我正在使用Android中的Firebase和RecyclerView构建一个简单的聊天应用程序。我有一个按钮可以从图库发送图像消息，还有一个发送按钮可以发送文本消息。问题是，当我发送图像消息时，该消息被复制，此后，无论我发送什么，该消息都被复制。无论如何，当我返回并再次进入消息活动时，该消息会正确显示。我不明白是什么问题。也许列表每次都在复制项目。此外，如果我最小化应用程序，然后发送消息，则消息将变成三倍，四倍等等。
这是我的代码：
@Override
protected void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_message);
currentUserId = FirebaseAuth.getInstance().getCurrentUser().getUid();
reference = FirebaseDatabase.getInstance().getReference().child(getString(R.string.node_profile_settings));
mRootref = FirebaseDatabase.getInstance().getReference();
chatReference = FirebaseDatabase.getInstance().getReference().child(getString(R.string.node_chat));
userReference = FirebaseDatabase.getInstance().getReference().child(getString(R.string.node_users));
messageUserId = getIntent().getStringExtra("message_user_id");
mMessageUsernameTB = findViewById(R.id.messageUsername);
mBackArrow = findViewById(R.id.backArrow);
mPlus = findViewById(R.id.ivPlus);
mSendMessageBtn = findViewById(R.id.ivSendMessageBtn);
mTextMessageInput = findViewById(R.id.etSendMessage);
mOnlineStatus = findViewById(R.id.onlineStatus);
mProgressBar = findViewById(R.id.progressBar);
mRefreshLayout = findViewById(R.id.message_swipe_layout);
mMessageUserLastSeen = findViewById(R.id.messageUserLastseen);
mMessageUserProfileImage = findViewById(R.id.messageUserProfilePhoto);
mRecyclerMessageView = findViewById(R.id.messages_list);
messageListAdapter = new MessageListAdapter(messagesList);
linearLayoutManager = new LinearLayoutManager(this);
mRecyclerMessageView.setHasFixedSize(true);
mRecyclerMessageView.setLayoutManager(linearLayoutManager);
mRecyclerMessageView.setAdapter(messageListAdapter);
mImageStorage = FirebaseStorage.getInstance().getReference();
reference.child(messageUserId).addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
String messageUsername = dataSnapshot.child(getString(R.string.field_name)).getValue().toString();
String messageUserProfilePhoto = dataSnapshot.child(getString(R.string.field_profile_image)).getValue().toString();
mMessageUsernameTB.setText(messageUsername);
Glide.with(getApplicationContext()).applyDefaultRequestOptions(new RequestOptions()
.placeholder(R.drawable.profilephoto)).load(messageUserProfilePhoto).into(mMessageUserProfileImage);
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
userReference.child(messageUserId).addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
Log.d(TAG, "onDataChange: retrieving online status");
String online = dataSnapshot.child("online").getValue().toString();
if(online.equals("true")){
mMessageUserLastSeen.setText("Online");
mOnlineStatus.setVisibility(View.VISIBLE);
}else{
GetTimeAgo getTimeAgo = new GetTimeAgo();
long lastTime = Long.parseLong(online);
String lastSeen = getTimeAgo.getTimeAgo(lastTime, getApplicationContext());
mOnlineStatus.setVisibility(View.INVISIBLE);
mMessageUserLastSeen.setText(lastSeen);
}
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
chatReference.child(currentUserId).addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
if(!dataSnapshot.hasChild(messageUserId)){
Map chatAddMap = new HashMap();
chatAddMap.put("seen", false);
chatAddMap.put("timestamp", ServerValue.TIMESTAMP);
Map chatUserMap = new HashMap();
chatUserMap.put("chats/" + currentUserId + "/" + messageUserId, chatAddMap);
chatUserMap.put("chats/" + messageUserId + "/" + currentUserId, chatAddMap);
mRootref.updateChildren(chatUserMap, new DatabaseReference.CompletionListener() {
@Override
public void onComplete(@Nullable DatabaseError databaseError, @NonNull DatabaseReference databaseReference) {
if(databaseError!=null){
Log.d(TAG, "onComplete: " + databaseError.getMessage().toString());
}
}
});
}
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
mBackArrow.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Log.d(TAG, "onClick: Navigating back");
finish();
}
});
mSendMessageBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Log.d(TAG, "onClick: Sending message");
sendMessage();
}
});
mRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
//CODE TO LOAD MORE MESSAGES
mRefreshLayout.setRefreshing(false);
}
});
mPlus.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent galleryIntent = new Intent();
