//Example MainActivity
Intent intent = new Intent(MainActivity.this, NewActivity.class);intent.putStringArrayListExtra("data", (ArrayList<String>) List);
intent.setClass(getApplicationContext(), NewActivity.class);
startActivity(intent);
//Example NewActivity
if (getIntent().getExtras() != null) {
for(String a : getIntent().getExtras().getStringArrayList("data")) {
List.add(a);
}
}
//This will export your String List on old to new activity