Mp3播放器获取艺术家专辑头像、歌手、歌曲信息的方法

最新推荐文章于 2024-12-04 10:30:00 发布

木头剑

最新推荐文章于 2024-12-04 10:30:00 发布

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分类专栏： Android开发文章标签： Android

本文链接：https://blog.youkuaiyun.com/mutoujian126/article/details/39473773

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本文介绍如何在Android应用中解析MP3文件的元数据，包括获取艺术家信息、专辑头像以及详细歌曲信息。通过代码示例展示在Activity页面中操作的步骤和方法。

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在Activity页面代码如下：

// =======获取图片方法
	public static Bitmap getArtwork(Context context, long song_id, long album_id,  
            boolean allowdefault) {  
        if (album_id < 0) {  
            // This is something that is not in the database, so get the album art directly  
            // from the file.  
            if (song_id >= 0) {  
                Bitmap bm = getArtworkFromFile(context, song_id, -1);  
                if (bm != null) {  
                    return bm;  
                }  
            }  
            if (allowdefault) {  
                return getDefaultArtwork(context);  
            }  
            return null;  
        }  
        ContentResolver res = context.getContentResolver();  
        Uri uri = ContentUris.withAppendedId(sArtworkUri, album_id);  
        if (uri != null) {  
            InputStream in = null;  
            try {  
                in = res.openInputStream(uri);  
                return BitmapFactory.decodeStream(in, null, sBitmapOptions);  
            } catch (FileNotFoundException ex) {  
                // The album art thumbnail does not actually exist. Maybe the user deleted it, or  
                // maybe it never existed to begin with.  
                Bitmap bm = getArtworkFromFile(context, song_id, album_id);  
                if (bm != null) {  
                    if (bm.getConfig() == null) {  
                        bm = bm.copy(Bitmap.Config.RGB_565, false);  
                        if (bm == null && allowdefault) {  
                            return getDefaultArtwork(context);  
                        }  
                    }  
                } else if (allowdefault) {  
                    bm = getDefaultArtwork(context);  
                }  
                return bm;  
            } finally {  
                try {  
                    if (in != null) {  
                        in.close();  
                    }  
                } catch (IOException ex) {  
                }  
            }  
        }  
          
        return null;  
    }  
	
	private static Bitmap getArtworkFromFile(Context context, long songid,
			long albumid) {
		Bitmap bm = null;
		byte[] art = null;
		String path = null;
		if (albumid < 0 && songid < 0) {
			throw new IllegalArgumentException(
					"Must specify an album or a song id");
		}
		try {
			if (albumid < 0) {
				Uri uri = Uri.parse("content://media/external/audio/media/"
						+ songid + "/albumart");
				ParcelFileDescriptor pfd = context.getContentResolver()
						.openFileDescriptor(uri, "r");
				if (pfd != null) {
					FileDescriptor fd = pfd.getFileDescriptor();
					bm = BitmapFactory.decodeFileDescriptor(fd);
				}
			} else {
				Uri uri = ContentUris.withAppendedId(sArtworkUri, albumid);
				ParcelFileDescriptor pfd = context.getContentResolver()
						.openFileDescriptor(uri, "r");
				if (pfd != null) {
					FileDescriptor fd = pfd.getFileDescriptor();
					bm = BitmapFactory.decodeFileDescriptor(fd);
				}
			}
		} catch (FileNotFoundException ex) {

		}
		if (bm != null) {
			mCachedBit = bm;
		}
		return bm;
	}

	private static Bitmap getDefaultArtwork(Context context) {
		BitmapFactory.Options opts = new BitmapFactory.Options();
		opts.inPreferredConfig = Bitmap.Config.RGB_565;
		return BitmapFactory.decodeStream(context.getResources()
				.openRawResource(R.drawable.defalt), null, opts);
	}

	private static final Uri sArtworkUri = Uri
			.parse("content://media/external/audio/albumart");
	private static final BitmapFactory.Options sBitmapOptions = new BitmapFactory.Options();
	private static Bitmap mCachedBit = null;
}

在UI页面调用Activity方法：

    public void setImage(){
        myCur = mActivity.getContentResolver().query(  
                MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,  
                new String[] { MediaStore.Audio.Media.TITLE,  
                        MediaStore.Audio.Media.DURATION,  
                        MediaStore.Audio.Media.ARTIST,  
                        MediaStore.Audio.Media._ID,  
                        MediaStore.Audio.Media.ALBUM,  
                        MediaStore.Audio.Media.DISPLAY_NAME,  
                        MediaStore.Audio.Media.DATA,  
                        MediaStore.Audio.Media.ALBUM_ID}, null,null, null);  
        myCur.moveToPosition(listAdapter.getSelectedItem());  //listAdapter.getSelectedItem()是指获取选择列表中某一项Id，通过ID指向某首歌曲。
        
        long songid = myCur.getLong(3);  
        long albumid = myCur.getLong(7);  
        
        Bitmap bm = mActivity.getArtwork(mActivity.getApplicationContext(), songid, albumid,true);  
        if(bm != null){  
            mImageView.setImageBitmap(bm);  
        }else{  
        }  
        
        if(music_artist==null){
        	music_artist.setText(R.string.music_artist);
        }else{
        	music_artist.setText(myCur.getString(2));
        }
        
        if(music_album==null){
        	music_album.setText(R.string.music_album);
        }else{
        	music_album.setText(myCur.getString(4));
        }
    }

在歌曲列表刷新的方法中，调用setImage()方法获取图片。