我想创建在许多 Activity 中将数据发送到服务器的TCP_Client。我决定使用依赖注入(inject)将所有配置相同的客户端注入(inject)所有客户端。不幸的是,它在启动时停止工作。

我的应用程序模块

val appModule = module {
    single<ConnectionService> { ConnectionServiceTcp("192.168.0.1", 8888) }
}

主要用途
class MainApplication : Application() {

    override fun onCreate() {
        super.onCreate()
        startKoin {
            androidContext(this@MainApplication)
            androidLogger()
            modules(appModule)
        }
    }
}
class ConnectionServiceTcp(private val ipAddress: String, private val port : Int)
    : IntentService("TCP_CLIENT"), ConnectionService {

    private var client : Socket? = null

    override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
        super.onStartCommand(intent, flags, startId)
        return START_STICKY
    }

    override fun onHandleIntent(intent: Intent?) {
        startTcpServer()
    }

    private fun startTcpServer() {
        client = Socket(ipAddress, port)
    }


    override fun isConnectedToServer(): Boolean {
        Log.println(Log.INFO, null, "Adres = ${client?.localAddress} port = ${client?.localPort}")
        return false
    }

}
class MainActivity : AppCompatActivity() {

    private val connectionService : ConnectionService by inject()

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

    private fun startTcpServer() {
        val serverTcp = Intent(this, ConnectionServiceTcp::class.java)
        startService(serverTcp)
    }



然后我收到
    java.lang.RuntimeException: Unable to instantiate service connection.impl.ConnectionServiceTcp: java.lang.InstantiationException: java.lang.Class<connection.impl.ConnectionServiceTcp> has no zero argument constructor

我找不到一种方法来注入(inject)后台客户端以发送TCP请求

最佳答案

与Activity,Fragments或其他平台组件一样,Android系统暗示Services应该具有单个no-arg构造函数。系统在Service类中查找默认构造函数,并使用反射对其进行调用。这就是为什么禁止添加非默认构造函数(即带有参数的构造函数)的原因。

要将依赖项注入(inject)Service中,您应该像在“ Activity ”中一样进行操作(声明一个字段,并使用inject()委托(delegate)注入(inject)它。因此,最终代码如下所示:

class ConnectionServiceTcp()
    : IntentService("TCP_CLIENT"), ConnectionService {

    private val ipAddress: String by inject()
    private val port : Int by inject()
    private var client : Socket? = null

    override fun onStartCommand(intent: Intent?, flags: Int, startId: Int): Int {
        super.onStartCommand(intent, flags, startId)
        return START_STICKY
    }

    override fun onHandleIntent(intent: Intent?) {
        startTcpServer()
    }

    private fun startTcpServer() {
        client = Socket(ipAddress, port)
    }

    override fun isConnectedToServer(): Boolean {
        Log.println(Log.INFO, null, "Adres = ${client?.localAddress} port = ${client?.localPort}")
        return false
    }
}

07-24 09:49
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