hi am new to programming. am starting a thread by using onClick(View v).it works fine. now i want to repeat the "button click" by without clicking the button again. Am searching for about 5 hours. but i didn't get any answer. i user button.performClick(); but nothing happened. i want to restart my thread.
Receiver:
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();
connectPhones = (Button) findViewById(R.id.connect_phones);
connectPhones.setPressed(false);
connectPhones.invalidate();
Handler handler1 = new Handler();
Runnable r1 = new Runnable() {
public void run() {
connectPhones.performClick();
connectPhones.setPressed(true);
connectPhones.invalidate();
connectPhones.setPressed(false);
connectPhones.invalidate();
}
};
handler1.postDelayed(r1, 1000);
}
}
}
};
public class ClientThread implements Runnable {
public void run() {
try {
InetAddress serverAddr = InetAddress.getByName(serverIpAddress);
Log.d("ClientActivity", "C: Connecting...");
Socket socket = new Socket(serverAddr, ServerActivity.SERVERPORT);
connected = true;
final String path = "/sdcard/all.png";
File file = new File(path);
ObjectInputStream reader = new ObjectInputStream(socket.getInputStream());
int nRead = 0;
byte[] data = new byte[socket.getReceiveBufferSize()];
FileOutputStream fileOutputStream = new FileOutputStream( path );
// while(connected == true){
while( (nRead = reader.read(data)) != -1 ){
fileOutputStream.write( data, 0, nRead );
fileOutputStream.flush();
data = new byte[socket.getReceiveBufferSize()];
}
fileOutputStream.close();
//}
handler.post(new Runnable() {
#Override
public void run() {
Bitmap bitmap = BitmapFactory.decodeFile(path);
image.setImageBitmap(bitmap);
image.postInvalidate();
}
});
file.delete();
reader.close();
//connectPhones.performClick();
/* while (connected) {
try {
Log.d("ClientActivity", "C: Sending command.");
PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket
.getOutputStream())), true);
// WHERE YOU ISSUE THE COMMANDS
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;
}
}
}
For your purpose I have created one example code. This code is working perfectly. You can try this. You can write your code below to //DOWNLOAD FILE HERE comment.
public class MainActivity extends Activity {
boolean connected = false;
Button button_example = null;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
button_example = (Button) findViewById(R.id.button1);
button_example.setOnClickListener(new OnClickListener() {
#Override
public void onClick(View v) {
Toast.makeText(MainActivity.this, "button clicked called", Toast.LENGTH_SHORT).show();
System.out.println("bb message called");
if (!connected) {
Thread thread = new Thread(new Runnable() {
#Override
public void run() {
connected = true;
// DOWNLOAD FILE HERE.
try {
Thread.sleep(1000);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
runOnUiThread(new Runnable() {
public void run() {
connected = false;
button_example.performClick();
}
});
}
});
thread.start();
}
}
});
}
Add this in your onClick method:
btn = (Button) findViewById(R.id.yourButton);
btn.setPressed(false);
btn.invalidate();
Handler handler1 = new Handler();
Runnable r1 = new Runnable() {
public void run() {
btn.performClick();
btn.setPressed(true);
btn.invalidate();
btn.setPressed(false);
btn.invalidate();
}
};
handler1.postDelayed(r1, 1000);
Related
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.
Here is the code for the server
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 >= 0) current += bytesRead;
} while(bytesRead > -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<NetworkInterface> en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements();) {
NetworkInterface intf = en.nextElement();
for (Enumeration<InetAddress> 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();
}
}
}
And this is the client side 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();
}
}
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()
Thanks everyone , I found the error.
The toast messages have to be inside the UI thread or the handler . As I had a few of them in a non UI thread, it began to throw the exception.
This question has been asked quite a few times here , but there is no good answer yet.So I am just posting this question along with my progress. I would like to know if there is a way to perform socket programming between a real device and emulator.
