Develop Reference

Download file within the app by clicking on the weblink.

I am developing app like playstore in which user can download any app. i have many apps in my application that i got from my website through wp api v2. when we click on any of the available application detail opened and it have a download link. when we click on the link it goes to the browser but what i want is when we click on any of the apps downloading link downloading should start within my app with progress bar. i didn't found any appropriate solution yet on stack or anywhere.
Here is the screenshot attached for better understanding. arrow is pointing to the downloading link.

Try this code, you can put this on click of the link(textview)
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
}
}

you can use intent service to download the app.
Here is the code :
public class DownloadService extends IntentService {
File cacheDir;
public DownloadService() {
super("DownloadService");
}
#Override
public void onCreate() {
super.onCreate();
String tmpLocation =
Environment.getExternalStorageDirectory().getPath();
cacheDir = new File(tmpLocation);
if (!cacheDir.exists()) {
cacheDir.mkdirs();
}
}
#Override
protected void onHandleIntent(Intent intent) {
String remoteUrl = intent.getExtras().getString("url");
String location;
String filename =
remoteUrl.substring(
remoteUrl.lastIndexOf(File.separator) + 1);
File tmp = new File(cacheDir.getPath()
+ File.separator + filename);
if (tmp.exists()) {
location = tmp.getAbsolutePath();
stopSelf();
return;
}
try {
URL url = new URL(remoteUrl);
HttpURLConnection httpCon =
(HttpURLConnection) url.openConnection();
if (httpCon.getResponseCode() != 200)
throw new Exception("Failed to connect");
InputStream is = httpCon.getInputStream();
ByteArrayOutputStream out = new ByteArrayOutputStream();
byte[] buf = new byte[1024];
int n = 0;
while (-1 != (n = is.read(buf))) {
out.write(buf, 0, n);
}
out.close();
is.close();
byte[] response = out.toByteArray();
FileOutputStream fos = new FileOutputStream(tmp);
fos.write(response);
fos.flush();
fos.close();
is.close();
location = tmp.getAbsolutePath();
} catch (Exception e) {
Log.e("Service", "Failed!", e);
}
}
}
Run this service with url passed in the intent

Blank PDF when save from okHttp

I have to save pdf file using bytes from http response.
If file is small (about hundreds of bytes, less than 1k) everything is ok, but if file is too large I saw (using another app via Intent) all pages white (number of pages is correct).
I save the document in external storage and pass uri to intent.
This is my code to get file from server and save it to external storage:
public static Observable<Integer> getDocument(final String id, final String service, final String filename){
return Observable.create(new Observable.OnSubscribe<Integer>() {
#Override
public void call(Subscriber<? super Integer> subscriber) {
InputStream inputStream = null;
FileOutputStream outputStream = null;
OkHttpClient client = HypeHttpClientBuilder.getOkHttpClient(200); //timeout
RequestBody formBody = new FormEncodingBuilder()
.add("platform", HypeApplication.getDeviceType())
.add("function", service)
.add("pdfid",id)
.build();
Request requests = HttpRequestBuilder.getRequest(formBody);
try {
Response response = client.newCall(requests).execute();
inputStream = response.body().byteStream();
File dir = new File(Environment.getExternalStorageDirectory(),"Hype");
if (!dir.mkdirs()) {
Log.e(TAG, "Directory not created");
}
outputStream = new FileOutputStream(new File(dir, filename));
int totalCount = inputStream.available();
byte[] buffer = new byte[1024 * 1024];
int len;
int readLen = 0;
while ((len = inputStream.read(buffer)) != -1 ) {
//System.out.println("download loop " + Thread.currentThread().getName());
outputStream.write(buffer, 0, len);
readLen += len;
}
subscriber.onNext(readLen);
}catch (Exception e){
subscriber.onError(e);
}finally {
try {
if (inputStream != null) {
inputStream.close();
}
if (outputStream != null) {
outputStream.flush();
outputStream.close();
}
} catch (IOException e) {
e.printStackTrace();
}
}
subscriber.onCompleted();
}
});
}
and this is code to start another activity:
Intent intent = new Intent(Intent.ACTION_VIEW);
intent.setDataAndType(FileProvider.getUriForFile(getActivity(),getActivity().getApplicationContext().getPackageName() + ".provider",f)
, "application/pdf");
intent.setFlags(Intent.FLAG_ACTIVITY_NO_HISTORY);
intent.setFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
startActivity(intent);
UPDATE
I tried to use a proxy to intercept http call.
So, I got file from proxy and file generated by my code and I compared them: there are some differences.
I got a simple solution using UrlConnection class.
URL url = new URL(URLSetting.getOldUrl());
HttpURLConnection conn = (HttpURLConnection)url.openConnection();
conn.setReadTimeout(10000);
conn.setConnectTimeout(15000);
conn.setRequestMethod("POST");
conn.setDoInput(true);
conn.setDoOutput(true);
conn.setRequestProperty("appversion","2.0.0");
conn.setRequestProperty("Content-Type",
"application/x-www-form-urlencoded");
Uri.Builder builder = new Uri.Builder()
.appendQueryParameter("platform", HypeApplication.getDeviceType())
.appendQueryParameter("function", service)
.appendQueryParameter("deviceid",HypeApplication.getDeviceId())
.appendQueryParameter("pdfid", id);
OutputStream os = conn.getOutputStream();
BufferedWriter writer = new BufferedWriter(
new OutputStreamWriter(os, "UTF-8"));
writer.write(builder.build().getEncodedQuery());
writer.flush();
writer.close();
os.close();
conn.connect();
inputStream = conn.getInputStream();
So, do you know if okHttp set as default encoding UTF-8?