galleryIntent.setType("image/*");
galleryIntent.setAction(Intent.ACTION_GET_CONTENT);
startActivityForResult(galleryIntent, GALLERY_PICK);
//mCurrent_page = 1;
messagesList.clear();
}
});
}
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if (requestCode == GALLERY_PICK && resultCode == RESULT_OK) {
mProgressBar.setVisibility(View.VISIBLE);
Uri imageUri = data.getData();
final String current_user_ref = "messages/" + currentUserId + "/" + messageUserId;
final String chat_user_ref = "messages/" + messageUserId + "/" + currentUserId;
DatabaseReference user_message_push = mRootref.child("messages")
.child(currentUserId).child(messageUserId).push();
final String push_id = user_message_push.getKey();
final StorageReference filepath = mImageStorage.child("message_images").child(push_id + ".jpg");
filepath.putFile(imageUri).addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
@Override
public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
filepath.getDownloadUrl().addOnSuccessListener(new OnSuccessListener<Uri>() {
@Override
public void onSuccess(Uri uri) {
Uri download_url = uri;
String downloadUrl = download_url.toString();
Map messageMap = new HashMap();
messageMap.put("message", downloadUrl);
messageMap.put("seen", false);
messageMap.put("type", "image");
messageMap.put("time", ServerValue.TIMESTAMP);
messageMap.put("from", currentUserId);
Map messageUserMap = new HashMap();
messageUserMap.put(current_user_ref + "/" + push_id, messageMap);
messageUserMap.put(chat_user_ref + "/" + push_id, messageMap);
mTextMessageInput.setText("");
mProgressBar.setVisibility(View.GONE);
mRootref.updateChildren(messageUserMap, new DatabaseReference.CompletionListener() {
@Override
public void onComplete(DatabaseError databaseError, DatabaseReference databaseReference) {
if (databaseError != null) {
Log.d("CHAT_LOG", databaseError.getMessage().toString());
}
}
});
}
});
}
}).addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception e) {
Log.d(TAG, "onFailure: Photo sending Failed");
}
});
}
}
//SENDING MESSAGE
private void sendMessage() {
Log.d(TAG, "sendMessage: Sending message to the user");
String message = mTextMessageInput.getText().toString();
if (!TextUtils.isEmpty(message)) {
String current_user_ref = "messages/" + currentUserId + "/" + messageUserId;
String chat_user_ref = "messages/" + messageUserId + "/" + currentUserId;
DatabaseReference user_message_push = mRootref.child("messages").child(currentUserId)
.child(messageUserId).push();
String push_id = user_message_push.getKey();
Map messageMap = new HashMap();
messageMap.put("message", message);
messageMap.put("seen", false);
messageMap.put("type", "text");
messageMap.put("time", ServerValue.TIMESTAMP);
messageMap.put("from", currentUserId);
Map messageUserMap = new HashMap();
messageUserMap.put(current_user_ref + "/" + push_id, messageMap);
messageUserMap.put(chat_user_ref + "/" + push_id, messageMap);
mTextMessageInput.setText("");
mRootref.updateChildren(messageUserMap, new DatabaseReference.CompletionListener() {
@Override
public void onComplete(DatabaseError databaseError, DatabaseReference databaseReference) {
if(databaseError != null){
Log.d("CHAT_LOG", databaseError.getMessage().toString());
}
}
});
}else if(TextUtils.isEmpty(message))
{
Toast.makeText(this, "Enter Message first !", Toast.LENGTH_SHORT).show();
}
}
private void loadMessages(){
DatabaseReference messageRef = mRootref.child("messages").child(currentUserId)
.child(messageUserId);
Query messageQuery = messageRef;
messageQuery.addChildEventListener(new ChildEventListener() {
@Override
public void onChildAdded(@NonNull DataSnapshot dataSnapshot, @Nullable String s) {
Messages messages = dataSnapshot.getValue(Messages.class);
messagesList.add(messages);
messageListAdapter.notifyDataSetChanged();
mRecyclerMessageView.scrollToPosition(messagesList.size()-1);
}
@Override
public void onChildChanged(@NonNull DataSnapshot dataSnapshot, @Nullable String s) {
}
@Override
public void onChildRemoved(@NonNull DataSnapshot dataSnapshot) {
}
@Override
public void onChildMoved(@NonNull DataSnapshot dataSnapshot, @Nullable String s) {
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
}
@Override
public void onStart() {
super.onStart();