I referred to android developer page : http://developer.android.com/tools/devices/emulator.html
to establish communication between two android devices / and also between two emulators. But there is no way I am able to send data from android device(client) to emulator(as the server). Both of them are connected to the same network and are able to ping each other.
public class ServerActivity extends Activity {
private TextView serverStatus;
private Button Start;
private Button Mark;
private Button Stop;
// DEFAULT IP
public static String SERVERIP = "10.0.2.15";
// DESIGNATE A PORT
public static final int SERVERPORT = 6000;
private Handler handler = new Handler();
private ServerSocket serverSocket;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
serverStatus = (TextView) findViewById(R.id.server_status);
Start = (Button)findViewById(R.id.start);
Mark = (Button)findViewById(R.id.mark);
Stop = (Button)findViewById(R.id.stop);
//SERVERIP = getLocalIpAddress();
Thread fst = new Thread(new ServerThread());
fst.start();
}
public class ServerThread implements Runnable {
public void run() {
try {
if (SERVERIP != null) {
handler.post(new Runnable() {
#Override
public void run() {
serverStatus.setText("Listening on IP: " + SERVERIP +" "+ SERVERPORT);
}
});
serverSocket = new ServerSocket(SERVERPORT);
while (true) {
// LISTEN FOR INCOMING CLIENTS
final Socket client = serverSocket.accept();
handler.post(new Runnable() {
#Override
public void run() {
serverStatus.setText("Connected.");
}
});
try {
handler.post(new Runnable() {
#Override
public void run() {
// DO WHATEVER YOU WANT TO THE FRONT END
// THIS IS WHERE YOU CAN BE CREATIVE
Log.d("ServerActivity", "S: Sending command.");
PrintWriter out;
try {
out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(client.getOutputStream())), true);
// WHERE YOU ISSUE THE COMMANDS
out.println("HeyClient!");
Log.d("ServerActivity", "S: Sent.");
Start.setOnClickListener(new OnClickListener() {
public void onClick(View arg0) {
// TODO Auto-generated method stub
//send click command to start recording to client
}
});
}
catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
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<NetworkInterface> en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements();) {
NetworkInterface intf = en.nextElement();
for (Enumeration<InetAddress> 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();
}
}}
and the client code :
public class ClientActivity extends Activity {
private EditText serverIp;
private TextView serverCommand;
private Button connectPhones;
private String serverIpAddress = "";
private boolean connected = false;
private Handler handler = new Handler();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
serverIp = (EditText) findViewById(R.id.server_ip);
connectPhones = (Button) findViewById(R.id.connect_phones);
connectPhones.setOnClickListener(connectListener);
serverCommand = (TextView)findViewById(R.id.server_commands);
}
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 socket = new Socket(serverAddr, 80);
connected = true;
while (connected)
{
try {
String line = null;
BufferedReader in = new BufferedReader(new InputStreamReader(socket.getInputStream()));
while ((line = in.readLine()) != null) {
Log.d("ClientActivity", line);
serverCommand.setText(line);
if (line == "start")
{
}
}
} 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;
}
}
}
}
I also set up port forwarding to direct incoming connections from android at port 80 to emulator at port 6000. This is was done using telnet.
For some reason, all this doesn't seem to make emulator connect to the incoming connections.
I would be really grateful if someone could help me out.
Credits : Code from http://thinkandroid.wordpress.com/2010/03/27/incorporating-socket-programming-into-your-applications/
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.
Here is the code for the server
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 >= 0) current += bytesRead;
} while(bytesRead > -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<NetworkInterface> en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements();) {
NetworkInterface intf = en.nextElement();
for (Enumeration<InetAddress> 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();
}
}
}
And this is the client side 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();
}
}
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()
Thanks everyone , I found the error.
The toast messages have to be inside the UI thread or the handler . As I had a few of them in a non UI thread, it began to throw the exception.
Good day I tried to connect two android phones by Socket. I have two different applications (the server and client). Server consist of one Activity
public class ShareCameraActivity extends Activity {
/** Called when the activity is first created. */
private TextView serverStatus;
// default ip
public static String SERVERIP = "10.0.2.15";
// designate a port
public static final int SERVERPORT = 12345;
private Handler handler = new Handler();
private ServerSocket serverSocket;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
serverStatus = (TextView) findViewById(R.id.server_status);
SERVERIP = getLocalIpAddress();
Thread fst = new Thread(new ServerThread());
fst.start();
}
public class ServerThread implements Runnable {
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 {
BufferedReader in = new BufferedReader(new InputStreamReader(client.getInputStream()));
String line = null;
while ((line = in.readLine()) != null) {
Log.d("ServerActivity", line);
handler.post(new Runnable() {
#Override
public void run() {
// 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<NetworkInterface> en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements();) {
NetworkInterface intf = en.nextElement();
for (Enumeration<InetAddress> 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();
}
}
}
And client is
public class ShareCameraClientActivity extends Activity {
private EditText serverIp;
private Button connectPhones;
private String serverIpAddress = "10.48.97.53";
private boolean connected = false;
private Handler handler = new Handler();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
serverIp = (EditText) findViewById(R.id.server_ip);
connectPhones = (Button) findViewById(R.id.connect_phones);
connectPhones.setOnClickListener(connectListener);
}
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 {
serverIpAddress = "10.48.97.53";
InetAddress serverAddr = InetAddress.getByName(serverIpAddress);
Log.d("ClientActivity", "C: Connecting...");
Socket socket = new Socket(serverAddr, ServerActivity.SERVERPORT);
connected = true;
while (connected) {
try {
Log.d("ClientActivity", "C: Sending command.");
PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket
.getOutputStream())), true);
// where you issue the commands
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;
}
}
}
}
Server works fine and take my his IP adress, but, client don't whant to connect him, and alweys go to exeption that connection is timeout.
