我开发了一个应用程序，其中一个功能是校长的更新通知。为此，我使用Firebase实时数据库。我希望该应用程序在添加新的孩子（消息）时自动发送通知（后台）。
这是我读取代码（swift）：
var messages = [Message]()
override func viewDidLoad() {
super.viewDidLoad()
observeMessages()
}
func observeMessages() {
let dbRef = FIRDatabase.database().reference().child("messageS")
dbRef.observe(.childAdded, with: { (snapshot) in
if let dictionary = snapshot.value as? [String: AnyObject] {
let text = Message()
text.setValuesForKeys(dictionary)
self.messages.insert(text, at: 0)
DispatchQueue.main.async(execute: {
self.tableView.reloadData()
})
}
}, withCancel: nil)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
// MARK: - Table view data source
override func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return messages.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = UITableViewCell(style: .subtitle, reuseIdentifier: "cellId")
let message = messages[indexPath.row]
cell.textLabel?.text = message.title
cell.textLabel?.textAlignment = .center
cell.detailTextLabel?.text = message.message
cell.detailTextLabel?.textAlignment = .right
// Configure the cell...
return cell
}
override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
let message = messages[indexPath.row]
let title = message.title
let msg = message.message
let controller = UIAlertController(title: title, message: msg, preferredStyle: .alert)
let cancelAction = UIAlertAction(title: "סגור", style: .cancel) { (handler) in
// Any action when you cancel
}
controller.addAction(cancelAction)
self.present(controller, animated: true, completion: nil)
}
这是我的 Swift 代码：
@IBOutlet weak var MessageTitle: UITextField!
@IBOutlet weak var MessageText: UITextField!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view.
}
func post() {
let title: String = MessageTitle.text!
let message: String = MessageText.text!
let post: [String: AnyObject] = ["title": title as AnyObject,
"message": message as AnyObject]
let dbRef = FIRDatabase.database().reference()
dbRef.child("messageS").childByAutoId().setValue(post)
}
@IBAction func Publish(_ sender: AnyObject) {
post()
let MessageSent = UIAlertController(title: "נשלח", message: "ההודעה נשלחה בהצלחה", preferredStyle: UIAlertControllerStyle.alert)
MessageSent.addAction(UIAlertAction(title: "תודה", style: UIAlertActionStyle.default, handler: nil))
self.present(MessageSent, animated: true, completion: nil)
}
这是我的阅读代码（Android）：
private Firebase mRef;
public ArrayList<String> messages = new ArrayList<>();
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_updates);
mRef = new Firebase("https://ksharet-d6a24.firebaseio.com");
mRef.child("messageS");
// Get ListView object from xml
final ListView listView = (ListView) findViewById(R.id.ListView);
// Create a new Adapter
final ArrayAdapter<String> adapter = new ArrayAdapter<>(this,
android.R.layout.simple_list_item_1, messages);
// Assign adapter to ListView
listView.setAdapter(adapter);
mRef.addChildEventListener(new ChildEventListener() {
@Override
public void onChildAdded(DataSnapshot dataSnapshot, String s) {
for (DataSnapshot postSnapshot : dataSnapshot.getChildren()) {
Message message = postSnapshot.getValue(Message.class);
messages.add(0, message.getTitle() + '\n' + message.getMessage());
}
adapter.notifyDataSetChanged();
}
@Override
public void onChildChanged(DataSnapshot dataSnapshot, String s) {
}
@Override
public void onChildRemoved(DataSnapshot dataSnapshot) {
}
@Override
public void onChildMoved(DataSnapshot dataSnapshot, String s) {
}
@Override
public void onCancelled(FirebaseError firebaseError) {
}
});
}
这是我编写的 Android 代码：
private Button sendData;
private Firebase mRef;
private EditText messageBox = (EditText) findViewById(R.id.MessageText);
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_publish);
Firebase.setAndroidContext(this);
mRef = new Firebase("https://ksharet-d6a24.firebaseio.com/");
mRef.child("message");
sendData = (Button) findViewById(R.id.sendMessage);
sendData.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String message = messageBox.getText().toString();
//Firebase mRefChild = mRef.child("message");
//mRefChild.setValue(message);
mRef.push().setValue(message);
}
});
}
我应该在代码中创建或更改什么（如果可以的话，针对iOS和Android）。 我最近购买了苹果开发者计划会员资格，很快就会激活。
感谢各位帮手。