git.gag.com Git - debian/openrocket/blob - android/src/net/sf/openrocket/android/util/PersistentExpandableListView.java

   1 package net.sf.openrocket.android.util;\r
   2 \r
   3 import java.util.ArrayList;\r
   4 import java.util.List;\r
   5 \r
   6 import android.content.Context;\r
   7 import android.os.Bundle;\r
   8 import android.os.Parcelable;\r
   9 import android.util.AttributeSet;\r
  10 import android.widget.ExpandableListAdapter;\r
  11 import android.widget.ExpandableListView;\r
  12 \r
  13 public class PersistentExpandableListView extends ExpandableListView {\r
  14 \r
  15         public PersistentExpandableListView(Context context, AttributeSet attrs,\r
  16                         int defStyle) {\r
  17                 super(context, attrs, defStyle);\r
  18         }\r
  19 \r
  20         public PersistentExpandableListView(Context context, AttributeSet attrs) {\r
  21                 super(context, attrs);\r
  22         }\r
  23 \r
  24         public PersistentExpandableListView(Context context) {\r
  25                 super(context);\r
  26         }\r
  27 \r
  28         @Override\r
  29         public Parcelable onSaveInstanceState() {\r
  30                 Bundle b = new Bundle();\r
  31                 long[] expandedIds = getExpandedIds();\r
  32                 b.putLongArray("ExpandedIds", expandedIds);\r
  33                 return b;\r
  34         }\r
  35 \r
  36         @Override\r
  37         public void onRestoreInstanceState(Parcelable state) {\r
  38                 Bundle b = (Bundle) state;\r
  39                 long[] expandedIds = b.getLongArray("ExpandedIds");\r
  40                 restoreExpandedState(expandedIds);\r
  41         }\r
  42 \r
  43         private long[] getExpandedIds() {\r
  44                 ExpandableListAdapter adapter = getExpandableListAdapter();\r
  45                 if (adapter != null) {\r
  46                         int length = adapter.getGroupCount();\r
  47                         ArrayList<Long> expandedIds = new ArrayList<Long>();\r
  48                         for(int i=0; i < length; i++) {\r
  49                                 if(this.isGroupExpanded(i)) {\r
  50                                         expandedIds.add(adapter.getGroupId(i));\r
  51                                 }\r
  52                         }\r
  53                         return toLongArray(expandedIds);\r
  54                 } else {\r
  55                         return null;\r
  56                 }\r
  57         }\r
  58 \r
  59         private static long[] toLongArray(List<Long> list)  {\r
  60                 long[] ret = new long[list.size()];\r
  61                 int i = 0;\r
  62                 for (Long e : list)  \r
  63                         ret[i++] = e.longValue();\r
  64                 return ret;\r
  65         }\r
  66 \r
  67         private void restoreExpandedState(long[] expandedIds) {\r
  68                 if (expandedIds != null) {\r
  69                         ExpandableListAdapter adapter = getExpandableListAdapter();\r
  70                         if (adapter != null) {\r
  71                                 for (int i=0; i<adapter.getGroupCount(); i++) {\r
  72                                         long id = adapter.getGroupId(i);\r
  73                                         if (inArray(expandedIds, id)) this.expandGroup(i);\r
  74                                 }\r
  75                         }\r
  76                 }\r
  77         }\r
  78 \r
  79         private static boolean inArray(long[] array, long element) {\r
  80                 for (long l : array) {\r
  81                         if (l == element) {\r
  82                                 return true;\r
  83                         }\r
  84                 }\r
  85                 return false;\r
  86         }\r
  87 \r
  88 \r
  89 }\r