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POAndroid - Send an image through socket programming
 

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  1. POAndroid - Send an image through socket programming
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    <p>I am implementing a socket application where one phone will be a client and the other will be a server. The program is able to send strings using print writer just fine from the client to the sever but when i try to send an image file, it throws an exception. I'd really appreciate if someone could help me out.</p> <p>Here is the code for the server</p> <pre><code>public class ServerActivity extends Activity { private TextView serverStatus; private ImageView profile; // DEFAULT IP public static String SERVERIP = "10.0.2.15"; // DESIGNATE A PORT public static final int SERVERPORT = 8080; private Handler handler = new Handler(); private ServerSocket serverSocket; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.server); serverStatus = (TextView) findViewById(R.id.server_status); profile = (ImageView) findViewById(R.id.image); String filepath = "/sdcard/DCIM/time table.png"; File imagefile = new File(filepath); FileInputStream fis = null; try { fis = new FileInputStream(imagefile); } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } Bitmap bm = BitmapFactory.decodeStream(fis); profile.setImageBitmap(bm); SERVERIP = getLocalIpAddress(); Thread fst = new Thread(new ServerThread()); fst.start(); } public class ServerThread implements Runnable { //String line; byte [] line; Bitmap bitmap; public void run() { try { if (SERVERIP != null) { handler.post(new Runnable() { @Override public void run() { serverStatus.setText("Listening on IP: " + SERVERIP); } }); serverSocket = new ServerSocket(SERVERPORT); while (true) { // LISTEN FOR INCOMING CLIENTS Socket client = serverSocket.accept(); handler.post(new Runnable() { @Override public void run() { serverStatus.setText("Connected."); } }); try { /*InputStream in = client.getInputStream(); line = null; in.read(line); Log.d("ServerActivity", line.toString()); bitmap = BitmapFactory.decodeByteArray(line , 0, line.length);*/ int bytesRead; int current = 0; int filesize=65383; byte [] mybytearray2 = new byte [filesize]; InputStream is = client.getInputStream(); FileOutputStream fos = new FileOutputStream("/storage/sdcard0/Pictures/Screenshots/IMG-20130112-WA0011.jpeg"); // destination path and name of file //FileOutputStream fos = new FileOutputStream("/storage/sdcard0/Pictures/Screenshots/"); BufferedOutputStream bos = new BufferedOutputStream(fos); bytesRead = is.read(mybytearray2,0,mybytearray2.length); current = bytesRead; do { bytesRead = is.read(mybytearray2, current, (mybytearray2.length-current)); if(bytesRead &gt;= 0) current += bytesRead; } while(bytesRead &gt; -1); bos.write(mybytearray2, 0 , current); bos.flush(); long end = System.currentTimeMillis(); //System.out.println(end-start); bos.close(); handler.post(new Runnable() { @Override public void run() { profile.setImageBitmap(bitmap); //serverStatus.setText(line); } }); /*BufferedReader in = new BufferedReader(new InputStreamReader(client.getInputStream())); line = null; while ((line = in.readLine()) != null) { Log.d("ServerActivity", line); handler.post(new Runnable() { @Override public void run() { serverStatus.setText(line); // DO WHATEVER YOU WANT TO THE FRONT END // THIS IS WHERE YOU CAN BE CREATIVE } }); }*/ break; } catch (Exception e) { handler.post(new Runnable() { @Override public void run() { serverStatus.setText("Oops. Connection interrupted. Please reconnect your phones."); } }); e.printStackTrace(); } } } else { handler.post(new Runnable() { @Override public void run() { serverStatus.setText("Couldn't detect internet connection."); } }); } } catch (Exception e) { handler.post(new Runnable() { @Override public void run() { serverStatus.setText("Error"); } }); e.printStackTrace(); } } } // GETS THE IP ADDRESS OF YOUR PHONE'S