标签：android hashmap filter android-mediaplayer android-sdcard

我从SD卡中取出歌曲并将他放到列表视图中.

我正在使用这种方法.
但它花了一些时间,如果路径不同,我没有得到这些数据.

所以,
QUE是否有任何有用的脚本显示我所有SD卡中的歌曲.
如果他们进入目录/歌曲.

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 FileExtensionFilter implements FilenameFilter {
        public boolean accept(File dir, String name) {
            return (name.endsWith(".mp3") || name.endsWith(".MP3"));
        }
    }

请对此发表评论.

解决方法:

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>

标签：android,hashmap,filter,android-mediaplayer,android-sdcard
来源： https://codeday.me/bug/20190927/1823423.html

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