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（即 .txt、.png、.jpg、.doc）将文件从我的手机发送到 WiFi 打印机。它们应该从打印机打印出来。我尝试过以下代码，但它只为我提供 .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？？？请帮忙...
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"/>
我知道这是一个有点老的问题。 Android 4.4 为您提供了此功能。
请检查这些说明 http://developer.android.com/training/printing/index.html
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