NETWORK private String getLocalIpAddress() { try { for (Enumeration&lt;NetworkInterface&gt; en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements();) { NetworkInterface intf = en.nextElement(); for (Enumeration&lt;InetAddress&gt; enumIpAddr = intf.getInetAddresses(); enumIpAddr.hasMoreElements();) { InetAddress inetAddress = enumIpAddr.nextElement(); if (!inetAddress.isLoopbackAddress()) { return inetAddress.getHostAddress().toString(); } } } } catch (SocketException ex) { Log.e("ServerActivity", ex.toString()); } return null; } @Override protected void onStop() { super.onStop(); try { // MAKE SURE YOU CLOSE THE SOCKET UPON EXITING serverSocket.close(); } catch (IOException e) { e.printStackTrace(); } } </code></pre> <p>}</p> <p>And this is the client side code</p> <pre><code>public class ClientActivity extends Activity { private EditText serverIp; private Button connectPhones; private String serverIpAddress = ""; private boolean connected = false; private Handler handler = new Handler(); private Socket socket; private ImageView profile; private byte [] imgbyte; String filepath; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.client); serverIp = (EditText) findViewById(R.id.server_ip); connectPhones = (Button) findViewById(R.id.connect_phones); connectPhones.setOnClickListener(connectListener); profile = (ImageView) findViewById(R.id.imageView1); filepath = "/sdcard/small.jpg"; File imagefile = new File(filepath); FileInputStream fis = null; try { fis = new FileInputStream(imagefile); } catch (FileNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } Bitmap bm = BitmapFactory.decodeStream(fis); imgbyte = getBytesFromBitmap(bm); profile.setImageBitmap(bm); } private OnClickListener connectListener = new OnClickListener() { @Override public void onClick(View v) { if (!connected) { serverIpAddress = serverIp.getText().toString(); if (!serverIpAddress.equals("")) { Thread cThread = new Thread(new ClientThread()); cThread.start(); } } } }; public class ClientThread implements Runnable { public void run() { try { InetAddress serverAddr = InetAddress.getByName(serverIpAddress); Log.d("ClientActivity", "C: Connecting..."); socket = new Socket(serverAddr, ServerActivity.SERVERPORT); connected = true; while (connected) { try { /*File myFile = new File (filepath); byte [] mybytearray = new byte [(int)myFile.length()]; FileInputStream fis = new FileInputStream(myFile); BufferedInputStream bis = new BufferedInputStream(fis); bis.read(mybytearray,0,mybytearray.length); OutputStream os = socket.getOutputStream(); Log.d("ClientActivity", "C: Sending command."); //System.out.println("Sending..."); os.write(mybytearray,0,mybytearray.length); os.flush();*/ Log.d("ClientActivity", "C: Sending command."); /*PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket .getOutputStream())), true);*/ // WHERE YOU ISSUE THE COMMANDS OutputStream output = socket.getOutputStream(); Log.d("ClientActivity", "C: image writing."); output.write(imgbyte); output.flush(); // out.println("Hey Server!"); Log.d("ClientActivity", "C: Sent."); } catch (Exception e) { Log.e("ClientActivity", "S: Error", e); } } socket.close(); Log.d("ClientActivity", "C: Closed."); } catch (Exception e) { Log.e("ClientActivity", "C: Error", e); connected = false; } } } protected void onStop() { super.onStop(); try { // MAKE SURE YOU CLOSE THE SOCKET UPON EXITING socket.close(); connected = false; } catch (IOException e) { e.printStackTrace(); } } public byte[] getBytesFromBitmap(Bitmap bitmap) { ByteArrayOutputStream stream = new ByteArrayOutputStream(); bitmap.compress(CompressFormat.JPEG, 70, stream); return stream.toByteArray(); } </code></pre> <p>}</p> <p>update: The exception is thrown at the server side code. Its the exception which reads :"Oops. Connection interrupted. Please reconnect your phones." This is the exception that is thrown: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()</p>
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