Android-SignalR使用

前言

SignalR的版本问题

服务端的版本和客户端的版本一定要匹配

添加依赖

implementation 'com.microsoft.signalr:signalr:5.0.9'
//下面这个是日志输出，上面这个库用到了这个
implementation group: 'org.slf4j', name: 'slf4j-android', version: '1.7.32'

创建布局

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <ListView
        android:id="@+id/listview"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        app:layout_constraintBottom_toTopOf="@+id/send" />

    <androidx.appcompat.widget.AppCompatEditText
        android:id="@+id/edit_text"
        android:layout_width="0dp"
        android:layout_height="0dp"
        app:layout_constraintBottom_toBottomOf="@id/send"
        app:layout_constraintEnd_toStartOf="@id/send"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="@id/send" />

    <androidx.appcompat.widget.AppCompatButton
        android:id="@+id/send"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:padding="20dp"
        android:text="Send"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintRight_toRightOf="parent" />

</androidx.constraintlayout.widget.ConstraintLayout>

创建活动

class MainActivity : AppCompatActivity() {
    private val coroutineScope = CoroutineScope(Dispatchers.Default)

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        val hubConnection = HubConnectionBuilder.create("http://192.168.1.10:8020/chathub")
            .withTransport(TransportEnum.LONG_POLLING).build()
        val listview = findViewById<ListView>(R.id.listview)
        val editText = findViewById<AppCompatEditText>(R.id.edit_text)
        val messageList: List<String> = ArrayList()
        val arrayAdapter = ArrayAdapter(
            this@MainActivity,
            android.R.layout.simple_list_item_1, messageList
        )
        listview.adapter = arrayAdapter

        hubConnection.on("ReceiveMessage", { user: String?, message: String? ->
            runOnUiThread {
                arrayAdapter.add("ReceiveMessage:${user}--${message}")
                arrayAdapter.notifyDataSetChanged()
            }
        }, String::class.java, String::class.java)

        findViewById<AppCompatButton>(R.id.send).setOnClickListener {
            val message = editText.text.toString()
            if (message.isEmpty()) {
                return@setOnClickListener
            }
            editText.setText("")
            try {
                hubConnection.send("SendMessage", "Android--", message)
                arrayAdapter.add("SendMessage:${message}")
                arrayAdapter.notifyDataSetChanged()
            } catch (e: Exception) {
                e.printStackTrace()
            }
        }
        coroutineScope.launch {
            connect(hubConnection, arrayAdapter)
        }
    }

    override fun onDestroy() {
        super.onDestroy()
        coroutineScope.cancel()
    }

    private suspend fun connect(hubConnection: HubConnection, arrayAdapter: ArrayAdapter<String>) {
        try {
            withContext(Dispatchers.Default) {
                hubConnection.start().blockingAwait()
                arrayAdapter.add(
                    "connectionState:${hubConnection.connectionState}" +
                            "\nconnectionId:${hubConnection.connectionId}" +
                            "\nkeepAliveInterval:${hubConnection.keepAliveInterval}" +
                            "\nserverTimeout:${hubConnection.serverTimeout}"
                )
                arrayAdapter.notifyDataSetChanged()
            }
        } catch (e: Exception) {
            e.printStackTrace()
        }
    }
}

混淆

# SignalR
-keep class com.microsoft.**{*;}