DW公版音乐解析

项勇

发布于 2023-03-24 13:40:17

1.5K0

发布于 2023-03-24 13:40:17

文章被收录于专栏：项勇

一.代码位置

https://github.com/itemuse/XTester/tree/master/music-tw

二.效果图

三.流程

3.1 开机底层服务自动扫描硬盘

TWService扫描当机器的硬盘挂载完成后，就可以进行一些指定目录的扫描，Intent.ACTION_MEDIA_MOUNTED是外接设备就绪/插入的广播提示。


            if(new File("/mnt/sdcard").canRead())  sendMedia(Intent.ACTION_MEDIA_MOUNTED,  "file:///mnt/sdcard");
            if(new  File("/storage/extsd0").canRead())  sendMedia(Intent.ACTION_MEDIA_MOUNTED,  "file:///storage/extsd0");
            if(new  File("/storage/extsd1").canRead())  sendMedia(Intent.ACTION_MEDIA_MOUNTED,  "file:///storage/extsd1");
            if(new File("/storage/usb0").canRead())  sendMedia(Intent.ACTION_MEDIA_MOUNTED,  "file:///storage/usb0");
            if(new File("/storage/usb1").canRead())  sendMedia(Intent.ACTION_MEDIA_MOUNTED,  "file:///storage/usb1");
            if(new File("/storage/usb2").canRead())  sendMedia(Intent.ACTION_MEDIA_MOUNTED,  "file:///storage/usb2");

if  (intent.getAction().equals(Intent.ACTION_MEDIA_MOUNTED)) {
             String path =  intent.getData().getPath();
             ...
             new MediaScan().scanMedia(path);

MediaScan

public class MediaScan {
    private final ArrayList<String> video = new  ArrayList<String>();
    private final ArrayList<String> music = new  ArrayList<String>();
    private void scanPath(String volume, String  path) {
         File file = new File(volume + "/" + path);
         if (file.isDirectory()) {
             if (!new File(file,  ".nomedia").exists()) {
                 File[] files = file.listFiles();
                 if(files != null) {
                      boolean isVideo = false;
                      boolean isMusic = false;
                      for (File f : files) {
                          if (f.canRead()) {
                               String n =  f.getName().toUpperCase(Locale.ENGLISH);
                               if  (!n.startsWith(".")) {
                                   if  (f.isDirectory()) {
                                       if(!(n.startsWith("PROGRAM") ||
                                                n.startsWith("SYSTEM") ||
                                                n.startsWith("IGO") ||
                                                n.equals("SYGIC") ||
                                                n.equals("AURA") ||
                                                n.equals("PAPAGO") ||
                                                n.equals("TOMTOM") ||
                                                n.equals("$RECYCLE.BIN") ||
                                                n.equals("WINDOWS") ||
                                                n.equals("BOOT") ||
                                                n.equals("LOST.DIR") ||
                                                n.equals("DCIM") ||
                                                n.contains("NAVI"))) {
                                            scanPath(volume, path + "/" + f.getName());
                                       }
                                   } else {
                                       if (!isVideo)  {
                                            if  (n.endsWith(".AVI") ||
                                                    n.endsWith(".ASF") ||
                                                    n.endsWith(".WMV") ||
                                                    n.endsWith(".M2T") ||
                                                    n.endsWith(".MTS") ||
                                                    n.endsWith(".TS") ||
                                                    n.endsWith(".MPG") ||
                                                    n.endsWith(".M2P") ||
                                                    n.endsWith(".MP4") ||
                                                    n.endsWith(".FLV") ||
                                                    n.endsWith(".SWF") ||
                                                    n.endsWith(".VOB") ||
                                                    n.endsWith(".MKV") ||
                                                    n.endsWith(".DIVX") ||
                                                    n.endsWith(".XVID") ||
                                                    n.endsWith(".MOV") ||
                                                    n.endsWith(".RMVB") ||
                                                    n.endsWith(".RV") ||
                                                    n.endsWith(".3GP") ||
                                                    n.endsWith(".PMP") ||
                                                    n.endsWith(".TP") ||
                                                    n.endsWith(".TRP") ||
                                                    n.endsWith(".RM") ||
                                                    n.endsWith(".WEBM") ||
                                                    n.endsWith(".M2TS") ||
                                                    n.endsWith(".SSIF") ||
                                                    n.endsWith(".MPEG") ||
                                                    n.endsWith(".MPE") ||
                                                    n.endsWith(".M3U8") ||
                                                    n.endsWith(".M4V") ||
                                                    n.endsWith(".3G2") ||
                                                    n.endsWith(".F4V") ||
                                                    n.endsWith(".3GPP")) {
                                                isVideo = true;
                                            }
                                       }
                                       if(!isMusic)  {
                                            if  (n.endsWith(".MP3") ||
                                                    n.endsWith(".WMA") ||
                                                    n.endsWith(".AAC") ||
                                                    n.endsWith(".OGG") ||
                                                    n.endsWith(".PCM") ||
                                                    n.endsWith(".M4A") ||
                                                    n.endsWith(".AC3") ||
                                                    n.endsWith(".EC3") ||
                                                    n.endsWith(".DTSHD") ||
                                                    n.endsWith(".MKA") ||
                                                    n.endsWith(".RA") ||
                                                    n.endsWith(".WAV") ||
                                                    n.endsWith(".CD") ||
                                                    n.endsWith(".AMR") ||
                                                    n.endsWith(".MP2") ||
                                                    n.endsWith(".APE") ||
                                                    n.endsWith(".DTS") ||
                                                    n.endsWith(".FLAC") ||
                                                    n.endsWith(".MIDI") ||
                                                    n.endsWith(".MID") ||
                                                    n.endsWith(".MPC") ||
                                                    n.endsWith(".TTA") ||
                                                    n.endsWith(".ASX") ||
                                                    n.endsWith(".AIFF") ||
                                                    n.endsWith(".AU")) {
                                                isMusic = true;
                                            }
                                       }
                                   }
                               }
                          }
                      }
                      if (isVideo) {
                          video.add(path);
                      }
                      if (isMusic) {
                          Log.i("md", "增加路径   "+path);
                          music.add(path);
                      }
                 }
             }
         }
    }
    
