我正在开发中，从我的手机，我将文件发送到打印机的WiFi通过IP地址和端口号，这是txt文件，巴纽，JPG格式，名为.doc的应用程序。它们应该从打印机打印图像。我曾尝试以下code，但它给我的输出只有.txt文件。需要什么样的变化让所有类型的文件输出???请帮助...

 进口java.io.BufferedInputStream中;
    进口的java.io.File;
    进口java.io.FileInputStream中;
    进口java.io.IOException异常;
    进口java.io.OutputStream中;
    进口的java.net.Socket;
    进口的java.net.UnknownHostException;

    进口android.app.Activity;
    进口android.os.Bundle;
    进口android.view.View;
    进口android.widget.Button;
    进口android.widget.EditText;
    进口android.widget.TextView;

    公共类MainActivity延伸活动{

     私人客户端的Socket;
     私人的FileInputStream的FileInputStream;
     私人的BufferedInputStream的BufferedInputStream;
     私人的OutputStream的OutputStream;
     私人Button按钮;
     私人TextView的文字;
     私人的EditText ETIP，etPort;
     INT端口= 0;

     @覆盖
     公共无效的onCreate（包savedInstanceState）{
      super.onCreate（savedInstanceState）;
      的setContentView（R.layout.activity_main）;

      按钮=（按钮）findViewById（R.id.button1）; //参照发送按钮
      文=（TextView的）findViewById（R.id.textView1）; //参考文本视图
      ETIP =（EditText上）findViewById（R.id.editText1）;
      etPort =（EditText上）findViewById（R.id.editText2）;
      //按钮preSS事件监听器
      button.setOnClickListener（新View.OnClickListener（）{

       公共无效的onClick（视图v）{


         //创建文件实例
           端口=的Integer.parseInt（etPort.getText（）的toString（））;
           档案文件=新的文件（到/ mnt / SD卡/蓝牙/ AnyFile.txt）;
        尝试
        {

         客户端=新的Socket（etIp.getText（）的toString（），口）;

         byte []的mybytearray =新的字节[（INT）file.length（）]; //创建一个字节数组到文件

         的FileInputStream =新的FileInputStream（文件）;
         的BufferedInputStream =新的BufferedInputStream（的FileInputStream）;

         bufferedInputStream.read（mybytearray，0，mybytearray.length）; //读取文件

         的OutputStream = client.getOutputStream（）;

         outputStream.write（mybytearray，0，mybytearray.length）; //写文件以由字节输出流字节
         outputStream.flush（）;
         bufferedInputStream.close（）;
         outputStream.close（）;
         client.close（）;

         text.setText（文件已发送）;


        }赶上（UnknownHostException异常E）{
         e.printStackTrace（）;
        }赶上（IOException异常E）{
         e.printStackTrace（）;
        }


       }
      }）;

     }
    }



清单文件

＆LT;使用-权限的Andr​​oid：名称=android.permission.INTERNET对/＆GT;
＆LT;使用-权限的Andr​​oid：名称=android.permission.ACCESS_NETWORK_STATE/＆GT;
＆LT;使用-权限的Andr​​oid：名称=android.permission.ACCESS_WIFI_STATE/＆GT;
＆LT;使用-权限的Andr​​oid：名称=android.permission.CHANGE_WIFI_STATE/＆GT;
 

解决方案

我知道这是一个有点老问题 Android 4.4系统为您提供此功能

请检查这些说明

我希望这将帮助别人：）

I am developing an application in which from my mobile I am sending files to the WiFi printer by IP address and port number, which are .txt, .png, .jpg, .doc. They should be printed from the printer. I have tried following code but it is giving me output for .txt file only. What changes are required to get output of all type of files??? Please help...

    import java.io.BufferedInputStream;
    import java.io.File;
    import java.io.FileInputStream;
    import java.io.IOException;
    import java.io.OutputStream;
    import java.net.Socket;
    import java.net.UnknownHostException;

    import android.app.Activity;
    import android.os.Bundle;
    import android.view.View;
    import android.widget.Button;
    import android.widget.EditText;
    import android.widget.TextView;

    public class MainActivity extends Activity {

     private Socket client;
     private FileInputStream fileInputStream;
     private BufferedInputStream bufferedInputStream;
     private OutputStream outputStream;
     private Button button;
     private TextView text;
     private EditText etIp, etPort;
     int port=0;

     @Override
     public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);

      button = (Button) findViewById(R.id.button1);   //reference to the send button
      text = (TextView) findViewById(R.id.textView1);   //reference to the text view
      etIp = (EditText) findViewById(R.id.editText1);
      etPort = (EditText) findViewById(R.id.editText2);
      //Button press event listener
      button.setOnClickListener(new View.OnClickListener() {

       public void onClick(View v) {


         //create file instance
           port=Integer.parseInt(etPort.getText().toString());
           File file = new File("/mnt/sdcard/bluetooth/AnyFile.txt"); 
        try 
        {

         client = new Socket(etIp.getText().toString(), port);

         byte[] mybytearray = new byte[(int) file.length()]; //create a byte array to file

         fileInputStream = new FileInputStream(file);
         bufferedInputStream = new BufferedInputStream(fileInputStream);  

         bufferedInputStream.read(mybytearray, 0, mybytearray.length); //read the file

         outputStream = client.getOutputStream();

         outputStream.write(mybytearray, 0, mybytearray.length); //write file to the output stream byte by byte
         outputStream.flush();
         bufferedInputStream.close();
         outputStream.close();
         client.close();

         text.setText("File Sent");


        } catch (UnknownHostException e) {
         e.printStackTrace();
        } catch (IOException e) {
         e.printStackTrace();
        }


       }
      });

     }
    }



Manifest file

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

I know it is a bit old Question Android 4.4 provides you this functionality

Please check these instructions

I hope it will help someone :)