Android 获取播放视频的相关 内容, 分辨率, 方向,作者信息

        MediaMetadataRetriever retr = new MediaMetadataRetriever();        retr.setDataSource(videoPath);        String height = retr.extractMetadata(MediaMetadataRetriever.METADATA_KEY_VIDEO_HEIGHT); // 视频高度        String width = retr.extractMetadata(MediaMetadataRetriever.METADATA_KEY_VIDEO_WIDTH); // 视频宽度        String rotation = retr.extractMetadata(MediaMetadataRetriever.METADATA_KEY_VIDEO_ROTATION); // 视频旋转方向

还有 很多的信息 可以获取 

需要注意的时, 获取到的 都是String 类型  需要自己转换成 相应类型 建议转换成 float

应为 即使是整数,转成float 也没有问题   但是小数string  转 int 就有问题而来 

   /**     * The metadata key to retrieve the numeric string describing the     * order of the audio data source on its original recording.     */    public static final int METADATA_KEY_CD_TRACK_NUMBER = 0;    /**     * The metadata key to retrieve the information about the album title     * of the data source.     */    public static final int METADATA_KEY_ALBUM           = 1;    /**     * The metadata key to retrieve the information about the artist of     * the data source.     */    public static final int METADATA_KEY_ARTIST          = 2;    /**     * The metadata key to retrieve the information about the author of     * the data source.     */    public static final int METADATA_KEY_AUTHOR          = 3;    /**     * The metadata key to retrieve the information about the composer of     * the data source.     */    public static final int METADATA_KEY_COMPOSER        = 4;    /**     * The metadata key to retrieve the date when the data source was created     * or modified.     */    public static final int METADATA_KEY_DATE            = 5;    /**     * The metadata key to retrieve the content type or genre of the data     * source.     */    public static final int METADATA_KEY_GENRE           = 6;    /**     * The metadata key to retrieve the data source title.     */    public static final int METADATA_KEY_TITLE           = 7;    /**     * The metadata key to retrieve the year when the data source was created     * or modified.     */    public static final int METADATA_KEY_YEAR            = 8;    /**     * The metadata key to retrieve the playback duration of the data source.     */    public static final int METADATA_KEY_DURATION        = 9;    /**     * The metadata key to retrieve the number of tracks, such as audio, video,     * text, in the data source, such as a mp4 or 3gpp file.     */    public static final int METADATA_KEY_NUM_TRACKS      = 10;    /**     * The metadata key to retrieve the information of the writer (such as     * lyricist) of the data source.     */    public static final int METADATA_KEY_WRITER          = 11;    /**     * The metadata key to retrieve the mime type of the data source. Some     * example mime types include: "video/mp4", "audio/mp4", "audio/amr-wb",     * etc.     */    public static final int METADATA_KEY_MIMETYPE        = 12;    /**     * The metadata key to retrieve the information about the performers or     * artist associated with the data source.     */    public static final int METADATA_KEY_ALBUMARTIST     = 13;    /**     * The metadata key to retrieve the numberic string that describes which     * part of a set the audio data source comes from.     */    public static final int METADATA_KEY_DISC_NUMBER     = 14;    /**     * The metadata key to retrieve the music album compilation status.     */    public static final int METADATA_KEY_COMPILATION     = 15;    /**     * If this key exists the media contains audio content.     */    public static final int METADATA_KEY_HAS_AUDIO       = 16;    /**     * If this key exists the media contains video content.     */    public static final int METADATA_KEY_HAS_VIDEO       = 17;    /**     * If the media contains video, this key retrieves its width.     */    public static final int METADATA_KEY_VIDEO_WIDTH     = 18;    /**     * If the media contains video, this key retrieves its height.     */    public static final int METADATA_KEY_VIDEO_HEIGHT    = 19;    /**     * This key retrieves the average bitrate (in bits/sec), if available.     */    public static final int METADATA_KEY_BITRATE         = 20;    /**     * This key retrieves the language code of text tracks, if available.     * If multiple text tracks present, the return value will look like:     * "eng:chi"     * @hide     */    public static final int METADATA_KEY_TIMED_TEXT_LANGUAGES      = 21;    /**     * If this key exists the media is drm-protected.     * @hide     */    public static final int METADATA_KEY_IS_DRM          = 22;    /**     * This key retrieves the location information, if available.     * The location should be specified according to ISO-6709 standard, under     * a mp4/3gp box "@xyz". Location with longitude of -90 degrees and latitude     * of 180 degrees will be retrieved as "-90.0000+180.0000", for instance.     */    public static final int METADATA_KEY_LOCATION        = 23;    /**     * This key retrieves the video rotation angle in degrees, if available.     * The video rotation angle may be 0, 90, 180, or 270 degrees.     */    public static final int METADATA_KEY_VIDEO_ROTATION = 24;    /**     * This key retrieves the original capture framerate, if it's     * available. The capture framerate will be a floating point     * number.     */    public static final int METADATA_KEY_CAPTURE_FRAMERATE = 25;