Как отобразить список всех типов MIME, поддерживаемых данным устройством Android?

Question

Я пытаюсь программно отображать поддерживаемый устройством формат. Я нашел это в Интернете. вопрос в том, как отобразить их? пожалуйста, помогите мне, им новичка в разработке Android.

Вот код для проверки формата файла устройства.

package com.android.mmscommon; 

import java.util.ArrayList; 

public class ContentType { 

    public static final String MMS_MESSAGE  = "application/vnd.wap.mms-message"; 
    // The phony content type for generic PDUs (e.g. ReadOrig.ind, 
    // Notification.ind, Delivery.ind). 
    public static final String MMS_GENERIC  = "application/vnd.wap.mms-generic"; 
    public static final String MULTIPART_MIXED = "application/vnd.wap.multipart.mixed"; 
    public static final String MULTIPART_RELATED = "application/vnd.wap.multipart.related"; 
    public static final String MULTIPART_ALTERNATIVE = "application/vnd.wap.multipart.alternative"; 
    public static final String TEXT_PLAIN  = "text/plain"; 
    public static final String TEXT_HTML   = "text/html"; 
    public static final String TEXT_VCALENDAR = "text/x-vCalendar"; 
    public static final String TEXT_VCARD  = "text/x-vCard"; 
    public static final String IMAGE_UNSPECIFIED = "image/*"; 
    public static final String IMAGE_JPEG  = "image/jpeg"; 
    public static final String IMAGE_JPG   = "image/jpg"; 
    public static final String IMAGE_GIF   = "image/gif"; 
    public static final String IMAGE_WBMP  = "image/vnd.wap.wbmp"; 
    public static final String IMAGE_PNG   = "image/png"; 
    public static final String AUDIO_UNSPECIFIED = "audio/*"; 
    public static final String AUDIO_AAC   = "audio/aac"; 
    public static final String AUDIO_AMR   = "audio/amr"; 
    public static final String AUDIO_IMELODY  = "audio/imelody"; 
    public static final String AUDIO_MID   = "audio/mid"; 
    public static final String AUDIO_MIDI  = "audio/midi"; 
    public static final String AUDIO_MP3   = "audio/mp3"; 
    public static final String AUDIO_MPEG3  = "audio/mpeg3"; 
    public static final String AUDIO_MPEG  = "audio/mpeg"; 
    public static final String AUDIO_MPG   = "audio/mpg"; 
    public static final String AUDIO_MP4   = "audio/mp4"; 
    public static final String AUDIO_X_MID  = "audio/x-mid"; 
    public static final String AUDIO_X_MIDI  = "audio/x-midi"; 
    public static final String AUDIO_X_MP3  = "audio/x-mp3"; 
    public static final String AUDIO_X_MPEG3  = "audio/x-mpeg3"; 
    public static final String AUDIO_X_MPEG  = "audio/x-mpeg"; 
    public static final String AUDIO_X_MPG  = "audio/x-mpg"; 
    public static final String AUDIO_3GPP  = "audio/3gpp"; 
    public static final String AUDIO_OGG   = "application/ogg"; 
    public static final String VIDEO_UNSPECIFIED = "video/*"; 
    public static final String VIDEO_3GPP  = "video/3gpp"; 
    public static final String VIDEO_3G2   = "video/3gpp2"; 
    public static final String VIDEO_H263  = "video/h263"; 
    public static final String VIDEO_MP4   = "video/mp4"; 
    public static final String APP_SMIL   = "application/smil"; 
    public static final String APP_WAP_XHTML  = "application/vnd.wap.xhtml+xml"; 
    public static final String APP_XHTML   = "application/xhtml+xml"; 
