您好我正在开发一个使用parse作为后端和sinch服务的Android聊天应用程序。 一切都很好，就像在两个Android设备之间发送和接收消息一样。我也使用来自parse.com的推送通知。 现在我想修改应用程序，比如新消息到达时它必须显示消息在我的聊天应用程序中是等待的 最新应用内
这是我的代码
ListUserActivity.java
private void setConversationsList() {
currentUserId = ParseUser.getCurrentUser().getObjectId();
names = new ArrayList<String>();
ParseQuery<ParseUser> query = ParseUser.getQuery();
query.whereNotEqualTo("objectId", currentUserId);
query.findInBackground(new FindCallback<ParseUser>() {
public void done(List<ParseUser> userList, com.parse.ParseException e) {
if (e == null) {
for (int i=0; i<userList.size(); i++) {
names.add(userList.get(i).getUsername().toString());
}
usersListView = (ListView)findViewById(R.id.usersListView);
namesArrayAdapter =
new ArrayAdapter<String>(getApplicationContext(),
R.layout.user_list_item, names);
usersListView.setAdapter(namesArrayAdapter);
usersListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> a, View v, int i, long l) {
try {
System.out.println(i);
openConversation(names, i);
}
catch (IndexOutOfBoundsException e1){
System.out.println(e1.getMessage());
}
}
});
} else {
Toast.makeText(getApplicationContext(),
"Error loading user list",
Toast.LENGTH_LONG).show();
}
}
});
}
MessagingActivity.java
public class MessagingActivity extends ActionBarActivity {
private String recipientId;
private String name;
private EditText messageBodyField;
private String messageBody;
private MessageService.MessageServiceInterface messageService;
private MessageAdapter messageAdapter;
private ListView messagesList;
private String currentUserId;
private ServiceConnection serviceConnection = new MyServiceConnection();
private MessageClientListener messageClientListener = new MyMessageClientListener();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.messaging);
bindService(new Intent(this, MessageService.class), serviceConnection, BIND_AUTO_CREATE);
Intent intent = getIntent();
recipientId = intent.getStringExtra("RECIPIENT_ID");
name=intent.getStringExtra("name");
setTitle(name);
currentUserId = ParseUser.getCurrentUser().getObjectId();
// Store app language and version
ParseInstallation installation = ParseInstallation.getCurrentInstallation();
installation.put("userI", currentUserId);
installation.saveInBackground();
messagesList = (ListView) findViewById(R.id.listMessages);
messageAdapter = new MessageAdapter(this);
messagesList.setAdapter(messageAdapter);
populateMessageHistory();
messageBodyField = (EditText) findViewById(R.id.messageBodyField);
findViewById(R.id.sendButton).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
sendMessage();
}
});
}
//get previous messages from parse & display
private void populateMessageHistory() {
String[] userIds = {currentUserId, recipientId};
ParseQuery<ParseObject> query = ParseQuery.getQuery("ParseMessage") ;
query.whereContainedIn("senderId", Arrays.asList(userIds));
query.whereContainedIn("recipientId", Arrays.asList(userIds));
query.orderByAscending("createdAt");
query.findInBackground(new FindCallback<ParseObject>() {
@Override
public void done(List<ParseObject> messageList, com.parse.ParseException e) {
if (e == null) {
for (int i = 0; i < messageList.size(); i++) {
WritableMessage message = new WritableMessage(messageList.get(i).get("recipientId").toString(), messageList.get(i).get("messageText").toString());
if (messageList.get(i).get("senderId").toString().equals(currentUserId)) {
messageAdapter.addMessage(message, MessageAdapter.DIRECTION_OUTGOING);
} else {
messageAdapter.addMessage(message, MessageAdapter.DIRECTION_INCOMING);
}
}
}
}
});
}
private void sendMessage() {
messageBody = messageBodyField.getText().toString();
