I'm making a chat app. I have a recycler view. I use Picasso to download the images of the user and the friend he is chatting with. To not download the image for every message, when I download the first image I just put it into a bitmap and use it every time.
PROBLEM: I can't call NotifyDataSetChanged. I have tried every possible thing I've found on the net.
ERROR :
Cannot call this method while RecyclerView is computing a layout or scrolling android.support.v7.widget.RecyclerView
I have to "manually" refresh the view so that the images are loaded. No problem for the text. It runs with the Handler but it doesn't even go in the function (so the view isn't refreshed). Here is my code (everything works except this notifydatasetchanged)
public class ChatActivity extends AppCompatActivity {
private RecyclerView recyclerChat;
private ListMessageAdapter adapter;
private EditText editWriteMessage;
private LinearLayoutManager linearLayoutManager;
private FirebaseAuth mAuth;
private DatabaseReference UserRef, MessageIDREF, UserMessageRef, SendMessageUser;
private List<ChatClass> ListOfChats = new ArrayList<>();
private ImageButton btnSend;
private String currentUserID, currentDateMessage, currentTimeMessage;
private CommunActivit obj = new CommunActivit();
private String FRIENDID;
private Toolbar mToolbar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_chat);
mAuth=FirebaseAuth.getInstance();
currentUserID = mAuth.getCurrentUser().getUid();
MessageIDREF = FirebaseDatabase.getInstance().getReference().child("Friends");
UserMessageRef = FirebaseDatabase.getInstance().getReference().child("Message").child(obj.getsIDMESSAGE());
btnSend = (ImageButton) findViewById(R.id.btnSend);
editWriteMessage = (EditText) findViewById(R.id.editWriteMessage) ;
FRIENDID = obj.getsIDFRIEND();
mToolbar = (Toolbar) findViewById(R.id.main_app_bar2);
setSupportActionBar(mToolbar);
ActionBar ab = getSupportActionBar();
final String Title = obj.getsFRIENDName();
ab.setTitle(Title);
btnSend.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
SendMessageToGroupChat();
editWriteMessage.setText("");
}
});
retrievedata();
/*recyclerChat = (RecyclerView)findViewById(R.id.recyclerChat);
adapter = new ListMessageAdapter(this,ListOfChats);
RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(this);
recyclerChat.setLayoutManager(layoutManager);
recyclerChat.setItemAnimator(new DefaultItemAnimator());
recyclerChat.setAdapter(adapter);*/
linearLayoutManager = new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false);
recyclerChat = (RecyclerView) findViewById(R.id.recyclerChat);
recyclerChat.setLayoutManager(linearLayoutManager);
adapter = new ListMessageAdapter(this, ListOfChats);
recyclerChat.setAdapter(adapter);
/* editWriteMessage.setOnTouchListener(new View.OnTouchListener() {
@Override
public boolean onTouch(View v, MotionEvent event) {
recyclerChat.smoothScrollToPosition(adapter.getItemCount());
return false;
}
});*/
}
private void SendMessageToGroupChat() {
String message = editWriteMessage.getText().toString();
String messageKey = UserMessageRef.push().getKey();
if (TextUtils.isEmpty(message)) {
Toast.makeText(this, "Please write a message first", Toast.LENGTH_SHORT).show();
} else {
Calendar calendarDate = Calendar.getInstance();
SimpleDateFormat DateFormat = new SimpleDateFormat("MMM dd, yyyy");
currentDateMessage = DateFormat.format(calendarDate.getTime());
Calendar calendarTime = Calendar.getInstance();
SimpleDateFormat TimeFormat = new SimpleDateFormat("hh:mm a");
currentTimeMessage = TimeFormat.format(calendarTime.getTime());
HashMap<String, Object> groupMessageKey = new HashMap<>();
UserMessageRef.updateChildren(groupMessageKey);
SendMessageUser = UserMessageRef.child(messageKey);
HashMap<String, Object> messageInfoMap = new HashMap<>();
messageInfoMap.put("name", obj.getsUsername());
messageInfoMap.put("message", message);
messageInfoMap.put("date", currentDateMessage);
messageInfoMap.put("time", currentTimeMessage);
messageInfoMap.put("image", obj.getsUserImageLink());
SendMessageUser.updateChildren(messageInfoMap);
}
}
public void retrievedata() {
UserMessageRef.addChildEventListener(new ChildEventListener() {
@Override
public void onChildAdded(@NonNull DataSnapshot dataSnapshot, @Nullable String s) /**** HERE IS THE PROBLEM***/
{
if (dataSnapshot.exists()) {
DisplayMessages(dataSnapshot);
}
}
@Override
