Android套接字運行在薑餅，但不是在果凍豆

Question

從此代碼我可以傳輸文件與我的電腦在Android 2.3.3。（戴爾Streak），但當我運行相同的代碼在Android 4.2（三星GS 3）沒有。我認爲問題是Socket何時初始化？我必須做的是在4.2中工作嗎？

package com.hrandika.synchronizer.serverClient; 

import java.io.BufferedInputStream; 
import java.io.BufferedReader; 
import java.io.File; 
import java.io.FileInputStream; 
import java.io.InputStream; 
import java.io.InputStreamReader; 
import java.io.OutputStream; 
import java.io.OutputStreamWriter; 
import java.net.Socket; 

import android.os.AsyncTask; 
import android.util.Log; 

public class Client { 

File sendingFile; 

public Client(File sendingFile) { 
    Log.d("Client", "Cleint : Constructed"); 
    this.sendingFile = sendingFile; 
} 

public void send(String ip) { 
    try { 
     Log.d("Client", "Cleint stating ...."); 
     Socket socket = new Socket(ip, 5555); 
     Log.d("Client", "Cleint Socket Okay"); 

     OutputStream outputStream = socket.getOutputStream(); 
     OutputStreamWriter outputStreamWriter = new OutputStreamWriter(
       outputStream); 

     Log.d("Client", "Cleint ready to sent"); 
     outputStreamWriter.write(sendingFile.getName() + "\n"); 
     outputStreamWriter.flush(); 
     Log.d("Client", "Cleint Sent"); 

     InputStream inputStream = socket.getInputStream(); 
     InputStreamReader inputStreamReader = new InputStreamReader(
       inputStream); 

     BufferedReader bufferedReader = new BufferedReader(
       inputStreamReader); 

     String serverResponse = bufferedReader.readLine(); 

     if (serverResponse.equals("READY")) { 
      Log.d("Client", "Cleint : server ready"); 

      byte[] buffer = new byte[(int) sendingFile.length()]; 
      FileInputStream fileInputStream = new FileInputStream(
        sendingFile); 
      BufferedInputStream bufferedInputStream = new BufferedInputStream(
        fileInputStream); 
      bufferedInputStream.read(buffer, 0, buffer.length); 
      outputStream.write(buffer, 0, buffer.length); 

      outputStream.flush(); 
      bufferedInputStream.close(); 
      fileInputStream.close(); 
      socket.close(); 

     } 

    } catch (Exception e) { 
    } 
} 



public class Sender extends AsyncTask<String, String, String>{ 

    @Override 
    protected String doInBackground(String... params) { 
     send("192.168.43.21"); 
     return null; 
    } 

} 
} // End class Client 

Answer 1

您不能在UI線程上執行任何網絡連接，並且這是由以Honeycomb開頭的平臺實施的。我想你沒有正確使用AsyncTask。

強制性閱讀：

• Keeping Your App Responsive
• Why Ice Cream Sandwich Crashes Your App

更新：作爲網絡的錯誤，開始adb shell（我假設設備通過USB連接到PC）和類型telnet 192.168.43.21 5555 - 通過這種方式，您將能夠檢查您的服務器是否可以從手機實際到達。

更新2：剛剛檢查，恐怕telnet二進制文件不存在於股票（不是固定的）設備上。但是任何可連接到給定IP /端口的應用程序都足以用於測試，例如，這telnet client。這樣，您甚至可以在觸摸自己的代碼之前就消除安裝問題。