如何使用意图将散列表值发送到另一个活动

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"));
}

I hope this must work too.

in the sending activity

Intent intent = new Intent(Banks.this, Cards.class);
intent.putExtra("selectedBanksAndAllCards", (Serializable) selectedBanksAndAllCards);
startActivityForResult(intent, 50000);

in the receiving activity

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

when I am sending a HashMap like following,

Map<String, ArrayList<String>> selectedBanksAndAllCards = new HashMap<>();

Hope it would help for someone.