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

   1 package net.sf.openrocket.android.util;\r
   2 \r
   3 /*\r
   4  * TODO - this isn't working.\r
   5  */\r
   6 import java.util.ArrayList;\r
   7 import java.util.List;\r
   8 \r
   9 import android.os.Bundle;\r
  10 import android.widget.ExpandableListAdapter;\r
  11 import android.widget.ExpandableListView;\r
  12 \r
  13 public class PersistentExpandableListFragment extends ExpandableListFragment {\r
  14         private long[] expandedIds;\r
  15 \r
  16         @Override\r
  17         public void onCreate(Bundle savedInstanceState) {\r
  18                 AndroidLogWrapper.d(PersistentExpandableListFragment.class, "onCreate");\r
  19                 super.onCreate(savedInstanceState);\r
  20                 if ( savedInstanceState != null ) {\r
  21                         expandedIds = savedInstanceState.getLongArray("ExpandedIds");\r
  22                 }\r
  23         }\r
  24 \r
  25         @Override\r
  26         public void onStop() {\r
  27                 AndroidLogWrapper.d(PersistentExpandableListFragment.class, "onStop");\r
  28                 super.onStop();\r
  29                 expandedIds = getExpandedIds();\r
  30         }\r
  31 \r
  32         @Override\r
  33     public void onStart() {\r
  34                 AndroidLogWrapper.d(PersistentExpandableListFragment.class, "onStart");\r
  35         super.onStart();\r
  36         if (this.expandedIds != null) {\r
  37             restoreExpandedState(expandedIds);\r
  38         }\r
  39     }\r
  40 \r
  41         @Override\r
  42         public void onPause() {\r
  43                 AndroidLogWrapper.d(PersistentExpandableListFragment.class, "onPause");\r
  44                 super.onPause();\r
  45                 expandedIds = getExpandedIds();\r
  46         }\r
  47 \r
  48         \r
  49         @Override\r
  50         public void onResume() {\r
  51                 AndroidLogWrapper.d(PersistentExpandableListFragment.class, "onResume");\r
  52                 super.onResume();\r
  53                 if (this.expandedIds != null) {\r
  54                         restoreExpandedState(expandedIds);\r
  55                 }\r
  56         }\r
  57 \r
  58         @Override\r
  59         public void onSaveInstanceState(Bundle outState) {\r
  60                 super.onSaveInstanceState(outState);\r
  61                 this.expandedIds = getExpandedIds();\r
  62                 outState.putLongArray("ExpandedIds", this.expandedIds);\r
  63         }\r
  64 \r
  65         private long[] getExpandedIds() {\r
  66                 ExpandableListView list = getExpandableListView();\r
  67                 ExpandableListAdapter adapter = getExpandableListAdapter();\r
  68                 if (adapter != null) {\r
  69                         int length = adapter.getGroupCount();\r
  70                         ArrayList<Long> expandedIds = new ArrayList<Long>();\r
  71                         for(int i=0; i < length; i++) {\r
  72                                 if(list.isGroupExpanded(i)) {\r
  73                                         expandedIds.add(adapter.getGroupId(i));\r
  74                                 }\r
  75                         }\r
  76                         return toLongArray(expandedIds);\r
  77                 } else {\r
  78                         return null;\r
  79                 }\r
  80         }\r
  81 \r
  82         private void restoreExpandedState(long[] expandedIds) {\r
  83                 this.expandedIds = expandedIds;\r
  84                 if (expandedIds != null) {\r
  85                         ExpandableListView list = getExpandableListView();\r
  86                         ExpandableListAdapter adapter = getExpandableListAdapter();\r
  87                         if (adapter != null) {\r
  88                                 for (int i=0; i<adapter.getGroupCount(); i++) {\r
  89                                         long id = adapter.getGroupId(i);\r
  90                                         if (inArray(expandedIds, id)) list.expandGroup(i);\r
  91                                 }\r
  92                         }\r
  93                 }\r
  94         }\r
  95 \r
  96         private static boolean inArray(long[] array, long element) {\r
  97                 for (long l : array) {\r
  98                         if (l == element) {\r
  99                                 return true;\r
 100                         }\r
 101                 }\r
 102                 return false;\r
 103         }\r
 104 \r
 105         private static long[] toLongArray(List<Long> list)  {\r
 106                 long[] ret = new long[list.size()];\r
 107                 int i = 0;\r
 108                 for (Long e : list)  \r
 109                         ret[i++] = e.longValue();\r
 110                 return ret;\r
 111         }\r
 112 }\r