    public static final String APP_DRM_CONTENT = "application/vnd.oma.drm.content"; 
    public static final String APP_DRM_MESSAGE = "application/vnd.oma.drm.message"; 
    private static final ArrayList<String> sSupportedContentTypes = new ArrayList<String>(); 
    private static final ArrayList<String> sSupportedImageTypes = new ArrayList<String>(); 
    private static final ArrayList<String> sSupportedAudioTypes = new ArrayList<String>(); 
    private static final ArrayList<String> sSupportedVideoTypes = new ArrayList<String>(); 
    static { 
     sSupportedContentTypes.add(TEXT_PLAIN); 
     sSupportedContentTypes.add(TEXT_HTML); 
     sSupportedContentTypes.add(TEXT_VCALENDAR); 
     sSupportedContentTypes.add(TEXT_VCARD); 
     sSupportedContentTypes.add(IMAGE_JPEG); 
     sSupportedContentTypes.add(IMAGE_GIF); 
     sSupportedContentTypes.add(IMAGE_WBMP); 
     sSupportedContentTypes.add(IMAGE_PNG); 
     sSupportedContentTypes.add(IMAGE_JPG); 
     //supportedContentTypes.add(IMAGE_SVG); not yet supported. 
     sSupportedContentTypes.add(AUDIO_AAC); 
     sSupportedContentTypes.add(AUDIO_AMR); 
     sSupportedContentTypes.add(AUDIO_IMELODY); 
     sSupportedContentTypes.add(AUDIO_MID); 
     sSupportedContentTypes.add(AUDIO_MIDI); 
     sSupportedContentTypes.add(AUDIO_MP3); 
     sSupportedContentTypes.add(AUDIO_MPEG3); 
     sSupportedContentTypes.add(AUDIO_MPEG); 
     sSupportedContentTypes.add(AUDIO_MPG); 
     sSupportedContentTypes.add(AUDIO_X_MID); 
     sSupportedContentTypes.add(AUDIO_X_MIDI); 
     sSupportedContentTypes.add(AUDIO_X_MP3); 
     sSupportedContentTypes.add(AUDIO_X_MPEG3); 
     sSupportedContentTypes.add(AUDIO_X_MPEG); 
     sSupportedContentTypes.add(AUDIO_X_MPG); 
     sSupportedContentTypes.add(AUDIO_3GPP); 
     sSupportedContentTypes.add(AUDIO_OGG); 
     sSupportedContentTypes.add(VIDEO_3GPP); 
     sSupportedContentTypes.add(VIDEO_3G2); 
     sSupportedContentTypes.add(VIDEO_H263); 
     sSupportedContentTypes.add(VIDEO_MP4); 
     sSupportedContentTypes.add(APP_SMIL); 
     sSupportedContentTypes.add(APP_WAP_XHTML); 
     sSupportedContentTypes.add(APP_XHTML); 
     sSupportedContentTypes.add(APP_DRM_CONTENT); 
     sSupportedContentTypes.add(APP_DRM_MESSAGE); 
     // add supported image types 
     sSupportedImageTypes.add(IMAGE_JPEG); 
     sSupportedImageTypes.add(IMAGE_GIF); 
     sSupportedImageTypes.add(IMAGE_WBMP); 
     sSupportedImageTypes.add(IMAGE_PNG); 
     sSupportedImageTypes.add(IMAGE_JPG); 
     // add supported audio types 
     sSupportedAudioTypes.add(AUDIO_AAC); 
     sSupportedAudioTypes.add(AUDIO_AMR); 
     sSupportedAudioTypes.add(AUDIO_IMELODY); 
     sSupportedAudioTypes.add(AUDIO_MID); 
     sSupportedAudioTypes.add(AUDIO_MIDI); 
     sSupportedAudioTypes.add(AUDIO_MP3); 
     sSupportedAudioTypes.add(AUDIO_MPEG3); 
     sSupportedAudioTypes.add(AUDIO_MPEG); 
     sSupportedAudioTypes.add(AUDIO_MPG); 
     sSupportedAudioTypes.add(AUDIO_MP4); 
     sSupportedAudioTypes.add(AUDIO_X_MID); 
     sSupportedAudioTypes.add(AUDIO_X_MIDI); 
     sSupportedAudioTypes.add(AUDIO_X_MP3); 
     sSupportedAudioTypes.add(AUDIO_X_MPEG3); 
     sSupportedAudioTypes.add(AUDIO_X_MPEG); 
     sSupportedAudioTypes.add(AUDIO_X_MPG); 
     sSupportedAudioTypes.add(AUDIO_3GPP); 
