How to send HashMap
value from one Intent to second Intent?
Also, how to retrieve that HashMap
value in the second Activity?
Java's HashMap class extends the Serializable
interface, which makes it easy to add it to an intent, using the Intent.putExtra(String, Serializable)
method.
In the activity/service/broadcast receiver that receives the intent, you then call
Intent.getSerializableExtra(String)
with the name that you used with putExtra.
For example, when sending the intent:
HashMap<String, String> hashMap = new HashMap<String, String>();
hashMap.put("key", "value");
Intent intent = new Intent(this, MyOtherActivity.class);
intent.putExtra("map", hashMap);
startActivity(intent);
And then in the receiving Activity:
protected void onCreate(Bundle bundle) {
super.onCreate(savedInstanceState);
Intent intent = getIntent();
HashMap<String, String> hashMap = (HashMap<String, String>)intent.getSerializableExtra("map");
Log.v("HashMapTest", hashMap.get("key"));
}