Suppose I have a full path of file like:(/sdcard/tlogo.png). I want to know its mime type.

I created a function for it

public static String getMimeType(File file, Context context)    
{
    Uri uri = Uri.fromFile(file);
    ContentResolver cR = context.getContentResolver();
    MimeTypeMap mime = MimeTypeMap.getSingleton();
    String type = mime.getExtensionFromMimeType(cR.getType(uri));
    return type;
}

but when i call it, it returns null.

File file = new File(filePath);
String fileType=CommonFunctions.getMimeType(file, context);

18 Answers 11

up vote 228 down vote accepted

First and foremost, you should consider calling MimeTypeMap#getMimeTypeFromExtension(), like this:

// url = file path or whatever suitable URL you want.
public static String getMimeType(String url) {
    String type = null;
    String extension = MimeTypeMap.getFileExtensionFromUrl(url);
    if (extension != null) {
        type = MimeTypeMap.getSingleton().getMimeTypeFromExtension(extension);
    }
    return type;
}
2 upvote
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thanks work for me and another solution of my problem is : public static String getMimeType(String path, Context context) { String extention = path.substring(path.lastIndexOf(".") ); String mimeTypeMap =MimeTypeMap.getFileExtensionFromUrl(extention); String mimeType = MimeTypeMap.getSingleton() .getMimeTypeFromExtension(mimeTypeMap); return mimeType;} – Sushant Bhatnagar
8 upvote
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And if the file has not the good extension? a person can make a .mp3 and it contains text – throrin19
1 upvote
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Then you'd need to actually open the file & check the magic number (depending on the format ofc) in the lead-in - this, however, also assumes that the person renaming txt-files to mp3 didn't just write ID3 in the beginning of his text to mess with you even more. – Jens
14 upvote
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Warning: MimeTypeMap.getMimeTypeFromExtension("test.flv") returns null. I had to write a wrapper to get correct type for mime type. See grepcode.com/file/repo1.maven.org/maven2/com.google.okhttp/… – Diederik
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Thanks it really helped me ..... – mohitum
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@SushantBhatnagar you comment was helping but it need some improvment because i tried this but not working fine. – umerk44
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@Diederik what about mime type with codec type, for example: video/mp4;codecs="avc1.42001E, mp4a.40.2" (MimeTypeMap.getExtensionFromMimeType()))? YouTube return mime type with codec. I must use "video/mp4;codecs...".split(";",2)[0]. FLV is not registered (mime type starts with x-, in flv: x-flv), so MimeTypeMap for x- return null. en.wikipedia.org/wiki/Internet_media_type#Unregistered_x._tr‌​ee (sorry for my english) – barwnikk
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+1 Nice solution. Thank you very much. You saved my day ;) – Simon
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this is unreliable. It is terrible to depend on file extension and determine filetype from that. I can't believe such an important thing as mentioned by @throrin19 is being ignored. – Ankan-Zerob
1 upvote
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If file has a unknown extension. Do method return */*? – user4400167
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GPX is not recognized either. – Tim Autin
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@TimAutin, method does not work with uppercase. Try modified one: //allinonescript.com/a/39923767/570168 – Lord Flash

The MimeTypeMap solution above returned null in my usage. This works, and is easier:

Uri uri = Uri.fromFile(file);
ContentResolver cR = context.getContentResolver();
String mime = cR.getType(uri);
12 upvote
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This method also can return null. – Mister Smith
1 upvote
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This has worked fine for me when used on local resources. – ban-geoengineering
upvote
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It looks like it can return null or not, according the URI. No body seems to know why ;-( – Thomas Decaux
9 upvote
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If the media is selected from android gallery then TYPE is returned. If selected from File Manager then null is returned. – Rahul Rastogi
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I can positively confirm what Rahul said, just tested it and he is right – Chris
1 upvote
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This method only works for Content Uri. – Kalpesh Patel
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In some devices if i select image from gallery also it is returning null – Ghanshyam Nayma
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@KalpeshPatel said it right, it is mentioned in the documentation as well. – Sarthak Mittal

The above solution returned null in case of .rar file, using URLConnection.guessContentTypeFromName(url) worked in this case.

