结对冲刺10

实现ChatAticity

复制代码
  1 package com.example.chatapptest.activities;
  2 
  3 import androidx.appcompat.app.AppCompatActivity;
  4 
  5 import android.graphics.Bitmap;
  6 import android.graphics.BitmapFactory;
  7 import android.os.Bundle;
  8 import android.util.Base64;
  9 import android.view.View;
 10 
 11 import com.example.chatapptest.R;
 12 import com.example.chatapptest.adapters.ChatAdapter;
 13 import com.example.chatapptest.databinding.ActivityChatBinding;
 14 import com.example.chatapptest.models.ChatMessage;
 15 import com.example.chatapptest.models.User;
 16 import com.example.chatapptest.utilities.Constants;
 17 import com.example.chatapptest.utilities.PreferenceManager;
 18 import com.google.android.gms.tasks.OnCompleteListener;
 19 import com.google.firebase.firestore.DocumentChange;
 20 import com.google.firebase.firestore.DocumentReference;
 21 import com.google.firebase.firestore.DocumentSnapshot;
 22 import com.google.firebase.firestore.EventListener;
 23 import com.google.firebase.firestore.FirebaseFirestore;
 24 import com.google.firebase.firestore.QuerySnapshot;
 25 
 26 import java.text.SimpleDateFormat;
 27 import java.util.ArrayList;
 28 import java.util.Collections;
 29 import java.util.Date;
 30 import java.util.HashMap;
 31 import java.util.List;
 32 import java.util.Locale;
 33 import java.util.Objects;
 34 
 35 public class ChatActivity extends BaseActivity {
 36 
 37     private ActivityChatBinding binding;
 38     private User receiverUser;
 39     private List<ChatMessage> chatMessages;
 40     private ChatAdapter chatAdapter;
 41     private PreferenceManager preferenceManager;
 42     private FirebaseFirestore database;
 43     private String conversionId = null;
 44 
 45     private Boolean isReceiverAvailable = false;
 46 
 47     @Override
 48     protected void onCreate(Bundle savedInstanceState) {
 49         super.onCreate(savedInstanceState);
 50         binding = ActivityChatBinding.inflate(getLayoutInflater());
 51         setContentView(binding.getRoot());
 52         setListeners();
 53         loadReceiverDetails();
 54         init();
 55         listenMessages();
 56     }
 57 
 58     private void init(){
 59         preferenceManager = new PreferenceManager(getApplicationContext());
 60         chatMessages = new ArrayList<>();
 61         chatAdapter = new ChatAdapter(
 62                 chatMessages,
 63                 getBitmapFromEncodedString(receiverUser.image),
 64                 preferenceManager.getString(Constants.KEY_USER_ID)
 65         );
 66         binding.chatRecyclerView.setAdapter(chatAdapter);
 67         database = FirebaseFirestore.getInstance();
 68     }
 69 
 70     private void sendMessage(){
 71         HashMap<String,Object> message = new HashMap<>();
 72         message.put(Constants.KEY_SENDER_ID,preferenceManager.getString(Constants.KEY_USER_ID));
 73         message.put(Constants.KEY_RECEIVER_ID,receiverUser.id);
 74         message.put(Constants.KEY_MESSAGE,binding.inputMessage.getText().toString());
 75         message.put(Constants.KEY_TIMESTAMP,new Date());
 76         database.collection(Constants.KEY_COLLECTION_CHAT).add(message);
 77         if(conversionId != null){
 78             updateConversion(binding.inputMessage.getText().toString());
 79         }else {
 80             HashMap<String ,Object> conversion = new HashMap<>();
 81             conversion.put(Constants.KEY_SENDER_ID,preferenceManager.getString(Constants.KEY_USER_ID));
 82             conversion.put(Constants.KEY_SENDER_NAME,preferenceManager.getString(Constants.KEY_NAME));
 83             conversion.put(Constants.KEY_SENDER_IMAGE,preferenceManager.getString(Constants.KEY_IMAGE));
 84             conversion.put(Constants.KEY_RECEIVER_ID,receiverUser.id);
 85             conversion.put(Constants.KEY_RECEIVER_NAME,receiverUser.name);
 86             conversion.put(Constants.KEY_RECEIVER_IMAGE,receiverUser.image);
 87             conversion.put(Constants.KEY_LAST_MESSAGE,binding.inputMessage.getText().toString());
 88             conversion.put(Constants.KEY_TIMESTAMP,new Date());
 89             addConversion(conversion);
 90         }
 91         binding.inputMessage.setText(null);
 92     }
 93 
 94     private void listenAvailabilityOfReceiver(){
 95         database.collection(Constants.KEY_COLLECTION_USERS).document(
 96                 receiverUser.id
 97         ).addSnapshotListener(ChatActivity.this,(value, error) -> {
 98             if(error != null){
 99                 return;
100             }
101             if(value != null){
102                 if(value.getLong(Constants.KEY_AVAILABILITY) != null){
103                     int availability = Objects.requireNonNull(
104                             value.getLong(Constants.KEY_AVAILABILITY)
105                     ).intValue();
106                     isReceiverAvailable = availability == 1;
107                 }
108             }
109             if(isReceiverAvailable){
110                 binding.textAvailability.setVisibility(View.VISIBLE);
111             }else {
112                 binding.textAvailability.setVisibility(View.GONE);
113             }
114         });
115     }
116 
117     private void listenMessages(){
118         database.collection(Constants.KEY_COLLECTION_CHAT)
119                 .whereEqualTo(Constants.KEY_SENDER_ID,preferenceManager.getString(Constants.KEY_USER_ID))
