Develop Reference

Hey! I wanna save in ExternalStoragePublic file which I receive from the internet, but I really stuck. May you help me with code?

url = "http://r8---sn-03guxaxjvh-3c2r.googlevideo.com/videoplayback?sparams=dur%2Cei%2Cid%2Cinitcwndbps%2Cip%2Cipbits%2Citag%2Clmt%2Cmime%2Cmm%2Cmn%2Cms%2Cmv%2Cpl%2Cratebypass%2Csource%2Cexpire&mn=sn-03guxaxjvh-3c2r&ip=212.113.45.145&source=youtube&mm=31&mv=m&mime=video%2Fmp4&mt=1505092537&ipbits=0&initcwndbps=685000&dur=2223.728&id=o-AM9pUI9o5NsL8P-jGi5-w17xJOo-VVQ-TrWlMZaV17cp&key=yt6&lmt=1499875418101464&signature=4AACC08B22F2F1F343F5A044188CD751A6AD2F08.A7BA661DDC07639A7E414169226A35A700888AF3&ms=au&ei=HOS1WezYFZfq7gT40rnoAw&itag=22&pl=22&expire=1505114236&ratebypass=yes&title=Gothic+Rock+-+Dark+Music";
streamPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
try {
streamPlayer.setDataSource(url);
} catch (IOException e) {
e.printStackTrace();
}
try {
streamPlayer.prepare();
} catch (IOException e) {
e.printStackTrace();
}
streamPlayer.start();`
my question is how to store on a device my streamPlayer object?

Try this
private static void downloadFile(String url, File outputFile) {
try {
URL u = new URL(url);
URLConnection conn = u.openConnection();
int contentLength = conn.getContentLength();
DataInputStream stream = new DataInputStream(u.openStream());
byte[] buffer = new byte[contentLength];
stream.readFully(buffer);
stream.close();
DataOutputStream fos = new DataOutputStream(new
FileOutputStream(outputFile));
fos.write(buffer);
fos.flush();
fos.close();
} catch(FileNotFoundException e) {
return; // swallow a 404
} catch (IOException e) {
return; // swallow a 404
}
}

Udp not receiving data from server (android client, pc java server)

i am making a chat application for android using UDP.
Everything works fine in lan devices, I can send and receive messages from client and from server.
When i connect to an other network with my android, i can send messages, the server receives them but the response is never received on android.
Client Receive code
Runnable periodicTask = new Runnable() {
public void run() {
// Invoke method(s) to do the work
System.out.println("Waiting for data");
byte[] receiveData = new byte[2028];
byte[] sendData = new byte[2028];
boolean portTaken=false;
DatagramSocket serverSocket=null;
ServerSocket socket = null;
try {
socket = new ServerSocket(6667);
} catch (IOException e) {
System.out.println("ERRORRRRRRRRRRRRRR");
} finally {
if (socket != null)
try {
socket.close();
serverSocket= new DatagramSocket(6667);
} catch (IOException e) { e.printStackTrace(); }
}
DatagramPacket receivePacket = new DatagramPacket(receiveData,receiveData.length);
try {
serverSocket.receive(receivePacket);
System.out.println("GOT THEM!");
} catch (IOException e) {
e.printStackTrace();
}
ByteArrayInputStream in = new ByteArrayInputStream(receiveData);
ObjectInputStream is = null;
try {
is = new ObjectInputStream(in);
} catch (IOException e) {
e.printStackTrace();
}
Data student = null;
try {
student = (Data) is.readObject();
l.add(student.toString());
mHandler.sendEmptyMessage(0);
System.out.println(student);
serverSocket.close();
} catch (ClassNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
};
Server Send Code
for (DatagramPacket packet:clients){
if (!packet.getAddress().equals(receivePacket.getAddress())){
System.out.println("current ip address " + receivePacket.getAddress());
System.out.println("Sending to " + packet.getAddress());
DatagramSocket s = new DatagramSocket();
InetAddress local =packet.getAddress();//editTextAddress.getText().toString());//InetAddress.getByName("192.168.1.74");
System.out.println(local.toString());
//int msg_length =student.//sentence.length();
ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
ObjectOutputStream os = new ObjectOutputStream(outputStream);
os.writeObject(student);
byte[] data2 = outputStream.toByteArray();
int msg_length =data2.length;
DatagramPacket p = new DatagramPacket(data2, msg_length, local,
6667);
s.send(p);
s.close();
}
What might be the case ?
Thank you for your time

update textview from internet

I want to make a TextView or Imageview that request info from the internet, as if it was a newspapper that's updated daily, I want to do something similar but I don't know how.
I guess I should have a server or something but could someone explain me the process? and which server or what to do?

first you need to enable the permission in the android manifest
<uses-permission android:name="android.permission.INTERNET" />
than you can use a textView like this
new Thread() {
#Override
public void run() {
String path ="http://host.com/info.txt"; // your webpage with text
URL u = null;
try {
u = new URL(path);
HttpURLConnection c = (HttpURLConnection) u.openConnection();
c.setRequestMethod("GET");
c.connect();
InputStream in = c.getInputStream();
final ByteArrayOutputStream bo = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
in.read(buffer); // Read from Buffer.
bo.write(buffer); // Write Into Buffer.
runOnUiThread(new Runnable() {
#Override
public void run() {
TextView text = (TextView) findViewById(R.id.TextView1);
text.setText(bo.toString());
try {
bo.close();
} catch (IOException e) {
e.printStackTrace();
}
}
});
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (ProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}.start();

