I'm having trouble loading PDF files with Japanese characters, since I'm using MuPDF library my implementation is to download the PDF first from the link then open it with MuPDF from the SDcard. Now it cannot be opened since the PDF was not downloaded in the first place.
Here's my code:
try {
URL url = new URL(path[0]);
URLConnection urlConnection = url.openConnection();
urlConnection.connect();
// getting file length
int lengthOfFile = urlConnection.getContentLength();
// input stream to read file - with 8k buffer
InputStream input = new BufferedInputStream(
url.openStream(), 8192);
String fileExtension = MimeTypeMap.getFileExtensionFromUrl(pdfUrl);
pdfFileName = URLUtil.guessFileName(pdfUrl, null, fileExtension);
// Output stream to write file
OutputStream output = new FileOutputStream(Environment
.getExternalStorageDirectory().getPath()
+ "/SAMPLE/" + pdfFileName);
byte data[] = new byte[1024];
long total = 0;
while ((count = input.read(data)) != -1) {
total += count;
// publishing the progress....
// After this onProgressUpdate will be called
publishProgress(""
+ (int) ((total * 100) / lengthOfFile));
// writing data to file
output.write(data, 0, count);
}
// flushing output
output.flush();
// closing streams
output.close();
input.close();
} catch (Exception e) {
Log.e("Error: ", e.getMessage());
}
It can download successfully any PDF source links except those with Japanese characters.
Related
I'm trying to convert this image url to file object :
https://graph.facebook.com/v4.0/10211842143528384/picture?height=200&width=200&migration_overrides=%7Boctober_2012%3Atrue%7D
this link came from the facebook response after i logged in.
i used this method to convert this image url to File object:
URL url = null;
try {
url = new URL(sharePreferences.getPreferencesProfilePicture());
} catch (MalformedURLException e) {
e.printStackTrace();
}
File f = new File(url.getFile());
Log.d("CHECKER",""+f.exists());
Log.d("CHECKER",""+f.length());
but when i check it's length, its just 0 and the file exist is false.
You have a file with length 0 because you are just creating it with the name of the result of url.getFile(), url.getFile() returns a string which corresponds to the fetched file name.So you end up with a file named picture:
https://graph.facebook.com/v4.0/10211842143528384/picture?height=200&width=200&migration_overrides=%7Boctober_2012%3Atrue%7 But what about the contents? you have to download them fron the internet as a stream and feed that stream into a file. There many ways of doing that with plain Java. A basic copy-paste from https://www.baeldung.com/java-download-file
try (BufferedInputStream in = new BufferedInputStream(new URL(FILE_URL).openStream());
FileOutputStream fileOutputStream new FileOutputStream(FILE_NAME)) {
byte dataBuffer[] = new byte[1024];
int bytesRead;
while ((bytesRead = in.read(dataBuffer, 0, 1024)) != -1) {
fileOutputStream.write(dataBuffer, 0, bytesRead);
}
} catch (IOException e) {
// handle exception
}
Since you are using android I would strongly encourage you to use fully featured Network libraries such as OkHttp3, Retrofit or Volley, but guessing your knowledge I think you will do better learning the basics on Java then jump to the mentioned libraries.
Remember, for android you need the INTERNET permission to access the internet, then if you download into a file on the external storage you would also need the EXTERNAL_STORAGE permission. Snippet for android:
try {
URLConnection conection = url.openConnection();
conection.connect();
int lenghtOfFile = conection.getContentLength();
// Read from the Network stream
InputStream input = new BufferedInputStream(url.openStream());
OutputStream output = new FileOutputStream(Environment
.getExternalStorageDirectory().toString()
+ "/downloaded.png");
byte data[] = new byte[1024];
while ((count = input.read(data)) != -1) {
total += count;
// Feed the bytes read from the input stream into our output stream
output.write(data, 0, count);
}
// Flushing the out stream.
output.flush();
// closing streams
output.close();
input.close();
} catch (Exception e) {
Log.e("Error: ", e.getMessage());
}
This snippet does networking stuff so you need to run it on a background thread. I hope my answer helps you, if not, let me know what else can I do for you.
I'm trying to download files from Firebase storage. But when I download it, it's giving some files with .bin extension. But I want to get the original file name.
Here is my code.
try {
URL url = new URL(f_url[0]);
URLConnection conection = url.openConnection();
conection.connect();
int lenghtOfFile = conection.getContentLength();
InputStream input = new BufferedInputStream(url.openStream(),
8192);
OutputStream output = new FileOutputStream(Environment
.getExternalStorageDirectory().toString()
+"/Download/"+ URLUtil.guessFileName(f_url[0], null, null));
Log.i("File name",URLUtil.guessFileName(f_url[0], null, null));
byte data[] = new byte[1024];
long total = 0;
while ((count = input.read(data)) != -1) {
total += count;
publishProgress("" + (int) ((total * 100) / lenghtOfFile));
output.write(data, 0, count);
}
output.flush();
output.close();
input.close();
} catch (Exception e) {
Log.e("Error: ", e.getMessage());
}
In there f_url is the firebase download url. Thank you.
