultCode  Int  intent  Intent    String            return when  resultCode                Activity RESULT OK - gt  intent  getStringExtra OUTPUT STRING              else - gt  null                    class MyActivity   AppCompatActivity          private val myActionCall   prepareCall MyContract      result - gt          Log i  quot MyActivity quot    quot Obtained result   result quot              override fun onCreate savedInstanceState  Bundle             super onCreate savedInstanceState                      button setOnClickListener               myActionCall 500                     Check this official documentation for more info

User · Answer

Very common problem in android It can be broken down into 3 Pieces 1   start Activity B  Happens in Activity A  2   Set requested data   Happens in activity B  3   Receive requested data  Happens in activity A                1  startActivity B   Intent i   new Intent A this  B class   startActivity i        2  Set requested data   In this part  you decide whether you want to send data back or not when a particular event occurs  Eg  In activity B there is an EditText and two buttons b1  b2  Clicking on Button b1 sends data back to activity A Clicking on Button b2 does not send any data    Sending data   b1      clickListener      Intent resultIntent   new Intent       resultIntent putExtra  Your key   Your value       setResult RES CODE A resultIntent      finish        Not sending data  b2      clickListener              setResult RES CODE B new Intent            finish            user clicks back button By default  the result is set with Activity RESULT CANCEL response code          3  Retrieve result   For that override onActivityResult method   Override protected void onActivityResult int requestCode  int resultCode  Intent data    super onActivityResult requestCode  resultCode  data    if  resultCode    RES CODE A             b1 was clicked     String x   data getStringExtra  RES CODE A       else if resultCode    RES CODE B          b2 was clicked    else        back button clicked

User · Answer

You need to override Activity onActivityResult     Override protected void onActivityResult int requestCode  int resultCode  Intent data    super onActivityResult requestCode  resultCode  data    if  resultCode    RESULT CODE ONE         String a   data getStringExtra  RESULT CODE ONE       else if resultCode    RESULT CODE TWO          b was clicked    else

User · Answer

How to check the result from the main activity    You need to override Activity onActivityResult   then check its parameters     requestCode identifies which app returned these results  This is defined by you when you call startActivityForResult    resultCode informs you whether this app succeeded  failed  or something different data holds any information returned by this app  This may be null

User · Answer

In your Main Activity  Override protected void onCreate Bundle savedInstanceState        super onCreate savedInstanceState       setContentView R layout activity main        findViewById R id takeCam  setOnClickListener new View OnClickListener              Override         public void onClick View view                Intent intent new Intent getApplicationContext   TakePhotoActivity class               intent putExtra  quot Mode quot   quot Take quot                startActivity intent                         findViewById R id selectGal  setOnClickListener new View OnClickListener              Override         public void onClick View view                Intent intent new Intent getApplicationContext   TakePhotoActivity class               intent putExtra  quot Mode quot   quot Gallery quot                startActivity intent                         Override public void onActivityResult int requestCode  int resultCode  Intent data        super onActivityResult requestCode  resultCode  data       In Second Activity to Display private static final int CAMERA REQUEST   1888  private ImageView imageView  private static final int MY CAMERA PERMISSION CODE   100  private static final int PICK PHOTO FOR AVATAR   0   Override protected void onCreate Bundle savedInstanceState        super onCreate savedInstanceState       setContentView R layout activity take photo        imageView findViewById R id imageView        if getIntent   getStringExtra  quot Mode quot   equals  quot Gallery quot                  pickImage              else           if  Build VERSION SDK INT  gt   Build VERSION CODES M                if  checkSelfPermission Manifest permission CAMERA     PackageManager PERMISSION GRANTED                    requestPermissions new String   Manifest permission CAMERA   MY CAMERA PERMISSION CODE                 else                   Intent cameraIntent   new Intent MediaStore ACTION IMAGE CAPTURE                   startActivityForResult cameraIntent  CAMERA REQUEST                                   public void pickImage         Intent intent   new Intent Intent ACTION PICK       intent setType  quot image   quot        startActivityForResult intent  PICK PHOTO FOR AVATAR      Override public void onRequestPermissionsResult int requestCode   NonNull String   permissions   NonNull int   grantResults        super onRequestPermissionsResult requestCode  permissions  grantResults       if  requestCode    MY CAMERA PERMISSION CODE                if  grantResults 0     PackageManager PERMISSION GRANTED                        Intent cameraIntent   new Intent android provider MediaStore ACTION IMAGE CAPTURE               startActivityForResult cameraIntent  CAMERA REQUEST                     else                       Toast makeText this   quot Camera Permission Denied   quot   Toast LENGTH LONG  show                        Override protected void onActivityResult int requestCode  int resultCode  Intent data        super onActivityResult requestCode  resultCode  data       if  requestCode    CAMERA REQUEST  amp  amp  resultCode    Activity RESULT OK            Bitmap photo    Bitmap  data getExtras   get  quot data quot            imageView setImageBitmap photo                 if  requestCode    PICK PHOTO FOR AVATAR  amp  amp  resultCode    Activity RESULT OK                if  data    null                    Log d  quot ABC quot   quot No Such Image Selected quot                    return                            try                   Uri selectedData data getData                    Log d  quot ABC quot   quot Image Pick-Up quot                    imageView setImageURI selectedData                   InputStream inputStream   getApplicationContext   getContentResolver   openInputStream selectedData                   Bitmap bitmap   BitmapFactory decodeStream inputStream                   Bitmap bmp MediaStore Images Media getBitmap getContentResolver   selectedData                 catch  FileNotFoundException e                    e printStackTrace                  catch IOException e

