发送文件到WiFi打印机

Question

我正在开发一个应用程序，其中从我的手机我通过IP地址和端口号发送文件到WiFi打印机，这是。txt， .png， .jpg， .doc。应该从打印机上打印出来。我试过下面的代码，但它只给我输出。txt文件。需要做哪些更改才能得到所有类型文件的输出?请帮助…

    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"/>

Answer 1

我知道这是个有点老的问题。Android 4.4为您提供此功能。

请检查这些说明

Answer 2

Jpg、png和doc需要被解析成打印机可以识别的文件格式，如pdf或PS，然后文件才能流式传输到打印机。