Make manual shorebird update actually work

Restarting just the activity doesn't seem to work.
To work around this, I finished the process and started the activity via alarm manager.
This is inspired from ProcessPhoenix

android/app/src/main/AndroidManifest.xml

@@ -17,6 +17,13 @@
                  the Android process has started. This theme is visible to the user
                  while the Flutter UI initializes. After that, this theme continues
                  to determine the Window background behind the Flutter UI. -->
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+                <category android:name="android.intent.category.DEFAULT" />
+                <category android:name="android.intent.category.HOME" />
+            </intent-filter>
             <meta-data
               android:name="io.flutter.embedding.android.NormalTheme"
               android:resource="@style/NormalTheme"

android/app/src/main/kotlin/org/fnives/flutter/experiment_shorebird/MainActivity.kt

@@ -1,5 +1,55 @@
 package org.fnives.flutter.experiment_shorebird
 
+import android.app.Activity
+import android.app.AlarmManager
+import android.app.PendingIntent
+import android.content.Intent
 import io.flutter.embedding.android.FlutterActivity
+import io.flutter.embedding.engine.FlutterEngine
+import io.flutter.plugin.common.MethodChannel
 
-class MainActivity: FlutterActivity()
+
+class MainActivity : FlutterActivity() {
+    private val channel = "MainChannel"
+
+    override fun configureFlutterEngine(flutterEngine: FlutterEngine) {
+        super.configureFlutterEngine(flutterEngine)
+        MethodChannel(
+            flutterEngine.dartExecutor.binaryMessenger,
+            channel
+        ).setMethodCallHandler { call, result ->
+            when (call.method) {
+                Methods.RESTART.methodName -> {
+                    val pendingIntent = PendingIntent.getActivity(
+                        context,
+                        4201,
+                        if (isHomeApp()) Intent(intent.action).apply {
+                            flags = Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS
+                            intent.categories.forEach {
+                                addCategory(it)
+                            }
+                        } else Intent(this, this::class.java).apply {
+                            flags = Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS
+                        },
+                        PendingIntent.FLAG_CANCEL_CURRENT or PendingIntent.FLAG_IMMUTABLE
+                    )
+                    val alarmManager = context.getSystemService(ALARM_SERVICE) as AlarmManager
+                    alarmManager[AlarmManager.RTC, System.currentTimeMillis() + 100] =
+                        pendingIntent
+                    if (context is Activity) {
+                        (context as Activity).finishAndRemoveTask()
+                    }
+                    Runtime.getRuntime().exit(0)
+                    result.success(Unit)
+                }
+            }
+        }
+    }
+
+    private fun isHomeApp(): Boolean {
+        val intent = Intent(Intent.ACTION_MAIN)
+        intent.addCategory(Intent.CATEGORY_HOME)
+        val res = packageManager.resolveActivity(intent, 0)
+        return res?.activityInfo != null && (packageName == res.activityInfo.packageName)
+    }
+}

android/app/src/main/kotlin/org/fnives/flutter/experiment_shorebird/Methods.kt

@@ -0,0 +1,7 @@
+package org.fnives.flutter.experiment_shorebird
+
+enum class Methods(val methodName: String) {
+    RESTART("restart");
+
+
+}