23.flutter-Android原生外嵌Plugins

主入口文件

package com.example.flutter_plus

import android.os.Bundle
import io.flutter.embedding.android.FlutterActivity
import io.flutter.embedding.engine.FlutterEngine

//主入口
class MainActivity: FlutterActivity() {
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        //引用
        CustomGeneratedPluginRegistrant.registerWith(FlutterEngine(this))
    }
}

注册文件

package com.example.flutter_plus

import androidx.annotation.Keep

import io.flutter.Log
import io.flutter.embedding.engine.FlutterEngine

@Keep
object CustomGeneratedPluginRegistrant {
    private const val tag = "CustomGeneratedPluginRegistrant"
    fun registerWith(flutterEngine: FlutterEngine) {
        try {
            flutterEngine.plugins.add(ImesBasePlugins())
        } catch (e: Exception) {
            Log.e(tag, "Error registering plugin wall_e_app.plugin, com.example.wall_e_app.plugin.ImesBasePlugins", e)
        }
    }
}

实现文件

package com.example.flutter_plus

import android.content.Context
import android.widget.Toast
import androidx.annotation.NonNull
import io.flutter.embedding.engine.plugins.FlutterPlugin
import io.flutter.plugin.common.BinaryMessenger
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

///基础库插件
class ImesBasePlugins : MethodCallHandler, FlutterPlugin {
    ///属性 - 0.1
    private lateinit var methodChannel: MethodChannel
    private lateinit var applicationContext: Context

    ///新入口 - 开始 0.2
    override fun onAttachedToEngine(@NonNull flutterPluginBinding: FlutterPlugin.FlutterPluginBinding) {
        setup(flutterPluginBinding.binaryMessenger, flutterPluginBinding.applicationContext)
    }

    ///设置 0.3
    private fun setup(messenger: BinaryMessenger, context: Context) {
        applicationContext = context
        methodChannel = MethodChannel(messenger, "imes_base_plugins_wall_e_outer_network")
        methodChannel.setMethodCallHandler(this)
    }

    ///出口 - 结束 0.5
    override fun onDetachedFromEngine(@NonNull binding: FlutterPlugin.FlutterPluginBinding) {
        methodChannel.setMethodCallHandler(null)
    }

    ///flutter->Android 0.4
    override fun onMethodCall(@NonNull methodCall: MethodCall, @NonNull result: Result) {

        when (methodCall.method) {
            "showToast" -> {
                Toast.makeText(applicationContext, methodCall.argument("data") ?: "", Toast.LENGTH_SHORT).show()
            }
        }
    }

}