    public void scanMedia(String volume) {
         Log.i("md", "scanMedia   " + volume);
         String path = null;
         video.clear();
         music.clear();
         try {
             scanPath(volume, ".");
             if(volume.startsWith("/storage/usb") ||  volume.startsWith("/storage/extsd")) {
                 path = "/data/tw/" +  volume.substring(9);
             } else {
                 path = volume + "/DCIM";
             }
             new File(path).mkdir();
             FileUtils.setPermissions(path, 0755,  -1, -1);
         } catch (Exception e) {
         }
         try {
             BufferedWriter bw = null;
             try {
                 bw = new BufferedWriter(new  FileWriter(path + "/.video"));
                 for (String v : video) {
                      bw.write(v);
                      bw.write('\n');
                 }
                 bw.flush();
             } catch (Exception e) {
                 new File(path +  "/.video").delete();
             } finally {
                 if(bw != null) {
                      bw.close();
                      bw = null;
                 }
             }
             FileUtils.setPermissions(path +  "/.video", 0666, -1, -1);
         } catch (Exception e) {
         }
         video.clear();
         try {
             BufferedWriter bw = null;
             try {
                 bw = new BufferedWriter(new  FileWriter(path + "/.music"));
                 for (String v : music) {
                      bw.write(v);
                      bw.write('\n');
                 }
                 bw.flush();
             } catch (Exception e) {
                 new File(path +  "/.music").delete();
             } finally {
                 if(bw != null) {
                      bw.close();
                      bw = null;
                 }
             }
             FileUtils.setPermissions(path +  "/.music", 0666, -1, -1);
         } catch (Exception e) {
         }
         music.clear();
    }
}

