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copied!<p>I use support library v4 and Sherlock Actionbar.</p> <p>After some tries with and without BackStack and simplifying the layout of step fragments, I finaly found the reason for the exception.</p> <p>I use a fragment (selction spinner) in my first step fragmen (see XML-layout)</p> <pre><code><?xml version="1.0" encoding="utf-8"?> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" > <TextView android:id="@+id/lbl_report_type" style="@style/wd_field_label" android:layout_alignParentLeft="true" android:layout_alignParentTop="true" android:text="@string/rpz_lbl_report_type" /> <fragment android:id="@+id/frag_report_type_spinner" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_alignParentLeft="true" android:layout_below="@+id/lbl_report_type" class="de.webducer.android.ReportTypeSelectorSpinnerFragment" /> <TextView android:id="@+id/lbl_report_name" style="@style/wd_field_label" android:layout_alignParentLeft="true" android:layout_below="@+id/frag_report_type_spinner" android:text="@string/rpz_lbl_report_name" /> <EditText android:id="@+id/report_name" style="@style/wd_text_edit_pref" android:layout_alignParentLeft="true" android:layout_below="@+id/lbl_report_name" android:hint="@string/rpz_hint_report_name" /> <TextView android:id="@+id/lbl_report_comment" style="@style/wd_field_label" android:layout_alignParentLeft="true" android:layout_below="@+id/report_name" android:text="@string/rpz_lbl_report_comment" /> <EditText android:id="@+id/report_comment" style="@style/wd_text_multi_edit_pref" android:layout_alignParentLeft="true" android:layout_below="@+id/lbl_report_comment" android:hint="@string/rpz_hint_report_comment" /> <TextView android:id="@+id/lbl_active" style="@style/wd_field_label" android:layout_alignParentLeft="true" android:layout_below="@+id/report_comment" android:text="@string/lbl_active" /> <CheckBox android:id="@+id/report_type_active" style="@style/wd_text_edit_pref" android:layout_alignParentLeft="true" android:layout_below="@+id/lbl_active" android:checked="true" android:text="@string/rpz_hint_report_type_active" /> </RelativeLayout> </code></pre> <p>Ithis <strong>inner</strong> fragment produced the exception because the <strong>outer</strong> fragment tries in onCreateView to inflate the <strong>inner</strong> fragment. And this one is already in FragmentManager with the given ID.</p> <p>My solution is now to destroy the <strong>inner</strong> fragment bevore replace with new one or before call from back stack.</p> <pre><code>private void runPrevious(View view) { switch (_CurrentPage) { case ReportTypeAndName: // Umstellung des Typs _CurrentPage = ReportWizardPage.None; this.finish(); break; case ReportSelect: if (getSupportFragmentManager().findFragmentById(R.id.frag_report_type_spinner) != null) { getSupportFragmentManager().beginTransaction() .remove(getSupportFragmentManager().findFragmentById(R.id.frag_report_type_spinner)).commit(); } getSupportFragmentManager().popBackStack(); // Umstellung des Typs _CurrentPage = ReportWizardPage.ReportTypeAndName; break; case ReportPreview: _CurrentPage = ReportWizardPage.ReportSelect; break; default: break; } setButtonState(); } </code></pre> <p>I hope, this help othesr, who tries to implement wizards.</p>

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