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Sending a list of array objects between actions using Parcelable

I want to send a list of array objects from one action to another. I am expanding my class of objects with Parcelable and a passed list using the onActivityResult intent.

But the list displays null in the second step.

first activity:

public class PlanEventActivity extends AppCompatActivity implements TimePickerDialog.OnTimeSetListener, DatePickerDialog.OnDateSetListener{ private boolean mHoursMode; RelativeLayout chooseEvent,time,date; EditText eventName; TextView timeTextView,dateTextView,chooseEventText; static final int CUSTOM_DIALOG_ID = 0; ListView dialog_ListView; private ImageView addOrganizer; static final int PICK_CONTACT_REQUEST = 1; private ArrayList<contact> mSelectedContacts; private ListViewAdapter mAdapter; private ListView mContactsList; private ArrayList<Integer> selectedItemsPositions; private boolean mContactListActivity; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_plan_event); Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); toolbar.setTitle(""); TextView toolbarTitle = (TextView) toolbar.findViewById(R.id.toolbar_title); toolbarTitle.setText("MeaVita"); setSupportActionBar(toolbar); setUpUI(); mAdapter = new ListViewAdapter(this,mSelectedContacts); mContactsList.setAdapter(mAdapter); mAdapter.setMode(Attributes.Mode.Single); mContactsList.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { ((SwipeLayout)(mContactsList.getChildAt(position - mContactsList.getFirstVisiblePosition()))).open(true); } }); } public void setUpUI() { chooseEvent = (RelativeLayout)findViewById(R.id.chooseEventLayout); time = (RelativeLayout)findViewById(R.id.timeLayout); date = (RelativeLayout)findViewById(R.id.dateLayout); eventName = (EditText)findViewById(R.id.editTextEventName); timeTextView = (TextView)findViewById(R.id.timeTextView); dateTextView = (TextView)findViewById(R.id.dateTextView); chooseEventText = (TextView)findViewById(R.id.chooseEventTextView); addOrganizer = (ImageView)findViewById(R.id.addOrganizer); mContactsList = (ListView)findViewById(R.id.selectedContactsList); mSelectedContacts = new ArrayList<>(); contact contact = new contact(); contact.setContactid("1"); contact.setContactName("sid"); mSelectedContacts.add(contact); contact.setContactid("2"); contact.setContactName("ssss"); mSelectedContacts.add(contact); addOrganizer.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Intent pickContactIntent = new Intent(PlanEventActivity.this,ContactList.class); startActivityForResult(pickContactIntent, PICK_CONTACT_REQUEST); } }); @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { // Check which request we're responding to if (requestCode == PICK_CONTACT_REQUEST) { // Make sure the request was successful if (resultCode == RESULT_OK) { Bundle bundle = data.getExtras(); mContactListActivity = bundle.getBoolean("contactListActivity",true); mSelectedContacts = bundle.getParcelableArrayList("selectedContacts"); } if(mContactListActivity) { addOrganizer.setVisibility(View.INVISIBLE); mContactsList.setVisibility(View.VISIBLE); } else { mContactsList.setVisibility(View.GONE); } } }

Second activity:

