Flutter：可以通过 MethodChannel 将数据从 Android 模块发送到 Flutter 项目，而无需关闭 Activity(仍在 Android Activity)中？

Question

我有屏幕。

1. StoryScreen(来自Flutter(
2. MainActivity(从Android Activity扩展到FlutterActivity(
3. MainUnityActivity(从Android活动，扩展到AppCompatActivity(

实际屏幕只有两个，StoryScreen和MainUnityActivity。MainActivity仅适用于主机。

在MainActivity中，我们定义了intent和method channel。

class MainActivity : FlutterActivity() {
private val tag = "MAIN"
private val channel = "NATIVE_EXPERIMENT"
override fun configureFlutterEngine(flutterEngine: FlutterEngine) {
GeneratedPluginRegistrant.registerWith(flutterEngine)
MethodChannel(flutterEngine.dartExecutor, channel).setMethodCallHandler { call, result ->
if (call.method.equals("goToUnityActivity")) {
val arg = call.arguments as Map<String, Any>
val gameType = arg.getValue("gameType") as String
val catalogURL = arg.getValue("catalogURL") as String
goToUnityActivity(gameType, catalogURL)
result.success(null)
} else {
result.notImplemented()
}
}
}
private fun goToUnityActivity(gameType: String, catalogURL: String) {
val intent = Intent(this, MainUnityActivity::class.java)
intent.putExtra("gameType", gameType)
intent.putExtra("catalogURL", catalogURL)
startActivityForResult(intent, MainUnityActivity.REQUEST_CODE_FROM_UNITY)
}
private fun notifyFlutterBackFromUnity(data: String?) {
MethodChannel(flutterEngine?.dartExecutor, channel).invokeMethod("backFromUnity", data)
}
override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
if (requestCode == MainUnityActivity.REQUEST_CODE_FROM_UNITY) {
if (resultCode == MainUnityActivity.RESULT_CODE_BACK_FROM_UNITY) {
val listOfReport = data!!.getStringExtra("listOfReport")
Log.i(tag, "/// [MainActivity] back from unity --> $listOfReport")
notifyFlutterBackFromUnity(listOfReport)
}
}
}
}

如果我退出MainUnityActivity，我可以将数据从Android发送到Flutter端，但如果我们仍在MainUnityActivity中，但想将数据从安卓发送到Fluter端，该怎么办？

class MainUnityActivity : UnityPlayerActivity() {
private val tag = "MIDDLEWARE_UNITY"
private val listOfVehicleNames: MutableList<String> = mutableListOf()
companion object {
const val RESULT_CODE_BACK_FROM_UNITY = 110
const val REQUEST_CODE_FROM_UNITY = 1
}
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
listOfVehicleNames.clear()
}
private fun backFromUnity() {
Log.i(tag, "/// [MainUnityActivity] BackButtonClick")
val resultIntent = Intent().apply {
putExtra("listOfReport", listOfVehicleNames.toString())
}
setResult(RESULT_CODE_BACK_FROM_UNITY, resultIntent)
finish()
}
override fun BackButtonClick() {
Log.i(tag, "/// [MainUnityActivity] BackButtonClick")
backFromUnity()
}
override fun ReportButtonClick() {
Log.i(tag, "/// [MainUnityActivity] ReportButtonClick")
showDialog()
}
private fun notifyFlutterReportFromUnity() {
val json = """{"title": "JSON Title", "notes": "JSON Notes"}"""
Log.i(tag, "/// [MainUnityActivity] YesReportClick :$json")
listOfVehicleNames.add(json)
// TODO: I want send data to Flutter without close this activity
}
private fun showDialog() {
val builder = AlertDialog.Builder(this)
builder.setTitle("Report")
builder.setMessage("Is there something wrong ?")
builder.setPositiveButton(
"Yes"
) { _, _ ->
Toast.makeText(this, "Okay, we're sorry", Toast.LENGTH_SHORT).show()
notifyFlutterReportFromUnity()
}
builder.setNegativeButton(
"No"
) { _, _ ->
// User click no
}
builder.setNeutralButton("Cancel") { _, _ ->
// User cancelled the dialog
}
builder.show()
}
}

Answer 1

最后，我使用MethodChannel、EventChannel和BroadcastReceiver修复了它。

方法通道：一个使用异步方法调用与平台插件通信的命名通道。

事件通道：用于使用事件流与平台插件通信的命名通道。

示例项目如下：https://github.com/rrifafauzikomara/example_flutter_method_channel