新手android中ListView實現音樂列表

1. main.xml

   <RelativeLayout 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="@android :color/holo_blue_light"
       tools:context="com.example.mymusiclist.MainActivity$PlaceholderFragment" >
   
       <TextView
           android:id="@+id/textView1"
           android:layout_width="match_parent"
           android:layout_height="wrap_content"
           android:gravity="center_horizontal"
           android:textSize="21sp"
           android:text="音樂列表" />
       <ListView
           android:id="@+id/listView1"
           android:layout_width="match_parent"
           android:layout_height="wrap_content"
           android:layout_below="@id/textView1"  
           >
   </ListView>
   </RelativeLayout>

   listview.xml(佈局xml)

   <?xml version="1.0" encoding="utf-8"?>
   <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
       android:layout_width="match_parent"
       android:layout_height="match_parent"
       android:orientation="vertical" >
   
       <TextView
           android:id="@+id/music_title"
           android:layout_width="wrap_content"
           android:layout_height="wrap_content"
           android:layout_marginTop="3dp"
           android:layout_marginLeft="3dp"
           android:layout_weight="1"
           android:text="music_title" />
   
       <LinearLayout
           android:id="@+id/ll1"
           android:layout_width="match_parent"
           android:layout_height="wrap_content"
           android:layout_marginBottom="3dp"
           android:layout_marginTop="3dp"
           android:layout_weight="1"
           android:orientation="horizontal" >
   
           <TextView
               android:id="@+id/music_artist"
               android:layout_width="0dp"
               android:layout_height="wrap_content"
               android:layout_weight="1"
               android:layout_marginLeft="3dp"
               android:text="music_artist" />
   
           <TextView
               android:id="@+id/music_duration"
               android:layout_width="0dp"
               android:layout_height="wrap_content"
               android:layout_weight="1"
               android:gravity="center_horizontal"
               android:text="music_duration" />
       </LinearLayout>
   
   </LinearLayout>

   ---

   
   

2. MainActivity.java

   package com.example.mymusiclist;
   
   
   import java.util.ArrayList;
   import java.util.List;
   
   import android.support.v7.app.ActionBarActivity;
   import android.database.Cursor;
   import android.os.Bundle;
   import android.widget.ListView;
   import android.provider.MediaStore;
   
   public class MainActivity extends ActionBarActivity {
   private ListView listView;
   private ArrayList<MusicMp3> musicList = new ArrayList<MusicMp3>();
       @Override
       protected void onCreate(Bundle savedInstanceState) {
           super.onCreate(savedInstanceState);
           setContentView(R.layout.fragment_main);
           listView = (ListView) findViewById(R.id.listView1);
           musicList = getMp3Infos();
           MusicListAdapter adapter = new MusicListAdapter(this, musicList);
           listView.setAdapter(adapter);
       }
       public ArrayList<MusicMp3> getMp3Infos() {  //獲取音樂列表信息
           Cursor cursor = getContentResolver().query(  
               MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, null, null, null,  
               MediaStore.Audio.Media.DEFAULT_SORT_ORDER);  
           ArrayList<MusicMp3> mp3Infos = new ArrayList<MusicMp3>();  
           for (int i = 0; i < cursor.getCount(); i++) {  
               MusicMp3 mp3Info = new MusicMp3();  
               cursor.moveToNext();  
               long id = cursor.getLong(cursor  
                   .getColumnIndex(MediaStore.Audio.Media._ID));   //音樂id  
               String title = cursor.getString((cursor   
                   .getColumnIndex(MediaStore.Audio.Media.TITLE)));//音樂標題  
               String artist = cursor.getString(cursor  
                   .getColumnIndex(MediaStore.Audio.Media.ARTIST));//藝術家  
               long duration = cursor.getLong(cursor  
                   .getColumnIndex(MediaStore.Audio.Media.DURATION));//時長  
               long size = cursor.getLong(cursor  
                   .getColumnIndex(MediaStore.Audio.Media.SIZE));  //文件大小  
               String url = cursor.getString(cursor  
                   .getColumnIndex(MediaStore.Audio.Media.DATA));              //文件路徑  
           int isMusic = cursor.getInt(cursor  
               .getColumnIndex(MediaStore.Audio.Media.IS_MUSIC));//是否爲音樂  
           if (isMusic != 0) {     //只把音樂添加到集合當中  
               mp3Info.setId(id);  
               mp3Info.setTitle(title);  
               mp3Info.setArtist(artist);  
               mp3Info.setDuration(duration);  
               mp3Info.setSize(size);  
               mp3Info.setUrl(url);  
               mp3Infos.add(mp3Info);  
               }  
           }  
       return mp3Infos;  
       }  
   
