Develop Reference

MediaPlayer.create() returns null on Android 2.3.7

I'm working on an application which supposed to run on devices from API 8 to latest.
Actually I'm dealing with Mediaplayer. the code is in a fragment and is simply:
MediaPlayer mediaPlayer = null;
if (mediaPlayer = MediaPlayer.create(getActivity(), myAudioFileUri) != null) {
. . .
}
This code perfectly works on Android 4.4.2, MediaPlayer.create() returns a valid value and I can use Mediaplayer without problem.
Unfortunately, MediaPlayer.create() returns null on Android 2.3.7.
this is my problem and I didn't find on Internet a reason why it could cause problem this Android version neither a difference in the way to use it.
Both tests have benn done on GenyMotion emulator as I don't have such an old Android device.
Edit:
So I verified using the shell adb that the problem really comes from mp3 file permissions if I "chmod 777 myfile.mp3", I can succesfully read it.
My problem now is to know how to change permissions on Android 2.3
The code used to download the file from my remote server to copy it locally is the next one:
private Uri downloadFileFromURL(URL url, String fileName) {
try {
URLConnection conn = url.openConnection();
HttpURLConnection httpConnection = conn instanceof HttpURLConnection ? (HttpURLConnection ) conn : null;
int responseCode = httpConnection.getResponseCode();
if (responseCode == HttpURLConnection.HTTP_OK){
int len, length = 0;
byte[] buf = new byte[8192];
InputStream is = httpConnection.getInputStream();
File file = new File(getActivity().getApplicationContext().getFilesDir().getParentFile().getPath(), fileName);
OutputStream os = new FileOutputStream(file);
try {
while((len = is.read(buf, 0, buf.length)) > 0) {
os.write(buf, 0, len);
length += len;
}
os.flush();
}
finally {
is.close();
os.close();
}
String chmodString = "chmod 777 " + getActivity().getApplicationContext().getFilesDir().getParentFile().getPath() +"/" + fileName;
Process sh = Runtime.getRuntime().exec("su", null, new File("/system/bin/"));
OutputStream osChgPerms = sh.getOutputStream();
osChgPerms.write((chmodString).getBytes("ASCII"));
osChgPerms.flush();
osChgPerms.close();
try {
sh.waitFor();
} catch (InterruptedException e) {
Log.d("2ndGuide", "InterruptedException." + e);
}
return Uri.fromFile(file);
}
}
catch(IOException e)
{
Log.d("2ndGuide", "IO Exception." + e);
}
return null;
}
But osChgPerms.write((chmodString).getBytes("ASCII")); generates an IOException: broken pipe.
I suppose I didn't understand how to execute the command.
What's wrong?
Regards,

I can point you 2 possible reasons behind that, not sure whether they can solve your issue.
Android can only allocate a certain amount of MediaPlayer objects, you need to release any MediaPlayer object by using mediaPlayer.release().
Android supports only 8- and 16-bit linear PCM, so check you audio
file. More: Supported Media Formats

So in fact the problem clearly comes from the fact that the media files must be readable for everybody to be readable by the media player.
This behaviour only occurs on pre HONEYCOMB devices.

Could'nt download file on Android while on PC it downloads ok (amazon)