Here is the solution which I used in my Android app:

public static String getMimeType(String url)
    {
        String extension = url.substring(url.lastIndexOf("."));
        String mimeTypeMap = MimeTypeMap.getFileExtensionFromUrl(extension);
        String mimeType = MimeTypeMap.getSingleton().getMimeTypeFromExtension(mimeTypeMap);
        return mimeType;
    }
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url? A lot of url doesn't have extension. For example this page doesn't have extension. For url you should use new URL(url).openConnection().getRequestProperty("Content-type")‌​; – barwnikk
File file = new File(path, name);

    MimeTypeMap mime = MimeTypeMap.getSingleton();
    int index = file.getName().lastIndexOf('.')+1;
    String ext = file.getName().substring(index).toLowerCase();
    String type = mime.getMimeTypeFromExtension(ext);

    intent.setDataAndType(Uri.fromFile(file), type);
    try
    {
      context.startActivity(intent);
    }
    catch(ActivityNotFoundException ex)
    {
        ex.printStackTrace();

    }
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Works perfect for me! But how about using the FilenameUtils.getExetension(path) to get the file extension? – peterb

Pay super close attention to umerk44 solution above. getMimeTypeFromExtension invokes guessMimeTypeTypeFromExtension and is CASE SENSITIVE. I spent an afternoon on this then took a closer look - getMimeTypeFromExtension will return NULL if you pass it "JPG" whereas it will return "image/jpeg" if you pass it "jpg"

MimeTypeMap may not recognize some file extensions like flv,mpeg,3gpp,cpp. So you need to think how to expand the MimeTypeMap for maintaining your code. Here is such an example.

http://grepcode.com/file/repo1.maven.org/maven2/com.google.okhttp/okhttp/20120626/libcore/net/MimeUtils.java#MimeUtils

Plus, here is a complete list of mime types

http: //www.sitepoint.com/web-foundations/mime-types-complete-list/

Sometimes Jeb's and Jens's answers don't work and return null. In this case I use follow solution. Head of file usually contains type signature. I read it and compare with known in list of signatures.

/**
 *
 * @param is InputStream on start of file. Otherwise signature can not be defined.
 * @return int id of signature or -1, if unknown signature was found. See SIGNATURE_ID_(type) constants to
 *      identify signature by its id.
 * @throws IOException in cases of read errors.
 */
public static int getSignatureIdFromHeader(InputStream is) throws IOException {
    // read signature from head of source and compare with known signatures
    int signatureId = -1;
    int sigCount = SIGNATURES.length;
    int[] byteArray = new int[MAX_SIGNATURE_LENGTH];
    StringBuilder builder = new StringBuilder();
    for (int i = 0; i < MAX_SIGNATURE_LENGTH; i++) {
        byteArray[i] = is.read();
        builder.append(Integer.toHexString(byteArray[i]));
    }
    if (DEBUG) {
        Log.d(TAG, "head bytes=" + builder.toString());
    }
    for (int i = 0; i < MAX_SIGNATURE_LENGTH; i++) {

        // check each bytes with known signatures
        int bytes = byteArray[i];
        int lastSigId = -1;
        int coincidences = 0;

        for (int j = 0; j < sigCount; j++) {
            int[] sig = SIGNATURES[j];

            if (DEBUG) {
                Log.d(TAG, "compare" + i + ": " + Integer.toHexString(bytes) + " with " + sig[i]);
            }
            if (bytes == sig[i]) {
                lastSigId = j;
                coincidences++;
            }
        }

