android - 将文件发送到 WiFi 打印机

Question

我正在开发一个应用程序，在该应用程序中，我通过 IP 地址和端口号从我的手机向 WiFi 打印机发送文件，这些文件是 .txt、.png、.jpg、.doc。它们应该从打印机打印出来。我尝试了以下代码，但它只为我提供了 .txt 文件的输出。需要进行哪些更改才能获得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

我知道这是一个有点老的问题。 Android 4.4 为您提供了此功能。

Please check these instructions