Convert ArrayList to String array in Android

Question

I have a ArrayList that contains values in the form  ann john   I want to convert this ArrayList into a String array in the form   ann   john     How should I do this   My Android code        final Button markabsent    Button  findViewById R id Button02         markabsent setOnClickListener new View OnClickListener               public void onClick View v                    Perform action on click              Toast makeText display this  You have marked the students absent  Toast LENGTH SHORT  show                  SparseBooleanArray checkedabsent   lView getCheckedItemPositions                   for  int i   0  i  lt  arr2 length  i                                   if  checkedabsent get i                                          items2 add arr2 i                        System out println items2                                                 Log d      items                 for  String string   items2                                Log d  string is   string                                               My Logcat        11-10 21 44 00 414  INFO System out 2316    ann  john  ann       11-10 21 44 00 414  DEBUG  2316   items       11-10 21 44 00 414  DEBUG string is 2316   ann      11-10 21 44 00 414  DEBUG string is 2316   john   I tried doing everything mentioned in the answers but my logcat just doesn t seem to imrove  Here is the one giving exceptions             11-10 22 14 20 855  INFO System out 3322    Ljava lang String  44eb6ff0           11-10 22 16 38 186  ERROR AndroidRuntime 3411   FATAL EXCEPTION  main           11-10 22 16 38 186  ERROR AndroidRuntime 3411   java lang ClassCastException   Ljava lang Object            11-10 22 16 38 186  ERROR AndroidRuntime 3411       at com example display 2 onClick display java 124            11-10 22 16 38 186  ERROR AndroidRuntime 3411       at android view View performClick View java 2408            11-10 22 16 38 186  ERROR AndroidRuntime 3411       at android view View PerformClick run View java 8816            11-10 22 16 38 186  ERROR AndroidRuntime 3411       at android os Handler handleCallback Handler java 587    Here is one more             11-10 22 14 20 875  DEBUG string is 3322   ann           11-10 22 14 20 875  INFO System out 3322    Ljava lang String  44eb7720           11-10 22 14 20 875  INFO System out 3322    Ljava lang String  44eb7720           11-10 22 14 20 885  INFO System out 3322    Ljava lang String  44eb7720           11-10 22 14 20 895  DEBUG string is 3322   john           11-10 22 14 20 895  INFO System out 3322    Ljava lang String  44eb7de8           11-10 22 16 38 186  ERROR AndroidRuntime 3411       at com example display 2 onClick display java 124

User · Answer

You can try this code  String   stringA   new String stringArrayList size     stringArrayList toArray stringA  System out println stringA 0

User · Answer

Well in general   List lt String gt  names   new ArrayList lt String gt     names add  john    names add  ann     String   namesArr   new String names size     for  int i   0  i  lt  names size    i          namesArr i    names get i         Or better yet  using built in   List lt String gt  names   new ArrayList lt String gt     String   namesArr   names toArray new String names size

User · Answer

try this  List lt String gt  list   new ArrayList lt String gt     list add  List1    list add  List2     String   listArr   new String list size     listArr   list toArray listArr     for String s   listArr       System out println s

User · Answer

Use the method  toArray     ArrayList lt String gt   mStringList  new ArrayList lt String gt     mStringList add  ann    mStringList add  john    Object   mStringArray   mStringList toArray     for int i   0  i  lt  mStringArray length   i         Log d  string is   String mStringArray i        or you can do it like this   mentioned in other answers   ArrayList lt String gt   mStringList  new ArrayList lt String gt     mStringList add  ann    mStringList add  john    String   mStringArray   new String mStringList size     mStringArray   mStringList toArray mStringArray    for int i   0  i  lt  mStringArray length   i         Log d  string is   String mStringArray i        http   developer android com reference java util ArrayList html toArray

User · Answer

You could make an array the same size as the ArrayList and then make an iterated for loop to index the items and insert them into the array

User · Answer

I know im very late to answer this  But it will help others  I was also stucked on this   Here is what i did to get it work   String   namesArr    String    names toArray new String names size

User · Answer

String   array   new String items2 size     items2 toArray array

[android] Convert ArrayList to String array in Android

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