     sSupportedAudioTypes.add(AUDIO_OGG); 
     // add supported video types 
     sSupportedVideoTypes.add(VIDEO_3GPP); 
     sSupportedVideoTypes.add(VIDEO_3G2); 
     sSupportedVideoTypes.add(VIDEO_H263); 
     sSupportedVideoTypes.add(VIDEO_MP4); 
    } 
    // This class should never be instantiated. 
    private ContentType() { 
    } 
    public static boolean isSupportedType(String contentType) { 
     return (null != contentType) && sSupportedContentTypes.contains(contentType); 
    } 
    public static boolean isSupportedImageType(String contentType) { 
     return isImageType(contentType) && isSupportedType(contentType); 
    } 
    public static boolean isSupportedAudioType(String contentType) { 
     return isAudioType(contentType) && isSupportedType(contentType); 
    } 
    public static boolean isSupportedVideoType(String contentType) { 
     return isVideoType(contentType) && isSupportedType(contentType); 
    } 
    public static boolean isTextType(String contentType) { 
     return (null != contentType) && contentType.startsWith("text/"); 
    } 
    public static boolean isImageType(String contentType) { 
     return (null != contentType) && contentType.startsWith("image/"); 
    } 
    public static boolean isAudioType(String contentType) { 
     return (null != contentType) && contentType.startsWith("audio/"); 
    } 
    public static boolean isVideoType(String contentType) { 
     return (null != contentType) && contentType.startsWith("video/"); 
    } 
    public static boolean isDrmType(String contentType) { 
     return (null != contentType) 
       && (contentType.equals(APP_DRM_CONTENT) 
         || contentType.equals(APP_DRM_MESSAGE)); 
    } 
    public static boolean isUnspecified(String contentType) { 
     return (null != contentType) && contentType.endsWith("*"); 
    } 
    @SuppressWarnings("unchecked") 
    public static ArrayList<String> getImageTypes() { 
     return (ArrayList<String>) sSupportedImageTypes.clone(); 
    } 
    @SuppressWarnings("unchecked") 
    public static ArrayList<String> getAudioTypes() { 
     return (ArrayList<String>) sSupportedAudioTypes.clone(); 
    } 
    @SuppressWarnings("unchecked") 
    public static ArrayList<String> getVideoTypes() { 
     return (ArrayList<String>) sSupportedVideoTypes.clone(); 
    } 
    @SuppressWarnings("unchecked") 
    public static ArrayList<String> getSupportedTypes() { 
     return (ArrayList<String>) sSupportedContentTypes.clone(); 
    } 
} 

Answer 1

Вот полный список: https://www.iana.org/assignments/media-types/media-types.xhtml

Он упоминается в андроиде документации здесь: https://developer.android.com/guide/topics/providers/content-provider-creating.html#MIMETypes

Обратите внимание, что эти типы MIME поддерживаются только если пользователь имеет соответствующее приложение для него. Я не думаю, что вы можете программно отображать поддерживаемые типы MIME. Однако вы можете проверить, поддерживается ли тот, который вы хотите использовать, с использованием кода:

Intent intent = new Intent(Intent.ACTION_VIEW); 
intent.setDataAndType(someUri, "YOUR_MIME_TYPE_HERE"); 
if(intent.resolveActivity(activity.getPackageManager()) != null) 
{ 
    lActivity.startActivity(intent); 
} 
else 
{ 
    Log.w(TAG, "There is no application for this MIME type"); 
}