Mp3音乐文件列表实现
前一篇博文读取SD卡中所有MP3文件中有说明怎么获取所有Mp3文件的文件名，那是用遍历的方法实现的，但是Android有提供方法去获取音频文件，然后抓取Mp3文件就行了，最后把Mp3文件的一些属性也可以显示出来，我暂时显示了专辑图片（如果有则显示，没有的话显示默认的图片）、音乐名、歌手名，效果图如下：
1.资源管理器预览，主要是3个类文件和2个布局文件：
2.然后就是代码了
①先是布局文件
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" > <ListView android:id="@+id/listView" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_marginTop="10sp" > </ListView> </RelativeLayout>
<?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="wrap_content" android:orientation="horizontal" > <LinearLayout android:layout_width="50sp" android:layout_height="50sp" android:orientation="vertical" android:gravity="center" > <ImageView android:id="@+id/listImage" android:layout_width="40sp" android:layout_height="40sp" /> </LinearLayout> <LinearLayout android:layout_width="match_parent" android:layout_height="50sp" android:orientation="vertical" > <TextView android:id="@+id/listName" android:layout_width="fill_parent" android:layout_height="match_parent" android:layout_weight="1" android:gravity="center_vertical" android:paddingLeft="10dp" android:singleLine="true" android:textSize="16sp" /> <TextView android:id="@+id/list_Singer" android:layout_width="match_parent" android:layout_height="match_parent" android:layout_weight="1" android:gravity="center_vertical" android:paddingLeft="10dp" android:singleLine="true" android:textSize="13sp" /> </LinearLayout> </LinearLayout>
②然后是音乐文件的属性类
package com.yfoliage.getmusiclistmore; /** * @author YFoliage 歌曲信息类 */ public class MusicInfo { private int musicIndex; //排序号 private int musicAlubmId;//专辑ID private String musicName;// 歌曲名 private String musicSinger;// 歌手名 private int musicTime;// 歌曲时间长度 private String musicAlubm;// 专辑名称 private int musicSize;// 曲歌大小 private String musicPath;// 歌曲路径 public int getMusicIndex() { return musicIndex; } public void setMusicIndex(int musicIndex) { this.musicIndex = musicIndex; } public int getMusicId() { return musicAlubmId; } public void setMusicId(int musicAlubmId) { this.musicAlubmId = musicAlubmId; } public String getMusicName() { return musicName; } public void setMusicName(String musicName) { this.musicName = musicName; } public String getMusicSinger() { return musicSinger; } public void setMusicSinger(String musicSinger) { this.musicSinger = musicSinger; } public int getMusicTime() { return musicTime; } public void setMusicTime(int musicTime) { this.musicTime = musicTime; } public String getMusicAlubm() { return musicAlubm; } public void setMusicAlubm(String musicAlubm) { this.musicAlubm = musicAlubm; } public int getMusicSize() { return musicSize; } public void setMusicSize(int musicSize) { this.musicSize = musicSize; } public String getMusicPath() { return musicPath; } public void setMusicPath(String musicPath) { this.musicPath = musicPath; } }
③重写的适配器类
package com.yfoliage.getmusiclistmore; import java.io.FileNotFoundException; import java.io.IOException; import java.util.ArrayList; import java.util.List; import android.content.ContentResolver; import android.content.ContentUris; import android.content.Context; import android.database.Cursor; import android.graphics.Bitmap; import android.graphics.BitmapFactory; import android.net.Uri; import android.provider.MediaStore; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.ImageView; import android.widget.TextView; public class MusicAdapter extends BaseAdapter { // 用来获得ContentProvider(共享数据库) public ContentResolver cr; // 用来装查询到的音乐文件数据 public Cursor cur; // 歌曲信息列表 public List<MusicInfo> musicList; public Context context; public MusicAdapter(Context context) { this.context = context; // 取得数据库对象 cr = context.getContentResolver(); musicList = new ArrayList<MusicInfo>(); String[] mString = new String[] { MediaStore.Audio.Media.DISPLAY_NAME, MediaStore.Audio.Media.ALBUM, MediaStore.Audio.Media.ARTIST, MediaStore.Audio.Media.DURATION, MediaStore.Audio.Media.SIZE, MediaStore.Audio.Media.ALBUM_ID, MediaStore.Audio.Media.DATA }; // 查询所有音乐信息 cur = cr.query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, mString, null, null, null); if (cur != null) { // 移动游标到第一个 cur.moveToFirst(); int j = 1; for (int i = 0; i < cur.getCount(); i++) { if (cur.getString(0).endsWith(".mp3")) {// 过滤获取MP3文件 MusicInfo mInfo = new MusicInfo(); String musicName = cur.getString(0).substring(0, cur.getString(0).lastIndexOf(".mp3")); mInfo.setMusicIndex(j++); mInfo.setMusicName(musicName); mInfo.setMusicAlubm(cur.getString(1)); mInfo.setMusicSinger(cur.getString(2)); mInfo.setMusicTime(cur.getInt(3)); mInfo.setMusicSize(cur.getInt(4)); mInfo.setMusicId(cur.getInt(5)); mInfo.setMusicPath(cur.getString(6)); musicList.add(mInfo); } cur.moveToNext(); } } } @Override public int getCount() { return musicList.size(); } @Override public Object getItem(int arg0) { return musicList.get(arg0); } @Override public long getItemId(int arg0) { return arg0; } @Override public View getView(int arg0, View arg1, ViewGroup arg2) { LayoutInflater mlistLayout = LayoutInflater.from(context); View mlistView = mlistLayout.inflate(R.layout.musiclist, null); TextView songName = (TextView) mlistView.findViewById(R.id.listName); TextView singerName = (TextView) mlistView .findViewById(R.id.list_Singer); ImageView songImage = (ImageView) mlistView .findViewById(R.id.listImage); int mid = musicList.get(arg0).getMusicIndex(); String musicName = musicList.get(arg0).getMusicName(); String musciSinger = musicList.get(arg0).getMusicSinger(); if (musciSinger.contains("<unknown>")) { musciSinger = "<未知>"; } Bitmap img = getAlbumArt(musicList.get(arg0).getMusicId()); songName.setText(mid + ". " + musicName); singerName.setText(musciSinger); songImage.setImageBitmap(img); return mlistView; } /** * 歌曲专辑图片显示,如果有歌曲图片，才会返回，否则为返回默认的图片 * * @param albumId * 专辑地址 * @return 返回类型Bitmap */ public Bitmap getAlbumArt(int albumId) {// albumId是音乐专辑的id Bitmap bitmap = null; Uri sArtworkUri = Uri.parse("content://media/external/audio/albumart"); Uri albumArtUri = ContentUris.withAppendedId(sArtworkUri, albumId); try { bitmap = MediaStore.Images.Media.getBitmap( context.getContentResolver(), albumArtUri); bitmap = Bitmap.createScaledBitmap(bitmap, 30, 30, true); } catch (FileNotFoundException exception) { exception.printStackTrace(); bitmap = BitmapFactory.decodeResource(context.getResources(), R.drawable.album); } catch (IOException e) { e.printStackTrace(); } return bitmap; } }
④最后是Activity
package com.yfoliage.getmusiclistmore; import android.app.Activity; import android.os.Bundle; import android.widget.ListView; public class MainActivity extends Activity { public MusicAdapter mAdapter; private ListView mListView; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); mListView = (ListView) findViewById(R.id.listView); mAdapter = new MusicAdapter(this); mListView.setAdapter(mAdapter); } }
