如何在Flutter中使用id3插入

Question

仅获得每个标签的第一个字母，或者在某处可能是我错了

void info() {
MP3Instance mp3instance = new MP3Instance("/storage/emulated/0/Download/Army_320-(Mr-Jat.in).mp3");
    if(mp3instance.parseTagsSync()){
      print(mp3instance.getMetaTags());
      print(mp3instance.metaTags['Title']);
      print(mp3instance.metaTags['Artist']);
      print(mp3instance.metaTags['Album']);
      print(mp3instance.metaTags['Year']);
      print(mp3instance.metaTags['Genre']);
    }
}

这是输出

I/flutter ( 6995): {Version: v2.3.0, Title: A
I/flutter ( 6995): A
I/flutter ( 6995): S
I/flutter ( 6995): H
I/flutter ( 6995): 2
I/flutter ( 6995): M

仅出现文本的第一个字母和停止位置。

Answer 1

我打印出与mp3instance.getMetaTags()等效的ASCII码，并意识到该字符串中包含一些ASCII control characters，该字符串终止了print()语句。

经过研究后，我使用此方法删除了控制字符：

String normalizeString(String s) {
    var encoded = ascii.encode(s.toString());
    List<int> normalized = new List.from(encoded.map((e) => (e < 32) ? 32 : e));
    return ascii.decode(normalized);
}

我按如下所示打印了规范化的字符串：

 print( "Before normalizing: " + mp3instance.getMetaTags().toString() );
 String normalString = normalizeString( mp3instance.getMetaTags().toString() );
 print( "After normalizing: " + normalString);
 print( "Normalized title: " + mp3instance.metaTags['Title'].toString() );

更多资源：

Replace non ASCII character from string

Another id3 tagging flutter library