Need help... I have understood how to make server-client socket conection... It works fie... Now I want to transfer files from server to client and back.... here are my sources...
Socket server...
public class ServerActivity extends Activity {
private TextView serverStatus;
// default ip
public static String SERVERIP = "192.168.1.1";
// 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.main);
serverStatus = (TextView) findViewById(R.id.server_status);
SERVERIP = getLocalIpAddress();
Thread fst = new Thread(new ServerThread());
fst.start();
}
public class ServerThread implements Runnable {
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();
/////////////////////////////////
File myFile = new File ("/sdcard/frostwire.apk");
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 = client.getOutputStream();
System.out.println("Sending...");
serverStatus.setText("sending 123.exe...");
os.write(mybytearray,0,mybytearray.length);
os.flush();
client.close();
////////////////////////////
handler.post(new Runnable() {
#Override
public void run() {
serverStatus.setText("Connected.");
}
});
try {
BufferedReader in = new BufferedReader(new InputStreamReader(client.getInputStream()));
String line = null;
while ((line = in.readLine()) != null) {
Log.d("ServerActivity", line);
handler.post(new Runnable() {
#Override
public void run() {
// 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<NetworkInterface> en = NetworkInterface.getNetworkInterfaces(); en.hasMoreElements();) {
NetworkInterface intf = en.nextElement();
for (Enumeration<InetAddress> 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();
}
}
}
Socket Client...
public class ClientActivity extends Activity {
private EditText serverIp;
private Button connectPhones;
private String serverIpAddress = "";
private boolean connected = false;
private Handler handler = new Handler();
int filesize; // filesize temporary hardcoded
long start = System.currentTimeMillis();
int bytesRead;
int current = 0;
#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);
}
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 socket = new Socket(serverAddr, ServerActivity.SERVERPORT);
connected = true;
////////// // receive file
byte [] mybytearray = new byte [filesize];
InputStream is = socket.getInputStream();
FileOutputStream fos = new FileOutputStream("/sdcard/frostwire.apk");
BufferedOutputStream bos = new BufferedOutputStream(fos);
bytesRead = is.read(mybytearray,0,mybytearray.length);
current = bytesRead;
do {
bytesRead =
is.read(mybytearray, current, (mybytearray.length-current));
if(bytesRead >= 0) current += bytesRead;
} while(bytesRead > -1);
bos.write(mybytearray, 0 , current);
bos.flush();
long end = System.currentTimeMillis();
System.out.println(end-start);
bos.close();
socket.close();
//////////////////////////////
while (connected) {
try {
Log.d("ClientActivity", "C: Sending command.");
PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(socket
.getOutputStream())), true);
// where you issue the commands
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;
}
}
}
}
Pieces of source which are marked by "///////" don't work.... Help
Better you replace the following your code
do {
bytesRead =
is.read(mybytearray, current, (mybytearray.length-current));
if(bytesRead >= 0) current += bytesRead;
} while(bytesRead > -1);
with the following one
do {
bytesRead =is.read(mybytearray, current, (mybytearray.length-current));
if(bytesRead > 0)
{
current += bytesRead;
}
} while(bytesRead > 0);
Then try it
after going through above discussion i would like to add few comments-
Have you added permission code for reading sdcard in android manifest file ? If not you should add following code as the server is accessing External Storage. Do for the client also to write in external storage.
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
Else, the directory you have provided is not correct. Check the directory.
In the client program, you have defined file_size which is not assigned any value nowhere in the program.
I would also like to suggest that, the file_size in the client program should be greater than the file to be transfer and size is in byte.