Handler handler = new Handler();
handler.postDelayed(new Runnable() {
public void run() {
userReference.child(currentUserId).child("online").setValue("true"); // yourMethod();
}
}, 2000);
messagesList.clear();
loadMessages();
}
@Override
public void onStop() {
super.onStop();
userReference.child(currentUserId).child("online").setValue(ServerValue.TIMESTAMP);
}
public class MessageListAdapter extends RecyclerView.Adapter<MessageListAdapter.MessageViewHolder> {
private static final String TAG = "MessageListAdapter";
//Firebase
private FirebaseAuth mAuth;
private DatabaseReference reference;
private List<Messages> userMessagesList;
public MessageListAdapter(List<Messages> userMessagesList) {
this.userMessagesList = userMessagesList;
}
public class MessageViewHolder extends RecyclerView.ViewHolder{
private TextView mSenderMessage, mRecieverMessage;
private CardView mSenderImageCardView, mRecieverImageCardView;
private ImageView mSenderImageMessage, mRecieverImageMessage;
private ProgressBar mProgressBarReciever, mProgressBarSender;
public MessageViewHolder(View itemView) {
super(itemView);
mSenderMessage = itemView.findViewById(R.id.tvSenderMessage);
mRecieverMessage = itemView.findViewById(R.id.tvRecieverMessage);
mSenderImageCardView = itemView.findViewById(R.id.messageImageSenderCardview);
mRecieverImageCardView = itemView.findViewById(R.id.messageImageRecieverCardview);
mSenderImageMessage = itemView.findViewById(R.id.ivSenderImageMessage);
mRecieverImageMessage = itemView.findViewById(R.id.ivRecieverImageMessage);
mProgressBarReciever = itemView.findViewById(R.id.progressBarReciever);
mProgressBarSender = itemView.findViewById(R.id.progressBarSender);
}
}
@NonNull
@Override
public MessageViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
mAuth = FirebaseAuth.getInstance();
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.layout_messages_list, parent, false);
return new MessageViewHolder(view);
}
@Override
public void onBindViewHolder(@NonNull MessageViewHolder holder, int position) {
String messageSenderId = mAuth.getCurrentUser().getUid();
Messages messages = userMessagesList.get(position);
String fromUserId = messages.getFrom();
String fromMessageType = messages.getType();
reference = FirebaseDatabase.getInstance().getReference().child("users").child(fromUserId);
if(fromMessageType.equals("text")){
holder.mRecieverMessage.setVisibility(View.GONE);
holder.mSenderMessage.setVisibility(View.GONE);
holder.mSenderImageCardView.setVisibility(View.GONE);
holder.mRecieverImageCardView.setVisibility(View.GONE);
if(fromUserId.equals(messageSenderId)){
holder.mSenderMessage.setVisibility(View.VISIBLE);
holder.mSenderMessage.setBackgroundResource(R.drawable.sender_message_layout);
holder.mSenderMessage.setTextColor(Color.WHITE);
holder.mSenderMessage.setText(messages.getMessage());
}else {
holder.mRecieverMessage.setVisibility(View.VISIBLE);
holder.mRecieverMessage.setBackgroundResource(R.drawable.reciever_message_layout);
holder.mRecieverMessage.setTextColor(Color.BLACK);
holder.mRecieverMessage.setText(messages.getMessage());
}
} else if(fromMessageType.equals("image")){
holder.mRecieverMessage.setVisibility(View.GONE);
holder.mSenderMessage.setVisibility(View.GONE);
holder.mSenderImageCardView.setVisibility(View.GONE);
holder.mRecieverImageCardView.setVisibility(View.GONE);
if(fromUserId.equals(messageSenderId)){
holder.mSenderImageCardView.setVisibility(View.VISIBLE);
holder.mProgressBarSender.setVisibility(View.VISIBLE);
Glide.with(holder.mSenderImageCardView.getContext())
.applyDefaultRequestOptions(new RequestOptions()
.placeholder(R.drawable.profilephoto)).load(messages.getMessage()).into(holder.mSenderImageMessage);
holder.mProgressBarSender.setVisibility(View.GONE);
}else {
holder.mRecieverImageCardView.setVisibility(View.VISIBLE);
holder.mProgressBarReciever.setVisibility(View.VISIBLE);
Glide.with(holder.mRecieverImageCardView.getContext())
.applyDefaultRequestOptions(new RequestOptions()
.placeholder(R.drawable.profilephoto)).load(messages.getMessage()).into(holder.mRecieverImageMessage);
holder.mProgressBarReciever.setVisibility(View.GONE);
}
}
}
@Override
public int getItemCount() {
return userMessagesList.size();
}
}