how to get all all audio files from sd card android

问题

I want to write a class which gets all the mp3 files from the whole sd card. But actually it only gets the audio files laying directly on the sd card. so it doesnt search trough sub folders.I'd like to use Mediastore but i dont get it to an arraylist. Maybe you can help me, thanks a lot and sorry for beeing a noob ;) vinzenz

import java.io.File;
import java.io.FilenameFilter;
import java.util.ArrayList;
import java.util.HashMap;

import de.me.musicplayer.SongsManager.FileExtensionFilter;

import android.database.Cursor;
import android.net.Uri;
import android.provider.MediaStore;




public class SongsManager {

final String MEDIA_PATH = new String("/sdcard/");
private ArrayList<HashMap<String, String>> songsList = new         ArrayList<HashMap<String, String>>();

// Constructor
public SongsManager(){

}

/**
 * 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;
}

/**
 * Class to filter files which are having .mp3 extension
 * */
class FileExtensionFilter implements FilenameFilter {
    public boolean accept(File dir, String name) {
        return (name.endsWith(".mp3") || name.endsWith(".MP3"));
    }
}
}

回答1:

final String MEDIA_PATH = Environment.getExternalStorageDirectory()
        .getPath() + "/";
private ArrayList<HashMap<String, String>> songsList = new ArrayList<HashMap<String, String>>();
private String mp3Pattern = ".mp3";

// Constructor
public SongsManager() {

}

/**
 * Function to read all mp3 files and store the details in
 * ArrayList
 * */
public ArrayList<HashMap<String, String>> getPlayList() {
    System.out.println(MEDIA_PATH);
    if (MEDIA_PATH != null) {
        File home = new File(MEDIA_PATH);
        File[] listFiles = home.listFiles();
        if (listFiles != null && listFiles.length > 0) {
            for (File file : listFiles) {
                System.out.println(file.getAbsolutePath());
                if (file.isDirectory()) {
                    scanDirectory(file);
                } else {
                    addSongToList(file);
                }
            }
        }
    }
    // return songs list array
    return songsList;
}

private void scanDirectory(File directory) {
    if (directory != null) {
        File[] listFiles = directory.listFiles();
        if (listFiles != null && listFiles.length > 0) {
            for (File file : listFiles) {
                if (file.isDirectory()) {
                    scanDirectory(file);
                } else {
                    addSongToList(file);
                }

            }
        }
    }
}

private void addSongToList(File song) {
    if (song.getName().endsWith(mp3Pattern)) {
        HashMap<String, String> songMap = new HashMap<String, String>();
        songMap.put("songTitle",
                song.getName().substring(0, (song.getName().length() - 4)));
        songMap.put("songPath", song.getPath());

        // Adding each song to SongList
        songsList.add(songMap);
    }
}

回答2:

You can also fetch Using ContentResolver class I have done like this and it's working fine

public void getSongListFromStorage() {
        //retrieve song info
  ContentResolver musicResolver = getContentResolver();
  Uri musicUri = android.provider.MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
  Cursor musicCursor = musicResolver.query(musicUri, null, null, null, null);

  if (musicCursor != null && musicCursor.moveToFirst()) {
  //get columns
  int titleColumn = musicCursor.getColumnIndex
                    (android.provider.MediaStore.Audio.Media.TITLE);
  int idColumn = musicCursor.getColumnIndex
                    (android.provider.MediaStore.Audio.Media._ID);
 int artistColumn = musicCursor.getColumnIndex
                    (android.provider.MediaStore.Audio.Media.ARTIST);
 //add songs to list
  do {
      long thisId = musicCursor.getLong(idColumn);
      String thisTitle = musicCursor.getString(titleColumn);
      String thisArtist = musicCursor.getString(artistColumn);
      songList.add(new Song(thisId, thisTitle, thisArtist));
      } while (musicCursor.moveToNext());
   }
 }

回答3:

This code will give you an arrayList of hash map which content the song title as well as song absolute path

public ArrayList<HashMap<String, String>> getAudioList() {

    ArrayList<HashMap<String, String>> mSongsList = new ArrayList<HashMap<String, String>>();
    Cursor mCursor = getContentResolver().query(
            MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,
            new String[] { MediaStore.Audio.Media.DISPLAY_NAME,
                    MediaStore.Audio.Media.DATA }, null, null, null);

    int count = mCursor.getCount();
    System.out.println("total no of songs are=" + count);
    HashMap<String, String> songMap;
    while (mCursor.moveToNext()) {
        songMap = new HashMap<String, String>();
        songMap.put("songTitle",mCursor.getString(mCursor
                        .getColumnIndexOrThrow(MediaStore.Audio.Media.DISPLAY_NAME)));
        songMap.put("songPath", mCursor.getString(mCursor
                .getColumnIndexOrThrow(MediaStore.Audio.Media.DATA)));
        mSongsList.add(songMap);
    }
    mCursor.close();
    return mSongsList;
}

回答4:

private void getallaudio()
    {
        String[] STAR = { "*" };
        controller.audioWrapper.clear();
        Cursor audioCursor = ((Activity) cntx).managedQuery(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, STAR, null, null, null);
        if (audioCursor != null) 
        {
            if (audioCursor.moveToFirst()) 
            {
                do 
                {
                    String path = audioCursor.getString(audioCursor.getColumnIndex(MediaStore.Audio.Media.DATA));
                    audioWrapper.add(new MediaWrapper(new File(path).getName(), path, "Audio",false));
//                    Log.i("Audio Path",path);
                }while (audioCursor.moveToNext());

            }
//            audioCursor.close();
        }
    }

来源：https://stackoverflow.com/questions/19680563/how-to-get-all-all-audio-files-from-sd-card-android