startactivityforresult example in android

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startActivityForResult method helps to send data to another activity, get data from another activity or even wait for the result from another activity to perform certain action/ process the result data.

The process involved are,

• Consider there are two activities - MainActivity.java and SecondActivity.java, the main activity calls the second activity and waits for the result like shown below, 

Intent intent=new Intent(MainActivity.this,SecondActivity.class);       

startActivityForResult(intent, 2);

•  Now the SecondActivity performs the required operations(if any) and returns the result like shown below

Intent intent=new Intent();      

intent.putExtra("MESSAGE","your message to FirstActivity ");                   

setResult(2,intent);

• Now we should override the onActivityResult method inside MainActivity which gets automatically invoked once the results from the SecondActivity are returned. It is overidden like shown below

          @Override  

          protected void onActivityResult(int requestCode, int resultCode, Intent data)  
          {
                 super.onActivityResult(requestCode, resultCode, data);  
                   if(requestCode==2)  
                         {
                            String message=data.getStringExtra("MESSAGE");   
                         }
          }  

• Finally you can now access the message send from the SecondActivity using the  String "message" 

Now let us look into a working example. In this example, we will be passing a message from an editext field inside the SecondActivity.java to a texview field in MainActivity.java . So first of all create a new android studio project and make the following changes to your activity_main.xml file
As shown above we have created a button to call the second activity and also added a textview to display the result from second activity. Now we need to call the second activity and wait for result as shown below :
As shown above we have used startActivityForResult to start the second activity so that we we will get the result from the second activity in the callback method - onActivityResult
Now create new activity and name it as SecondActivity.java . Create an edittext field to type the message and also add a button to send the message
Now you may update the SecondActivity.java like this