Got an weird issue. A file with Url: https://s3.amazonaws.com/myappdata/msg/171401089927.mp3 (not available any more) downloads ok on PC and its mp3 file. But when I try to DL it on Android FOA Im getting content-type "application/xml" instead of "audio/mpeg" and when downloading starts I'm getting:
05-30 12:13:44.478: E/PlayerService(28023): java.io.FileNotFoundException: https://s3.amazonaws.com/myappdata/msg/171401089927.mp3
05-30 12:13:44.478: E/PlayerService(28023): at libcore.net.http.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:177)
05-30 12:13:44.478: E/PlayerService(28023): at libcore.net.http.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:270)
The code used to DL:
/**
* Download the url stream to a temporary location
*/
public void downloadAudioIncrement(String mediaUrl) throws IOException {
Log.i(TAG, "downloadAudioIncrement(): mediaUrl: "+mediaUrl+"\ncacheDir: "+cacheDir);
URL url = null;
try {
url = new URL(mediaUrl);
} catch (MalformedURLException e) {
e.printStackTrace();
throw new IOException("Unable to create InputStream for mediaUrl:" + mediaUrl);
}
// this file will represent whole downloaded song
mp3FileDownloaded = new File(cacheDir, mp3FileName);
if (!mp3FileDownloaded.exists())
//FileUtils.makeDirsForFile(mp3FileDownloaded);
try{
mp3FileDownloaded.createNewFile();
} catch (IOException e) {
e.printStackTrace();
}
if (!mp3FileDownloaded.canWrite())
throw new IOException("Can't open temporary file for writing");
HttpURLConnection urlConnection = (HttpURLConnection)url.openConnection();
urlConnection.setReadTimeout(1000 * 20);
urlConnection.setConnectTimeout(1000 * 5);
urlConnection.setDoInput(true);
urlConnection.setDoOutput(true);
int mp3BytesSize = urlConnection.getContentLength();
// final String
// contentLengthStr=urlConnection.getHeaderField("content-length");
String ctype = urlConnection.getContentType();
if (ctype == null) {
ctype = "";
} else {
ctype = ctype.toLowerCase(Locale.US);
}
// See if we can handle this type
Log.i(TAG, "Content Type: " + ctype);
if ( ctype.contains("audio/mpeg") || TextUtils.isEmpty(ctype) ) {
String temp = urlConnection.getHeaderField(BITRATE_HEADER);
Log.i(TAG, "Bitrate: " + temp);
// if (temp != null){
// bitrate = new Integer(temp).intValue();
// }
} else {
Log.e(TAG, UNSUPPORTED_AUDIO_TYPE+": " + ctype);
// throw new IOException(UNSUPPORTED_AUDIO_TYPE+": " + ctype);
// Log.e(TAG, "Or we could not connect to audio");
// stop();
// return;
}
final InputStream stream = new BufferedInputStream(urlConnection.getInputStream(),8192);
...
Right at the last shown line of code (instantiating the InputStream stream) the mentioned IOExeption raised. There are other mp3 files exists at same location and they are downloading with no any issue but only mentioned above url fails.What could be wrong here?
UPDATE
Its appears that this issue happens on HTC Rezound with AOS 4.0.4. On other device, with AOS 2.3.5 everything works ok.

seems like the line
urlConnection.setDoOutput(true);
was the source of issue since I don't upload any data. Everything works fine since I'd comment it. Also these FileNotFoundException while getting the InputStream object from HttpURLConnection and Android HttpUrlConnection getInputStream throws NullPointerException threads might be helpfull.

Android download from Azure blob storage results in invalid file

From my Android app I try to download from the windows Azure blob storage using the following URL: http://iclyps.blob.core.windows.net/broadcasts/23_6.mp4
The resulting file is corrupt when I download it from within my app. Same error occurs when I download it using the default Browser or Chrome. Also from the Easy Downloader app, the same error occurs. Only a download from my PC or using Firefox Beta from the Android device (or emulator), the file is retrieved correctly.
I use the following code (snippet):
try {
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
//set up some things on the connection
urlConnection.setRequestMethod("GET");
urlConnection.setDoOutput(true);
//and connect!
urlConnection.connect();
bis = new BufferedInputStream(urlConnection.getInputStream(), BUFSIZE);
bos = new BufferedOutputStream(
context.openFileOutput(TMPFILE, Context.MODE_PRIVATE), BUFSIZE);
/*
* Read bytes to the buffer in chunks of BUFSIZE bytes until there is nothing more to read.
* Each chunk is written to the output file.
*/
byte[] buf = new byte[BUFSIZE];
int nBytes = 0;
int tBytes = 0;
while ((nBytes = bis.read(buf, 0, BUFSIZE)) > 0) {
bos.write(buf, 0, nBytes);
tBytes += nBytes;
}
if (tBytes == 0) throw new Exception("no bytes received");
bos.flush();
MobyLog.d(TAG, "download succeeded: #bytes = " + Integer.toString(tBytes));
return true;
} catch (Exception e) {
MobyLog.e(TAG, "download failed: " + e);
context.deleteFile(TMPFILE); // remove possibly present partial file.
return false;
} finally {
if (bis != null) try { bis.close(); } catch (IOException e) {MobyLog.e(TAG, "bis close exception: " + e); };
if (bos != null) try { bos.close(); } catch (IOException e) {MobyLog.e(TAG, "bos close exception: " + e); };
}
Analyzing the files shows that the first part (about 700K) of the original file is repeated a number of times in the corrupted files, resulting in an invalid mp4 file.
Putting the file on another webserver (Apache/IIS), and downloading the file from that location does result in a correct download.
Has anyone experienced a similar problem performing a download from Azure? Can someone provide a solution?
Cheers,
Harald...

