『Android』Notification 通知

Android API 26 也就是 Version_O 之後有多一個頻道Channel的參數
在設計時要多一個版本的判斷

建立NotificationManager

val manager = (getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager)

判斷當前手機版本並建立頻道(API 26 以上）

val channelID = "School"
val channelName = "Mr.Bob" 
if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.O){
          val channelSchool = NotificationChannel(
              channelID,
              channelName,
              NotificationManager.IMPORTANCE_DEFAULT
          ).apply {
              description = "Description"
              enableLights(true)
              enableVibration(true)
          }
          manager.createNotificationChannel(channelSchool)
}

建立 Notification ,這裡使用AndroidX裡面的 NotificationCompat.Builder()
是為了兼容所有版本.
Builder一開始填channel id 也沒關係 .

val notification = NotificationCompat.Builder(this,channelID)
          .setSmallIcon(R.drawable.ic_launcher_foreground)
          .setContentTitle("<<Tile>>")
          .setContentText("Text")
          .setSubText("SubText")
          .setWhen(System.currentTimeMillis())
          .build()

Result

點擊通知後跳轉頁面 Desktop -> MainActivity ,

val intent = Intent(this,MainActivity::class.java)
val pendingIntent = PendingIntent.getActivity(this,0,intent,PendingIntent.FLAG_UPDATE_CURRENT)
.
.
.
val notification = NotificationCompat.Builder(this,channelID)
          .setSmallIcon(R.drawable.ic_launcher_foreground)
          .
          . //跟上面一樣
          .
          .setContentIntent(pendingIntent)
          .setWhen(System.currentTimeMillis())
          .build()

Result
點擊通知後跳轉頁面 Desktop -> MainActivity -> MainActivity2
新建一個MainActivity2,在AndroidManifest.xml設置,
告訴手機說我要跳到MainActivity2,按返回時會回到MainAcitvity
```
  <activity
          android:name=".MainActivity2"
          android:exported="true"
          android:parentActivityName=".MainActivity"
          />
```

在設計通知的地方要修改

修改前
val intent = Intent(this,MainActivity::class.java)
val pendingIntent = PendingIntent.getActivity(this,0,intent,PendingIntent.FLAG_UPDATE_CURRENT)

修改後
val intent = Intent(this,MainActivity2::class.java)
val stackBuilder = TaskStackBuilder.create(this).apply {
      addNextIntentWithParentStack(intent)
}
val pendingIntent = stackBuilder.getPendingIntent(0,PendingIntent.FLAG_UPDATE_CURRENT)