我是 mediastore 的新手。我正在制作一个 android 应用程序，我想知道如何从 mediastore 获取文件路径？或艺术家图像？我之前使用的是 mediametadataretriever 而不是 mediastore，我正在构建自己的数据库，它工作得很好，但它曾经滞后 3 秒，没有人想要那样。下面是与我提出的问题无关的代码，但我发布它只是因为人们习惯于在没有发布代码的情况下投票... package sourcecode.jazzplayer;
import java.io.File;
import java.io.FileFilter;
import java.io.FileOutputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;
import java.util.ArrayList;
import com.nostra13.universalimageloader.core.ImageLoader;
import com.nostra13.universalimageloader.core.ImageLoaderConfiguration;
import sourcecode.jazzplayer.R;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.content.pm.ActivityInfo;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.media.MediaMetadataRetriever;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Environment;
import android.support.v4.app.Fragment;
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.ListView;
public class FragmentSongs extends Fragment implements Serializable{
ListView SngList;
ArrayList<SongDetails> Songinfo=null;
AdapterView.AdapterContextMenuInfo info;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState)
{
ViewGroup view = (ViewGroup) inflater.inflate(R.layout.fragment_song, null);
SngList = (ListView) view.findViewById(R.id.SongList);
registerForContextMenu(SngList);
//File f=new File(Environment.getExternalStorageDirectory()+"/Music");
//File f=new File(Environment.getExternalStorageDirectory()+"/musicz");
File f=new File("/system/");
//File f=new File("/storage/extSdCard/My Music/");
int j=0;int i=0;
getActivity().setRequestedOrientation(ActivityInfo.SCREEN_ORIENTATION_PORTRAIT);
Songinfo = getSongsFromDirectory(f);
//sorting done below
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);
}
}
}
//starting a new activity for playing the music
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;
}
OnFragmentCreatedListener listener;
@Override
public void onStart() {
super.onStart();
try {
listener = (OnFragmentCreatedListener) getActivity();
listener.onFragmentCreated(Songinfo);
} catch (ClassCastException e) {
throw new ClassCastException(getActivity().toString() + " must implement onFragmentCreated");
}
}
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(mmr.extractMetadata(MediaMetadataRetriever.METADATA_KEY_ARTIST));
// if (mmr.extractMetadata(MediaMetadataRetriever.METADATA_KEY_ARTIST)==null||(mmr.extractMetadata(MediaMetadataRetriever.METADATA_KEY_ARTIST)==""))
{ detail.setArtist("Unknow Artist"); }
// detail.setAlbum(mmr.extractMetadata(MediaMetadataRetriever.METADATA_KEY_ALBUM));
// if (mmr.extractMetadata(MediaMetadataRetriever.METADATA_KEY_ALBUM)==null||mmr.extractMetadata(MediaMetadataRetriever.METADATA_KEY_ALBUM)=="")
{ detail.setAlbum("Unknow 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;
}
public interface OnFragmentCreatedListener {
public void onFragmentCreated(ArrayList<SongDetails> msg);
}
}
class Mp3Filter implements FileFilter
{
public boolean accept(File file)
{
return (file.isDirectory()||file.getName().endsWith(".prop")|| file.getName().endsWith(".Mp3")||file.getName().endsWith(".wma")||file.getName().endsWith(".Wma")||file.getName().endsWith(".WMA")||file.getName().endsWith(".mp4"));
}
}