 public class ContactList extends AppCompatActivity { private ArrayList<contact> contact_list = null; private contactAdapter mContactAdapter = null; private ArrayList<contact> items; private ArrayList<contact> selectedContacts; boolean[] isChecked; Cursor mCursor; ListView lv; public int RQS_PICK_CONTACT = 1; private static final int PERMISSIONS_REQUEST_READ_CONTACTS = 100; ArrayList<Integer> selectedItemsPositions; private ImageView done; private boolean mContactListActivity; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_contacts_list); Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); toolbar.setTitle(""); TextView toolbarTitle = (TextView) toolbar.findViewById(R.id.toolbar_title); toolbarTitle.setText("Select Contacts"); setSupportActionBar(toolbar); done = (ImageView)findViewById(R.id.done); contact_list = new ArrayList<contact>(); selectedContacts = new ArrayList<contact>(); lv = (ListView)findViewById(R.id.list); showContacts(); done.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View v) { Log.d("selectd",String.valueOf(selectedItemsPositions)); mContactListActivity = true; selectedContacts = new ArrayList<>();//to store selected items for (Integer pos : selectedItemsPositions) { selectedContacts.add(items.get(pos)); } Intent i = new Intent(ContactList.this,PlanEventActivity.class); Bundle b = new Bundle(); b.putSerializable("selectedContacts",(Serializable) selectedContacts); i.putExtras(b); setResult(RESULT_OK, i); finish(); } }); } @SuppressWarnings("unused") private void getContacts() { String[] projection = new String[] { ContactsContract.Contacts.DISPLAY_NAME, ContactsContract.Contacts.HAS_PHONE_NUMBER, ContactsContract.Contacts._ID }; mCursor = managedQuery(ContactsContract.Contacts.CONTENT_URI, null, null, null,null); while (mCursor.moveToNext()) { contact contact = new contact(); String contactId = mCursor.getString(mCursor.getColumnIndex(ContactsContract.Contacts._ID)); contact.setContactid(mCursor.getString(mCursor.getColumnIndex(ContactsContract.Contacts._ID))); contact.setContactName(mCursor.getString(mCursor.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME))); contact_list.add(contact); } isChecked = new boolean[mCursor.getCount()]; for (int i = 0; i < isChecked.length; i++) { isChecked[i] = false; } this.mContactAdapter = new contactAdapter(this, R.layout.contact_list_item, contact_list); lv.setAdapter(this.mContactAdapter); // mCursor.close(); } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { // TODO Auto-generated method stub super.onActivityResult(requestCode, resultCode, data); if (requestCode == RQS_PICK_CONTACT) { if (resultCode == RESULT_OK) { getContacts(); } } } public class contactAdapter extends ArrayAdapter<contact> { public contactAdapter(Context context, int textViewResourceId, ArrayList<contact> items1) { super(context, textViewResourceId, items1); items = items1; selectedItemsPositions = new ArrayList<>(); } //to store all selected items position @Override public View getView(final int position, View convertView, ViewGroup parent) { final ViewHolder mViewHolder; if (convertView == null) { mViewHolder = new ViewHolder(); LayoutInflater vi = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE); convertView = vi.inflate(R.layout.contact_list_item, parent, false); mViewHolder.cb = (CheckBox) convertView.findViewById(R.id.checkBox); mViewHolder.name = (TextView) convertView.findViewById(R.id.name); mViewHolder.cb.setOnCheckedChangeListener(new OnCheckedChangeListener() { @Override public void onCheckedChanged(CompoundButton buttonView, boolean ischecked) { int position = (int) mViewHolder.cb.getTag(); if (ischecked) { //check whether its already selected or not if (!selectedItemsPositions.contains(position)) selectedItemsPositions.add(position); } else { //remove position if unchecked checked item selectedItemsPositions.remove((Object) position); } } }); convertView.setTag(mViewHolder); } else { mViewHolder = (ViewHolder) convertView.getTag(); } contact contacts = items.get(position); mViewHolder.cb.setTag(position); if (selectedItemsPositions.contains(position)) mViewHolder.cb.setChecked(true); else mViewHolder.cb.setChecked(false); mViewHolder.name.setText(contacts.getContactName()); return convertView; } public class ViewHolder { CheckBox cb; TextView name; } } @Override public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) { if (requestCode == PERMISSIONS_REQUEST_READ_CONTACTS) { if (grantResults[0] == PackageManager.PERMISSION_GRANTED) { // Permission is granted getContacts(); } else { Toast.makeText(this, "Until you grant the permission, we canot display the names", Toast.LENGTH_SHORT).show(); } } } private void showContacts() { if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M && checkSelfPermission(Manifest.permission.READ_CONTACTS) != PackageManager.PERMISSION_GRANTED) { requestPermissions(new String[]{Manifest.permission.READ_CONTACTS}, PERMISSIONS_REQUEST_READ_CONTACTS); //After this point you wait for callback in onRequestPermissionsResult(int, String[], int[]) overriden method } else { getContacts(); } } }

