如何在SDCard上找到所有音频文件（eclipse，android）

Question

我已经有了这段代码...但是我也想通过子文件夹搜索而不是只通过sdcard.sorry搜索我的英语;）感谢您的帮助，vinzenz

public class SongsManager {
// SDCard Path
final String MEDIA_PATH = new String("/sdcard/");
private ArrayList<HashMap<String, String>> songsList = new        ArrayList<HashMap<String, String>>();

// Constructor
public SongsManager(){
    **strong text**
 }

/**
 * Function to read all mp3 files from sdcard
 * and store the details in ArrayList
 * */
public ArrayList<HashMap<String, String>> getPlayList(){
    File home = new File(MEDIA_PATH);

    if (home.listFiles(new FileExtensionFilter()).length > 0) {
        for (File file : home.listFiles(new FileExtensionFilter())) {
            HashMap<String, String> song = new HashMap<String, String>();
            song.put("songTitle", file.getName().substring(0, (file.getName().length() - 4)));
            song.put("songPath", file.getPath());

            // Adding each song to SongList
            songsList.add(song);
        }
    }
    // return songs list array
    return songsList;
}

}

Answer 1

此代码可能对您有所帮助。 它在SD卡（甚至在子文件夹中）中搜索歌曲，并将详细信息存储在songsList 。

ArrayList<HashMap<String, String>> songsList = new ArrayList<HashMap<String, String>>();
    String[] STAR = { "*" };

    Cursor cursor;
    Uri uri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
    String selection = MediaStore.Audio.Media.IS_MUSIC + " != 0";


    cursor = managedQuery(uri, STAR, selection, null, null);

    if (cursor != null) {
        if (cursor.moveToFirst()) {
            do {
                String songName = cursor
                        .getString(cursor
                                .getColumnIndex(MediaStore.Audio.Media.DISPLAY_NAME));


                String path = cursor.getString(cursor
                        .getColumnIndex(MediaStore.Audio.Media.DATA));


                String albumName = cursor.getString(cursor
                        .getColumnIndex(MediaStore.Audio.Media.ALBUM));
                int albumId = cursor
                        .getInt(cursor
                                .getColumnIndex(MediaStore.Audio.Media.ALBUM_ID));

                HashMap<String, String> song = new HashMap<String, String>();
                song.put("songTitle",albumName+" "+songName+"___"+albumId);
                song.put("songPath",path );
                songsList.add(song);

            } while (cursor.moveToNext());


        }

    }

Answer 2

考虑到从SD卡扫描媒体，您可以从MediaStore获取此信息

 musiccursor = getContentResolver().query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,
            proj, MediaStore.Audio.Media.MIME_TYPE  + "= audio/mpeg", null, null);

int column_index = musiccursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DATA);


while(musiccursor.moveToNext()){

String path = musiccursor.get(column_index);
//path is your music path, use this
}

Answer 3

你的问题没有直接的解决方案，你必须编写一段代码来遍历目录中的每个文件，如果当前文件是一个目录，则列出该目录的所有文件并再次迭代它的所有文件，依此类推。
类似下面的代码将有助于在这个线程

import java.io.File;

public class DirectoryReader {

  static int spc_count=-1;

  static void process(File aFile) {
    spc_count++;

    if(aFile.isFile()) {
      // your logic to check songs file
    } else if (aFile.isDirectory()) {

      File[] listOfFiles = aFile.listFiles();
      if(listOfFiles!=null) {
        for (int i = 0; i < listOfFiles.length; i++) {
          process(listOfFiles[i]);
        }
      } else {
        // access is denied
      }
    }

    spc_count--;
  }

  public static void main(String[] args) {
    String nam = "/sdcard/";
    File aFile = new File(nam);
    process(aFile);
  }

}