通过Wlan路由器实现Android App与Raspberry Pi 3的通信

from flask import Flask, jsonify

app = Flask(__name__)

@app.route('/data', methods=['GET'])
def get_data():
    return jsonify({"temperature": 25, "humidity": 60})

if __name__ == '__main__':
    app.run(host='0.0.0.0', port=5000)

import android.os.Bundle
import android.widget.TextView
import androidx.appcompat.app.AppCompatActivity
import java.net.HttpURLConnection
import java.net.URL

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

        val textView = findViewById<TextView>(R.id.textView)
        Thread {
            try {
                val url = URL("http://<Raspberry Pi IP>:5000/data")
                with(url.openConnection() as HttpURLConnection) {
                    requestMethod = "GET"
                    inputStream.bufferedReader().use {
                        val result = it.readText()
                        runOnUiThread {
                            textView.text = result
                        }
                    }
                }
            } catch (e: Exception) {
                e.printStackTrace()
            }
        }.start()
    }
}