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python - 将 Android 应用程序连接到 Python 服务器

问题描述

我正在编写一个程序，将一个字符串对象（最终是图像，但从小开始）从 Android 应用程序发送到 python 服务器。

我的 python 服务器现在非常小，它只是监听然后打印它接收到的内容。

import socket
import sys
print("---------------------------------------------")
socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server_addy = ("localhost", 5589)
print("starting up on %s with port %s" % server_addy)
socket.bind(server_addy)
socket.listen(1)
while True:
    print("Waiting on connection...")
    print("---------------------------------------------")
    connection, client_addy = socket.accept()
    print("Connection Accepted")
try:
    print("Connection received from...", client_addy)
    while True:
        data = connection.recv(1024)
        print("Received \" %s \" from connection" % data)
        connection.close()
        break
finally:
    print("Closing Connection to ", client_addy)
    connection.close()

我已经用另一个能够连接到该服务器并从该服务器发送/接收数据的 python 客户端对此进行了测试。所以在我的 Android 应用程序方面，我有

public class score_verify extends AppCompatActivity {

private String input_score;
private Pattern pattern = Pattern.compile("[0-9]+");
private Socket socket;
private String url = "localhost";
private String metadata;
private int port = 5589;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_score_verify);
    Button submit = (Button) findViewById(R.id.submit);
    final EditText score = (EditText) findViewById(R.id.input);
    final CheckBox box = (CheckBox) findViewById(R.id.verify);
    metadata = getIntent().getStringExtra("metadata");
    submit.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View view) {
            input_score = score.getText().toString();
            if(!pattern.matcher(input_score).matches()) {
                Toast.makeText(score_verify.this, "Please Enter A Valid Score", Toast.LENGTH_LONG).show();
            }
            else if(!box.isChecked()) {
                Toast.makeText(score_verify.this, "Please Verify that the Information is Correct", Toast.LENGTH_LONG).show();
            }
            else {
                try {
                    metadata += ("," + input_score);
                    metadataTask task = new metadataTask();
                    task.execute();
                } catch (Exception e) {
                    e.printStackTrace();
                }
            }
        }
    });
}

实际的连接代码是

private class metadataTask extends AsyncTask<Void, Void, Void> {
    PrintWriter printWriter;
    @Override
    protected Void doInBackground(Void...params) {
        try {
            socket = new Socket(url, 5589);
            printWriter = new PrintWriter(socket.getOutputStream());
            printWriter.write("Connecting!...");
            printWriter.flush();
            printWriter.close();
            socket.close();
        } catch (UnknownHostException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
        return null;
    }
}

}

对于我有 URL 的第一部分，我用“127.0.0.1”、“localhost”和“10.0.2.2”尝试过它，我得到连接超时或（使用 localhost）连接被拒绝错误。

我有

  <uses-permission android:name="android.permission.INTERNET"/>
  <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />

在我的清单中以及任何帮助将不胜感激，我的诊断这个问题的能力即将结束

平结果：

Pinging 192.168.1.89 with 32 bytes of data:
Reply from 192.168.1.232: Destination host unreachable.
Reply from 192.168.1.89: bytes=32 time=49ms TTL=64
Reply from 192.168.1.89: bytes=32 time=130ms TTL=64
Reply from 192.168.1.89: bytes=32 time=37ms TTL=64

Ping statistics for 192.168.1.89:
    Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
    Minimum = 37ms, Maximum = 130ms, Average = 72ms

标签： pythonandroidnetworking

解决方案

您的 python 代码似乎在 while 循环中永远持续地接受连接，这会阻止它进入 try 块。还将地址参数更改server_addy为 server_addy = ('', "port") 为您提供以下代码

import socket
import sys
print("---------------------------------------------")
socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server_addy = ('', 5600)
print("starting up on %s with port %s" % server_addy)
socket.bind(server_addy)
socket.listen(1)
while True:
    print("Waiting on connection...")
    print("---------------------------------------------")
    connection, client_addy = socket.accept()
    print("Connection Accepted")
    try:
       print("Connection received from...", client_addy)
       while True:
                 data = connection.recv(1024)
                 print("Received \" %s \" from connection" % data)
                 connection.close()
                 break
    finally:
           print("Closing Connection to ", client_addy)
           connection.close()

这将一次提供单个客户端连接，并且在关闭连接时它将接受下一个连接。在 android 部分使用两个地址中的任何一个进行连接：

  • 您的私有 IP 地址 (192.168.0.0)
  • 或者，10.0.2.2

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