●補充說明--推播機制
1.不分android或ios，推播是推給系統，是GOOGLE 推給系統，先把要推播的內容給APP的SERVER，APP的SERVER會告訴GOOGLE SERVER要推給誰，GOOGLER SERVER再推給系統，再把APP叫出來
2.推播一定要有server，我們這邊用firebase，原理和運作方式如下
=>當安裝好app(ex:line)的時候會註冊帳號，會跟google說要一個推播token，要註冊這隻手機需要一個推播token，google就會回傳token，app會收到token
=>把token加上user id 傳到line 的server去，line要用資料庫存下來
=>以後要發訊息的時候，就要用token+訊息+app金鑰(key=>在google developer console申請的)
=>看到key就會知道是哪個app，看到token就會知道是哪支手機，這樣google就會送訊息過來
**同一支手機，不同app，token會一樣，所以token是綁手機
3.用firebase console做發送就沒有token問題，送推播就是一次送所有的人
●程式說明：
1.tools=>firebase
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2.cloud messaging
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3.SET UP FIREBASE CLOUD MESSAGING=>CONNECT
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連結時會跳出選擇授權goolge帳號，再回android studio設定Firebase project name
完成後右下角有出現這個訊息
4.點Add FCM to your app. FCM(firebase cloud message)的library=>加入gradle並且sync
5.app每次啟動時跟goolge要一個token，並且註冊到firebase
=>先new一個service:myfirebaseService
6.繼承FirebaseMessagingService，下面IBinder可以刪除
public class MyFirebaseService extends FirebaseMessagingService{
public MyFirebaseService() {
}
}
7.加入onMessageReceived
public class MyFirebaseService extends FirebaseInstanceIdService {
public MyFirebaseService() {
}
@Override
public void onMessageReceived(RemoteMessage remoteMessage) {
// ...
// TODO(developer): Handle FCM messages here.
// Not getting messages here? See why this may be: https://goo.gl/39bRNJ
Log.d(TAG, "From: " + remoteMessage.getFrom());
// Check if message contains a data payload.
if (remoteMessage.getData().size() > 0) {
Log.d(TAG, "Message data payload: " + remoteMessage.getData());
}
// Check if message contains a notification payload.
if (remoteMessage.getNotification() != null) {
Log.d(TAG, "Message Notification Body: " + remoteMessage.getNotification().getBody());
}
// Also if you intend on generating your own notifications as a result of a received FCM
// message, here is where that should be initiated. See sendNotification method below.
}
}
8.manifest加intent filter(已可收推播)
<intent-filter>
<action android:name="com.google.firebase.MESSAGING_EVENT" />
</intent-filter>
9.先離開app，到firebase找到該專案=>左側Cloud Messaging
11.輸入訊息=>審查=>發布
12.在手機收到
13.完成畫面
●程式參考(GitHub)：使用Google Firebase Cloud Messaging接收推播訊息
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