最终生成的文件是对应音乐视频文件的.Music文件

文件在对应data/tw/对应设备目录，我的设备是usb0

3.2 音乐启动时加载资源目录

MusicActivity启动时候对底层服务生产的.Music文件进行读取

private void initRecord() {
 ...
 mUSBRecord = new Record("USB", 2, 0);
 File[] fileUSB = new  File("/storage").listFiles(new FileFilter() {
         @Override
         public boolean accept(File f) {
             String n = f.getName();
             if(f.canRead() && f.isDirectory()  && n.startsWith("usb")) {
                  return true;
             }
             return false;
         }
 });
 if(fileUSB != null) {
      for(File f : fileUSB) {
           addRecordUSB(f.getAbsolutePath());
      }
 }
 ...
}

有的话进addRecordUSB（路径）,新建一个Record实例对象，通过loadvolume方法扫描后添加到USB的record集合，

private void addRecordUSB(String path) {
        ...
        Record r = new Record(path, 2, 0);
        loadVolume(r, path);
        mUSBRecordArrayList.add(r);
        ...
   }

Record中有保存如下信息

...
String mName  //打开某个目录时，记录的目录名称
int mLevel;  //列表的打开关闭状态 0：显示列表目录状态   1：点击了某个列表后显示“列表+文件目录”的状态
LName[] mLName;  //目录名 目录路径集合  最关键的东西
public int mCLength; //歌曲的数量
...

通过loadVolume解析.music文件，拿到目录名字和目录路径

private void loadVolume(Record record, String  volume) {
 if ((record != null) && (volume != null)) {
      try {
          BufferedReader br = null;
          try {
              String xpath = null;
              if(volume.startsWith("/storage/usb") ||  volume.startsWith("/storage/extsd")) {
                   xpath = "/data/tw/" +  volume.substring(9);
              } else {
                   xpath = volume + "/DCIM";
              }
              br = new BufferedReader(new FileReader(xpath + "/.music"));
              String path = null;
              ArrayList<LName> l = new  ArrayList<LName>();
              while((path = br.readLine()) !=  null) {
                   File f = new File(volume + "/"  + path);
                   if (f.canRead() &&  f.isDirectory()) {
                       String n = f.getName();
                       String p =  f.getAbsolutePath();
                       if(n.equals(".")) {
                           String p2 =  p.substring(0, p.lastIndexOf("/"));
                           String p3 =  p2.substring(p2.lastIndexOf("/") + 1);
                           l.add(new LName(p3,  p));
                       } else {
                            l.add(new LName(n,  p));
                       }
                   }
              }
              record.setLength(l.size());
              for(LName n : l) {
                   record.add(n);
                   Log.i("md", n.mName+"   "+n.mPath+"  ");
              }
              l.clear();
          } catch (Exception e) {
          } finally {
              if(br != null) {
                   br.close();
                   br = null;
              }
          }
         } catch (Exception e) {
         }
 }
}

打印的地方是最终解析出来的文件名+路径

这些都存在于mSDRecordArrayList中，多个外接设备就集合中就有多个Record

3.3 U盘热拔插加载列表逻辑

当设置在运行状态进行U盘热拔插时，底层服务会受到Intent.ACTION_MEDIA_MOUNTED和Intent.ACTION_MEDIA_UNMOUNTED，直接会通知应用。

拔

if (intent.getAction().equals(Intent.ACTION_MEDIA_UNMOUNTED)) {
    			String path = intent.getData().getPath();
    			if(path.equals("/mnt/sdcard")) {
    				mTW.write(0x9e1f, 3, 0);
    			} else if(path.startsWith("/storage/extsd")) {
    				mTW.write(0x9e1f, 1, 0, path.substring(9));
    			} else if(path.startsWith("/storage/usb")) {
    				mTW.write(0x9e1f, 2, 0, path.substring(9));
    			}
    		}

