首先我是一个新手,其次我知道有一个解决方案“如何从 android 的专辑中获取歌曲?” 但那是通过使用游标和MediaStore,我使用了MediametadataRetriever,它完全不同,我没有使用hashmaps等等......所以它变得有点困难......请为此提供任何解决方案???不使用哈希图和媒体存储???
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"));
}
}