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android - Get back to a fragment from an Activity

I have three fragment in an Activity C. they are behaving as tabs. I have to go from a fragment to a new Activity X. Now i want to come back to fragment from Activity X.

I have override onBackPressed but don't know how to go back to fragment/not fragmentActivity from an Activity.

if i want to go back to an Activity to another activity i override on back pressed and using intent call that actvity..

i want to do some thing like this .. this code is for coming back to previous activity

@Override
public void onBackPressed()
{

    Intent intent = new Intent(CurrentActivity.this,ActivityYouLikeToGo.class);

    intent.addFlags(Intent.FLAG_ACTIVITY_REORDER_TO_FRONT);

    startActivity(intent);
}

thanks in Advance..

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First, Override the back press to goto the activity where the fragments are :-

@Override
public void onBackPressed()
{

    Intent intent = new Intent(CurrentActivity.this,ActivityYouLikeToGo.class);

    intent.putExtra("Check",1);
    startActivity(intent);
}

then goto the ActivityYouLikeToGo.java file and in onCreate do this:-

Intent intent = getIntent();
String s1 = intent.getStringExtra("Check");

if(s1.equals("1"))
  {
s1 = "";
Fragment fragment = new YOURFRAMENTNAME();
if (fragment != null) {
            FragmentManager fragmentManager = getFragmentManager();
            fragmentManager.beginTransaction()
                    .replace(R.id.frame_container, fragment).commit();
  }
}

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