Have you tried using the azure-sdk-for-java in your android app?
Our scenario is slightly different in that we using the sdk to pull and push images from blob storage to a custom android app. But the fundamentals should be the same.

Android ServerSocket programming with jCIFS streaming files

I've got a bit of an issue and I've been asking regarding it quite a few times, but I think I'm one step closer now, so hopefully someone can help me with the rest.
My previous questions:
Connect to NAS device from Android
How to open files in Android with default viewer using jCIFS
Put simply - I want to create an application that:
Can connect to a NAS device using jCIFS
Is capable of launching files in the default viewer - i.e. a video in the video player
The first part is relatively easy and I've already done that, but the second part is what's troubling me and what I've asked about a few times before. I think I've made some progress though.
I think I need to use a ServerSocket in my application to somehow create a bridge between the NAS and the application that's playing the content. I'm thinking this could be done using a Service. The files from the NAS device can be accessed as a FileInputStream.
There are plenty of applications on Market (i.e. ES File Explorer) that are capable of doing this without root access, so I know it's possible - at the moment I just don't know how.
I've been looking at Logcat while using some of the aforementioned applications, and they all seem to be creating a local server and then launch a video Intent from that server. How can this be achieved?

Basic answer is to use SmbFileInputStream to get InputStream You probably use this.
Now the tricky part is how to offer InputStream to other apps.
One possible approach, how many apps provide streaming of any InputStream to other apps on device, is to use http: URL scheme, and tunel your stream over http.
Then apps that can handle http URLs can open and use your data.
For this you have to make some kind of http server, which sounds difficult, but actually is achievable task. Good source to start with is nanohttpd library which is just one java source, originally used to list files in dirs, but you can adapt it to stream your InputStream over http. That's what I did with success.
Your url would look like http:// localhost:12345 where 12345 is port on which your server listens for requests. This port may be obtained from ServerSocket.getLocalPort(). Then give this URL to some app and your server waits for connection and sends data.
A note about http streaming: some apps (e.g. video players) like seekable http streams (http Range header). Since you can get also SmbRandomAccessFile, you can make your tiny server to provide any part of data in file. Android's built-in video player needs such seekable http stream in order to allow seeking in video file, otherwise it gives "Video can't be played" error. Your server must be ready to handle disconnects and multiple connects with different Range values.
Basic tasks of http server:
create ServerSocket
create Thread waiting for connection (Socket accept = serverSocket.accept()), one thread may be ok since you'd handle single client at a time
read http request (socket.getInputStream()), mainly check GET method and Range header)
send headers, mainly Content-Type, Content-Length, Accept-Ranges, Content-Range headers
send actual binary data, which is plain copying of InputStream (file) to OutputStream (socket)
handle disconnects, errors, exceptions
Good luck in implementation.
EDIT:
Here's my class that does the thing. It references some non-present classes for file, which should be trivial for you to replace by your file class.
/**
* This is simple HTTP local server for streaming InputStream to apps which are capable to read data from url.
