Android：如何从音频文件中获取音频细节

Question

我的音乐应用程序从外部应用程序启动，使用意图数据作为音乐文件。

所以我有这样的 mp3 音频 URI

file:///storage/emulated/0/Music/Tamil/I%20(2014)/Ennodu%20Nee%20Irundhaal.mp3

如何从 URI 获取音频详细信息，即 Media.TITLE、Media.ALBUM、Media._ID

Answer 1

MediaMetaDataRetriever类： - android中的MediaMetaDataRetriever类具有许多有利于音频文件的功能。 它的包名是“android.media.MediaMetadataRetriever”它能够提供这样的文件的预定义信息，如：

• 歌曲的艺术家
• 歌曲的专辑名称
• 专辑歌曲艺术
• 歌曲的流派

• 歌曲的作曲家和它有更多的选择。

   MediaMetadataRetriever metaRetriver; metaRetriver = new MediaMetadataRetriever(); metaRetriver.setDataSource("/sdcard/audio.mp3"); 

  上面的代码表示如何创建MediaMetadataRetriever类的对象以及如何设置数据源。

如此代码音频文件的绝对路径，它是sd-card中的文件集。

byte[] art;
art = metaRetriver.getEmbeddedPicture();

以上代码用于从音频文件中以字节格式获取专辑封面。

Bitmap songImage = BitmapFactory.decodeByteArray(art, 0, art.length);

上面的代码用于将字节形式的元数据转换为位图格式，因此可以很容易地在定义显示它的ImageView上进行设置。

所有代码

ImageView album_art;
TextView album, artist, genre;

MediaMetadataRetriever metaRetriver;
byte[] art;

@Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    getInit();

    // Ablum_art retrieval code //

    metaRetriver = new MediaMetadataRetriever();
    metaRetriver.setDataSource("/sdcard/audio.mp3");
    try {
        art = metaRetriver.getEmbeddedPicture();
        Bitmap songImage = BitmapFactory
                .decodeByteArray(art, 0, art.length);
        album_art.setImageBitmap(songImage);
        album.setText(metaRetriver
                .extractMetadata(MediaMetadataRetriever.METADATA_KEY_ALBUM));
        artist.setText(metaRetriver
                .extractMetadata(MediaMetadataRetriever.METADATA_KEY_ARTIST));
        genre.setText(metaRetriver
                .extractMetadata(MediaMetadataRetriever.METADATA_KEY_GENRE));
    } catch (Exception e) {
        album_art.setBackgroundColor(Color.GRAY);
        album.setText("Unknown Album");
        artist.setText("Unknown Artist");
        genre.setText("Unknown Genre");
    }

}

// Fetch Id's form xml 

public void getInit() {

    album_art = (ImageView) findViewById(R.id.album_art);
    album = (TextView) findViewById(R.id.Album);
    artist = (TextView) findViewById(R.id.artist_name);
    genre = (TextView) findViewById(R.id.genre);

}

main.xml中

<? xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >

<TextView
    android:id="@+id/album_art_text"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_marginLeft="20dp"
    android:layout_marginTop="60dp"
    android:text="Album Art"
    android:textSize="18dp" />

<ImageView
    android:id="@+id/album_art"
    android:layout_width="150dp"
    android:layout_height="150dp"
    android:layout_alignParentRight="true"
    android:layout_centerHorizontal="true"
    android:layout_marginRight="10dp" />

<TextView
    android:id="@+id/album_name_text"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignLeft="@+id/album_art_text"
    android:layout_below="@+id/album_art"
    android:layout_marginTop="24dp"
    android:text="Album Name :"
    android:textSize="18dp" />

<TextView
    android:id="@+id/artist_name_text"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignLeft="@+id/album_name_text"
    android:layout_below="@+id/album_name_text"
    android:layout_marginTop="43dp"
    android:text="Artist Name :"
    android:textSize="18dp" />

<TextView
    android:id="@+id/genre_text"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignLeft="@+id/artist_name_text"
    android:layout_below="@+id/artist_name_text"
    android:layout_marginTop="39dp"
    android:text="Genre :"
    android:textSize="18dp" />

<TextView
    android:id="@+id/genre"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignBaseline="@+id/genre_text"
    android:layout_alignBottom="@+id/genre_text"
    android:layout_toRightOf="@+id/album_art_text"
    android:text="null"
    android:textSize="18dp" />


<TextView
    android:id="@+id/Album"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_above="@+id/artist_name_text"
    android:layout_alignLeft="@+id/album_art"
    android:text="null"
    android:textSize="18dp" />

<TextView
    android:id="@+id/artist_name"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_above="@+id/genre_text"
    android:layout_alignLeft="@+id/Album"
    android:text="null"
    android:textSize="18dp" />

