Improved the music player 2.0 and the music player 2.0

Source: Internet
Author: User

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);    }}
      
     

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