public void onChildChanged(@NonNull DataSnapshot dataSnapshot, @Nullable String s) {
if (dataSnapshot.exists()) {
DisplayMessages(dataSnapshot);
}
}
@Override
public void onChildRemoved(@NonNull DataSnapshot dataSnapshot) {
}
@Override
public void onChildMoved(@NonNull DataSnapshot dataSnapshot, @Nullable String s) {
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
}
private void DisplayMessages(DataSnapshot dataSnapshot)
{
Iterator iterator = dataSnapshot.getChildren().iterator();
while (iterator.hasNext()) {
String chatDate = (String) ((DataSnapshot) iterator.next()).getValue();
String chatImage = (String) ((DataSnapshot) iterator.next()).getValue();
String chatMessage = (String) ((DataSnapshot) iterator.next()).getValue();
String chatName = (String) ((DataSnapshot) iterator.next()).getValue();
String chatTime = (String) ((DataSnapshot) iterator.next()).getValue();
ListOfChats.add(new ChatClass(chatName, chatMessage, chatDate + " " + chatTime, chatImage));
adapter.notifyDataSetChanged();
recyclerChat.smoothScrollToPosition(adapter.getItemCount()); /**AUTO SCROLL**/
}
}
class ListMessageAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private Context context;
private ChatClass consersation;
private List<ChatClass> List_of_chats;
private CommunActivit obj = new CommunActivit();
private Bitmap BitmapUser;
private Bitmap BitmapFriend;
public ListMessageAdapter(Context context, List<ChatClass> List_of_chats) {
this.context = context;
this.List_of_chats = List_of_chats;
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
if (viewType == 1) {
View view = LayoutInflater.from(context).inflate(R.layout.rc_item_message_friend, parent, false);
return new ItemMessageFriendHolder(view);
} else if (viewType == 2) {
View view = LayoutInflater.from(context).inflate(R.layout.rc_item_message_user, parent, false);
return new ItemMessageUserHolder(view);
}
return null;
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
final int pos =position;
if (holder instanceof ItemMessageFriendHolder) {
((ItemMessageFriendHolder) holder).txtContent.setText(List_of_chats.get(position).getMessage());
if (BitmapFriend == null) {
Picasso.get().load(List_of_chats.get(position).getImageLink()).into(new Target() {
@Override
public void onBitmapLoaded(Bitmap bitmap, Picasso.LoadedFrom from) {
BitmapFriend = bitmap;
}
@Override
public void onBitmapFailed(Exception e, Drawable errorDrawable) {
}
@Override
public void onPrepareLoad(Drawable placeHolderDrawable) {
}
});
((ItemMessageFriendHolder) holder).avata.setImageBitmap(BitmapFriend);
}
else
{
((ItemMessageFriendHolder) holder).avata.setImageBitmap(BitmapFriend);
new Handler().post(new Runnable() {
@Override
public void run() {
notifyDataSetChanged();
}
});
}
}
else
{
if (holder instanceof ItemMessageUserHolder) {
((ItemMessageUserHolder) holder).txtContent.setText(List_of_chats.get(position).getMessage());
if (BitmapUser == null) {
Picasso.get().load(List_of_chats.get(position).getImageLink()).into(new Target() {
@Override
public void onBitmapLoaded(Bitmap bitmap, Picasso.LoadedFrom from) {
BitmapUser = bitmap;
}
@Override
public void onBitmapFailed(Exception e, Drawable errorDrawable) {
}
@Override
public void onPrepareLoad(Drawable placeHolderDrawable) {
}
});
((ItemMessageUserHolder) holder).avata.setImageBitmap(BitmapUser);
} else {
((ItemMessageUserHolder) holder).avata.setImageBitmap(BitmapUser);
new Handler().post(new Runnable() {
@Override
public void run() {
notifyDataSetChanged();
}
});
}
}
}
}
@Override
public int getItemViewType(int position) {
int viewtype = -1;
if (List_of_chats.get(position).getUsername().equals(obj.getsUsername())) {
return 2;
}
else
{
return 1;
}
}
@Override
public int getItemCount() {
return List_of_chats.size();
}
}
class ItemMessageUserHolder extends RecyclerView.ViewHolder {
public TextView txtContent;
public CircleImageView avata;
public ItemMessageUserHolder(View itemView) {
super(itemView);
txtContent = (TextView) itemView.findViewById(R.id.textContentUser);
avata = (CircleImageView) itemView.findViewById(R.id.imageView2);
}
}
class ItemMessageFriendHolder extends RecyclerView.ViewHolder {
public TextView txtContent;
public CircleImageView avata;
public ItemMessageFriendHolder(View itemView) {
super(itemView);
txtContent = (TextView) itemView.findViewById(R.id.textContentFriend);
avata = (CircleImageView) itemView.findViewById(R.id.imageView3);
}
}