I have to restart my Java socket connection for multiple file transfer

I have created a small server client program for Android. It is working like charm except one thing. First session of file transfer works without any problem, but when I try to send another file, I can't do it without restarting my socket connection. I wanted to achieve this:
1. Start Android server
2. Connect remote client
3. Transfer as many files as one wishes in the same session (without having to restart server and reconnecting client)
How can it be done? Any help would be appreciated!
Here's my code snippet:
Server side methods:
public void initializeServer() {
try {
serverSocket = new ServerSocket(4444);
runOnUiThread( new Runnable() {
#Override
public void run() {
registerLog("Server started successfully at: "+ getLocalIpAddress());
registerLog("Listening on port: 4444");
registerLog("Waiting for client request . . .");
}
});
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
Log.d("Listen failed", "Couldn't listen to port 4444");
}
try {
socket = serverSocket.accept();
runOnUiThread( new Runnable() {
#Override
public void run() {
registerLog("Client connected: "+socket.getInetAddress());
}
});
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
Log.d("Acceptance failed", "Couldn't accept client socket connection");
}
}
Sending file to client:
public void sendFileDOS() throws FileNotFoundException {
runOnUiThread( new Runnable() {
#Override
public void run() {
registerLog("Sending. . . Please wait. . .");
}
});
final long startTime = System.currentTimeMillis();
final File myFile= new File(filePath); //sdcard/DCIM.JPG
byte[] mybytearray = new byte[(int) myFile.length()];
FileInputStream fis = new FileInputStream(myFile);
BufferedInputStream bis = new BufferedInputStream(fis);
DataInputStream dis = new DataInputStream(bis);
try {
dis.readFully(mybytearray, 0, mybytearray.length);
OutputStream os = socket.getOutputStream();
//Sending file name and file size to the server
DataOutputStream dos = new DataOutputStream(os);
dos.writeUTF(myFile.getName());
dos.writeLong(mybytearray.length);
dos.write(mybytearray, 0, mybytearray.length);
dos.flush();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
runOnUiThread( new Runnable() {
#Override
public void run() {
long estimatedTime = (System.currentTimeMillis() - startTime)/1000;
registerLog("File successfully sent");
registerLog("File size: "+myFile.length()/1000+" KBytes");
registerLog("Elapsed time: "+estimatedTime+" sec. (approx)");
registerLog("Server stopped. Please restart for another session.");
}
});
}
Client side (running on PC):
public class myFileClient {
final static String servAdd="10.142.198.127";
static String filename=null;
static Socket socket = null;
static Boolean flag=true;
/**
* #param args
*/
public static void main(String[] args) throws IOException {
// TODO Auto-generated method stub
initializeClient();
receiveDOS();
}
public static void initializeClient () throws IOException {
InetAddress serverIP=InetAddress.getByName(servAdd);
socket=new Socket(serverIP, 4444);
}
public static void receiveDOS() {
int bytesRead;
InputStream in;
int bufferSize=0;
try {
bufferSize=socket.getReceiveBufferSize();
in=socket.getInputStream();
DataInputStream clientData = new DataInputStream(in);
String fileName = clientData.readUTF();
System.out.println(fileName);
OutputStream output = new FileOutputStream("//home//evinish//Documents//Android//Received files//"+ fileName);
long size = clientData.readLong();
byte[] buffer = new byte[bufferSize];
while (size > 0
&& (bytesRead = clientData.read(buffer, 0,
(int) Math.min(buffer.length, size))) != -1) {
output.write(buffer, 0, bytesRead);
size -= bytesRead;
}
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}

Try flushing just after
output.write(buffer, 0, bytesRead);
If this still doesn't work I found mine server/client works best with objectoutputstreams that you use in the the following way.
oos = new ObjectOutputStream(socket.getOutputStream());
ois = new ObjectInputStream(socket.getInputStream());
// always call flush and reset after sending anything
oos.writeObject(server.getPartyMembersNames());
oos.flush();
oos.reset();
YourObject blah = (YourObject) ois.readObject();

Android read text file from internet

I want to read a remote text file and show its content in a textview. I have written this below code, but it doesn't get any information from the text file.
How can I find the reason of this problem or solve it?
isn't there anything wrong in my code?
private void readFile()
{
try {
String path ="http://host.com/info.txt";
URL u = new URL(path);
HttpURLConnection c = (HttpURLConnection) u.openConnection();
c.setRequestMethod("GET");
c.setDoOutput(true);
c.connect();
InputStream in = c.getInputStream();
Log.e("value",in.toString());
AssetManager mngr=getAssets();
ByteArrayOutputStream bo = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
in.read(buffer); // Read from Buffer.
bo.write(buffer); // Write Into Buffer.
TextView text = (TextView) findViewById(R.id.TextView1);
text.setText(bo.toString());
bo.close();
}
catch (NetworkOnMainThreadException e) {
}
catch (MalformedURLException e) {
e.printStackTrace();
} catch (FileNotFoundException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}

Did you added internet permission to your Manifest file?
Are you launching your code in separate thread (please don't catch NetworkOnMainThreadException)
Check LogCat what exception do you have?
Removed c.setDoOutput(true); this is used to send data to server.
Here how it should be:
new Thread() {
#Override
public void run() {
String path ="http://host.com/info.txt";
URL u = null;
try {
u = new URL(path);
HttpURLConnection c = (HttpURLConnection) u.openConnection();
c.setRequestMethod("GET");
c.connect();
InputStream in = c.getInputStream();
final ByteArrayOutputStream bo = new ByteArrayOutputStream();
byte[] buffer = new byte[1024];
in.read(buffer); // Read from Buffer.
bo.write(buffer); // Write Into Buffer.
runOnUiThread(new Runnable() {
#Override
public void run() {
TextView text = (TextView) findViewById(R.id.TextView1);
text.setText(bo.toString());
try {
bo.close();
} catch (IOException e) {
e.printStackTrace();
}
}
});
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (ProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
}
}.start();