* Random access input stream is optionally supported, depending if file can be opened in this mode.
*/
public class StreamOverHttp{
private static final boolean debug = false;
private final Browser.FileEntry file;
private final String fileMimeType;
private final ServerSocket serverSocket;
private Thread mainThread;
/**
* Some HTTP response status codes
*/
private static final String
HTTP_BADREQUEST = "400 Bad Request",
HTTP_416 = "416 Range not satisfiable",
HTTP_INTERNALERROR = "500 Internal Server Error";
public StreamOverHttp(Browser.FileEntry f, String forceMimeType) throws IOException{
file = f;
fileMimeType = forceMimeType!=null ? forceMimeType : file.mimeType;
serverSocket = new ServerSocket(0);
mainThread = new Thread(new Runnable(){
#Override
public void run(){
try{
while(true) {
Socket accept = serverSocket.accept();
new HttpSession(accept);
}
}catch(IOException e){
e.printStackTrace();
}
}
});
mainThread.setName("Stream over HTTP");
mainThread.setDaemon(true);
mainThread.start();
}
private class HttpSession implements Runnable{
private boolean canSeek;
private InputStream is;
private final Socket socket;
HttpSession(Socket s){
socket = s;
BrowserUtils.LOGRUN("Stream over localhost: serving request on "+s.getInetAddress());
Thread t = new Thread(this, "Http response");
t.setDaemon(true);
t.start();
}
#Override
public void run(){
try{
openInputStream();
handleResponse(socket);
}catch(IOException e){
e.printStackTrace();
}finally {
if(is!=null) {
try{
is.close();
}catch(IOException e){
e.printStackTrace();
}
}
}
}
private void openInputStream() throws IOException{
// openRandomAccessInputStream must return RandomAccessInputStream if file is ssekable, null otherwise
is = openRandomAccessInputStream(file);
if(is!=null)
canSeek = true;
else
is = openInputStream(file, 0);
}
private void handleResponse(Socket socket){
try{
InputStream inS = socket.getInputStream();
if(inS == null)
return;
byte[] buf = new byte[8192];
int rlen = inS.read(buf, 0, buf.length);
if(rlen <= 0)
return;
// Create a BufferedReader for parsing the header.
ByteArrayInputStream hbis = new ByteArrayInputStream(buf, 0, rlen);
BufferedReader hin = new BufferedReader(new InputStreamReader(hbis));
Properties pre = new Properties();
// Decode the header into params and header java properties
if(!decodeHeader(socket, hin, pre))
return;
String range = pre.getProperty("range");
Properties headers = new Properties();
if(file.fileSize!=-1)
headers.put("Content-Length", String.valueOf(file.fileSize));
headers.put("Accept-Ranges", canSeek ? "bytes" : "none");
int sendCount;
String status;
if(range==null || !canSeek) {
status = "200 OK";
sendCount = (int)file.fileSize;
}else {
if(!range.startsWith("bytes=")){
sendError(socket, HTTP_416, null);
return;
}
if(debug)
BrowserUtils.LOGRUN(range);
range = range.substring(6);
long startFrom = 0, endAt = -1;
int minus = range.indexOf('-');
if(minus > 0){
try{
String startR = range.substring(0, minus);
startFrom = Long.parseLong(startR);
String endR = range.substring(minus + 1);
endAt = Long.parseLong(endR);
}catch(NumberFormatException nfe){
}
}
if(startFrom >= file.fileSize){
sendError(socket, HTTP_416, null);
inS.close();
return;
}
if(endAt < 0)
endAt = file.fileSize - 1;
sendCount = (int)(endAt - startFrom + 1);
if(sendCount < 0)
sendCount = 0;
status = "206 Partial Content";
((RandomAccessInputStream)is).seek(startFrom);
headers.put("Content-Length", "" + sendCount);
String rangeSpec = "bytes " + startFrom + "-" + endAt + "/" + file.fileSize;
headers.put("Content-Range", rangeSpec);
}
sendResponse(socket, status, fileMimeType, headers, is, sendCount, buf, null);
inS.close();
if(debug)
BrowserUtils.LOGRUN("Http stream finished");
}catch(IOException ioe){
if(debug)
ioe.printStackTrace();
