Develop Reference

PDF file write issue - BluetoothSocket OutputStream.write()

I'm facing an issue writing PDF file to BluetoothSocket OutputStream in my android project. Text file write(print) is working fine but when I'm writing PDF file, it prints out some gibberish text not the data inside the PDF file. Here is my code snippet:
File file = new File("/storage/emulated/0/Download/sample.pdf");
inputStream = new FileInputStream(file);
byte[] bytes = new byte[(int) file.length()];
int nextByte;
while ((nextByte = inputStream.read(bytes, 0, bytes.length)) != -1) {
outputStream.write(bytes, 0, nextByte);
outputStream.flush();
}
inputStream.close();
outputStream.close();
Here outputStream is BluetoothSocket OutputStream.(ex: bluetoothSocket.getOutputStream())

I can't access a video after download it in android

I have a code to download a video from my server and save it in the sd card. I use this code:
String videoURL = "http://www.myapp.com" + key + "/"+key+".avi";
String PATHSdcard = getSDFile();
try {
//set the download URL, a url that points to a file on the internet
//this is the file to be downloaded
URL url = new URL(videoURL);
//create the new connection
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
//set up some things on the connection
urlConnection.setRequestMethod("GET");
urlConnection.setDoOutput(true);
//and connect!
urlConnection.connect();
//set the path where we want to save the file
//in this case, going to save it on the root directory of the
//sd card.
File SDCardRoot = Environment.getExternalStorageDirectory();
//create a new file, specifying the path, and the filename
//which we want to save the file as.
File file = new File(PATHSdcard,key+".avi");
//this will be used to write the downloaded data into the file we created
FileOutputStream fileOutput = new FileOutputStream(file);
//this will be used in reading the data from the internet
InputStream inputStream = urlConnection.getInputStream();
//create a buffer...
byte[] buffer = new byte[1024];
int bufferLength = 0; //used to store a temporary size of the buffer
//now, read through the input buffer and write the contents to the file
while ( (bufferLength = inputStream.read(buffer)) > 0 ) {
//add the data in the buffer to the file in the file output stream (the file on the sd card
fileOutput.write(buffer, 0, bufferLength);
}
//close the output stream when done
fileOutput.flush();
fileOutput.close();
sendBroadcast (
new Intent(Intent.ACTION_MEDIA_MOUNTED,
Uri.parse("file://" + Environment.getExternalStorageDirectory()))
);
//catch some possible errors...
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
I download it correctly, but I can't play the video after downloaded it.
If I close my application and open again, the video works fine. Any solution?
Thanks in advance

Ensure you have the correct permissions to write to the file. In your manifest file, include this line
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />.
UPDATED:
I am not sure what problem in your code, but can you try my code, maybe it will work:
public void DownloadFromUrl(String DownloadUrl, String fileName) {
try {
File root = android.os.Environment.getExternalStorageDirectory();
File dir = new File (root.getAbsolutePath() + "/your_downloads");
if(dir.exists()==false) {
dir.mkdirs();
}
URL url = new URL(DownloadUrl); //you can write here any link
File file = new File(dir, fileName);
/* Open a connection to that URL. */
URLConnection ucon = url.openConnection();
/*
* Define InputStreams to read from the URLConnection.
*/
InputStream is = ucon.getInputStream();
BufferedInputStream bis = new BufferedInputStream(is);
/*
* Read bytes to the Buffer until there is nothing more to read(-1).
*/
ByteArrayBuffer baf = new ByteArrayBuffer(5000);
int current = 0;
while ((current = bis.read()) != -1) {
baf.append((byte) current);
}
/* Convert the Bytes read to a String. */
FileOutputStream fos = new FileOutputStream(file);
fos.write(baf.toByteArray());
fos.flush();
fos.close();
} catch (IOException e) {
Log.d("DownloadManager", "Error: " + e);
}
}

Reading InputStream after writing

I am trying to read InputStream after writing output stream to sdcard. I have downloaded file from HttpURLConnection. File is successfuly written to sdcard. But I am trying to read inputstream from same file but contents are not being read properly. On emulator some contents are shown but on actual device contents are not shown. Can you please help what can be the issue? I am posting downloading, writing and reading code.
fileUrl = new URL(filename);
HttpURLConnection connection = (HttpURLConnection)fileUrl.openConnection();
InputStream is = connection.getInputStream();
/**
* Create file with input stream
*/
File downloadFile = new File("/sdcard/", "myFile3.pdf");
downloadFile.createNewFile();
final FileOutputStream outputStream = new FileOutputStream(downloadFile);
int availbleLength = is.available();
byte[] bytes = new byte[availbleLength];
int len1 = 0;
while ((len1 = is.read(bytes)) > 0) {
outputStream.write(bytes, 0, len1);
}
outputStream.flush();
outputStream.close();
File myFile = new File("/sdcard/myFile3.pdf");
InputStream inputStream = new FileInputStream(myFile);
byte[] buffer = new byte[inputStream.available()];
inputStream.read(buffer);
System.out.println("Byte Lenght: " + buffer.length);

inputStream.available() is only an estimate not actual length of the complete input data.
FileInputStream.available()