I'm not sure what exactly is causing your problem, but you could try simplifying your code by using Okio API.
BufferedSource source = response.body().source();
Sink out = Okio.sink(outputFile);
try {
while (!source.exhausted()) {
Buffer buffer = source.buffer();
out.write(buffer, buffer.size());
}
} finally {
out.close();
}
See if that changes anything.

Android Base64 Audio File Encode and Decode

What I am doing: I am currently recording voice and saving it as a file in SDCard which is running / playing fine in MediaPlayer.
What I want: When I encode this file intoBase64 and send to server, everything goes fine. But When i decode the Base64 String into audio.m4a file, it is not running in MediaPlayer.
I had tried .m4a , .wav but all in vain.
The problem is in encoding. Because when I decode a file sent from the same iOS app, it runs fine in MediaPlayer.
I know its very basic and alot of help is there to encode decode but nothing is working. Following is my approach:
private void encodeAudio(String selectedPath) {
byte[] audioBytes;
try {
// Just to check file size.. Its is correct i-e; Not Zero
File audioFile = new File(selectedPath);
long fileSize = audioFile.length();
ByteArrayOutputStream baos = new ByteArrayOutputStream();
FileInputStream fis = new FileInputStream(new File(selectedPath));
byte[] buf = new byte[1024];
int n;
while (-1 != (n = fis.read(buf)))
baos.write(buf, 0, n);
audioBytes = baos.toByteArray();
// Here goes the Base64 string
_audioBase64 = Base64.encodeToString(audioBytes, Base64.DEFAULT);
} catch (Exception e) {
DiagnosticHelper.writeException(e);
}
}
And Decoding in the following way:
private void decodeAudio(String base64AudioData, File fileName, String path, MediaPlayer mp) {
try {
FileOutputStream fos = new FileOutputStream(fileName);
fos.write(Base64.decode(base64AudioData.getBytes(), Base64.DEFAULT));
fos.close();
try {
mp = new MediaPlayer();
mp.setDataSource(path);
mp.prepare();
mp.start();
} catch (Exception e) {
DiagnosticHelper.writeException(e);
}
} catch (Exception e) {
e.printStackTrace();
}
}
Please point if I am doing anything wrong/silly.

try to use Multipartentity to upload any type of file to server.
public void postFile(String file_path, String url){
File file = new File(file_path);
try {
System.out.println(file_path);
HttpClient client = new DefaultHttpClient();
HttpPost post = new HttpPost(url);
FileBody bin = new FileBody(file);
MultipartEntity reqEntity = new MultipartEntity(HttpMultipartMode.BROWSER_COMPATIBLE);
reqEntity.addPart("file", bin); /*I believe that the "file" is the name in php part*/
post.setEntity(reqEntity);
HttpResponse response = client.execute(post);
HttpEntity resEntity = response.getEntity();
if (resEntity != null) {
Log.i("RESPONSE", EntityUtils.toString(resEntity));
}
} catch (Exception e) {
e.printStackTrace();
}
}

Video recording from a textureview running mediaplayer

I am creating an android application which is running a mediaplayer on a textureview, and streaming video from the internet. Now, I want to record the same streaming video to a .mp4 file(or in any format) to SD card. how can I do it?
I cannot use a surfaceview instead of textureview. please help me.

I got a solution. If the server supports downloading use the following code.
private final int TIMEOUT_CONNECTION = 5000; //5sec
private final int TIMEOUT_SOCKET = 30000; //30sec
private final int BUFFER_SIZE = 1024 * 5; // 5MB
try {
URL url = new URL("http://....");
//Open a connection to that URL.
URLConnection ucon = url.openConnection();
ucon.setReadTimeout(TIMEOUT_CONNECTION);
ucon.setConnectTimeout(TIMEOUT_SOCKET);
// Define InputStreams to read from the URLConnection.
// uses 5KB download buffer
InputStream is = ucon.getInputStream();
BufferedInputStream in = new BufferedInputStream(is, BUFFER_SIZE);
FileOutputStream out = new FileOutputStream(file);
byte[] buff = new byte[BUFFER_SIZE];
int len = 0;
while ((len = in.read(buff)) != -1)
{
out.write(buff,0,len);
}
} catch (IOException ioe) {
// Handle the error
} finally {
if(in != null) {
try {
in.close();
} catch (Exception e) {
// Nothing you can do
}
}
if(out != null) {
try {
out.flush();
out.close();
} catch (Exception e) {
// Nothing you can do
}
}
}
it will help.thanks

Android / Java: HttpURLConnection doesn't return headers of redirected file (e.g. on S3)

