Can not perform this action after onSaveInstanceState when Dialog fragment is dismissed

Question

I am stuck with an issue with DialogFragments. I have an Activity which has a button which onclick shows a progress spinner(DialogFragment with a custom View) and then goes to another activity. In my second Activity I have button2 which onclick would send back a Result to my previous activity which should dismiss the progress spinner.

public class MainActivity extends AppCompatActivity {

private Button button;
private int stackLevel;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    stackLevel=0;

    button = (Button)findViewById(R.id.button);
    button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            showProgressDialog();

            Intent intent = new Intent(MainActivity.this,           SecondActivity.class);
            startActivityForResult(intent,2);
        }
    });


}

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

    if(requestCode==2){

        dismissProgressDialog();

    }

}

public void showProgressDialog() {
    stackLevel++;

    FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
    Fragment prev = getSupportFragmentManager().findFragmentByTag("progressDialog");
    if (prev != null) {
        ft.remove(prev);
    }
    //ft.addToBackStack(null);
    // Create and show the dialog.
    DialogFragment newFragment = LoaderFragment.newInstance(stackLevel);
    //newFragment.show(ft,"progressDialog");
    ft.add(newFragment, "progressDialog");
    ft.commitAllowingStateLoss();
}


public void dismissProgressDialog() {

    FragmentTransaction ft = getSupportFragmentManager().beginTransaction();
    DialogFragment prev = (DialogFragment) getSupportFragmentManager().findFragmentByTag("progressDialog");
    if (prev != null) {
        prev.dismiss();
    }
        ft.commitAllowingStateLoss();
}


 }

Activity 2

public class SecondActivity extends AppCompatActivity {

private Button button;
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.second_layout);

    button = (Button)findViewById(R.id.button2);
    button.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {

            try {
                setResult(2);
            }catch (Exception e){

                e.printStackTrace();
            }


            finish();

        }
    });

}
}

But I am getting following error when I dismiss the dialog fragment

    Caused by: java.lang.IllegalStateException: Can not perform this action     after onSaveInstanceState
 at android.support.v4.app.FragmentManagerImpl.checkStateLoss(FragmentManager.java:1527)
 at android.support.v4.app.FragmentManagerImpl.enqueueAction(FragmentManager.java:1545)
 at android.support.v4.app.BackStackRecord.commitInternal(BackStackRecord.java:654)
 at android.support.v4.app.BackStackRecord.commit(BackStackRecord.java:621)
 at android.support.v4.app.DialogFragment.dismissInternal(DialogFragment.java:201)
 at android.support.v4.app.DialogFragment.dismiss(DialogFragment.java:167)
 at com.example.am46517.samplefragmentapplication.MainActivity.dismissProgressDialog(MainActivity.java:70)
 at com.example.am46517.samplefragmentapplication.MainActivity.onActivityResult(MainActivity.java:42)
 at android.app.Activity.dispatchActivityResult(Activity.java:6926)
 at android.app.ActivityThread.deliverResults(ActivityThread.java:4293)
 at android.app.ActivityThread.handleSendResult(ActivityThread.java:4347) 
 at android.app.ActivityThread.-wrap20(ActivityThread.java)

 

Answer 1

This is a case where DialogFragment is being dismissed in background, therefore it shall be allowed to dismiss only if it is done with dismissAllowingStateLoss() method. But to use this method you need to show this dialog by using supportFragmentManager only, like this: (pardon me, answer is in Kotlin)

gameLoadingDialog = GameLoadingDialog()
gameLoadingDialog?.show(supportFragmentManager, "gameLoadingDialog") 

Then to dismiss this even in background you can use:

val prev = supportFragmentManager.findFragmentByTag("gameLoadingDialog")
if (prev != null && prev is GameLoadingDialog) {
    prev.dismissAllowingStateLoss()
}