The built in way of doing this is actually quite straightforward:
StorageReference reference = storage.getReferenceFromUrl("https://firebasestorage.googleapis.com/...");
// Assuming that the file is "name.extension" in Storage
String name = reference.getName().split(".")[0]
String extension = reference.getName().split(".")[1]
File localFile = File.createTempFile(name, extension);
reference.getFile(localFile).addOnSuccessListener(new OnSuccessListener<FileDownloadTask.TaskSnapshot>() {
#Override
public void onSuccess(FileDownloadTask.TaskSnapshot taskSnapshot) {
// Local temp file has been created
}
});
But if you don't want to do it the easy way...
Let's take a brief look at how you're naming your file: URLUtil.guessFileName(f_url[0], null, null)
According to the URLUtil.guessFileName() docs: "Guesses canonical filename that a download would have, using the URL and contentDisposition. File extension, if not defined, is added based on the mimetype."
I'm assuming that your f_url[0] is a file with no extension, and since you provide no contentDisposition or mimetype as arguments to guessFileName, there's no way it can possibly know what file extension you want.
You can get the contentDisposition and contentType (same as mimetype) from Storage Metadata, and if you name your file in Storage with an extension, you should be good to go.
my code works fine, it downloads image to sd card, however , i get this warning where i defined my sd card path "Do not hardcode "/sdcard/"; use Environment.getExternalStorageDirectory().getPath() instead"
#Override
protected String doInBackground(String... aurl) {
int count;
try {
URL url = new URL(aurl[0]);
URLConnection conexion = url.openConnection();
conexion.connect();
int lenghtOfFile = conexion.getContentLength();
Log.d("ANDRO_ASYNC", "Lenght of file: " + lenghtOfFile);
InputStream input = new BufferedInputStream(url.openStream());
OutputStream output = new FileOutputStream("/sdcard/.temp");//.temp is the image file name
byte data[] = new byte[1024];
long total = 0;
while ((count = input.read(data)) != -1) {
total += count;
publishProgress("" + (int) ((total * 100) / lenghtOfFile));
output.write(data, 0, count);
}
output.flush();
output.close();
input.close();
} catch (Exception e) {
}
return null;
}
protected void onProgressUpdate(String... progress) {
Log.d("ANDRO_ASYNC", progress[0]);
}
the problem is, if i use the suggested solution, then i won't be able to give my downloaded file a new name (".temp")
When working with files and directories, it's better to work with File objects rather than with strings. Here's how you can address the warning:
File dir = Environment.getExternalStorageDirectory();
File tmpFile = new File(dir, ".temp");
OutputStream output = new FileOutputStream(tmpFile);
That creates a File object that points to a file named ".temp" in the environment's external storage directory. It then opens it for writing using a different constructor of the FileOutputStream class.
If you need the file path as a string instead (say, for printing), you can do that too:
String tmpFileString = tmpFile.getPath();
Or if you decide to use the java.nio API in the future and need a Path object:
Path tmpFilePath = tmpFile.toPath();
I have application for Android, that downloading files from remote server. And my app downloading files much more slowly as ios application the same file at the same Internet connection.
That my code:
URL url = new URL(fileUrl);
URLConnection connection = url.openConnection();
connection.connect();
// this will be useful so that you can show a tipical 0-100%
// progress bar
int lenghtOfFile = connection.getContentLength();
// download the file
InputStream input = new BufferedInputStream(url.openStream(),
8192);
// Output stream
FileOutputStream output =
context.openFileOutput(new File(context.getFilesDir(), fileName).getName(), Context.MODE_PRIVATE);
byte data[] = new byte[1024];
long total = 0;
while ((count = input.read(data)) != -1) {
total += count;
// publishing the progress....
// After this onProgressUpdate will be called
publishProgress(String.valueOf((int) ((total * 100) / lenghtOfFile)));
// writing data to file
output.write(data, 0, count);
}
// flushing output
output.flush();
// closing streams
output.close();
input.close();
What can help in solving this problem.
I am trying to create an app that can download music files.
How to download mp3 file in android from a URL and save it in SD card??
I use this code but lenghtOfFile always <=350:
String fileUrl = (String) params[0];
path = (String) params[1];
InputStream input = null;
OutputStream output = null;
HttpURLConnection connection = null;
int count;
try {
URL url = new URL(fileUrl);
URLConnection connection = url.openConnection();
connection .connect();
// this will be useful so that you can show a tipical 0-100% progress bar
int lenghtOfFile = connection .getContentLength();
// downlod the file
input = new BufferedInputStream(url.openStream());
output = new FileOutputStream(path);
byte data[] = new byte[1024];
long total = 0;
while ((count = input.read(data)) != -1) {
total += count;
// publishing the progress....
publishProgress((int)(total*100/lenghtOfFile));
output.write(data, 0, count);
}
output.flush();
output.close();
input.close();
url files :
http://snd1.tebyan.net/1391/12/08_Khaneh_D_117323.mp3
http://snd1.tebyan.net/1393/12/100_Pedar_Va_Madar_D_148797.mp3
and .....
update :
int code= connection.getResponseCode();\\302
String _result= connection.getResponseMessage();\\ found
note :
Files do download in Samsung Galaxy S3, but files do not download in Samsung tablet N8000
You could implement HMTL5 and do it from there, might need some JS...
for 302 response ,you need connection.setInstanceFollowRedirects(true) to follow it. before connection.connect()