</RelativeLayout>

Answer 2

您可以将文件URI转换为规范路径，并使用ContentsProvider获取音乐文件的信息，如下面的代码。

String path = new File(new URI(path).getPath()).getCanonicalPath();
Cursor c = context.getContentResolver().query(
    MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,
    new String[] {
            MediaStore.Audio.Media.ALBUM,
            MediaStore.Audio.Media.ARTIST,
            MediaStore.Audio.Media.TRACK,
            MediaStore.Audio.Media.TITLE,
            MediaStore.Audio.Media.DISPLAY_NAME,
            MediaStore.Audio.Media.DATA,
            MediaStore.Audio.Media.DURATION,
            MediaStore.Audio.Media.YEAR
    },
    MediaStore.Audio.Media.DATA + " = ?",
    new String[] {
            path
    },
    "");

if (null == c) {
    // ERROR
}

while (c.moveToNext()) {
    c.getString(c.getColumnIndex(MediaStore.Audio.Media.ALBUM));
    c.getString(c.getColumnIndex(MediaStore.Audio.Media.ARTIST));
    c.getString(c.getColumnIndex(MediaStore.Audio.Media.TRACK));
    c.getString(c.getColumnIndex(MediaStore.Audio.Media.TITLE));
    c.getString(c.getColumnIndex(MediaStore.Audio.Media.DISPLAY_NAME));
    c.getString(c.getColumnIndex(MediaStore.Audio.Media.DATA));
    c.getString(c.getColumnIndex(MediaStore.Audio.Media.DURATION));
    c.getString(c.getColumnIndex(MediaStore.Audio.Media.YEAR));
}

Answer 3

您可以使用此代码获取音频文件的详细信息：

String path = file:///storage/emulated/0/Music/Tamil/I%20(2014)/Ennodu%20Nee%20Irundhaal.mp3
String where = String.format("%s='%s'", MediaStore.Audio.Media.DATA, path);
Uri uri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
    Cursor cursor = mContext.getContentResolver().query(uri, audioProjection, where, null, null);

    cursor.moveToFirst();
    if (cursor.getCount() > 0) {
        mAudioFile.setId(cursor.getInt(cursor.getColumnIndex(MediaStore.Audio.Media._ID)));
        mAudioFile.setData(cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DATA)));
        mAudioFile.setDisplay_name(cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DISPLAY_NAME)));
        mAudioFile.setSize(cursor.getInt(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.SIZE)));
        mAudioFile.setMime_type(cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.MIME_TYPE)));
        mAudioFile.setTitle(cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.TITLE)));
        mAudioFile.setDuration(cursor.getInt(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DURATION)));
        mAudioFile.setArtist_id(cursor.getInt(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.ARTIST_ID)));
        mAudioFile.setComposer(cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.COMPOSER)));
        mAudioFile.setAlbum_id(cursor.getInt(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.ALBUM_ID)));
        mAudioFile.setTrack(cursor.getInt(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.TRACK)));
        mAudioFile.setYear(cursor.getInt(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.YEAR)));
        mAudioFile.setArtist(cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.ARTIST)));
        mAudioFile.setAlbum(cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.ALBUM)));
    }

Answer 4

public ScopedSong getSongDetails(String path) {
    Uri uri = MediaStore.Audio.Media.getContentUriForPath(path);
    String[] projection = new String[] {
            "title",
            "_id",
            "album",
            "album_id",
            "artist",
            "artist_id",
            "duration",
            "track"
    };
    @SuppressLint("Recycle")
    Cursor cursor = context.getContentResolver().query(uri, projection, null, null, null);
    ScopedSong song = null;
    if (cursor != null && cursor.moveToFirst()) {
        song = new ScopedSong(cursor.getString(0), cursor.getLong(1), cursor.getString(2), cursor.getLong(3),
                cursor.getString(4), cursor.getLong(5), cursor.getInt(6), cursor.getInt(7));
        cursor.close();
    }
    return song;
}


public class ScopedSong {
private final String title, albumName, artistName;
private final long id, albumId, artistId;
private final int duration, trackNumber;

public ScopedSong(String title, long id, String albumName, long albumId, String artistName, long artistId, int duration, int trackNumber) {
    this.title = title;
    this.id = id;
    this.albumName = albumName;
    this.albumId = albumId;
    this.artistName = artistName;
    this.artistId = artistId;
    this.duration = duration;
    this.trackNumber = trackNumber;
}

public ScopedSong() {
    this.title = "";
    this.albumName = "";
    this.artistName = "";
    this.id = -1;
    this.albumId = -1;
    this.artistId = -1;
    this.duration = -1;
    this.trackNumber = -1;
}

public String getTitle() {
    return title;
}

public String getAlbumName() {
    return albumName;
}

public String getArtistName() {
    return artistName;
}

public long getId() {
    return id;
}

public long getAlbumId() {
    return albumId;
}

public long getArtistId() {
    return artistId;
}

public int getDuration() {
    return duration;
}

public int getTrackNumber() {
    return trackNumber;
}

}