支持1.12版本新的android插件api

android/src/main/kotlin/com/apptreesoftware/barcodescan/BarcodeScanPlugin.kt

@@ -2,30 +2,40 @@ package com.apptreesoftware.barcodescan
 
 import android.app.Activity
 import android.content.Intent
+import io.flutter.embedding.engine.plugins.FlutterPlugin
+import io.flutter.embedding.engine.plugins.activity.ActivityAware
+import io.flutter.embedding.engine.plugins.activity.ActivityPluginBinding
+import io.flutter.plugin.common.MethodCall
 import io.flutter.plugin.common.MethodChannel
 import io.flutter.plugin.common.MethodChannel.MethodCallHandler
 import io.flutter.plugin.common.MethodChannel.Result
-import io.flutter.plugin.common.MethodCall
 import io.flutter.plugin.common.PluginRegistry
 import io.flutter.plugin.common.PluginRegistry.Registrar
 
-class BarcodeScanPlugin(val activity: Activity): MethodCallHandler,
-    PluginRegistry.ActivityResultListener {
-  var result : Result? = null
+class BarcodeScanPlugin(): MethodCallHandler, PluginRegistry.ActivityResultListener, FlutterPlugin, ActivityAware {
+  
+  private var result : Result? = null
+  private var channel: MethodChannel? = null
+  private var activity: Activity? = null
+
+  constructor(activity: Activity?) : this() {
+    this.activity = activity
+  }
+
   companion object {
     @JvmStatic
-    fun registerWith(registrar: Registrar): Unit {
+    fun registerWith(registrar: Registrar) {
       val channel = MethodChannel(registrar.messenger(), "com.apptreesoftware.barcode_scan")
-        if (registrar.activity() != null) {
-            val plugin = BarcodeScanPlugin(registrar.activity())
-            channel.setMethodCallHandler(plugin)
-            registrar.addActivityResultListener(plugin)
+      if (registrar.activity() != null) {
+        val plugin = BarcodeScanPlugin(registrar.activity())
+        channel.setMethodCallHandler(plugin)
+        registrar.addActivityResultListener(plugin)
       }  
     }
   }
 
-  override fun onMethodCall(call: MethodCall, result: Result): Unit {
-    if (call.method.equals("scan")) {
+  override fun onMethodCall(call: MethodCall, result: Result) {
+    if (call.method == "scan") {
       this.result = result
       showBarcodeView()
     } else {
@@ -34,8 +44,10 @@ class BarcodeScanPlugin(val activity: Activity): MethodCallHandler,
   }
 
   private fun showBarcodeView() {
-    val intent = Intent(activity, BarcodeScannerActivity::class.java)
-    activity.startActivityForResult(intent, 100)
+    activity?.let {
+      val intent = Intent(it, BarcodeScannerActivity::class.java)
+      it.startActivityForResult(intent, 100)
+    }
   }
 
   override fun onActivityResult(code: Int, resultCode: Int, data: Intent?): Boolean {
@@ -51,4 +63,30 @@ class BarcodeScanPlugin(val activity: Activity): MethodCallHandler,
     }
     return false
   }
+
+  override fun onAttachedToEngine(binding: FlutterPlugin.FlutterPluginBinding) {
+    channel = MethodChannel(binding.binaryMessenger, "com.apptreesoftware.barcode_scan")
+  }
+
+  override fun onDetachedFromEngine(binding: FlutterPlugin.FlutterPluginBinding) {
+    channel?.setMethodCallHandler(null)
+  }
+
+  override fun onAttachedToActivity(binding: ActivityPluginBinding) {
+    val plugin = BarcodeScanPlugin(binding.activity)
+    channel?.setMethodCallHandler(plugin)
+    binding.addActivityResultListener(plugin)
+  }
+
+  override fun onDetachedFromActivity() {
+
+  }
+
+  override fun onReattachedToActivityForConfigChanges(binding: ActivityPluginBinding) {
+    onAttachedToActivity(binding)
+  }
+
+  override fun onDetachedFromActivityForConfigChanges() {
+    onDetachedFromActivity()
+  }
 }