   }

   ---

3. MusicListAdapter.java

   package com.example.mymusiclist;
   
   import java.text.SimpleDateFormat;
   import java.util.ArrayList;
   import java.util.Date;
   
   import android.content.Context;
   import android.util.Log;
   import android.view.LayoutInflater;
   import android.view.View;
   import android.view.ViewGroup;
   import android.widget.BaseAdapter;
   import android.widget.TextView;
   
   public class MusicListAdapter extends BaseAdapter {
       private final static String TAG = "MusicListAdapter";
       private LayoutInflater inflater;
       private Context mContext;
       private ArrayList<Mp3Info> mList;
   public MusicListAdapter(Context context, ArrayList<Mp3Info> list){
       mContext = context;
       mList = list;
       inflater = LayoutInflater.from(context);
   }
       @Override
       public int getCount() {
           // TODO Auto-generated method stub
           return mList.size();
       }
   
       @Override
       public Object getItem(int position) {
           // TODO Auto-generated method stub
           return mList.get(position);
       }
   
       @Override
       public long getItemId(int position) {
           // TODO Auto-generated method stub
           return position;
       }
   
       @Override
       public View getView(int position, View convertView, ViewGroup parent) {
           // TODO Auto-generated method stub
           View view;
           if(convertView != null){
               view = convertView;
           } else {
               view = inflater.inflate(R.layout.listview_item, parent, false);
           }
           TextView  title = (TextView)view.findViewById(R.id.music_title);
           TextView artist = (TextView) view.findViewById(R.id.music_artist);
           TextView duration = (TextView) view.findViewById(R.id.music_duration);
           String music_title = mList.get(position).getTitle();
           String music_artist = mList.get(position).getArtist();
           long music_duration = mList.get(position).getDuration();
           title.setText(music_title);
           if(music_artist.equals("<unknown>")){            
               artist.setText("未知藝術家");
           }else{
               artist.setText(music_artist);
           }
           Log.d(TAG, "music_artist============="+music_artist);
           duration.setText(getStringTime(music_duration));
           return view;
       }
   public String getStringTime(long duration){
          SimpleDateFormat sDateFormat = new SimpleDateFormat("mm:ss");
          return sDateFormat.format(new Date(duration));
   }
   }

   ---

   
   

4. 屬性實體MusicMp3.java

   package com.example.mymusiclist;
   
   public class MusicMp3 {
   
   //屬性值，生成get和set方法  構造方法
       long id;
       long duration;
       long size;
       String title;
       String url;
       String artist;
       public MusicMp3(){ }
       
       public MusicMp3(long id, long duration, long size, String title, String url,
               String artist) {
           super();
           this.id = id;
           this.duration = duration;
           this.size = size;
           this.title = title;
           this.url = url;
           this.artist = artist;
       }
   
       public long getId() {
           return id;
       }
       public void setId(long id) {
           this.id = id;
       }
       public long getDuration() {
           return duration;
       }
       public void setDuration(long duration) {
           this.duration = duration;
       }
       public long getSize() {
           return size;
       }
       public void setSize(long size) {
           this.size = size;
       }
       public String getTitle() {
           return title;
       }
       public void setTitle(String title) {
           this.title = title;
       }
       public String getUrl() {
           return url;
       }
       public void setUrl(String url) {
           this.url = url;
       }
       public String getArtist() {
           return artist;
       }
       public void setArtist(String artist) {
           this.artist = artist;
       }
       @Override
       public String toString() {
           return "Mp3Info [id=" + id + ", duration=" + duration + ", size="
                   + size + ", title=" + title + ", url=" + url + ", artist="
                   + artist + "]";
       }
       
       
       
   }