思路
首先是扫描本地所有的音频文件,然后全部装进集合当中,接下来就是用ListView展示在屏幕上,大概就是这几个步骤了,接下来细讲
创建一个容器
进行过数据解析的朋友都应该知道JavaBean吧,用来装载解析出来的数据,我们这里同样也要创建一个JavaBean,用来装载扫描到的音频文件,具体的代码是:
package com.duanlian.mymusicplayerdemo.bean; /** * Created by user on 2016/6/24. * 放置音乐 */ public class Song { /** * 歌手 */ public String singer; /** * 歌曲名 */ public String song; /** * 歌曲的地址 */ public String path; /** * 歌曲长度 */ public int duration; /** * 歌曲的大小 */ public long size; }
创建一个用来扫描本地音频的工具类
类里面定义一个扫描本地音频的方法,其返回值是一个list集合,集合里面装的泛型就是上一步创建的JavaBean,具体代码如下:
package com.duanlian.mymusicplayerdemo.utils; import android.content.Context; import android.database.Cursor; import android.provider.MediaStore; import com.duanlian.mymusicplayerdemo.bean.song; import java.util.ArrayList; import java.util.List; /** * 音乐工具类,*/ public class MusicUtils { /** * 扫描系统里面的音频文件,返回一个list集合 */ public static List<Song> getMusicData(Context context) { List<Song> list = new ArrayList<Song>(); // 媒体库查询语句(写一个工具类MusicUtils) Cursor cursor = context.getContentResolver().query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,null,MediaStore.Audio.AudioColumns.IS_MUSIC); if (cursor != null) { while (cursor.movetoNext()) { Song song = new Song(); song.song = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.disPLAY_NAME)); song.singer = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.ARTIST)); song.path = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DATA)); song.duration = cursor.getInt(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DURATION)); song.size = cursor.getLong(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.SIZE)); if (song.size > 1000 * 800) { // 注释部分是切割标题,分离出歌曲名和歌手 (本地媒体库读取的歌曲信息不规范) if (song.song.contains("-")) { String[] str = song.song.split("-"); song.singer = str[0]; song.song = str[1]; } list.add(song); } } // 释放资源 cursor.close(); } return list; } /** * 定义一个方法用来格式化获取到的时间 */ public static String formatTime(int time) { if (time / 1000 % 60 < 10) { return time / 1000 / 60 + ":0" + time / 1000 % 60; } else { return time / 1000 / 60 + ":" + time / 1000 % 60; } } }
好了,当我们调用这个类的这个扫描的方法,就可以得到一个里面装有本地音频的的list集合了,但是在这之前还得添加一个权限:让这个程序可以读取手机本地的文件,在AndroidManifest.xlm里面添加权限,具体如下:
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
数据展示
ListView展示数据需要配合Adapter一起使用,而Adapter里面需要传一个上下文,一个数据源,上下文直接能拿到,数据源上面我们已经拿到了,接下来是写ListView和Adapter的编写,先看看MainActivity的布局文件,非常简单:
<?xml version="1.0" encoding="utf-8"?> <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" tools:context="com.duanlian.mymusicplayerdemo.MainActivity"> <TextView android:id="@+id/main_textview" android:layout_width="match_parent" android:layout_height="40dp" android:gravity="center" android:text="我的音乐" /> <ListView android:id="@+id/main_listview" android:layout_below="@+id/main_textview" android:layout_width="match_parent" android:layout_height="match_parent"/> </RelativeLayout>
接下来就是MainActivity里面的编写,具体代码:
package com.duanlian.mymusicplayerdemo; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.widget.ListView; import com.duanlian.mymusicplayerdemo.adapter.MyAdapter; import com.duanlian.mymusicplayerdemo.bean.song; import com.duanlian.mymusicplayerdemo.utils.MusicUtils; import java.util.ArrayList; import java.util.List; public class MainActivity extends AppCompatActivity { private ListView mListView; private List<Song> list; private MyAdapter adapter; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initView(); } /** * 初始化view */ private void initView() { mListView = (ListView) findViewById(R.id.main_listview); list = new ArrayList<>(); //把扫描到的音乐赋值给list list = MusicUtils.getMusicData(this); adapter = new MyAdapter(this,list); mListView.setAdapter(adapter); } } 是不是很简单,就定义一个ListView并且绑定Adapter,接下来就Adapter得编写: [html] view plain copy package com.duanlian.mymusicplayerdemo.adapter; import android.content.Context; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.TextView; import com.duanlian.mymusicplayerdemo.MainActivity; import com.duanlian.mymusicplayerdemo.R; import com.duanlian.mymusicplayerdemo.bean.song; import com.duanlian.mymusicplayerdemo.utils.MusicUtils; import java.util.List; public class MyAdapter extends BaseAdapter { private Context context; private List<Song> list; public MyAdapter(MainActivity mainActivity,List<Song> list) { this.context = mainActivity; this.list = list; } @Override public int getCount() { return list.size(); } @Override public Object getItem(int i) { return list.get(i); } @Override public long getItemId(int i) { return i; } @Override public View getView(int i,View view,ViewGroup viewGroup) { ViewHolder holder = null; if (view == null) { holder = new ViewHolder(); //引入布局 view = View.inflate(context,R.layout.item_music_listview,null); //实例化对象 holder.song = (TextView) view.findViewById(R.id.item_mymusic_song); holder.singer = (TextView) view.findViewById(R.id.item_mymusic_singer); holder.duration = (TextView) view.findViewById(R.id.item_mymusic_duration); holder.position = (TextView) view.findViewById(R.id.item_mymusic_postion); view.setTag(holder); } else { holder = (ViewHolder) view.getTag(); } //给控件赋值 holder.song.setText(list.get(i).song.toString()); holder.singer.setText(list.get(i).singer.toString()); //时间需要转换一下 int duration = list.get(i).duration; String time = MusicUtils.formatTime(duration); holder.duration.setText(time); holder.position.setText(i+1+""); return view; } class ViewHolder{ TextView song;//歌曲名 TextView singer;//歌手 TextView duration;//时长 TextView position;//序号 } }
<?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="110dp" android:orientation="horizontal" android:gravity="center_vertical" android:padding="5dp"> <TextView android:id="@+id/item_mymusic_postion" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_margin="10dp" android:text="1" android:gravity="center" android:textColor="#0d0c0c" android:textSize="18sp" /> <RelativeLayout android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="20dp" > <TextView android:id="@+id/item_mymusic_song" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="歌曲名" android:textColor="#0d0c0c" android:textSize="20dp" /> <TextView android:id="@+id/item_mymusic_singer" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@+id/item_mymusic_song" android:text="歌手" android:textColor="#0d0c0c" android:textSize="15sp" /> <TextView android:id="@+id/item_mymusic_duration" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_below="@+id/item_mymusic_song" android:layout_marginLeft="15dp" android:textColor="#0d0c0c" android:layout_toRightOf="@+id/item_mymusic_singer" android:text="时间" android:textSize="15sp" /> </RelativeLayout> </LinearLayout>
运行效果:
demo下载地址:音乐播放器