我有CHAT APP，当我显示消息时出现问题该APP有时“在重新打开聊天活动时”在recycleview中仅显示最后1条消息，我不知道代码中的问题在哪里，但是谁能帮助我对此，首先要感谢<3
Intent intent;
List<ChatModel> data;
private RecyclerView mRecy;
ChatAdapter chatAdapter;
String mId;
Button sendmessage;
private EditText mEditWriteMessage;
FirebaseUser firebaseUser = FirebaseAuth.getInstance().getCurrentUser();
ChatModel chatModel;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_mechanic_profile);
sendmessage = findViewById(R.id.sendmessage);
mEditWriteMessage = findViewById(R.id.editWriteMessage);
intent = getIntent();
mRecy = findViewById(R.id.recy);
DatabaseReference databaseReference = FirebaseDatabase.getInstance().getReference("CHHAATS");
data = new ArrayList<>();
chatAdapter = new ChatAdapter(getApplicationContext(), data);
mRecy.setHasFixedSize(true);
mRecy.setLayoutManager(new LinearLayoutManager(getApplicationContext()));
mRecy.setAdapter(chatAdapter);
databaseReference.addChildEventListener(new ChildEventListener() {
@Override
public void onChildAdded(@NonNull DataSnapshot dataSnapshot, @Nullable String s) {
for (DataSnapshot snapshot : dataSnapshot.getChildren()) {
chatModel = snapshot.getValue(ChatModel.class);
}
if (chatModel.getFrom().equals(firebaseUser.getUid()) && chatModel.getTo().equals(intent.getStringExtra("receiver"))
|| chatModel.getFrom().equals(intent.getStringExtra("receiver")) && chatModel.getTo().equals(firebaseUser.getUid())) {
data.add(chatModel);
mRecy.scrollToPosition(data.size() - 1);
}
}
@Override
public void onChildChanged (@NonNull DataSnapshot dataSnapshot, @Nullable String s){
for (DataSnapshot snapshot : dataSnapshot.getChildren()) {
chatModel = snapshot.getValue(ChatModel.class);
}
if (chatModel.getFrom().equals(firebaseUser.getUid()) && chatModel.getTo().equals(intent.getStringExtra("receiver"))
|| chatModel.getFrom().equals(intent.getStringExtra("receiver")) && chatModel.getTo().equals(firebaseUser.getUid())) {
data.add(chatModel);
chatAdapter.notifyDataSetChanged();
mRecy.scrollToPosition(data.size() - 1);
}
}
@Override
public void onChildRemoved (@NonNull DataSnapshot dataSnapshot){
}
@Override
public void onChildMoved (@NonNull DataSnapshot dataSnapshot, @Nullable String s){
}
@Override
public void onCancelled (@NonNull DatabaseError databaseError){
}
});
sendmessage.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick (View v){
String message = mEditWriteMessage.getText().toString();
String receiver = intent.getStringExtra("receiver");
String sender = firebaseUser.getUid();
meth(message, receiver, sender);
}
});
}
void meth (String message, String receiver, String sender){
DatabaseReference reference = FirebaseDatabase.getInstance().getReference("CHHAATS");
HashMap<String, Object> hashMap = new HashMap<>();
hashMap.put("text", message);
hashMap.put("from", sender);
hashMap.put("to", receiver);
reference.child(receiver).push().setValue(hashMap);
}
}
关于我的问题，这就是我所能写的...........