Improved the music player 2.0 and the music player 2.0

Improved the music player 2.0 and the music player 2.0

Compared with the music player 1.0, the 2.0 version has made the following improvements:

Extract the Retrieved Data

Added Music information to the data category class MusicDao.

/*** Music information Data category class * Data Access Object */public class MusicDao {public List
 
  
GetMusicList () {List
  
   
Musics = new ArrayList <> (); if (Environment. getExternalStorageState (). equals (Environment. MEDIA_MOUNTED) {File musicDir = Environment. getExternalStoragePublicDirectory (Environment. DIRECTORY_MUSIC); if (musicDir. exists () {File [] files = musicDir. listFiles (); if (files! = Null & files. length> 0) {String title = ""; for (int I = 0; I
   
    
When loading data
    
MusicDao dao = new MusicDao();musics = dao.getMusicList();
    
Create different packages
    

    
Activity can be placed in Activity or UI package
DAL-> Data Access Layer
Entity-> Entity class
    
Adapter Improvement
    
Add BaseAdapter
    
Public abstract class BaseAdapter
     
      
Extends android. widget. BaseAdapter {private Context context; private List
      
       
Data; private LayoutInflater inflater; public BaseAdapter (Context context, List
       
        
Data) {this. context = context; this. data = data; inflater = LayoutInflater. from (this. context);}/*** get the LayoutInflate object * @ return */protected final LayoutInflater getLayoutInflater () {return inflater;} protected final List
        
         
GetData () {return data;} @ Override public int getCount () {return data. size () ;}@ Override public Object getItem (int I) {return null ;}@ Override public long getItemId (int I) {return 0 ;} @ Override public View getView (int I, View view, ViewGroup viewGroup) {return null ;}}
        
       
      
     
    
Modify MusicAdapter
    
public class MusicAdapter extends BaseAdapter
     
      {    public MusicAdapter(Context context, List
      
        data) {        super(context, data);    }    @Override    public View getView(int i, View view, ViewGroup viewGroup) {        Music music = getData().get(i);        if(view == null){            view = getLayoutInflater().inflate(R.layout.item_music,null);        }        TextView tvTitle = view.findViewById(R.id.tv_music_title);        TextView tvPath = view.findViewById(R.id.tv_music_path);        tvTitle.setText(music.getTitle());        tvPath.setText(music.getPath());        return super.getView(i, view, viewGroup);    }}