if (messageBody.isEmpty()) {
Toast.makeText(this, "Please enter a message", Toast.LENGTH_LONG).show();
return;
}
messageService.sendMessage(recipientId, messageBody);
messageBodyField.setText("");
}
@Override
public void onDestroy() {
messageService.removeMessageClientListener(messageClientListener);
unbindService(serviceConnection);
super.onDestroy();
}
private class MyServiceConnection implements ServiceConnection {
@Override
public void onServiceConnected(ComponentName componentName, IBinder iBinder) {
messageService = (MessageService.MessageServiceInterface) iBinder;
messageService.addMessageClientListener(messageClientListener);
}
@Override
public void onServiceDisconnected(ComponentName componentName) {
messageService = null;
}
}
private class MyMessageClientListener implements MessageClientListener {
@Override
public void onMessageFailed(MessageClient client, Message message,
MessageFailureInfo failureInfo) {
Toast.makeText(MessagingActivity.this, "Message failed to send.", Toast.LENGTH_LONG).show();
}
@Override
public void onIncomingMessage(MessageClient client, Message message) {
if (message.getSenderId().equals(recipientId)) {
// Toast.makeText(getApplicationContext(),"message",Toast.LENGTH_SHORT).show();
WritableMessage writableMessage = new WritableMessage(message.getRecipientIds().get(0), message.getTextBody());
messageAdapter.addMessage(writableMessage, MessageAdapter.DIRECTION_INCOMING);
}
}
@Override
public void onMessageSent(MessageClient client, Message message, final String recipientId) {
final WritableMessage writableMessage = new WritableMessage(message.getRecipientIds().get(0), message.getTextBody());
messageAdapter.addMessage(writableMessage, MessageAdapter.DIRECTION_OUTGOING);
//only add message to parse database if it doesn't already exist there
ParseQuery<ParseObject> query = ParseQuery.getQuery("ParseMessage");
query.whereEqualTo("sinchId", message.getMessageId());
query.findInBackground(new FindCallback<ParseObject>() {
@Override
public void done(List<ParseObject> messageList, com.parse.ParseException e) {
if (e == null) {
if (messageList.size() == 0) {
ParseObject parseMessage = new ParseObject("ParseMessage");
parseMessage.put("senderId", currentUserId);
parseMessage.put("recipientId", writableMessage.getRecipientIds().get(0));
parseMessage.put("messageText", writableMessage.getTextBody());
parseMessage.put("sinchId", writableMessage.getMessageId());
parseMessage.put("read",false);
parseMessage.saveInBackground();
// messageAdapter.addMessage(writableMessage, MessageAdapter.DIRECTION_OUTGOING);
ParseUser user = ParseUser.getCurrentUser();
String name = user.getUsername();
// Create our Installation query
ParseQuery pushQuery = ParseInstallation.getQuery();
pushQuery.whereEqualTo("userI", writableMessage.getRecipientIds().get(0));
// Send push notification to query
ParsePush push = new ParsePush();
push.setQuery(pushQuery); // Set our Installation query
push.setMessage("Message from"+ name +writableMessage.getTextBody());
push.sendInBackground();
}
}
}
});
}
@Override
public void onMessageDelivered(MessageClient client, MessageDeliveryInfo deliveryInfo) {
Toast.makeText(getApplicationContext(),"delivered",Toast.LENGTH_SHORT).show();
}
@Override
public void onShouldSendPushData(MessageClient client, Message message, List<PushPair> pushPairs) {}
}
}
答案 0 :(得分：0)
您可以向数据库添加新列，以跟踪对话是否包含未读消息。每当有新消息到达时，您可以通过将此列设置为true将对话标记为未读或待处理。 构建列表时，如果对话具有未读消息，请使适配器检查此列并更新生成的列表视图。 当用户打开对话时，将列更新为false。
首先，我建议您使用带有CursorLoader的ListView： http://developer.android.com/guide/topics/ui/layout/listview.html
每当您的内容提供商发生变化时，都会通知您的适配器。当它循环遍历构建每个列表项View的光标时，检查所需的列。如果已设置，则在该视图上设置您喜欢的任何内容，以表明它未读。