User · Answer

For those who have problem with wrong requestCode in onActivityResult  If you are calling startActivityForResult   from your Fragment  the requestCode is changed by the Activity that owns the Fragment   If you want to get the correct resultCode in your activity try this   Change   startActivityForResult intent  1   To   getActivity   startActivityForResult intent  1

User · Answer

If you want to update the user interface with activity result  you can t to use this runOnUiThread new Runnable      Doing this the UI won t refresh with new value  Instead  you can do this    Override protected void onActivityResult int requestCode  int resultCode  Intent data        super onActivityResult requestCode  resultCode  data        if  resultCode    RESULT CANCELED            return             global lat   data getDoubleExtra  LATITUDE   0       global lng   data getDoubleExtra  LONGITUDE   0       new latlng   true      Override protected void onResume         super onResume         if new latlng                PhysicalTagProperties this setLocation global lat  global lng           new latlng false            This seems silly but works pretty well

User · Answer

Example  To see the entire process in context  here is a supplemental answer  See my fuller answer for more explanation     MainActivity java  public class MainActivity extends AppCompatActivity           Add a different request code for every activity you are starting from here     private static final int SECOND ACTIVITY REQUEST CODE   0        Override     protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout activity main                  Go to Second Activity  button click     public void onButtonClick View view                Start the SecondActivity         Intent intent   new Intent this  SecondActivity class           startActivityForResult intent  SECOND ACTIVITY REQUEST CODE                 This method is called when the second activity finishes      Override     protected void onActivityResult int requestCode  int resultCode  Intent data            super onActivityResult requestCode  resultCode  data               check that it is the SecondActivity with an OK result         if  requestCode    SECOND ACTIVITY REQUEST CODE                if  resultCode    RESULT OK       Activity RESULT OK                     get String data from Intent                 String returnString   data getStringExtra  keyName                        set text view with string                 TextView textView    TextView  findViewById R id textView                   textView setText returnString                                     SecondActivity java  public class SecondActivity extends AppCompatActivity         Override     protected void onCreate Bundle savedInstanceState            super onCreate savedInstanceState           setContentView R layout activity second                  Send text back  button click     public void onButtonClick View view                get the text from the EditText         EditText editText    EditText  findViewById R id editText           String stringToPassBack   editText getText   toString                put the String to pass back into an Intent and close this activity         Intent intent   new Intent            intent putExtra  keyName   stringToPassBack           setResult RESULT OK  intent           finish

User · Answer

From your FirstActivity call the SecondActivity using  startActivityForResult   method  For example   int LAUNCH SECOND ACTIVITY   1 Intent i   new Intent this  SecondActivity class   startActivityForResult i  LAUNCH SECOND ACTIVITY     In your SecondActivity set the data which you want to return back to FirstActivity  If you don t want to return back  don t set any   For example  In SecondActivity if you want to send back data   Intent returnIntent   new Intent    returnIntent putExtra  result  result   setResult Activity RESULT OK returnIntent   finish      If you don t want to return data   Intent returnIntent   new Intent    setResult Activity RESULT CANCELED  returnIntent   finish      Now in your FirstActivity class write following code for the onActivityResult   method    Override protected void onActivityResult int requestCode  int resultCode  Intent data        super onActivityResult requestCode  resultCode  data        if  requestCode    LAUNCH SECOND ACTIVITY            if resultCode    Activity RESULT OK               String result data getStringExtra  result                      if  resultCode    Activity RESULT CANCELED                  Write your code if there s no result                    onActivityResult   To implement passing data between two activities in much better way in Kotlin please go through this link  A better way to pass data between Activities

User · Answer

Complementing the answer from  Nishant the best way to return the activity result is   Intent returnIntent   getIntent    returnIntent putExtra  result  result   setResult RESULT OK returnIntent   finish      I was having problem with  new Intent      Then I found out that the correct way is using   getIntent      to get the current intent

[android] How to manage startActivityForResult on Android?

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