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Code Issues Releases Wiki Activity

[platform_channels] adds BasicMessageChannel Demo (#484)

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This commit is contained in:
Ayush Bherwani
2020-07-11 05:41:52 +05:30
committed by GitHub
parent 9140559040
commit 03008a5d19
8 changed files with 426 additions and 5 deletions
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1
platform_channels/android/app/build.gradle
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@@ -60,4 +60,5 @@ flutter {
dependencies {
implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
implementation 'com.google.code.gson:gson:2.8.6'
}

41
platform_channels/android/app/src/main/kotlin/dev/flutter/platform_channels/MainActivity.kt
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@@ -7,13 +7,13 @@ package dev.flutter.platform_channels
import android.content.Context
import android.hardware.Sensor
import android.hardware.SensorManager
import com.google.gson.Gson
import com.google.gson.reflect.TypeToken
import io.flutter.embedding.android.FlutterActivity
import io.flutter.embedding.engine.FlutterEngine
import io.flutter.plugin.common.BasicMessageChannel
import io.flutter.plugin.common.EventChannel
import io.flutter.plugin.common.MethodChannel
import io.flutter.plugin.common.StandardMessageCodec
import io.flutter.plugin.common.*
import java.io.InputStream
import java.nio.ByteBuffer
class MainActivity : FlutterActivity() {
override fun configureFlutterEngine(flutterEngine: FlutterEngine) {
@@ -50,7 +50,38 @@ class MainActivity : FlutterActivity() {
.setMessageHandler { message, reply ->
if (message == "getImage") {
val inputStream: InputStream = assets.open("eat_new_orleans.jpg")
reply.reply(inputStream.readBytes());
reply.reply(inputStream.readBytes())
}
}
val petList = mutableListOf<Map<String, String>>()
val gson = Gson()
// A BasicMessageChannel for sending petList to Dart.
val stringCodecChannel = BasicMessageChannel(flutterEngine.dartExecutor, "stringCodecDemo", StringCodec.INSTANCE)
// Registers a MessageHandler for BasicMessageChannel to receive pet details to be
// added in petList and send the it back to Dart using stringCodecChannel.
BasicMessageChannel(flutterEngine.dartExecutor, "jsonMessageCodecDemo", JSONMessageCodec.INSTANCE)
.setMessageHandler { message, reply ->
petList.add(0, gson.fromJson(message.toString(), object : TypeToken<Map<String, String>>() {}.type))
stringCodecChannel.send(gson.toJson(mapOf("petList" to petList)))
}
// Registers a MessageHandler for BasicMessageChannel to receive the index of pet
// details to be removed from the petList and send the petList back to Dart using
// stringCodecChannel. If the index is not in the range of petList, we send null
// back to Dart.
BasicMessageChannel(flutterEngine.dartExecutor, "binaryCodecDemo", BinaryCodec.INSTANCE)
.setMessageHandler { message, reply ->
val index = String(message!!.array()).toInt()
if (index >= 0 && index < petList.size) {
petList.removeAt(index)
val replyMessage = "Removed Successfully"
reply.reply(ByteBuffer.allocateDirect(replyMessage.toByteArray().size).put(replyMessage.toByteArray()))
stringCodecChannel.send(gson.toJson(mapOf("petList" to petList)))
} else {
reply.reply(null)
}
}
}