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POHorizontalScrollView scrolls to 0 on fragment replace (Jelly Bean)
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copied!<p>I have a <code>HorizontalScrollView</code> that contains two fragments, fragment A that has list and fragment B that shows the details of the selected item in fragment A. Both fragments have a specific width , so the total width is bigger than the screen and the horizontal scrolling is enabled. One of the possible detail-views contains a form with an <code>EditText</code>. </p> <p>Before JellyBean, replacing the details fragment would never affect the position of the horizontal scrolling. But in 4.1.1, if the user selects the item with the form-type details ,clicks on the EditText and then selects another item (press back to hide keyboard and scroll a bit to the right so that both fragments are visible ), the <code>HorizontalScrollView</code> scrolls back to 0. </p> <p>Here is some code that demonstrates the problem based on the <code>FragmentLayout</code> of the ApiDemos:</p> <pre><code>package com.example.testproject; import android.os.Bundle; import android.support.v4.app.Fragment; import android.support.v4.app.FragmentActivity; import android.support.v4.app.FragmentTransaction; import android.support.v4.app.ListFragment; import android.util.TypedValue; import android.view.Display; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.ArrayAdapter; import android.widget.EditText; import android.widget.LinearLayout; import android.widget.ListView; import android.widget.TextView; public class FragmentLayout extends FragmentActivity { public static final String[] TITLES = { "Row 1", "Row 2", "Row 3", "Row 4", "Row with EditText as detail" }; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.fragment_layout); Fragment sideList = getSupportFragmentManager().findFragmentById( R.id.titles); if (sideList == null) { sideList = new TitlesFragment(); FragmentTransaction ft = getSupportFragmentManager() .beginTransaction(); ft.replace(R.id.titles, sideList, "side_list").commit(); } } public static class TitlesFragment extends ListFragment { int mCurCheckPosition = 0; @Override public void onActivityCreated(Bundle savedInstanceState) { super.onActivityCreated(savedInstanceState); setListAdapter(new ArrayAdapter<String>(getActivity(), android.R.layout.simple_list_item_activated_1, TITLES)); if (savedInstanceState != null) { mCurCheckPosition = savedInstanceState.getInt("curChoice", 0); } getListView().setChoiceMode(ListView.CHOICE_MODE_SINGLE); showDetails(mCurCheckPosition); } @Override public void onSaveInstanceState(Bundle outState) { super.onSaveInstanceState(outState); outState.putInt("curChoice", mCurCheckPosition); } @Override public void onListItemClick(ListView l, View v, int position, long id) { showDetails(position); } void showDetails(int index) { mCurCheckPosition = index; getListView().setItemChecked(index, true); Fragment details = getFragmentManager().findFragmentById( R.id.details); if (index < 4) { details = DetailsFragment.newInstance(index); } else { details = FormFragment.newInstance(index); } FragmentTransaction ft = getFragmentManager().beginTransaction(); ft.replace(R.id.details, details); ft.setTransition(FragmentTransaction.TRANSIT_FRAGMENT_FADE); ft.commit(); } } public static class DetailsFragment extends Fragment { public static DetailsFragment newInstance(int index) { DetailsFragment f = new DetailsFragment(); Bundle args = new Bundle(); args.putInt("index", index); f.setArguments(args); return f; } public int getShownIndex() { return getArguments().getInt("index", 0); } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { if (container == null) { return null; } Display display = getActivity().getWindowManager() .getDefaultDisplay(); LinearLayout l = new LinearLayout(getActivity()); TextView text = new TextView(getActivity()); l.addView(text); text.getLayoutParams().width = display.getWidth(); int padding = (int) TypedValue.applyDimension( TypedValue.COMPLEX_UNIT_DIP, 4, getActivity() .getResources().getDisplayMetrics()); text.setPadding(padding, padding, padding, padding); // use the ApiDemos Shakespeare.java file for the DIALOGUe text.setText(Shakespeare.DIALOGUE[getShownIndex()]); return l; } } public static class FormFragment extends Fragment { public static FormFragment newInstance(int index) { FormFragment f = new FormFragment(); return f; } @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { if (container == null) { return null; } Display display = getActivity().getWindowManager() .getDefaultDisplay(); LinearLayout l = new LinearLayout(getActivity()); EditText text = new EditText(getActivity()); l.addView(text); text.getLayoutParams().width = display.getWidth(); return l; } } } </code></pre> <p>and the only interesting xml fragment_layout.xml:</p> <pre><code><?xml version="1.0" encoding="utf-8"?> <HorizontalScrollView xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:layout_height="fill_parent" > <LinearLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:baselineAligned="false" android:orientation="horizontal" > <FrameLayout android:id="@+id/titles" android:layout_width="300dip" android:layout_height="fill_parent" /> <FrameLayout android:id="@+id/details" android:layout_width="wrap_content" android:layout_height="fill_parent" android:background="?android:attr/detailsElementBackground" /> </LinearLayout> </HorizontalScrollView> </code></pre>

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