How to print all key and values from HashMap in Android?

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I am very new for Android development, and I am trying to use HashMap in Android sample project. Now, am doing sample project for learn android. I just store keys and values in HashMap, i want to show the keys and their values in EditView. I followed below code in my sample project. But, first key and value only printing in EditView.

   Map<String, String> map = new HashMap<String,String>();
   map.put("iOS", "100");
   map.put("Android", "101");
   map.put("Java", "102");
   map.put(".Net", "103");

   Set keys = map.keySet();

   for (Iterator i = keys.iterator(); i.hasNext(); ) {
       String key = (String) i.next();
       String value = (String) map.get(key);
       textview.setText(key + " = " + value);
   }

In EditView iOS = 100 is only printing. I want to print all keys and their value in EditText. Can anyone please tell me where i am doing wrong? Thanks in advance.

First, there are errors in your code, ie. you are missing a semicolon and a closing parenthesis in the for loop.

Then, if you are trying to append values to the view, you should use textview.appendText(), instead of .setText().

There's a similar question here: how to change text in Android TextView

Print out all keys and values from a Map in Java, So we can use keySet() to print all keys present in the Map and values() to print all 45. import java.util.HashMap;. import java.util.Iterator;. import java.util.Map;. You need to get the keySet from your hashMap and iterate it using e.g. a foreach loop. This way you're getting the keys which can then be used to get the values out of the map.

for (Map.Entry<String,String> entry : map.entrySet()) {
  String key = entry.getKey();
  String value = entry.getValue();
  // do stuff
}

How to get all keys from HashMap?, Description: Below example shows how to get all keys from the given HashMap. By calling keySet() method, you can get set object with all key values. How to print HashMap in Java? The AbstractMap class, the parent class of the HashMap class, has overridden the toString method which returns a string representation of the map. All key-value pairs are enclosed in { and } and separated by a comma (,). The iterator of the entry set returns the order of the key-value pairs.

It's because your TextView recieve new text on every iteration and previuos value thrown away. Concatenate strings by StringBuilder and set TextView value after loop. Also you can use this type of loop:

for (Map.Entry<String, String> e : map.entrySet()) {
    //to get key
    e.getKey();
    //and to get value
    e.getValue();
}

Java – How to get keys and values from Map – Mkyong.com, Map<String, String> map = new HashMap<>(); // Get keys and values for (Map. + k + ", Value: " + v); } // Get all keys Set<String> keys = map. Output Key: password, Value: pass1 Key: db, Value: oracle Key: username,  for (Map.Entry<Object, Object> e : hashmap.entrySet()) { Object key = e.getKey(); Object value = e.getValue(); } However, that's O(n) and kind of defeats the purpose of using a HashMap unless you only need to do it rarely.

HashMap <Integer,Integer> hm = new HashMap<Integer,Integer>();

Set<Integer> keys = hm.keySet();  //get all keys
for(Integer i: keys)
{
    System.out.println(hm.get(i));
}

Hashmap methods in Java with Examples, HashMap.keySet() It returns a Set view of the keys contained in this map. Output: Testing .containsKey : HashMap Initial keys : [Language, Platform, Learn, Code] Initial entrySet() returns all the keys with their values present in Hashmap Break statement in Java · Android: How to Upload an image on Firebase storage? The java.util.HashMap.values () method of HashMap class in Java is used to create a collection out of the values of the map. It basically returns a Collection view of the values in the HashMap. Hash_Map.values () Parameters: The method does not accept any parameters. Return Value: The method is used to return a collection view containing all

You can do it easier with Gson:

Log.i(TAG, "SomeText: " + new Gson().toJson(yourMap));

The result will look like:

I/YOURTAG: SomeText: {"key1":"value1","key2":"value2"}

How to print the elements of a HashMap in Java?, Each key is mapped to a single value in the map and the keys are unique. It means we can insert a key only once in a map and duplicate keys are  This tutorial explains how to get values from Hashmap in java. For more examples and java interview questions log on to www.java-interview-questions.com.

Different Ways to Iterate Through a Map in Java, Iterating over keys or values using For-Each loop. Map<Integer, Integer> map = new HashMap<Integer, Integer>(); //iterating over keys only for  We know that keySet() method returns a Set view of the keys contained in the map and values() method returns a Set view of the values contained in the map. So we can use keySet() to print all keys present in the Map and values() to print all values.

HashMap in Java with Example, HashMap is a Map based collection class that is used for storing Key & value pairs, it is In this example we have demonstrated almost all the important methods of HashMap class. Entry)iterator.next(); System.out.print("key is: "+ mentry. keySet() only returns a set of keys from your hashmap, you should iterate this key set and the get the value from the hashmap using these keys. In your example, the type of the hashmap's key is TypeKey, but you specified TypeValue in your generic for-loop, so it cannot be compiled.

How to get all Entries or Key-Value pairs of HashMap , TreeMap –> retrieves entries or Key-Value pairs, as per some sorting-order. 1. To get all entries of HashMap : use entrySet() method of Map  HashMap is a part of Java’s collection since Java 1.2. It provides the basic implementation of the Map interface of Java. It stores the data in (Key, Value) pairs. To access a value one must know its key. HashMap is known as HashMap because it uses a technique called Hashing. Hashing is a technique of converting a large String to small String

Comments
  • See this question and many others: stackoverflow.com/questions/1066589/…
  • hello Gopinath !! Your code to fetch and set the Hash map key value is correct but you are setting these value to only one textView .
  • Thanks to all. I got the answer. Once again i thank you all.
  • This is the best answer, but see also @Shadow for how to use Java 5 for and Map.Entry properly.
  • Could you please edit in an explanation of why this code answers the question? Code-only answers are discouraged, because they don't teach the solution.
  • OP wants to print all keys and value pairs. I dont think any explanation is needed here. It is an very old thread, already answered, and also no brain thing. I have already written if someone is looking for a solution in Java8, he/she can do something like that.
  • Thank you, added this to my utils
  • Please look at How to Answer