onActivityResult 将数据从片段返回到活动

Question

I Have an activity A that opens an activity B using startActivityForResult .

Now in activity B it's an activity fragment holder as well it contains an ActionBar with menu items.

Now whenever I press action bar button in activity B it should return data from selected fragment of an activity B not to its holder instead it should return data to activity A because it's the one who did the launch.

So it's basically passing data fragment (inside activity B) to activity B then to Activity A.

I am trying hopelessly to find a way to solve it. Is there any possible way to do it?

Answer 1

Disclaimer there are many ways, this is the one I prefer, not the best ever and not the perfect one, I just like this.

The easiest way, in my opinion, is to pass the data from Fragment inside B to ActivityB, then from ActivityB to ActivityA.

Step 1 to pass data from Fragment to container activity you have many ways; the one I usually use is to use an Interface:

Create interface for ActivityB

public interface IActivityB {
    void setDataAAndFinish(whateverType data);
}

Implement interface in your activityB

public class InterventoActivity extends AppCompatActivity implements IInterventoActivity {

    @Override
    protected void onResume() {
        super.onResume();
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    private Bundle dataA = null;
    @Override
    public void setDataAAndFinish(whateverType data) {
        dataA = data;
        Intent intent = new Intent();
        intent.putExtra("data", data)
        setResult(RESULT_OK, intent);        
        finish();
    }
}

Set activityA to request and accept return from ActivityB

first, start activityB for result and not normally

Intent i = new Intent(this, ActivityB.class);
startActivityForResult(i, 1);

Then read result

public void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    if (requestCode == 1) {
         if(resultCode == RESULT_OK) {
             whateverType data = data.getStringExtra("data");
         }     
    }
} 

Now from fragment

((IActivityB)getActivity()).setDataAAndFinish(myDatas);

Answer 2

You need to declare a function in your ActivityB like the following.

public void sendDataBackToActivityA(String dataToBePassedToActivityA) {
    Intent intent = new Intent();
    intent.putExtra("data", dataToBePassedToActivityA);
    setResult(RESULT_OK, intent);
    finish();
}

Now from the Fragment that you launched from ActivityB , just call the method on some action in your Fragment that was launched from ActivityB . So the pseudo implementation of the process in your Fragment should look like the following. Declare this function in your Fragment and invoke the function on some action in your Fragment .

public void sendDataToActivityAFromFragment(String dataToBePassed) {
    ((ActivityB)getActivity()).sendDataBackToActivityA(dataToBePassed);
}

This will serve your purpose I hope.

Answer 3

You can declare static variables in your A activity and set it from the B activity

Or you can make static class and set variables values from B Activity and get it in A activity

Or you can send the menu value from Activity B to A while you exit Activity B and start activity A by using bundle

Answer 4

this is how you set the data to be passed to activity A in activity B

  val resultIntent = Intent()
        resultIntent.putExtra(DATA, "closed")
        setResult(Activity.RESULT_OK, resultIntent)
        finish()

this is how you get data in activity A

override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
            super.onActivityResult(requestCode, resultCode, data)
            if (requestCode == FILE_UPLOAD_CODE) {
                when (resultCode) {
                    Activity.RESULT_OK -> {
                                      // data here is obtained data of the method paramater
                     }}}}

Answer 5

In your Activity A.Move from activity A to b like this:-

int YOUR_CODE=101;  // it can be whatever you like
Intent i = new Intent(getActivity(), B.class);                   
startActivityForResult(i,YOUR_CODE);

In your Activity B in its fragment

Intent resultIntent = new Intent();
resultIntent.putExtra("NAME OF THE PARAMETER", valueOfParameter);
...
setResult(Activity.RESULT_OK, resultIntent);
finish();

And in your Activity A's onActivityResult() function do this:-

 @Override
 protected void onActivityResult(int requestCode, int resultCode, Intent data) {
     super.onActivityResult(requestCode, resultCode, data);


     if (resultCode == RESULT_OK) {

         if (resultCode==YOUR_CODE)
         {
           String value = (String) data.getExtras().getString("NAME OF THE PARAMETER");  //get Data here

         }

     }

    }

Answer 6

In kotlin: - 
In class A
startActivityForResult(Intent(context, B::class.java), 143)

  override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        if (requestCode == 143) {
            if (data!!.extras.get("check").equals("0")) {
                childpager.currentItem = 0
            }
        }
    }

In Class B
 val intent = Intent()
 intent.putExtra("check", "0")
 setResult(Activity.RESULT_OK, intent)