120                 .whereEqualTo(Constants.KEY_RECEIVER_ID,receiverUser.id)
121                 .addSnapshotListener(eventListener);
122         database.collection(Constants.KEY_COLLECTION_CHAT)
123                 .whereEqualTo(Constants.KEY_SENDER_ID,receiverUser.id)
124                 .whereEqualTo(Constants.KEY_RECEIVER_ID,preferenceManager.getString(Constants.KEY_USER_ID))
125                 .addSnapshotListener(eventListener);
126     }
127     private final EventListener<QuerySnapshot> eventListener = (value, error) -> {
128         if(error != null){
129             return;
130         }
131         if(value != null){
132             int count = chatMessages.size();
133             for(DocumentChange documentChange : value.getDocumentChanges()){
134                 if(documentChange.getType() == DocumentChange.Type.ADDED){
135                     ChatMessage chatMessage = new ChatMessage();
136                     chatMessage.senderId = documentChange.getDocument().getString(Constants.KEY_SENDER_ID);
137                     chatMessage.receiverId = documentChange.getDocument().getString(Constants.KEY_RECEIVER_ID);
138                     chatMessage.message = documentChange.getDocument().getString(Constants.KEY_MESSAGE);
139                     chatMessage.dataTime = getReadableDateTime(documentChange.getDocument().getDate(Constants.KEY_TIMESTAMP));
140                     chatMessage.dateObject = documentChange.getDocument().getDate(Constants.KEY_TIMESTAMP);
141                     chatMessages.add(chatMessage);
142                 }
143             }
144             Collections.sort(chatMessages,(obj1,obj2) -> obj1.dateObject.compareTo(obj2.dateObject));
145             if(count == 0){
146                 chatAdapter.notifyDataSetChanged();
147             }else {
148                 chatAdapter.notifyItemRangeInserted(chatMessages.size(),chatMessages.size());
149                 binding.chatRecyclerView.smoothScrollToPosition(chatMessages.size()-1);
150             }
151             binding.chatRecyclerView.setVisibility(View.VISIBLE);
152         }
153         binding.progressBar.setVisibility(View.GONE);
154         if(conversionId == null){
155             checkForConversion();
156         }
157     };
158 
159     private Bitmap getBitmapFromEncodedString(String encodedImage){
160         byte[] bytes = Base64.decode(encodedImage,Base64.DEFAULT);
161         return BitmapFactory.decodeByteArray(bytes,0, bytes.length);
162     }
163 
164     private void loadReceiverDetails(){
165         receiverUser = (User) getIntent().getSerializableExtra(Constants.KEY_USER);
166         binding.textName.setText(receiverUser.name);
167     }
168 
169     private void setListeners(){
170         binding.imageBack.setOnClickListener(v -> onBackPressed());
171         binding.layoutSend.setOnClickListener(v -> sendMessage());
172     }
173 
174     private String getReadableDateTime(Date date){
175         return new SimpleDateFormat("MMMM dd, yyyy - hh:mm a", Locale.getDefault()).format(date);
176     }
177 
178     private void updateConversion(String message){
179         DocumentReference documentReference =
180                 database.collection(Constants.KEY_COLLECTION_CONVERSATIONS).document(conversionId);
181         documentReference.update(
182                 Constants.KEY_LAST_MESSAGE,message,
183                 Constants.KEY_TIMESTAMP,new Date()
184         );
185     }
186 
187     private void addConversion(HashMap<String,Object> conversion){
188         database.collection(Constants.KEY_COLLECTION_CONVERSATIONS)
189                 .add(conversion)
190                 .addOnSuccessListener(documentReference -> conversionId = documentReference.getId());
191     }
192 
193     private void checkForConversion(){
194         if(chatMessages.size() != 0 ){
195             checkForConversionRemotely(
196                     preferenceManager.getString(Constants.KEY_USER_ID),
197                     receiverUser.id
198             );
199             checkForConversionRemotely(
200                     receiverUser.id,
201                     preferenceManager.getString(Constants.KEY_USER_ID)
202             );
203         }
204     }
205 
206     private void checkForConversionRemotely(String senderId,String receiverId){
207         database.collection(Constants.KEY_COLLECTION_CONVERSATIONS)
208                 .whereEqualTo(Constants.KEY_SENDER_ID,senderId)
209                 .whereEqualTo(Constants.KEY_RECEIVER_ID,receiverId)
210                 .get()
211                 .addOnCompleteListener(conversionOnCompleteListener);
212     }
213 
214     private final OnCompleteListener<QuerySnapshot> conversionOnCompleteListener = task -> {
215         if(task.isSuccessful() && task.getResult() != null && task.getResult().getDocuments().size() > 0){
216             DocumentSnapshot documentSnapshot = task.getResult().getDocuments().get(0);
217             conversionId = documentSnapshot.getId();
218         }
219     };
220 
221     @Override
222     protected void onResume() {
223         super.onResume();
224         listenAvailabilityOfReceiver();
225     }
226 }
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posted @   新晋软工小白  阅读(4)  评论(0)  编辑  收藏  举报
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