Use RestartActivity to speed up the restart

android/app/src/main/AndroidManifest.xml

@@ -1,17 +1,18 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android">
+
     <uses-permission android:name="android.permission.INTERNET" />
     <application
-        android:label="experiment_shorebird"
         android:name="${applicationName}"
-        android:icon="@mipmap/ic_launcher">
+        android:icon="@mipmap/ic_launcher"
+        android:label="experiment_shorebird">
         <activity
             android:name=".MainActivity"
+            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
             android:exported="true"
+            android:hardwareAccelerated="true"
             android:launchMode="singleTop"
             android:taskAffinity=""
             android:theme="@style/LaunchTheme"
-            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|smallestScreenSize|locale|layoutDirection|fontScale|screenLayout|density|uiMode"
-            android:hardwareAccelerated="true"
             android:windowSoftInputMode="adjustResize">
             <!-- Specifies an Android theme to apply to this Activity as soon as
                  the Android process has started. This theme is visible to the user
@@ -26,13 +27,19 @@
             </intent-filter>
             <meta-data
                 android:name="io.flutter.embedding.android.NormalTheme"
-              android:resource="@style/NormalTheme"
+                android:resource="@style/NormalTheme" />
-              />
             <intent-filter>
-                <action android:name="android.intent.action.MAIN"/>
+                <action android:name="android.intent.action.MAIN" />
-                <category android:name="android.intent.category.LAUNCHER"/>
+                <category android:name="android.intent.category.LAUNCHER" />
             </intent-filter>
         </activity>
+        <activity
+            android:name=".RestartActivity"
+            android:exported="false"
+            android:process=":restart"
+            android:excludeFromRecents="true"
+            android:noHistory="true"
+            android:theme="@android:style/Theme.Translucent.NoTitleBar" />
         <!-- Don't delete the meta-data below.
              This is used by the Flutter tool to generate GeneratedPluginRegistrant.java -->
         <meta-data
@@ -46,8 +53,8 @@
          In particular, this is used by the Flutter engine in io.flutter.plugin.text.ProcessTextPlugin. -->
     <queries>
         <intent>
-            <action android:name="android.intent.action.PROCESS_TEXT"/>
+            <action android:name="android.intent.action.PROCESS_TEXT" />
-            <data android:mimeType="text/plain"/>
+            <data android:mimeType="text/plain" />
         </intent>
     </queries>
 </manifest>

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

@@ -22,15 +22,13 @@ class MainActivity : FlutterActivity() {
                     try {
                         if (this.intent.categories.contains(Intent.CATEGORY_HOME)) {
                             if (isDefaultHomeApp()) {
-                                runViaAlarmManager(getHomeIntent())
+                                RestartActivity.restart(this, getHomeIntent())
                             } else {
-                                runViaAlarmManager(Intent.makeRestartActivityTask(componentName))
+                                RestartActivity.restart(this, Intent.makeRestartActivityTask(componentName))
                             }
                         } else {
-                            runDirectly(Intent.makeRestartActivityTask(componentName))
+                            RestartActivity.restart(this, Intent.makeRestartActivityTask(componentName))
                         }
-                        finishAndRemoveTask()
-                        Runtime.getRuntime().exit(0)
                         result.success(null)
                     } catch (e: Throwable) {
                         result.error("couldn't start activity", e.message ?: "", null)
@@ -49,21 +47,6 @@ class MainActivity : FlutterActivity() {
             }
         }
 
-    private fun runDirectly(intent: Intent) {
-        context.startActivity(intent)
-    }
-
-    private fun runViaAlarmManager(intent: Intent) {
-        val pendingIntent = PendingIntent.getActivity(
-            context,
-            4201,
-            intent,
-            PendingIntent.FLAG_CANCEL_CURRENT or PendingIntent.FLAG_IMMUTABLE
-        )
-        val alarmManager = context.getSystemService(ALARM_SERVICE) as AlarmManager
-        alarmManager[AlarmManager.RTC, System.currentTimeMillis()+100] = pendingIntent
-    }
-
     private fun isDefaultHomeApp(): Boolean {
         val intent = Intent(Intent.ACTION_MAIN)
         intent.addCategory(Intent.CATEGORY_HOME)

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

@@ -0,0 +1,40 @@
+package org.fnives.flutter.experiment_shorebird
+
+import android.app.Activity
+import android.content.Context
+import android.content.Intent
+import android.os.Build
+import android.os.Bundle
+import android.os.Process
+
+const val KEY_ORIGINAL_PID = "KEY_ORIGINAL_PID"
+const val KEY_INTENT = "KEY_INTENT"
+
+class RestartActivity : Activity() {
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+
+        Process.killProcess(intent.getIntExtra(KEY_ORIGINAL_PID, -1))
+
+        val intent = if (Build.VERSION.SDK_INT > 33) {
+            intent.getParcelableExtra(KEY_INTENT, Intent::class.java)
+        } else {
+            @Suppress("DEPRECATION")
+            intent.getParcelableExtra(KEY_INTENT)
+        }
+
+        startActivity(intent)
+        finish()
+    }
+
+    companion object {
+        fun restart(context: Context, intent: Intent) {
+            val restartIntent = Intent(context, RestartActivity::class.java)
+            restartIntent.addFlags(Intent.FLAG_ACTIVITY_EXCLUDE_FROM_RECENTS)
+            restartIntent.putExtra(KEY_ORIGINAL_PID, Process.myPid())
+            restartIntent.putExtra(KEY_INTENT, intent)
+            context.startActivity(restartIntent)
+        }
+    }
+}

lib/main.dart

@@ -152,7 +152,7 @@ class _MyHomePageState extends State<MyHomePage> {
           mainAxisAlignment: MainAxisAlignment.center,
           children: <Widget>[
             const Text(
-              'This is a release 1.9.9#6',
+              'This is a release 1.9.12#3',
               // 'You have times:',
             ),
             const Text(

pubspec.yaml

@@ -16,7 +16,7 @@ publish_to: 'none' # Remove this line if you wish to publish to pub.dev
 # https://developer.apple.com/library/archive/documentation/General/Reference/InfoPlistKeyReference/Articles/CoreFoundationKeys.html
 # In Windows, build-name is used as the major, minor, and patch parts
 # of the product and file versions while build-number is used as the build suffix.
-version: 1.9.9+199
+version: 1.9.12+202
 
 environment:
   sdk: '>=3.4.3 <4.0.0'