example/android/app/src/main/AndroidManifest.xml

@@ -16,19 +16,37 @@
         android:label="barcode_scan_example"
         android:icon="@mipmap/ic_launcher">
         <activity
-            android:name="com.apptreesoftware.barcodescanexample.MainActivity"
-            android:launchMode="singleTop"
-            android:theme="@style/LaunchTheme"
-            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|locale|layoutDirection|fontScale"
+            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|locale|layoutDirection"
             android:hardwareAccelerated="true"
+            android:exported="true"
+            android:launchMode="singleTop"
+            android:name="com.apptreesoftware.barcodescanexample.EmbeddingV1Activity"
+            android:theme="@style/LaunchTheme"
             android:windowSoftInputMode="adjustResize">
-            <!-- This keeps the window background of the activity showing
-                 until Flutter renders its first frame. It can be removed if
-                 there is no splash screen (such as the default splash screen
-                 defined in @style/LaunchTheme). -->
+
             <meta-data
                 android:name="io.flutter.app.android.SplashScreenUntilFirstFrame"
-                android:value="true" />
+                android:value="true"/>
+        </activity>
+
+        <activity
+            android:configChanges="orientation|keyboardHidden|keyboard|screenSize|locale|layoutDirection"
+            android:hardwareAccelerated="true"
+            android:launchMode="singleTop"
+            android:name="com.apptreesoftware.barcodescanexample.MainActivity"
+            android:theme="@style/LaunchTheme"
+            android:windowSoftInputMode="adjustResize">
+            <!-- Specify that the launch screen should continue being displayed -->
+            <!-- until Flutter renders its first frame. -->
+            <meta-data
+                android:name="io.flutter.embedding.android.SplashScreenDrawable"
+                android:resource="@drawable/launch_background" />
+
+            <!-- Theme to apply as soon as Flutter begins rendering frames -->
+            <meta-data
+                android:name="io.flutter.embedding.android.NormalTheme"
+                android:resource="@android:style/Theme.Black.NoTitleBar"
+                />
             <intent-filter>
                 <action android:name="android.intent.action.MAIN"/>
                 <category android:name="android.intent.category.LAUNCHER"/>

example/android/app/src/main/kotlin/com/apptreesoftware/barcodescanexample/EmbeddingV1Activity.kt

@@ -0,0 +1,12 @@
+package com.apptreesoftware.barcodescanexample
+
+import android.os.Bundle
+import io.flutter.app.FlutterActivity
+import io.flutter.plugins.GeneratedPluginRegistrant
+
+class EmbeddingV1Activity : FlutterActivity() {
+    override fun onCreate(savedInstanceState: Bundle) {
+        super.onCreate(savedInstanceState)
+        GeneratedPluginRegistrant.registerWith(this)
+    }    
+}

example/android/app/src/main/kotlin/com/apptreesoftware/barcodescanexample/MainActivity.kt

@@ -1,13 +1,12 @@
 package com.apptreesoftware.barcodescanexample
 
-import android.os.Bundle
+import com.apptreesoftware.barcodescan.BarcodeScanPlugin
+import io.flutter.embedding.android.FlutterActivity
+import io.flutter.embedding.engine.FlutterEngine
 
-import io.flutter.app.FlutterActivity
-import io.flutter.plugins.GeneratedPluginRegistrant
 
-class MainActivity(): FlutterActivity() {
-  override fun onCreate(savedInstanceState: Bundle?) {
-    super.onCreate(savedInstanceState)
-    GeneratedPluginRegistrant.registerWith(this)
+class MainActivity: FlutterActivity() {
+  override fun configureFlutterEngine(flutterEngine: FlutterEngine) {
+    flutterEngine.plugins.add(BarcodeScanPlugin())
   }
 }