My code (reproduced below), connects to a url and downloads the file to disk on android. All standard stuff. When I try using this code on a file on S3 accessed via a subdomain on our server mapped to a bucket (e.g. foo.example.com => bucket called foo.example.com), it often fails. Turns out (using the handy curl command..
"curl -v -L -X GET http://foo.example.com/f/a.txt")
.. that there's a redirect going on here.
The file download works ok, as HttpURLConnection will follow redirects by default, but the calls that require the header infomation (getContentLength, getHeaderFieldDate("Last-Modified", 0 ) etc) are returns the headers from the 307 redirect, and not the actual file thats downloaded.
Anyone know how to get around this?
Thanks
File local = null;
try {
Log.i(TAG, "Downloading file " + source);
conn = (HttpURLConnection) new URL(source).openConnection();
fileSize = conn.getContentLength(); // ** THIS IS WRONG ON REDIRECTED FILES
out = new BufferedOutputStream(new FileOutputStream(destination, false), 8 * 1024);
conn.connect();
stream = new BufferedInputStream(conn.getInputStream(), 8 * 1024);
byte[] buffer = new byte[MAX_BUFFER_SIZE];
while (true) {
int read = stream.read(buffer);
if (read == -1) {
break;
}
// writing to buffer
out.write(buffer, 0, read);
downloaded += read;
publishProgress(downloaded, fileSize);
if (isCancelled()) {
return "The user cancelled the download";
}
}
} catch (Exception e) {
String msg = "Failed to download file " + source + ". " + e.getMessage();
Log.e(TAG, msg );
return msg;
} finally {
if (out != null) {
try {
out.flush();
out.close();
} catch (IOException e) {
Log.e(TAG, "Failed to close file " + destination);
e.printStackTrace();
}
}
if (stream != null) {
try {
stream.close();
} catch (IOException e) {
Log.e(TAG, "Failed to close file " + destination);
e.printStackTrace();
}
} else {
long dateLong = conn.getHeaderFieldDate("Last-Modified", 0 ); // ** THIS IS WRONG ON REDIRECTED FILES
Date d = new Date(dateLong);
local.setLastModified(dateLong);
}

have you tried to set redirects to false and try to manually capture the redirected URL and associated header fields with it?
For example something like this:
URL url = new URL(url);
HttpURLConnection ucon = (HttpURLConnection) url.openConnection();
ucon.setInstanceFollowRedirects(false);
URL secondURL = new URL(ucon.getHeaderField("Location"));
URLConnection conn = secondURL.openConnection();
This example captures the redirected URL, but you could easily tweak this to try for any other header field. Does this help?

Consider using httpclient-android. You should get the right headers after redirection with this:
HttpClient client = HttpClientBuilder.create().build();
HttpGet request = new HttpGet(YOUR_URL);
HttpResponse response = client.execute(request);
response.getAllHeaders()
Note that android comes with an older version of httpclient, but it has the same problem as you reported. You actually need to import "httpclient-android" for a newer version.
Note: The code snippet is for v4.3. For other versions, look for how to do it in regular apache HttpClient.

Well, I've been playing a bit and this code, which uses the HttpClient library rather than HttpUrlConnection works fine. The headers it returns are those of the final redirect hop.
At least on the devices I've tested it on.
HttpClient client = null;
HttpGet get = null;
HttpResponse response = null;
try {
client = new DefaultHttpClient();
get = new HttpGet(source);
response = client.execute(get);
Header contentSize = response.getFirstHeader("Content-Length");
if (contentSize != null) {
String value = contentSize.getValue();
fileSize = Long.parseLong(value);
}
if (fileSize == -1) {
Log.e(TAG, "Failed to read the content length for the file " + source);
}
Header lastModified = response.getFirstHeader("Last-Modified");
lastModifiedDate = null;
if (lastModified != null) {
lastModifiedDate = DateUtils.parseDate(lastModified.getValue());
}
if (lastModifiedDate == null) {
Log.e(TAG, "Failed to read the last modified date for the file " + source);
}
out = new BufferedOutputStream(new FileOutputStream(destination, false), 8 * 1024); // false means don't append
stream = new BufferedInputStream(response.getEntity().getContent(), 8 * 1024);
byte[] buffer = new byte[MAX_BUFFER_SIZE];
int count = 0;
while (true) {
int read = stream.read(buffer);
if (read == -1) {
break;
}
// writing to buffer
out.write(buffer, 0, read);
downloaded += read;
publishProgress(downloaded, fileSize);
if (isCancelled()) {
Log.w(TAG, "User Cancelled");
return; // NOTE that onPostExecute is not called here..
}
}// end of while
publishProgress(downloaded, fileSize);
} catch (Exception e) {
String msg = "Failed to download file " + source + ". " + e.getMessage();
Log.e(TAG, msg );
return msg;
} finally {
if (out != null) {
try {
out.flush();
out.close();
} catch (IOException e) {
Log.e(TAG, "Failed to close file " + destination);
e.printStackTrace();
}
}
if (stream != null) {
try {
stream.close();
} catch (IOException e) {
Log.e(TAG, "Failed to close file " + destination);
e.printStackTrace();
}
}
}