Android - Get value from HashMap

Question

I have tried to search on HashMap in Android  but getting problem   Consider this example   HashMap lt String  String gt  meMap new HashMap lt String  String gt     meMap put  Color1   Red    meMap put  Color2   Blue    meMap put  Color3   Green    meMap put  Color4   White      now I want to iterate it and get the value of each color and want to display in  Toast   how do I display it

User · Answer

Note  If you know Key  use this code  String value meMap get key

User · Answer

HashMap lt String  String gt  meMap   new HashMap lt String  String gt     meMap put  Color1    Red    meMap put  Color2    Blue    meMap put  Color3    Green    meMap put  Color4    White     Iterator myVeryOwnIterator   meMap values   iterator    while myVeryOwnIterator hasNext          Toast makeText getBaseContext    myVeryOwnIterator next    Toast LENGTH SHORT  show

User · Answer

This with no warnings       HashMap lt String  String gt  meMap new HashMap lt String  String gt         meMap put  Color1   Red        meMap put  Color2   Blue        meMap put  Color3   Green        meMap put  Color4   White         for  Object o   meMap keySet              Toast makeText getBaseContext    meMap get o toString                     Toast LENGTH SHORT  show

User · Answer

Iterator myVeryOwnIterator   meMap keySet   iterator    while myVeryOwnIterator hasNext          String key  String myVeryOwnIterator next        String value  String meMap get key       Toast makeText ctx   Key    key   Value    value  Toast LENGTH LONG  show

User · Answer

this work for me   HashMap lt String  String gt  meMap new HashMap lt String  String gt     meMap put  Color1   Red    meMap put  Color2   Blue    meMap put  Color3   Green    meMap put  Color4   White     Iterator iterator   meMap keySet   iterator    while  iterator  hasNext           Toast makeText getBaseContext    meMap get iterator next   toString          Toast LENGTH SHORT  show

User · Answer

Iterator iterator   meMap keySet   iterator                    while iterator hasNext                          get key                     String key  String iterator next                          toast value                                            Toast makeText getBaseContext       String meMap get key  Toast LENGTH SHORT  show

User · Answer

Here s a simple example to demonstrate Map usage   Map lt String  String gt  map   new HashMap lt String  String gt     map put  Color1   Red    map put  Color2   Blue    map put  Color3   Green    map put  Color4   White     System out println map       Color4 White  Color3 Green  Color1 Red  Color2 Blue           System out println map get  Color2        Blue  System out println map keySet         Color4  Color3  Color1  Color2   for  Map Entry lt String String gt  entry   map entrySet          System out printf   s - gt   s n   entry getKey    entry getValue          Color4 - gt  White    Color3 - gt  Green    Color1 - gt  Red    Color2 - gt  Blue   Note that the entries are iterated in arbitrary order  If you need a specific order  then you may consider e g  LinkedHashMap  See also   Effective Java 2nd Edition  Item 52  Refer to objects by their interfaces Java Tutorials Collections - The Map interface Java Language Guide The for-each loop   Related questions  On iterating over entries    Iterate Over Map iterating over and removing from a map   If you want to modify the map while iterating  you d need to use its Iterator     On different Map characteristics    How to Maintain order of insertion using collections     On enum  You may want to consider using an enum and EnumMap instead of Map lt String String gt    See also   Java Language Guide Enums   Related questions   Enumerations  Why  When

User · Answer

for  Object key   meMap keySet              String value  String meMap get key           Toast makeText ctx   Key    key   Value    value  Toast LENGTH LONG  show

User · Answer

HashMap lt String  String gt  meMap new HashMap lt String  String gt     meMap put  Color1   Red    meMap put  Color2   Blue    meMap put  Color3   Green    meMap put  Color4   White    Iterator iterator   meMap keySet   iterator    while  iterator  hasNext          Toast makeText getBaseContext    meMap get iterator next   toString          Toast LENGTH SHORT  show

[java] Android - Get value from HashMap

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