Not able to transfer image everytime through socket Android

I need to develop an application to transfer image continuously from android to android which should be received as an video on the client side..and i have two applications which one (server) will send the file through socket connected by wifi and other should the client side should recive the image which is sent...currently am just saving it in one location in the client side...am able to receive the file correctly...but the problem is am not able to send all files correctly all the time...
Means some time the image file will be transfered and some time i ll not be able to receive and when i ll not be able to receive i am getting an exception as
: java.io.UTFDataFormatException: ...and the file is not written and saved on the receiving side...
If am not able to receive images continuously...i can think there is some problem in the code..but am able to transfer it some times..and some time not able to transfer...am not able to figure what the issue is...plz any guidance
the error is:
11-18 10:38:17.351: W/System.err(1001): java.io.UTFDataFormatException: bad second or third byte at 2
11-18 10:38:17.359: W/System.err(1001): at java.nio.charset.ModifiedUtf8.decode(ModifiedUtf8.java:53)
11-18 10:38:17.359: W/System.err(1001): at java.io.DataInputStream.decodeUTF(DataInputStream.java:444)
11-18 10:38:17.359: W/System.err(1001): at java.io.DataInputStream.decodeUTF(DataInputStream.java:438)
11-18 10:38:17.359: W/System.err(1001): at java.io.DataInputStream.readUTF(DataInputStream.java:433)
and the file is not saved when i get this exception..
Many scenarios i have tested by capturing image and saving and sending...and also compressing the image and sending...in these scenarios some very rarely it is going....am not able to figure out it...
Sender code:
File myFile = new File(sdCard+"/image/image.jpg");
byte[] mybytearray = new byte[(int) myFile.length()];
FileInputStream fis = new FileInputStream(myFile);
BufferedInputStream bis = new BufferedInputStream(fis);
//bis.read(mybytearray, 0, mybytearray.length);
DataInputStream dis = new DataInputStream(bis);
dis.readFully(mybytearray, 0, mybytearray.length);
OutputStream os = socket.getOutputStream();
tv.setText("Send file name size to server");
//Sending file name,file size and to the server
DataOutputStream dos = new DataOutputStream(os);
dos.writeUTF(myFile.getName());
dos.writeLong(mybytearray.length);
dos.write(mybytearray, 0, mybytearray.length);
dos.flush();
socket.close();
tv.setText("Socket Close");
tv.setText("Sent");
Receiver Code:
File dir = new File (sdCard.getAbsolutePath() + "/dir1/dir2");
dir.mkdirs();
String fileName = clientData.readUTF();
File file = new File(dir,fileName);
OutputStream output = new FileOutputStream(file);
long size = clientData.readLong();
byte[] buffer = new byte[1024];
while (size > 0 && (bytesRead = clientData.read(buffer, 0, (int)Math.min(buffer.length, size))) != -1)
{
output.write(buffer, 0, bytesRead);
size -= bytesRead;
System.out.println("Writing");
}
// status.setText("Received");
// Closing the FileOutputStream handle
output.close();
s.close();
Thanks and Regards,
Divya.K

I was stuck on this thing i combined few days of my search and reached to this... Try it and see if works for you..
Bitmap myBitmap = null;
try {
File imgFile = new File(imgPath);
if (imgFile.exists()) {
File image = new File(imgPath, "imagename.jpg");
BitmapFactory.Options bmOptions = new BitmapFactory.Options();
myBitmap = BitmapFactory.decodeFile(image.getAbsolutePath(),bmOptions);
//myBitmap = Bitmap.createScaledBitmap(bitmap,parent.getWidth(),parent.getHeight(),true); //uncomment this if you want to scale the image
//imageView.setImageBitmap(bitmap);//to set bitmap to image view
}
Socket sock = new Socket("192.168.1.1", 80);//ip adress and port number
ByteArrayOutputStream bos = new ByteArrayOutputStream();
if (myBitmap != null) {
myBitmap.compress(Bitmap.CompressFormat.PNG, 0 /*ignored for PNG*/, bos);
}
byte[] bitmapdata = bos.toByteArray();
ByteArrayInputStream bs = new ByteArrayInputStream(bitmapdata);
BufferedInputStream bis = new BufferedInputStream(bs);
bis.read(bitmapdata, 0, bitmapdata.length);
OutputStream os = sock.getOutputStream();
System.out.println("Sending...");
os.write(bitmapdata, 0, bitmapdata.length);
os.flush();
sock.close();
} catch (Exception e) {
e.printStackTrace();
}

the download image be corrupted at android app

simply i need to download an image but the problem is the image get corrupted !!!
i find many way to download the image but still this problem appeared .
i try do this :
File path = Environment.getExternalStoragePublicDirectory(
Environment.DIRECTORY_PICTURES);
File file2 = new File(path,"DemoPictureX.png");
InputStream is=(InputStream) new URL("http://androidsaveitem.appspot.com/downloadjpg").getContent();
OutputStream os = new FileOutputStream(file2);
byte[] data = new byte[is.available()];
is.read(data);
os.write(data);
is.close();
os.close();
i think it read just read some row from the image !!!

you need a loop and read with a smaller buffer (like 1024 bytes) from the stream.
URL url = new URL("your url here");
URLConnection connection = url.openConnection();
InputStream is = connection.getInputStream();
BufferedInputStream bis = new BufferedInputStream(is);
FileOutputStream fos = new FileOutputStream(targetFile);
byte buffer[] = new byte[1024];
int read;
while ((read = bis.read(buffer)) > 0) {
fos.write(buffer, 0, read);
}
fos.flush();
fos.close();
bis.close();
is.close();
This should work for you