将自定义对象的ArrayList从子活动传回父活动

Intent intent = new Intent(ParentActivity.this, ChildActivity.class);
intent.putParcelableArrayListExtra("customList", customList);
startActivityForResult(intent, REQUEST_CODE);

ArrayList<CustomObject> customList = getIntent().getParcelableArrayListExtra("customList");

Intent intent = new Intent();
intent.putParcelableArrayListExtra("customList", customList);
setResult(RESULT_OK, intent);
finish();

@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
    super.onActivityResult(requestCode, resultCode, data);
    
    if (requestCode == REQUEST_CODE && resultCode == RESULT_OK) {
        ArrayList<CustomObject> customList = data.getParcelableArrayListExtra("customList");
        // 在父活动中使用修改后的ArrayList对象
    }
}