Android - How to Pass Hashmap<String,String> Between Activities

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

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.

Passing Hashmap through android intents

Sending HashMap

HashMap<String, Object> hashmapobject =new HashMap<>();
HashMap<String, Object> newhashMap=new HashMap<>();
hashmapobject.put("key",newhashMap);

Intent intent = new Intent(SenderActivity.this, NextActivity.class);
intent.putExtra("hashMapKey", hashmapobject);
startActivity(intent);

Receiving HashMap

Intent intent = getIntent();    
HashMap<String, Object> hashMapObject = (HashMap<String, Object>)       intent.getSerializableExtra("hashMapKey");
HashMap<String, Object> newhashMap=(HashMap<String, Object>)hashMapObject.get("key");

passing a HashMap from one activity to another, android

Use intent.putExtra(String, Serializable) - see http://developer.android.com/reference/android/content/Intent.html#putExtra%28java.lang.String,%20java.io.Serializable%29.
i.e.

intent.putExtra("placesHashMap", places)

In the receiving activity use

HashMap<String, String> places = (HashMap<String, String>) intent.getSerializableExtra("placesHashMap");

Android:Passing a hash map between Activities

I am assuming you own both Activities (call them A and B). In which case just put the map in a public static variable and access it from B via A.data_map.

[update]

For all of the downvotes take a peek at the Android Application Framework FAQ section "How do I pass data between Activities/Services within a single application?". The solution I recommend is exactly the same as...

A public static field/method

An alternate way to make data
accessible across Activities/Services
is to use public static fields and/or
methods. You can access these static
fields from any other class in your
application. To share an object, the
activity which creates your object
sets a static field to point to this
object and any other activity that
wants to use this object just accesses
this static field.

Yes, there are caveats to this solution but with the limited info presented by the OP we can not assume this method will not work.

pass hashmap data from an activity

Use intent.putExtra(String, Serializable) - see

intent.putExtra("hashMap", fileList);

In the receiving activity use

 HashMap<Integer, boolean[]> fileList = (Integer, boolean[]) intent.getSerializableExtra("hashMap");

And also chnage the below code

Intent intent = new Intent(ExpListViewAdapterWithCheckbox.this, MainActivity.class);

To

Intent intent = new Intent(context, MainActivity.class);

How to pass HashMap String,List String from intent

You are doing it wrong, all Collections are serializable, in order to pass hashmap into intent you use

putExtra(String key, Serializable obj)

and to get the array back from intent, you do

getIntent().getSerializableExtra(String key)

Your Answer

btnsave = (Button) findViewById(R.id.btn_save);
btnsave.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View v) {

        try {
            Intent intent = new Intent( getApplicationContext(), S.class );
            intent.putExtra( "details", getData() );

            startActivity(intent);
        } catch (Exception ex) {
            ex.printStackTrace();
            Toast.makeText(MainActivity.this, "You have an ERROR", Toast.LENGTH_LONG).show();
        }

    }
});

public HashMap< String, List< String > > getData() {
    HashMap< String, List< String > > expandableListDetail = new HashMap<>();

    for ( int i = 2 ; i < container.getChildCount() ; i++ ) {
        if ( container.getChildAt( i ) instanceof RelativeLayout ) {
            List< String > childs = new ArrayList<>();
            childs.add( ( ( TextView ) container.getChildAt( i ).findViewById( R.id.textout ) ).getText().toString() );
            expandableListDetail.put( txtHeading.getText().toString(), childs );
        }
    }
    return expandableListDetail;
}

Android - How to pass HashMap String,List String between activities?

Try below code:

Intent intent=new Intent(CURRENT CLASS.this, CLASS TO CALL.class);
                    intent.putExtra("test", YOUR HASHMAP);
                    startActivity(intent);

In another Activity get data like below:

HashMap<String, List<String>> data=(HashMap<String, List<String>>) this.getIntent().getSerializableExtra("test");

How to send hashmap value to another activity using an intent

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"));
}

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