我创建了一个应用程序，使用Sinch实现应用程序调用app。它仅在调用者知道收件人的名称时才有效。
要克服这个Sinch建议使用PubNub来获取用户状态。他们也有一个tutorial here.问题是教程已经过时，PubNub已经更新了他们的API。我尝试使用他们自己的新API使用他们的文档来实现这些功能，但它不起作用或更准确，我不知道该怎么做。
我目前的代码是：
public class LoggedUsers extends Activity {
private PubNub pubNub;
String name;
private ArrayList users;
private JSONArray loggedUserList;
ListView UserList;
TextView allUsers;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.user_list);
allUsers = (TextView) findViewById(R.id.JSONFromPubNub);
SharedPreferences sp = getSharedPreferences("User_Details", MODE_APPEND);
try {
name = sp.getString("UserName", "");
} catch (NullPointerException e) {
}
final PNConfiguration pnc = new PNConfiguration();
pnc.setPublishKey("publish key");
pnc.setSubscribeKey("subscribe key");
pnc.setUuid(name);
pubNub = new PubNub(pnc);
users = new ArrayList<String>();
UserList = (ListView) findViewById(R.id.listView);
String user = getUserStatus();
allUsers.setText(user);
final ArrayAdapter adapter = new ArrayAdapter(getApplicationContext(), R.layout.single_item_list, users);
UserList.setAdapter(adapter);
pubNub.addListener(new SubscribeCallback() {
@Override
public void status(PubNub pubnub, PNStatus status) {
if (status.getCategory() == PNStatusCategory.PNUnexpectedDisconnectCategory) {
// This event happens when radio / connectivity is lost
HashMap <String,String> map = new HashMap();
map.put("State","Offline");
pubNub.setPresenceState().channels(Arrays.asList("CallingChannel1")).state(map).uuid(pnc.getUuid());
} else if (status.getCategory() == PNStatusCategory.PNConnectedCategory) {
// Connect event. You can do stuff like publish, and know you'll get it.
// Or just use the connected event to confirm you are subscribed for
// UI / internal notifications, etc
HashMap <String,String> map = new HashMap();
map.put("State","Online");
pubNub.setPresenceState().channels(Arrays.asList("CallingChannel1")).state(map).uuid(pnc.getUuid());
/* if (status.getCategory() == PNStatusCategory.PNConnectedCategory) {
pubnub.publish().channel("awesomeChannel").message("hello!!").async(new PNCallback<PNPublishResult>() {
@Override
public void onResponse(PNPublishResult result, PNStatus status) {
// Check whether request successfully completed or not.
if (!status.isError()) {
// Message successfully published to specified channel.
}
// Request processing failed.
else {
// Handle message publish error. Check 'category' property to find out possible issue
// because of which request did fail.
//
// Request can be resent using: [status retry];
}
}
});
}*/
} else if (status.getCategory() == PNStatusCategory.PNReconnectedCategory) {
HashMap <String,String> map = new HashMap();
map.put("State","Online");
pubNub.setPresenceState().channels(Arrays.asList("CallingChannel1")).state(map).uuid(pnc.getUuid());
// Happens as part of our regular operation. This event happens when
// radio / connectivity is lost, then regained.
} else if (status.getCategory() == PNStatusCategory.PNDecryptionErrorCategory) {
// Handle messsage decryption error. Probably client configured to
// encrypt messages and on live data feed it received plain text.
}
}
@Override
public void message(PubNub pubnub, PNMessageResult message) {
}
@Override
public void presence(PubNub pubnub, PNPresenceEventResult presence) {
}
});
}
public String getUserStatus(){
final StringBuilder allUsers = new StringBuilder();
pubNub.subscribe().channels(Arrays.asList("CallingChannel1")).withPresence().execute();
pubNub.hereNow()
// tailor the next two lines to example
.channels(Arrays.asList("CallingChannel1"))
.includeState(true)
.includeUUIDs(true)
.async(new PNCallback<PNHereNowResult>() {
@Override
public void onResponse(PNHereNowResult result, PNStatus status) {
if (status.isError()) {
// handle error
return;
}
for (PNHereNowChannelData channelData : result.getChannels().values()) {
allUsers.append("---");
allUsers.append("channel:" + channelData.getChannelName());
allUsers.append("occoupancy: " + channelData.getOccupancy());
allUsers.append("occupants:");
for (PNHereNowOccupantData occupant : channelData.getOccupants()) {
allUsers.append("uuid: " + occupant.getUuid() + " state: " + occupant.getState());
}
}
}
});
return allUsers.toString();
}
@Override
protected void onResume() {
super.onResume();
}
}
以下是我的问题：
我正在尝试显示我在textview中收到的所有数据（稍后它会安排在listview或者回收站视图中），但是我得到一个空白的屏幕，所以我从服务器上获取了null。 / p>
应不断更新用户状态，以了解用户是否更改状态（在线 - >离线），但代码中似乎没有async次调用，因此我认为会执行只有一次，然后数据集没有被更改。
我如何解决我的问题？
答案 0 :(得分：1)
您可以使用PubNub Presence监控在线和状态变化。订阅时，订阅并启用状态，您将获得state-change，join，leave＆amp; timeout events in the presence callback。
Callback callback = new Callback() {
@Override
public void successCallback(String channel, Object message) {
System.out.println(channel + " : "
+ message.getClass() + " : " + message.toString());
// take action on the presence events here
}
@Override
public void connectCallback(String channel, Object message) {
System.out.println("CONNECT on channel:" + channel
+ " : " + message.getClass() + " : "
+ message.toString());
}
@Override
public void disconnectCallback(String channel, Object message) {
System.out.println("DISCONNECT on channel:" + channel
+ " : " + message.getClass() + " : "
+ message.toString());
}
@Override
public void reconnectCallback(String channel, Object message) {
System.out.println("RECONNECT on channel:" + channel
+ " : " + message.getClass() + " : "
+ message.toString());
}
@Override
public void errorCallback(String channel, PubnubError error) {
System.out.println("ERROR on channel " + channel
+ " : " + error.toString());
}
};
try {
pubnub.presence("my_channel", callback);
}
catch (PubnubException e) {
System.out.println(e.toString());
}
看来Sinch正在使用相当旧版本的PubNub Android SDK。我认为你仍然可以使用PubNub Android SDK v4在Sinch SDK之外做你需要做的事情，除非Sinch有一些明确的要求使用相同版本的SDK。