如何使用MediametadataRetriever从android中的album/Artist中获取歌曲？

Question

首先,我是一个新手,其次我知道有一个解决方案"如何从Android中的专辑中获取歌曲？" 但这是通过使用游标和MediaStore,我已经使用MediametadataRetriever,它完全不同我没有使用哈希映射和所有.....所以它有点困难....请任何解决方案为此???不使用hashmaps和mediastore ???

这是我用来显示所有歌曲及其艺术家的代码..........

import java.io.File;
import java.io.FileFilter;
import java.io.FilenameFilter;
import java.io.Serializable;
import java.lang.reflect.Array;
import java.util.ArrayList;
import java.util.List;

import android.annotation.SuppressLint;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.media.MediaMetadataRetriever;
import android.media.MediaPlayer;
import android.net.Uri;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.ListFragment;
import android.util.DisplayMetrics;
import android.util.TypedValue;
import android.view.ContextMenu;
import android.view.ContextMenu.ContextMenuInfo;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.AdapterContextMenuInfo;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListView;


public class FragmentSongs extends  Fragment implements Serializable {
    AdapterView.AdapterContextMenuInfo info;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
        Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.fragment_song, container, false);
        ListView SngList = (ListView) view.findViewById(R.id.SongList);
        registerForContextMenu(SngList);
        File f=new File("/sdcard/Music");
        int j=0;int i=0;
        final ArrayList<SongDetails> Songinfo = getSongsFromDirectory(f);

        if (Songinfo.size()>0) {
            for( j=0; j<Songinfo.size();j++) {
                for ( i=j+1 ; i<Songinfo.size(); i++) { 
                    SongDetails a=Songinfo.get(i);
                    SongDetails b=Songinfo.get(j);
                    if (a.getSong().toLowerCase().compareTo(b.getSong().toLowerCase()) < 0) {
                        Songinfo.set(i,b );
                        Songinfo.set(j,a);
                    }
                 }
             }

             SngList.setOnItemClickListener(new OnItemClickListener() { 
                 public void onItemClick(AdapterView a, View v, int position, long id) {
                     Intent intent = new Intent(getActivity(), NowPlaying.class);
                     intent.putParcelableArrayListExtra("Data1",Songinfo);

                     intent.putExtra("Data2",position);
                     startActivity(intent);
                 }
             });

             SngList.setAdapter(new CustomAdapter(Songinfo));
             return view;
         } else {
             return null;
         }
   }

   public ArrayList<SongDetails> getSongsFromDirectory(File f) {
       MediaMetadataRetriever mmr = new MediaMetadataRetriever();
       ArrayList<SongDetails> songs = new ArrayList<SongDetails>();
       Bitmap bitmap2; 
       Bitmap bmp = BitmapFactory.decodeResource(getResources(), R.drawable.ab);

       float ht_px = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 100, getResources().getDisplayMetrics());
       float wt_px = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 100, getResources().getDisplayMetrics());

       Bitmap bitmap3 = Bitmap.createScaledBitmap(bmp, (int) ht_px, (int) wt_px, true);
       byte[] rawArt = null;
       Bitmap art;
       BitmapFactory.Options bfo=new BitmapFactory.Options();
       if (!f.exists() || !f.isDirectory()) {    
           return songs;
       }
       File[] files = f.listFiles(new Mp3Filter());
       for(int i=0; i<files.length; i++) { 
           if (files[i].isFile()) { 
               mmr.setDataSource(files[i].getPath());
               rawArt = mmr.getEmbeddedPicture();
               SongDetails detail=new SongDetails(); 
               if ( rawArt != null) {
                   bitmap2=BitmapFactory.decodeByteArray(rawArt, 0, rawArt.length, bfo);
                   bitmap2 = Bitmap.createScaledBitmap(bitmap2, (int) ht_px, (int) wt_px, true);
                   detail.setIcon(bitmap2);
               } else {  
                   detail.setIcon(bitmap3);
               }

               detail.setSong(files[i].getName()); 
               detail.setArtist(files[i].getName());
               detail.setArtist( mmr.extractMetadata(MediaMetadataRetriever.METADATA_KEY_ARTIST)); 
               detail.setAlbum( mmr.extractMetadata(MediaMetadataRetriever.METADATA_KEY_ALBUM)); 
               detail.setPath2( files[i].getPath()) ;
               songs.add(detail); 
            } else if (files[i].isDirectory()) { 
                songs.addAll(getSongsFromDirectory(files[i])); 
            } 

        }
        return songs;
    }

    @Override
    public void onCreateContextMenu(ContextMenu menu, View v, ContextMenuInfo menuInfo) {
        super.onCreateContextMenu(menu, v, menuInfo);      
        info = (AdapterContextMenuInfo) menuInfo;
        menu.add(Menu.NONE, v.getId(), 0, "Play");
        menu.add(Menu.NONE, v.getId(), 0, "Delete");
        menu.add(Menu.NONE, v.getId(), 0, "Queue Item");                  
    }

    @Override
    public boolean onContextItemSelected(MenuItem item) {
        if (item.getTitle() == "Play") {

        } else if (item.getTitle() == "Delete") {

        } else if (item.getTitle() == "Queue Item") {

        } else {
            return false;
        }
            return true;
    }
}

class Mp3Filter implements FileFilter {
    public boolean accept(File file) {
        return (file.isDirectory()||file.getName().endsWith(".mp3")|| file.getName().endsWith(".Mp3"));
    }
}

Answer 1

看看这个教程:

http://www.srikanthtechnologies.com/blog/android/audioplayer.aspx

您可以稍微修改它以满足您的需求:

private ArrayList<SongDeatils> getSongList(File musicFolder) {
    ArrayList<SongDeatils> songs = new ArrayList<SongDeatils>();

    for (File f : musicFolder.listFiles()) {
        MediaMetadataRetriever md = new MediaMetadataRetriever();
        md.setDataSource(musicFolder + "/" + f.getName());

        // Assign variables like title, artist, etc

        SongDeatils s = new SongDeatils();
        s.setTitle(title);
        s.setArtist(artist);
        s.setSong(f.getPath());
        // ...

        songs.add(s);
    }     

    return songs;
}

对于图像(封面艺术)处理,它应该在适配器中异步完成.我建议使用Universal Image Loader.

更新:

刚刚看到你的评论.您真正想要的是一种有效的方式来列出特定专辑或艺术家的歌曲,而无需使用文件过滤器和排序.那么唯一的另一个选择是使用MediaStore/ Cursor.您可以构建不同类型的查询,具体取决于您尝试查看数据的方式.

因此,要查询艺术家列表,您可以使用MediaStore.Audio.Artists.EXTERNAL_CONTENT_URI艺术家名称作为选择参数.

对于专辑列表,您现在ARTIST_KEY可以使用其查询MediaStore.Audio.Artists.Albums.EXTERNAL_CONTENT_URI,以获取给定艺术家的专辑列表.

有关如何列出给定艺术家的所有专辑的示例,请参阅此处.