Object Class:

 public class contact implements Parcelable { private String contactName; private String contactId; contact(){} contact(String contactId,String contactName) { this.contactId = contactId; this.contactName = contactName; } public contact(Parcel in) { this(); contactId = in.readString(); contactName = in.readString(); } public void writeToParcel(Parcel dest, int flags) { dest.writeString(contactId); dest.writeString(contactName); } public static final Parcelable.Creator<contact> CREATOR = new Parcelable.Creator<contact>() { public contact createFromParcel(Parcel in) { return new contact(in); } public contact[] newArray(int size) { return new contact[size]; } }; public int describeContents() { // TODO Auto-generated method stub return 0; } public String getContactName() { return contactName; } public void setContactName(String contactName) { this.contactName = contactName; } public String getContactid() { return contactId; } public void setContactid(String contactId) { this.contactId = contactId; } }

It doesn’t work out what goes wrong. Can someone help please. Thanks..

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4 answers

When you get the results of calling startActivityForResult() , the Intent result is passed to the onActivityResult() method as the last parameter. You are using the Intent returned from getIntent() , which is the Intent used to start the current Activity , so it will not have the additional functions that you are looking for.

In onActivityResult() , pass the Bundle from the data Intent passed to the method.

 Bundle bundle = data.getExtras();

You will also need to remove this line in onActivityResult() :

 mSelectedContacts = bundle.getParcelableArrayList("selectedContacts");

And replace it with:

 ArrayList<contact> newContacts = bundle.getParcelableArrayList("selectedContacts"); mSelectedContacts.addAll(newContacts); mAdapter.notifyDataSetChanged();

And make sure you change the b.putSerializable() call in ContactList to b.putParcelableArrayList("selectedContacts", selectedContacts) .

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USE IT

  Bundle b = this.getIntent().getExtras(); mSelectedContacts = b.getParcelableArrayList("selectedContacts");

INSTEAD

  Intent i = getIntent(); Bundle bundle = i.getExtras(); mSelectedContacts = i.getParcelableArrayListExtra("selectedContacts");
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I checked your code and got some minor issues,

So maybe correcting it, you can get the results.

Follow the instructions below.

(1) In the PlanEventActivity file, change onActivityResult below,

 @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { // Check which request we're responding to if (requestCode == PICK_CONTACT_REQUEST) { // Make sure the request was successful if (resultCode == RESULT_OK) { Bundle bundle = data.getExtras(); mContactListActivity = bundle.getBoolean("contactListActivity",true); mSelectedContacts = (ArrayList<contact>) bundle.getSerializable("selectedContacts"); mAdapter.notifyDataSetChanged(); } if(mContactListActivity) { addOrganizer.setVisibility(View.INVISIBLE); mContactsList.setVisibility(View.VISIBLE); } else { mContactsList.setVisibility(View.GONE); } }

As you get the result correctly, but not converting it to the correct type, you will get zero, so you need to convert the list of results to the list of results in your contact arraylist, otherwise it will not work. And also after receiving the list displayed as a list, you need to notify the adapter of a change in the data set. You are also paassing a Serializable object, and then get it with the getSerializable method.

(2) Implement Serializable instead of simple for an object, like below

 public class contact implements Serializable.

And now try to run the application, almost finished, you will get the result.

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Do it like this:

  Bundle b = new Bundle(); b.putSerializable("selectedContacts", selectedContacts); i.putExtras(b);

EDIT 2: Get it:

  Bundle bundle = i.getExtras(); mContactListActivity = i.getBooleanExtra("contactListActivity",true); mSelectedContacts = (ArrayList<contact>) i.getSerializableExtra("selectedContacts");

And do not forget:

 public class contact implements Serializable {...}

EDIT:

REMOVE (Serializable) :

Do not write this:

 b.putSerializable("selectedContacts",(Serializable) selectedContacts);

write this:

 b.putSerializable("selectedContacts",selectedContacts);
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