Android套接字运行在姜饼，但不是在果冻豆

Question

从此代码我可以传输文件与我的电脑在Android 2.3.3。（戴尔Streak），但当我运行相同的代码在Android 4.2（三星GS 3）没有。我认为问题是Socket何时初始化？我必须做的是在4.2中工作吗？

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线程上执行任何网络连接，并且这是由以Honeycomb开头的平台实施的。我想你没有正确使用AsyncTask。

强制性阅读：

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

更新：作为网络的错误，开始adb shell（我假设设备通过USB连接到PC）和类型telnet 192.168.43.21 5555 - 通过这种方式，您将能够检查您的服务器是否可以从手机实际到达。

更新2：刚刚检查，恐怕telnet二进制文件不存在于股票（不是固定的）设备上。但是任何可连接到给定IP /端口的应用程序都足以用于测试，例如，这telnet client。这样，您甚至可以在触摸自己的代码之前就消除安装问题。