        // signature is unknown
        if (coincidences == 0) {
            break;
        }
        // if first bytes of signature is known we check signature for full coincidence
        if (coincidences == 1) {
            int[] sig = SIGNATURES[lastSigId];
            int sigLength = sig.length;
            boolean isSigKnown = true;
            for (; i < MAX_SIGNATURE_LENGTH && i < sigLength; i++) {
                bytes = byteArray[i];
                if (bytes != sig[i]) {
                    isSigKnown = false;
                    break;
                }
            }
            if (isSigKnown) {
                signatureId = lastSigId;
            }
            break;
        }
    }
    return signatureId;
}

signatureId is an index of signature in array of signatures. For example,

private static final int[] SIGNATURE_PNG = hexStringToIntArray("89504E470D0A1A0A");
private static final int[] SIGNATURE_JPEG = hexStringToIntArray("FFD8FF");
private static final int[] SIGNATURE_GIF = hexStringToIntArray("474946");

public static final int SIGNATURE_ID_JPEG = 0;
public static final int SIGNATURE_ID_PNG = 1;
public static final int SIGNATURE_ID_GIF = 2;
private static final int[][] SIGNATURES = new int[3][];

static {
    SIGNATURES[SIGNATURE_ID_JPEG] = SIGNATURE_JPEG;
    SIGNATURES[SIGNATURE_ID_PNG] = SIGNATURE_PNG;
    SIGNATURES[SIGNATURE_ID_GIF] = SIGNATURE_GIF;
}

Now I have file type even if URI of file haven't. Next I get mime type by file type. If you don't know which mime type to get, you can find proper in this table.

It works for a lot of file types. But for video it doesn't work, because you need to known video codec to get a mime type. To get video's mime type I use MediaMetadataRetriever.

mime from local file:

String url = file.getAbsolutePath();
FileNameMap fileNameMap = URLConnection.getFileNameMap();
String mime = fileNameMap.getContentTypeFor("file://"+url);

Detect mime type of my

public String getMimeType(Uri uri) {
    String mimeType = null;
    if (uri.getScheme().equals(ContentResolver.SCHEME_CONTENT)) {
        ContentResolver cr = getAppContext().getContentResolver();
        mimeType = cr.getType(uri);
    } else {
        String fileExtension = MimeTypeMap.getFileExtensionFromUrl(uri
                .toString());
        mimeType = MimeTypeMap.getSingleton().getMimeTypeFromExtension(
                fileExtension.toLowerCase());
    }
    return mimeType;
}
upvote
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Saved my day. Thanks!!! – neelamc23
upvote
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toLowerCase() works for me – gluix
3 upvote
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This should be the correct answer. toLowerCase() did the trick. – Rajat Saxena

you have multiple choice to get extension of file:like: 1-String filename = uri.getLastPathSegment(); see this link

2-you can use this code also

 filePath .substring(filePath.lastIndexOf(".")+1);

but this not good aproch. 3-if you have URI of file then use this Code

String[] projection = { MediaStore.MediaColumns.DATA,
MediaStore.MediaColumns.MIME_TYPE };

4-if you have URL then use this code:

 public static String getMimeType(String url) {
String type = null;
String extension = MimeTypeMap.getFileExtensionFromUrl(url);
if (extension != null) { 


  type = MimeTypeMap.getSingleton().getMimeTypeFromExtension(extension);
    }

return type;
}

enjoy your code:)

// new processing the mime type out of Uri which may return null in some cases
String mimeType = getContentResolver().getType(uri);
// old processing the mime type out of path using the extension part if new way returned null
if (mimeType == null){mimeType URLConnection.guessContentTypeFromName(path);}
get file object....
File file = new File(filePath);

then....pass as a parameter to...

getMimeType(file);

...here is 


public String getMimeType(File file) {
        String mimetype = MimeTypeMap.getSingleton().getMimeTypeFromExtension(MimeTypeMap.getFileExtensionFromUrl(Uri.fromFile(file).toString()).toLowerCase());
        if (mimetype == null) {
            return "*/*";
        }
        return mimetype;///return the mimeType
    }

While from asset/file(Note that few cases missing from the MimeTypeMap).

private String getMimeType(String path) {
    if (null == path) return "*/*";

    String extension = path;
    int lastDot = extension.lastIndexOf('.');
    if (lastDot != -1) {
        extension = extension.substring(lastDot + 1);
    }

