Android - How to pass HashMap<String,String> between activities?

Question

How to pass the detail HashMap to another Activity?

HashMap<String,String> detail = new HashMap<String, String>();
detail.add("name","paresh");
detail.add("surname","mayani");
detail.add("phone","99999");
......
......

Answer 1

This is pretty simple, All Collections objects implement Serializable (sp?) interface which means they can be passed as Extras inside Intent

Use putExtra(String key, Serializable obj) to insert the HashMap and on the other Activity use getIntent().getSerializableExtra(String key), You will need to Cast the return value as a HashMap though.

Answer 2

Solution:

Sender Activity:

HashMap<String, String> hashMap= adapter.getItem(position);
Intent intent = new Intent(SourceActivity.this, DestinationActivity.class);
intent.putExtra("hashMap", hashMap);
startActivity(intent);

Receiver Activity:

Intent intent = getIntent();    
HashMap<String, String> hashMap = (HashMap<String, String>) intent.getSerializableExtra("hashMap");

Answer 3

i used this to pass my HashMap

startActivity(new Intent(currentClass.this,toOpenClass.class).putExtra("hashMapKey", HashMapVariable));

and on the receiving activity write

HashMap<String,String> hm = (HashMap<String,String>) getIntent().getExtras().get("hashMapKey");

cuz i know my hashmap contains string as value.

Answer 4

An alternative is if the information is something that might be considered "global" to the application, to then use the Application class. You simply extend it and then define your custom class in your manifest using the <application> tag. Use this sparingly, though. The urge to abuse it is high.