アンドロイドで一貫したWIFI接続を作る方法

Question

私の新しいアンドロイドアプリでは、特定のIPとポートを持つデバイスに直接TCP接続を行いました。ここでの問題は、Wifiの接続を解除しても、再接続やデータの再送信が行われない場合です。

私のコードの中には、以下のクラスClient.javaとMainActivity.javaがあります。

どうすればいいですか？

##################################################### 

public class Client extends AsyncTask<String, Void, Void> { 

    String dstAddress; 
    int dstPort; 
    String response = ""; 
    TextView textResponse; 

    Socket socket = null; Socket smtpSocket = null; 
    DataOutputStream os = null; 
    DataInputStream is = null; 



    Client(String addr, int port, TextView textResponse) { 
     dstAddress = addr; 
     dstPort = port; 
     this.textResponse = textResponse; 
    } 

    @Override 
    protected Void doInBackground(String... params) { 




     String str = params[0]; 


     try { 

      smtpSocket = new Socket(dstAddress, dstPort); 
      os = new DataOutputStream(smtpSocket.getOutputStream()); 
      is = new DataInputStream(smtpSocket.getInputStream()); 


      ByteArrayOutputStream byteArrayOutputStream = new ByteArrayOutputStream(
        1024); 
      byte[] buffer = new byte[1024]; 

      int bytesRead; 
      InputStream inputStream = smtpSocket.getInputStream(); 

      //smtpSocket. 


      /* notice: inputStream.read() will block if no data return */ 

      while ((bytesRead = inputStream.read(buffer)) != -1) { 
       byteArrayOutputStream.write(buffer, 0, bytesRead); 
       response += byteArrayOutputStream.toString("UTF-8"); 
      } 

      //textResponse.setText(response); 


     } catch (UnknownHostException e) { 
      System.err.println("Don't know about host: hostname"); 
     } catch (IOException e) { 
      System.err.println("Couldn't get I/O for the connection to: hostname"); 

     } 

     if (smtpSocket != null && os != null) { 
       try { 

        os.writeBytes(str); 

        String responseLine; 
        while ((responseLine = is.readLine()) != null) { 
         System.out.println("Server: " + responseLine); 

         if (responseLine.indexOf("Ok") != -1) { 
          break; 
         } 
        } 
        //os.close(); 
        //is.close(); 
        //smtpSocket.close(); 
       } catch (UnknownHostException e) { 
        System.err.println("Trying to connect to unknown host: " + e); 
       } catch (IOException e) { 
        System.err.println("IO-Exception: " + e); 
       } 
     } 


     return null; 
    } 




    @Override 
    protected void onPostExecute(Void result) { 
     //textResponse.setText("dweewed"); 
     super.onPostExecute(result); 

     //super.cancel(true); 
    } 

    public void sendToPort(String str) throws IOException { 
     if (smtpSocket != null && os != null) { 
      try { 

       os.writeBytes(str); 

       // os.close(); 
       // is.close(); 
       // smtpSocket.close(); 
      } catch (UnknownHostException e) { 
       System.err.println("Trying to connect to unknown host: " + e); 
      } catch (IOException e) { 
       System.err.println("IOException: " + e); 
      } 
     } 




    } 



} 
############################################################# 
MainActivity.java 


public class MainActivity extends AppCompatActivity { 

    Button buttonConnect, buttonClear; 
    TextView response; 

    Client myClient; 

    String editTextAddress = "10.0.1.50"; 
    Integer editTextPort = 48; 

    boolean keepalive = true; 

    ConnectivityManager connManager; 





    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 

     myClient = new Client(editTextAddress, editTextPort, response); 


     connManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE); 

     buttonConnect = (Button) findViewById(R.id.btnconnect); 
     buttonClear = (Button) findViewById(R.id.clear); 
     response = (TextView) findViewById(R.id.feedback); 






     buttonConnect.setOnClickListener(new OnClickListener() { 

      @Override 
      public void onClick(View arg0) { 

        response.setText(""); 

        String dat = "Open"; 

        try { 
         //String dat = "sec rfdgdf"; 
         dat = dat + "\r\n"; 

         myClient.sendToPort(dat); 


        } catch (UnknownHostException e) { 
         System.err.println("Trying to connect to unknown host: " + e); 
         response.setText("Trying to connect to unknown host: " + e); 
        } catch (IOException e) { 
         System.err.println("IOException: " + e); 

        } 


      } 
     }); 





    } 



    @Override 
    public void onResume(){ 
     super.onResume(); 

     response.setText("Resum`enter code here`e connected!"); 



    } 
} 

Answer 1

は、あなたが提供されているコードはconnManager