A more robust self hosted OTA updates implementation

android/app/src/main/AndroidManifest.xml

@@ -71,6 +71,16 @@
             android:name="id.flutter.flutter_background_service.BackgroundService"
             android:foregroundServiceType="location"
             tools:replace="android:foregroundServiceType" />
+        <!-- FileProvider for OTA plugin (ota_update) -->
+        <provider
+            android:name="androidx.core.content.FileProvider"
+            android:authorities="${applicationId}.ota_update_provider"
+            android:exported="false"
+            android:grantUriPermissions="true">
+            <meta-data
+                android:name="android.support.FILE_PROVIDER_PATHS"
+                android:resource="@xml/ota_update_file_paths" />
+        </provider>
     </application>
     <!-- Required to query activities that can process text, see:
          https://developer.android.com/training/package-visibility and

android/app/src/main/kotlin/com/example/tasq/MainActivity.kt

@@ -1,5 +1,49 @@
 package com.example.tasq
 
 import io.flutter.embedding.android.FlutterFragmentActivity
+import io.flutter.embedding.engine.FlutterEngine
+import io.flutter.plugin.common.MethodChannel
+import android.content.Intent
+import android.net.Uri
+import androidx.core.content.FileProvider
+import java.io.File
 
-class MainActivity : FlutterFragmentActivity()
+class MainActivity : FlutterFragmentActivity() {
+	private val CHANNEL = "tasq/ota"
+
+	override fun configureFlutterEngine(flutterEngine: FlutterEngine) {
+		super.configureFlutterEngine(flutterEngine)
+		MethodChannel(flutterEngine.dartExecutor.binaryMessenger, CHANNEL).setMethodCallHandler { call, _ ->
+			when (call.method) {
+				"openUnknownSources" -> {
+					try {
+						val intent = Intent(android.provider.Settings.ACTION_MANAGE_UNKNOWN_APP_SOURCES)
+						intent.data = Uri.parse("package:" + applicationContext.packageName)
+						intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
+						applicationContext.startActivity(intent)
+					} catch (e: Exception) {
+						// ignore and return
+					}
+				}
+				"installApk" -> {
+					try {
+						val path = call.argument<String>("path") ?: return@setMethodCallHandler
+						val file = File(path)
+						val authority = applicationContext.packageName + ".ota_update_provider"
+						val uri = FileProvider.getUriForFile(applicationContext, authority, file)
+						val intent = Intent(Intent.ACTION_VIEW)
+						intent.setDataAndType(uri, "application/vnd.android.package-archive")
+						intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
+						intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION)
+						applicationContext.startActivity(intent)
+					} catch (e: Exception) {
+						// ignore - caller will surface error
+					}
+				}
+				else -> {
+					// no-op
+				}
+			}
+		}
+	}
+}

android/app/src/main/res/xml/ota_update_file_paths.xml

@@ -0,0 +1,9 @@
+<?xml version="1.0" encoding="utf-8"?>
+<paths xmlns:android="http://schemas.android.com/apk/res/android">
+    <!-- Allow access to common app storage locations used by OTA plugin -->
+    <external-path name="external_files" path="." />
+    <external-files-path name="external_files_app" path="." />
+    <cache-path name="cache" path="." />
+    <external-cache-path name="external_cache" path="." />
+    <files-path name="files" path="." />
+</paths>