try{
sendError(socket, HTTP_INTERNALERROR, "SERVER INTERNAL ERROR: IOException: " + ioe.getMessage());
}catch(Throwable t){
}
}catch(InterruptedException ie){
// thrown by sendError, ignore and exit the thread
if(debug)
ie.printStackTrace();
}
}
private boolean decodeHeader(Socket socket, BufferedReader in, Properties pre) throws InterruptedException{
try{
// Read the request line
String inLine = in.readLine();
if(inLine == null)
return false;
StringTokenizer st = new StringTokenizer(inLine);
if(!st.hasMoreTokens())
sendError(socket, HTTP_BADREQUEST, "Syntax error");
String method = st.nextToken();
if(!method.equals("GET"))
return false;
if(!st.hasMoreTokens())
sendError(socket, HTTP_BADREQUEST, "Missing URI");
while(true) {
String line = in.readLine();
if(line==null)
break;
// if(debug && line.length()>0) BrowserUtils.LOGRUN(line);
int p = line.indexOf(':');
if(p<0)
continue;
final String atr = line.substring(0, p).trim().toLowerCase();
final String val = line.substring(p + 1).trim();
pre.put(atr, val);
}
}catch(IOException ioe){
sendError(socket, HTTP_INTERNALERROR, "SERVER INTERNAL ERROR: IOException: " + ioe.getMessage());
}
return true;
}
}
/**
* #param fileName is display name appended to Uri, not really used (may be null), but client may display it as file name.
* #return Uri where this stream listens and servers.
*/
public Uri getUri(String fileName){
int port = serverSocket.getLocalPort();
String url = "http://localhost:"+port;
if(fileName!=null)
url += '/'+URLEncoder.encode(fileName);
return Uri.parse(url);
}
public void close(){
BrowserUtils.LOGRUN("Closing stream over http");
try{
serverSocket.close();
mainThread.join();
}catch(Exception e){
e.printStackTrace();
}
}
/**
* Returns an error message as a HTTP response and
* throws InterruptedException to stop further request processing.
*/
private static void sendError(Socket socket, String status, String msg) throws InterruptedException{
sendResponse(socket, status, "text/plain", null, null, 0, null, msg);
throw new InterruptedException();
}
private static void copyStream(InputStream in, OutputStream out, byte[] tmpBuf, long maxSize) throws IOException{
while(maxSize>0){
int count = (int)Math.min(maxSize, tmpBuf.length);
count = in.read(tmpBuf, 0, count);
if(count<0)
break;
out.write(tmpBuf, 0, count);
maxSize -= count;
}
}
/**
* Sends given response to the socket, and closes the socket.
*/
private static void sendResponse(Socket socket, String status, String mimeType, Properties header, InputStream isInput, int sendCount, byte[] buf, String errMsg){
try{
OutputStream out = socket.getOutputStream();
PrintWriter pw = new PrintWriter(out);
{
String retLine = "HTTP/1.0 " + status + " \r\n";
pw.print(retLine);
}
if(mimeType!=null) {
String mT = "Content-Type: " + mimeType + "\r\n";
pw.print(mT);
}
if(header != null){
Enumeration<?> e = header.keys();
while(e.hasMoreElements()){
String key = (String)e.nextElement();
String value = header.getProperty(key);
String l = key + ": " + value + "\r\n";
// if(debug) BrowserUtils.LOGRUN(l);
pw.print(l);
}
}
pw.print("\r\n");
pw.flush();
if(isInput!=null)
copyStream(isInput, out, buf, sendCount);
else if(errMsg!=null) {
pw.print(errMsg);
pw.flush();
}
out.flush();
out.close();
}catch(IOException e){
if(debug)
BrowserUtils.LOGRUN(e.getMessage());
}finally {
try{
socket.close();
}catch(Throwable t){
}
}
}
}
/**
* Seekable InputStream.
* Abstract, you must add implementation for your purpose.
*/
abstract class RandomAccessInputStream extends InputStream{
/**
* #return total length of stream (file)
*/
abstract long length();
/**
* Seek within stream for next read-ing.
*/
abstract void seek(long offset) throws IOException;
#Override
public int read() throws IOException{
byte[] b = new byte[1];
read(b);
return b[0]&0xff;
}
}

