How to send data by click back button?

Question

I'm using two activities, MainActivity & SubActivity.

MainActivity.class

public class MainActivity extends AppCompatActivity {
    Button button;

    @Override
    protected void onCreate() {
        ...
        button.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Intent sub = new Intent(this, SubActivity.class);
                sub.putExtra("name", "a");
                startActivity(sub);
            }
        }
    }
}

SubActivity

public class SubActivity extends AppCompatActivity {
    EditText text;
    @Override
    protected void onCreate() {
        ...
        text.setText(getIntent().getStringExtra("name"));
    }

    @Override
    public void onBackPressed() {
       super.onBackPressed();
    }
}

In this case, if I change the text in EditText in SubActivity, I want to send changed text data to MainActivity when back button pressed in SubActivity(It means SubActivity onDestroy()). I don't want to make the second MainActivity like this in SubActivity.

@Override
public void onBackPressed() {
    Intent intent = new Intent (this, MainActivity.class);
    intent.putExtra("name", text.getText().toString());
    startActivity(intent);
}

Is there any way to send text data when SubActivity removed from the activity stack?

Answer 1

  public class MainActivity extends AppCompatActivity {
      Button button;

     @Override
     protected void onCreate() {
      ...
       button.setOnClickListener(new View.OnClickListener() {
          @Override
          public void onClick(View v) {
               Intent sub = new Intent(this, SubActivity.class);
              sub.putExtra("name", "a");
              startActivityForResult(sub , 2);
        }
    }
}
@Override  
   protected void onActivityResult(int requestCode, int resultCode, Intent data)  
   {  
             super.onActivityResult(requestCode, resultCode, data);  
              // check if the request code is same as what is passed  here it is 2  
               if(requestCode==2)  
                     {  
                        String message=data.getStringExtra("name");   
                        textView1.setText(message);  
                     }  
   }  
}

And

      @Override
       public void onBackPressed() {
        Intent intent = new Intent (this, MainActivity.class);
        intent.putExtra("name", text.getText().toString());
        setResult(2,intent);  
    }