    // Convert the URI string to lower case to ensure compatibility with MimeTypeMap (see CB-2185).
    extension = extension.toLowerCase(Locale.getDefault());
    if (extension.equals("3ga")) {
        return "audio/3gpp";
    } else if (extension.equals("js")) {
        return "text/javascript";
    } else if (extension.equals("woff")) {
        return "application/x-font-woff";
    } else {
        // TODO
        // anyting missing from the map (http://www.sitepoint.com/web-foundations/mime-types-complete-list/)
        // reference: http://grepcode.com/file/repo1.maven.org/maven2/com.google.okhttp/okhttp/20120626/libcore/net/MimeUtils.java#MimeUtils
    }

    return MimeTypeMap.getSingleton().getMimeTypeFromExtension(extension);
}

While use ContentResolver

contentResolver.getType(uri)

While http/https request

    try {
        HttpURLConnection conn = httpClient.open(new URL(uri.toString()));
        conn.setDoInput(false);
        conn.setRequestMethod("HEAD");
        return conn.getHeaderField("Content-Type");
    } catch (IOException e) {
    }

I tryed to use standart methods to determine mime type, but I cannot retain file extension using MimeTypeMap.getFileExtensionFromUrl(uri.getPath()). This method returned me an empty String. So I made non-trivial solution to retain file extention.

Here is method returning file extention

private String getExtention(String fileName){
    char[] arrayOfFilename = fileName.toCharArray();
    for(int i = arrayOfFilename.length-1; i > 0; i--){
        if(arrayOfFilename[i] == '.'){
            return fileName.substring(i+1, fileName.length());
        }
    }
    return "";
}

And having retained file extention it is possible to get mime type like below

public String getMimeType(File file) {
    String mimeType = "";
    String extension = getExtention(file.getName());
    if (MimeTypeMap.getSingleton().hasExtension(extension)) {
        mimeType = MimeTypeMap.getSingleton().getMimeTypeFromExtension(extension);
    }
    return mimeType;
}

Optimized version of Jens' answere with fallback.

@NonNull
static String getMimeType(@NonNull File file) {
    String type = null;
    final String url = file.toString();
    final String extension = MimeTypeMap.getFileExtensionFromUrl(url);
    if (extension != null) {
        type = MimeTypeMap.getSingleton().getMimeTypeFromExtension(extension.toLowerCase());
    }
    if (type == null) {
        type = "image/*"; // fallback type. You might set it to */*
    }
    return type;
}

Important: getFileExtensionFromUrl() only works with lowercase!

For Xamarin Android (From @HoaLe's answer above)

public String getMimeType(Uri uri) {
    String mimeType = null;
    if (uri.Scheme.Equals(ContentResolver.SchemeContent))
    {
        ContentResolver cr = Application.Context.ContentResolver;
        mimeType = cr.GetType(uri);
    }
    else
    {
        String fileExtension = MimeTypeMap.GetFileExtensionFromUrl(uri.ToString());
        mimeType = MimeTypeMap.Singleton.GetMimeTypeFromExtension(
        fileExtension.ToLower());
    }
    return mimeType;
}
public static String getFileType(Uri file)
{
    try
    {
        if (file.getScheme().equals(ContentResolver.SCHEME_CONTENT))
            return subStringFromLastMark(SystemMaster.getContentResolver().getType(file), "/");
        else
            return MimeTypeMap.getFileExtensionFromUrl(file.toString()).toLowerCase();
    }
    catch(Exception e)
    {
        return null;
    }
}

public static String getMimeType(Uri file)
{
    try
    {
        return MimeTypeMap.getSingleton().getMimeTypeFromExtension(getFileType(file));
    }
    catch(Exception e)
    {
        return null;
    }
}

public static String subStringFromLastMark(String str,String mark)
{
    int l = str.lastIndexOf(mark);
    int end = str.length();
    if(l == -1)
        return str;

    return str.substring(l + 1, end);
}

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