请使用此代码来实现此功能。
public class SdCardSongsFragment extends Fragment {
public File file;
private List<String> myList;
private List<String> mycountList;
private ListView listView;
private TextView pathTextView;
private String mediapath = new String(Environment.getExternalStorageDirectory().getAbsolutePath());
String selection =MediaStore.Audio.Media.DATA +" like ?";
String[] projection = {MediaStore.Audio.Media.DATA , MediaStore.Audio.Media.DISPLAY_NAME};
Cursor cursor2;
//your database elect statement
String selection2 = MediaStore.Audio.Media.IS_MUSIC + " != 0";
//your projection statement
String[] projection2= {
MediaStore.Audio.Media._ID,
MediaStore.Audio.Media.ARTIST,
MediaStore.Audio.Media.TITLE,
MediaStore.Audio.Media.DATA,
MediaStore.Audio.Media.DISPLAY_NAME,
MediaStore.Audio.Media.DURATION,
MediaStore.Audio.Media.ALBUM_ID
};
private final static String[] acceptedExtensions= {"mp3", "mp2", "wav", "flac", "ogg", "au" , "snd", "mid", "midi", "kar"
, "mga", "aif", "aiff", "aifc", "m3u", "oga", "spx"};
/** Called when the activity is first created. */
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.activity_sdcrad_song, container, false);
listView=(ListView) rootView.findViewById(R.id.pathlist);
pathTextView=(TextView) rootView.findViewById(R.id.path);
myList = new ArrayList<String>();
mycountList= new ArrayList<String>();
String root_sd = Environment.getExternalStorageDirectory().toString();
Log.e("Root",root_sd);
String state = Environment.getExternalStorageState();
File list[] = null ;
/* if ( Environment.MEDIA_MOUNTED.equals(state) || Environment.MEDIA_MOUNTED_READ_ONLY.equals(state) ) { // we can read the External Storage...
list=getAllFilesOfDir(Environment.getExternalStorageDirectory());
}*/
pathTextView.setText(root_sd);
file = new File( root_sd ) ;
list = file.listFiles(new AudioFilter());
Log.e("Size of list ","" +list.length);
//LoadDirectory(root_sd);
for( int i=0; i< list.length; i++)
{
String name=list[i].getName();
int count = getAudioFileCount(list[i].getAbsolutePath());
Log.e("Count : "+count, list[i].getAbsolutePath());
if(count!=0) {
myList.add(name);
mycountList.add(""+count);
}
}
listView.setAdapter(new SDcardSongListAdapter(getActivity(), myList,mycountList ));
listView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> arg0, View arg1, int position,
long arg3) {
File temp_file = new File( file, myList.get( position ) );
if( !temp_file.isFile())
{
file = new File( file, myList.get( position ));
File list[] = file.listFiles(new AudioFilter());
myList.clear();
mycountList.clear();
for( int i=0; i< list.length; i++)
{
String name=list[i].getName();
int count = getAudioFileCount(list[i].getAbsolutePath());
Log.e("Count : "+count, list[i].getAbsolutePath());
if(count!=0) {
myList.add(name);
mycountList.add(""+count);
}
}
pathTextView.setText( file.toString());
//Toast.makeText(getApplicationContext(), file.toString(), Toast.LENGTH_LONG).show();
listView.setAdapter(new SDcardSongListAdapter(getActivity(), myList,mycountList ));
}
else {
Log.e("Not dirctory ", file.getAbsolutePath());
Cursor cur=getAudioFileCursor(file.getAbsolutePath());
Log.e("Cur count ", ""+cur.getCount());
MusicUtils.playAll(getActivity(), cur,position);
}
}
});
return rootView;
}
private int getAudioFileCount(String dirPath) {
Log.e("Path : ", dirPath);
String[] selectionArgs={dirPath+"%"};
Cursor cursor = getActivity().managedQuery(
MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,
projection2,
selection,
selectionArgs,
null);
cursor2=cursor;
if(cursor!=null)
Log.e("Cur : ", ""+cursor.getCount());
return cursor.getCount();
}
private Cursor getAudioFileCursor(String dirPath) {
String[] selectionArgs={dirPath+"%"};
Cursor cursor = getActivity().managedQuery(
MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,
projection2,
selection,
selectionArgs,
null);
return cursor;
}
public void onBack() {
String parent="";
if(file!=null)
parent = file.getParent().toString();
file = new File( parent ) ;
File list[] = file.listFiles(new AudioFilter());
myList.clear();
mycountList.clear();
for( int i=0; i< list.length; i++)
{
String name=list[i].getName();
int count = getAudioFileCount(list[i].getAbsolutePath());
Log.e("Count : "+count, list[i].getAbsolutePath());
if(count!=0) {
myList.add(name);
mycountList.add(""+count);
}
/*int count=getAllFilesOfDir(list[i]);
Log.e("Songs count ",""+count);
if(count!=0)*/
}
pathTextView.setText(parent);
// Toast.makeText(getApplicationContext(), parent, Toast.LENGTH_LONG).show();
listView.setAdapter(new SDcardSongListAdapter(getActivity(), myList,mycountList ));
}
// class to limit the choices shown when browsing to SD card to media files
public class AudioFilter implements FileFilter {
// only want to see the following audio file types
private String[] extension = {".aac", ".mp3", ".wav", ".ogg", ".midi", ".3gp", ".mp4", ".m4a", ".amr", ".flac"};
@Override
public boolean accept(File pathname) {
// if we are looking at a directory/file that's not hidden we want to see it so return TRUE
if ((pathname.isDirectory() || pathname.isFile()) && !pathname.isHidden()){
return true;
}
// loops through and determines the extension of all files in the directory
// returns TRUE to only show the audio files defined in the String[] extension array
for (String ext : extension) {
if (pathname.getName().toLowerCase().endsWith(ext)) {
return true;
}
}
return false;
}
}
}
XML文件代码：
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/title_songs"
android:orientation="vertical" >
<TextView
android:id="@+id/pathDR"
android:layout_width="fill_parent"
android:layout_height="70dp"
android:layout_marginLeft="10dp"
android:layout_marginTop="10dp"
android:gravity="bottom"
android:text="Directory"
android:textColor="#ffffff"
android:textSize="19sp"
android:typeface="monospace" />
<TextView
android:id="@+id/path"
android:layout_width="fill_parent"
android:layout_height="18dp"
android:layout_marginBottom="10dp"
android:layout_marginLeft="10dp"
android:gravity="bottom"
android:text=""
android:textColor="#ffffff"
android:textSize="12sp"
android:typeface="monospace" />
<View
android:layout_width="fill_parent"
android:layout_height="2dp"
android:background="#ffffff" />
<ListView
android:background="@drawable/bg"
android:id="@+id/pathlist"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
</ListView>
</LinearLayout>