git.gag.com Git - debian/openrocket/blob - android/src/net/sf/openrocket/android/motor/PersistentExpandableListActivity.java

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