In Samsung S5 (Android version 5.1.1), I faced a problem of range request starting from a value greater than the file size and I solved it by setting status = "200 OK" as below:
if (startFrom >= contentLength) {
// when you receive a request from MediaPlayer that does not contain Range in the HTTP header , then it is requesting a new stream
// https://code.google.com/p/android/issues/detail?id=3031
status = "200 OK";
}
The remaining headers were left as a fresh request for the stream

Need help debugging my code

I need some input about my code.
Basically, I have a method to load music from Class A
public void onListItemClick(ListView parent, View v, int position, long id){
musicIndex = cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DATA);
cursor.moveToPosition(position);
filePath = cursor.getString(musicIndex);
fileName = new File(filePath).getName();
playMusic();//Play the selected music
}
public void playMusic(){
if(mPlayer.isPlaying()){
mPlayer.reset();
}
try{
mPlayer.setDataSource(filePath);
mPlayer.prepare();
mPlayer.start();
BeatDetection beatDetect = new BeatDetection();
beatDetect.init();
}catch (Exception e){
}
}
That method will call the init() method in Class B
public void init() throws Exception{
energy = 0;
variance = 0;
constant = 0;
isBeat = false;
sensitivity = 0;
dBuffer = new float[sampleRate / bufferSize];
eBuffer = new float[sampleRate / bufferSize];
timer = System.currentTimeMillis();
MusicLoad msc = new MusicLoad();
totalMs = 0;
seeking = true;
//msc.printText();
decode(msc.fileName, 25, 40);
}
In that method, it initializes everything and call the decode() method
public void decode(String path, int startMs, int maxMs)
throws IOException, javazoom.jl.decoder.DecoderException {
debug();
File in = new File(path);
InputStream inStream = new BufferedInputStream(new FileInputStream(in), 8 * 1024);
ByteArrayOutputStream outStream = new ByteArrayOutputStream(1024);
try {
Bitstream bitstream = new Bitstream(inStream);
Decoder decoder = new Decoder();
boolean done = false;
while (! done) {
Header frameHeader = bitstream.readFrame();
if (frameHeader == null) {
done = true;
} else {
totalMs += frameHeader.ms_per_frame();
if (totalMs >= startMs) {
seeking = false;
}
if (! seeking) {
SampleBuffer output = (SampleBuffer) decoder.decodeFrame(frameHeader, bitstream);
if (output.getSampleFrequency() != 44100 || output.getChannelCount() != 2) {
throw new javazoom.jl.decoder.DecoderException("mono or non-44100 MP3 not supported", null);
}
short[] pcm = output.getBuffer();
for (short s : pcm) {
outStream.write(s & 0xff);
outStream.write((s >> 8 ) & 0xff);
}
}
if (totalMs >= (startMs + maxMs)) {
done = true;
}
}
bitstream.closeFrame();
}
byte[] abAudioData = outStream.toByteArray();
calculation(abAudioData);
} catch (BitstreamException e) {
throw new IOException("Bitstream error: " + e);
} catch (DecoderException e) {
Log.w("Decoder error", e);
throw new javazoom.jl.decoder.DecoderException("Error",e);
} finally {
inStream.close();
}
}
Don't mind reading all the code lines. If you guys notice I put debug() in the beginning to see whether the method is called or not. At this point, the debug() is properly called. However, if I put the debug() after the line File in = new File(path);, the debug() will not be called anymore. It seems like the code is stop running at that point.
The ultimate result is, I can load and play the song without any problem. However, the decode() is not called and there is no error whatsoever. I'm stuck at pointing out the problem at this point. So if there's any input please help me.
EDIT: After I tried tracing the "path" variable, it returns NULL so the error is NullPointerException. Seems like the "fileName" variable from Class A is not passed to Class B. Any suggestion?

If you are using Eclipse with ADT then it's very easy to debug your Android apps, just add a breakpoint (probably in the new File(...) line) and see what happens.
My guess here is that File in = new File(path); probably is throwing a IOException in your decode method, that exception is bubbling first to init() and then to playMusic(), where it is caught by try catch block. Your catch is empty so you are not seeing anything. Try debugging as I said or add some logging info in the catch block.

This is just something to look at, but from the doc page
http://developer.android.com/reference/java/io/File.html#File%28java.lang.String%29
"The actual file referenced by a File may or may not exist. It may also, despite the name File, be a directory or other non-regular file."
If you had the path wrong, it may be trying to create the file and you may not have the correct permission to do so. Perhaps: WRITE_EXTERNAL_STORAGE.

I know this post is old, but I just wanted to show how to get the file path to read/write files for others that come across this post as I have:
String filePath = myContext.getFilesDir().getPath().toString() + "/sysout.log";
File file = new File(filePath);
These two lines will create (open if it exists, and overwrite) a file named "sysout.log" in the folder /data/data/com.app.name/files/; myContext is just the current context. Using this technique alleviates problems with defining your own path name. Hope this helps someone.