Assignment 07

app/src/main/AndroidManifest.xml

@@ -2,6 +2,7 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools">
 
+    <uses-permission android:name="android.permission.POST_NOTIFICATIONS" />
     <application
         android:allowBackup="true"
         android:dataExtractionRules="@xml/data_extraction_rules"

app/src/main/java/com/example/assignment02/CountFragment.kt

@@ -1,5 +1,6 @@
 package com.example.assignment02
 
+import android.app.Notification
 import android.os.Bundle
 import android.view.LayoutInflater
 import android.view.View
@@ -8,13 +9,25 @@ import android.widget.Button
 import android.widget.TextView
 import android.widget.Toast
 import androidx.fragment.app.Fragment
-import android.content.DialogInterface;
-import androidx.appcompat.app.AlertDialog;
-import androidx.appcompat.app.AppCompatActivity;
+import androidx.appcompat.app.AlertDialog
+import android.Manifest
+import android.app.NotificationChannel
+import android.app.NotificationManager
+import android.app.PendingIntent
+import android.content.Context
+import android.content.Intent
+import android.content.pm.PackageManager
+import android.os.Build
+import androidx.activity.result.contract.ActivityResultContracts
+import androidx.core.app.ActivityCompat
+import androidx.core.app.NotificationCompat
+import androidx.core.app.NotificationManagerCompat
+
 
 class CountFragment : Fragment() {
 
     private lateinit var numberText: TextView
+    private lateinit var notification: Notification
     private var currentNumber: Int = 0
 
     override fun onCreateView(
@@ -39,16 +52,80 @@ class CountFragment : Fragment() {
             showAlertDialog()
         }
         randomButton.setOnClickListener {
-            val randomFragment = RandomFragment.newInstance(currentNumber)
-            requireActivity().supportFragmentManager.beginTransaction()
-                .replace(R.id.fragment_container, randomFragment)
-                .addToBackStack(null)
-                .commit()
+            // 숫자 전달을 위한 Intent 생성
+            val intent = Intent(context, MainActivity::class.java).apply {
+                putExtra("number", currentNumber) // 데이터를 Intent에 추가
+                putExtra("Notification", true) // Notification 여부 플래그 추가
+            }
+            val pendingIntent: PendingIntent = PendingIntent.getActivity(
+                context,
+                0,
+                intent,
+                PendingIntent.FLAG_UPDATE_CURRENT or PendingIntent.FLAG_IMMUTABLE
+            )
+
+            notification = context?.let { it1 ->
+                NotificationCompat.Builder(it1, "assignment-7")
+                    .setSmallIcon(android.R.drawable.ic_notification_overlay)
+                    .setContentTitle("랜덤 숫자 (0 ~ " + currentNumber + ")")
+                    .setContentText("새로운 랜덤 숫자가 생성되었습니다.")
+                    .setPriority(NotificationCompat.PRIORITY_DEFAULT)
+                    .setContentIntent(pendingIntent) // 클릭 시 실행
+                    .setAutoCancel(true) // 클릭 후 알림 자동 제거
+                    .build()
+            }!!
+
+            showNotification()
         }
 
         return view
     }
 
+    private fun createNotificationChannel() {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+            val name = "Assignment Notification"
+            val descriptionText = "Channel for Assignment notifications"
+            val importance = NotificationManager.IMPORTANCE_DEFAULT
+            val channel = NotificationChannel("assignment-7", name, importance).apply {
+                description = descriptionText
+            }
+            // NotificationManager에 채널 등록
+            val notificationManager: NotificationManager =
+                requireContext().getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
+            notificationManager.createNotificationChannel(channel)
+        }
+    }
+
+    private val requestPermissionLauncher = registerForActivityResult(
+        ActivityResultContracts.RequestPermission()
+    ) { isGranted: Boolean ->
+        if (isGranted) {
+            // 권한이 허용된 경우 알림 표시
+            showNotification()
+        } else {
+            // 권한이 거부된 경우 처리
+            println("Notification permission denied")
+        }
+    }
+
+    // 권한등을 채크하고 Notification을 보낸다.
+    private fun showNotification() {
+        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.TIRAMISU) {
+            // Android 13 이상에서는 POST_NOTIFICATIONS 권한 확인
+            if (ActivityCompat.checkSelfPermission(
+                    requireContext(),
+                    Manifest.permission.POST_NOTIFICATIONS
+                ) != PackageManager.PERMISSION_GRANTED
+            ) {
+                requestPermissionLauncher.launch(Manifest.permission.POST_NOTIFICATIONS)
+                return
+            }
+        }
+
+        // 권한이 있거나 Android 12 이하인 경우 알림 표시
+        NotificationManagerCompat.from(requireContext()).notify(1, notification)
+    }
+
     private fun showAlertDialog() {
         // Fragment에서는 requireContext()를 사용하여 컨텍스트를 가져옴
         val builder = AlertDialog.Builder(requireContext())
@@ -84,4 +161,4 @@ class CountFragment : Fragment() {
             return fragment
         }
     }
-}
+}

app/src/main/java/com/example/assignment02/MainActivity.kt

@@ -2,17 +2,28 @@ package com.example.assignment02
 
 import androidx.appcompat.app.AppCompatActivity
 import android.os.Bundle
+import androidx.fragment.app.Fragment
 
 class MainActivity : AppCompatActivity() {
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         setContentView(R.layout.activity_main)
 
-        if (savedInstanceState == null) {
-            supportFragmentManager.beginTransaction()
-                .replace(R.id.fragment_container, CountFragment.newInstance(0))
-                .commit()
+        val isFromNotification = intent?.getBooleanExtra("Notification", false) ?: false
+        val data = intent?.getIntExtra("number", 0) ?: 0
+
+        val fragment: Fragment = if (isFromNotification) {
+            // Notification을 통해 실행된 경우 FragmentB 로드 및 데이터 전달
+            RandomFragment.newInstance(data)
+        } else {
+            // 기본적으로 FragmentA 로드
+            CountFragment.newInstance(0)
         }
+
+        // 선택된 Fragment를 동적으로 할당
+        supportFragmentManager.beginTransaction()
+            .replace(R.id.fragment_container, fragment)
+            .commit()
     }
 }

app/src/main/java/com/example/assignment02/RandomFragment.kt

@@ -39,7 +39,9 @@ class RandomFragment : Fragment() {
             currentNumber = it.getInt("randomNumber", 0)
         }
 
-        currentNumber = (0..currentNumber-1).random()
+        if (currentNumber>=1) {
+            currentNumber = (0..currentNumber - 1).random()
+        }
         number_number.text = currentNumber.toString()
 
         requireActivity().onBackPressedDispatcher.addCallback(viewLifecycleOwner) {
@@ -51,4 +53,4 @@ class RandomFragment : Fragment() {
                 .commit()
         }
     }
-}
+}