应用中接收处理

case TWMusic.RETURN_MOUNT: {//u盘拔插通知
						String volume = null;
						switch(msg.arg1) {
							case 1:
								volume = "/storage/" + msg.obj;
								if(msg.arg2 == 0) {
									removeRecordSD(volume);
								} else {
									addRecordSD(volume);
								}
								showTRText(R.id.sd);
								break;
							case 2:
								volume = "/storage/" + msg.obj;
								if(msg.arg2 == 0) {
									removeRecordUSB(volume);
								} else {
									addRecordUSB(volume);
								}
								showTRText(R.id.usb);
								break;
							case 3:
								volume = "/mnt/sdcard/iNand";
								if(msg.arg2 == 0) {
									mMediaRecord.clearRecord();
								} else {
									loadVolume(mMediaRecord, volume);
								}
								break;
						}

应用会根据当前拔出的设备名称，对对应的Record集合进行移除，然后更新列表

插 U盘插入的话，底层服务就会继续走自动扫描逻辑，然后扫描完成后通知应用更新读取。

3.4音乐列表显示与点击

每个音乐都至少有一个音乐列表目录，以TW2为例

mPlaylistRecord     
mSDRecordArrayList[position]  
mUSBRecordArrayList[position] 
mMediaRecord

点击对应外接设备类型，列表就会去加载对应的Record,我们程序里是用mCList拉皮条

adapter

private class MyListAdapter extends BaseAdapter {
...
         @Override
         public int getCount() {
             if(mCList == null) {
                 return 0;
             } else if(mCList.mLevel == 0) { //显示的是目录列表状态 如附图1
                 return mCList.mCLength;
             } else {
                 return mCList.mCLength + 1; //显示的是“目录+目录文件”状态，如附图2，音乐多了个目录item，所以长度要+1
             }
         }
...
        private void bindView(View v, int position,  ViewGroup parent) {
             ViewHolder vh = (ViewHolder)  v.getTag();
             String name, path;
             if(mCList.mLevel == 0) { //显示的是目录列表状态时候，name和path老老实实加载
                 name =  mCList.mLName[position].mName;
                 path =  mCList.mLName[position].mPath;
             } else if(position == 0) {//显示的是“目录+目录文件”状态 第一个item显示的是保存的打开目录名称
                 name = mCList.mName;
                 path = null;
             } else {//显示的是“目录+目录文件”状态 name和path的position-1加载
                 name = mCList.mLName[position -  1].mName;
                 path = mCList.mLName[position -  1].mPath;
             }
             vh.line.setText(name);
             ...
         }
        private Context mContext;
    }

附图1：

附图2：

点击列表时发生了什么

mList.setOnItemClickListener(new  OnItemClickListener() {
             @Override
             public void onItemClick(AdapterView<?>  parent, View view,
                      int position, long id) {
                 if((mCList.mLevel != 0) &&  (position == 0)){//附图2状态 点击了第一个item，就是目录名称 ，收回到全目录列表状态
                      mCList = mCList.mPrev;  //加载上一个Record列表
                 } else {
                      if(mCList.mLevel != 0) {
                          position--; 
                      }
                      if((mCList.mLevel == 0) &&  (mCList.mIndex != 0)) {//附图1状态 点击了目录列表 摊开目录的歌曲
                          Record r =  mCList.getNext(position);
                          if(r == null) {
                               r = new  Record(mCList.mLName[position].mName, position,  mCList.mLevel + 1, mCList);
                               mTW.loadFile(r,  mCList.mLName[position].mPath);
                          }
                          mCList.setNext(r);
                          mCList = r;
                      } else {//附图2状态 点击了歌曲 播放
                          mTW.mCurrentIndex =  position;
                          mTW.mCurrentAPath =  mCList.mLName[position].mPath;
                          String path =  mTW.mCurrentAPath.substring(0,  mTW.mCurrentAPath.lastIndexOf("/"));
                          if((path != null) &&  !path.equals(mTW.mCurrentPath)) {
                               if(mCList.mLevel ==  1) {
                                   mTW.mPlaylistRecord.copyLName(mCList);
                               }
                          }
                          mTW.toRPlaylist(position);
                          mTW.mCurrentPath = path;
                          current(0, false);
                      }
                 }
                 mAdapter.notifyDataSetChanged();
             }
         });

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原始发表：2021-07-10，如有侵权请联系 cloudcommunity@tencent.com 删除

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