目录

• 效果图
• 简介
• Aria
• 导入Aria
• 介绍
• 启动Service
• DownloadService
• 下载回调
• 回调接口
• 单例Binder
• 构造单例
• 下载
• 辐射
• 创建下载实例
• 监听下载状态

效果图

简介

Aria

下载器采用开源框架Aria

github

中文文档

导入Aria

  implementation 'me.laoyuyu.aria:core:3.8.16'

  annotationProcessor 'me.laoyuyu.aria:compiler:3.8.16'

  implementation 'me.laoyuyu.aria:m3u8:3.8.16'

介绍

service在Appliaction中启动，即启动app即启动service并且service只启动一次，后序通过单例binder去调用服务

启动Service

在Application中默认启动Service

复制
private void bindService(){
        DownloadService.bindService(this, new ServiceConnection() {
            @Override
            public void onServiceConnected(ComponentName name, IBinder service) {
            }
            @Override
            public void onServiceDisconnected(ComponentName name) {
                downloadService = null;
            }
        });
    }

DownloadService

用于Aplication调用起服务

复制
public static void bindService(Context context, ServiceConnection connection){
        Intent intent = new Intent(context, DownloadService.class);
        context.bindService(intent, connection, Service.BIND_AUTO_CREATE);
    }

注册下载器

复制
@Override
    public void onCreate() {
        super.onCreate();
        Aria.download(this).register();
        Log.d("DownloadService","create service");
    }

若上次有未下载完成的视频，则恢复下载，并将binder赋给另一个单例binder，后续使用binder进行具体下载事项

复制
@Nullable
    @Override
    public IBinder onBind(Intent intent) {
        Log.d("DownloadService","bind service");
        long taskId = (long)SP.getInstance().GetData(BaseApplication.getContext(),"lastDownloadID",L);
        if (taskId !=L){
            List<DownloadEntity> entityList = Aria.download(this).getAllNotCompleteTask();
            if (entityList != null){
                HttpNormalTarget target = Aria.download(this).load(taskId);
                if (target.getTaskState() != STATE_COMPLETE){
                    target.mu8VodOption(DownloadBinder.getInstance().getOption());
                    target.resume();
                    Log.d("DownloadService","resume download");
                } else {
                    HttpNormalTarget resume =  Aria.download(this).load( entityList.get().getId());
                    resume.mu8VodOption(DownloadBinder.getInstance().getOption());
                    if ((resume.getTaskState() == STATE_FAIL) || (resume.getTaskState() == STATE_OTHER)){
                        resume.resetState();
                        Log.d("DownloadService","resetState");
                    }else {
                        resume.resume();
                        Log.d("DownloadService","resumeState");
                    }
                }
            }
        }
        return DownloadBinder.getInstance();
    }

注销aria下载器和解除binder绑定

复制
 @Override
    public boolean onUnbind(Intent intent) {
        Log.d("DownloadService","unbind service");
        return super.onUnbind(intent);
    }
    @Override
    public void onDestroy() {
        super.onDestroy();
        Aria.download(this).unRegister();
        Log.d("DownloadService","service onDestroy");
    }

下载回调

然后将Aria下载器的回调在进行一次中转，回调至单例binder，后面在下载就不需要binder服务，直接调用单例binder即可

复制
@Download.onNoSupportBreakPoint public void onNoSupportBreakPoint(DownloadTask task) {
    Log.d("DownloadService","该下载链接不支持断点");
   // DownloadBinder.getInstance().onTaskStart(task);
}
@Download.onTaskStart public void onTaskStart(DownloadTask task) {
    Log.d("DownloadService",task.getDownloadEntity().getFileName() +":开始下载");
    DownloadBinder.getInstance().onTaskStart(task);
}
@Download.onTaskStop public void onTaskStop(DownloadTask task) {
    Log.d("DownloadService",task.getDownloadEntity().getFileName() +":停止下载");
    DownloadBinder.getInstance().onTaskStop(task);
}
@Download.onTaskCancel public void onTaskCancel(DownloadTask task) {
    Log.d("DownloadService",task.getDownloadEntity().getFileName() +":取消下载");
    DownloadBinder.getInstance().onTaskCancel(task);
}
@Download.onTaskFail public void onTaskFail(DownloadTask task) {
    Log.d("DownloadService",task.getDownloadEntity().getFileName() +":下载失败");
    DownloadBinder.getInstance().onTaskFail(task);
}
@Download.onTaskComplete public void onTaskComplete(DownloadTask task) {
    Log.d("DownloadService",task.getDownloadEntity().getFileName() +":下载完成");
    DownloadBinder.getInstance().onTaskComplete(task);
}
/**
 * @param e 异常信息
 */
@Download.onTaskFail void taskFail(DownloadTask task, Exception e) {
    try {
        DownloadBinder.getInstance().taskFail(task,e);
        ALog.d("DownloadService", task.getDownloadEntity().getFileName() +"error:"+ALog.getExceptionString(e));
    }catch (Exception ee){
        ee.printStackTrace();
    }
}
@Download.onTaskRunning public void onTaskRunning(DownloadTask task) {
    Log.d("DownloadService","pre = "+task.getPercent()+"   "+"speed = "+ task.getConvertSpeed());
    DownloadBinder.getInstance().onTaskRunning(task);
}
}

回调接口

将服务中的Aria回调，回调至单例binder中

复制
public interface ServiceCallback {
    void onTaskStart(DownloadTask task);
    void onTaskStop(DownloadTask task);
    void onTaskCancel(DownloadTask task);
    void onTaskFail(DownloadTask task);
    void onTaskComplete(DownloadTask task);
    void onTaskRunning(DownloadTask task);
    void taskFail(DownloadTask task, Exception e);
}

单例Binder

构造单例

复制
public class DownloadBinder extends Binder implements ServiceCallback {
 private static DownloadBinder binder;
    private DownloadBinder() {
    }
    public static DownloadBinder getInstance() {
        if (binder == null) {
            binder = new DownloadBinder();
            downloadReceiver = Aria.download(BaseApplication.getContext());
        }
        return binder;
    }

下载

将下载信息传入，并以视频type+id+name等构件下载文件夹名称，确保唯一性，然后通过配置Aria Option，使其切换至m3u8文件下载模式，具体配置文件还可配置下载速度、最大下载文件数量、线程数等等。

Aria自带数据库，可通过其数据库保存一些数据，但读取数据较慢

复制
public void startDownload(DownloadBean downloadBean) {
    if (downloadBean == null) return;
    String locationDir = FileUtils.getInstance().mainCatalogue();
    String name = downloadBean.getVideoType()+downloadBean.gettId() + downloadBean.getsId() + downloadBean.geteId();
    String subFile = FileUtils.getInstance().createFile(locationDir, name);
    String path = subFile + File.separator + name + ".mu8";
    Log.d("DownloadService", "start download");
    boolean isExist = IsExist(path);
    if (isExist) {
        Log.d("DownloadService", "exist same item");
        if (repeatTaskId !=) {
            if (Aria.download(this).load(repeatTaskId).getTaskState() != STATE_RUNNING) {
                if (downloadReceiver.load(repeatTaskId).getEntity().getRealUrl().equals(downloadBean.getVideoUrl())) {
                    downloadReceiver.load(repeatTaskId).mu8VodOption(DownloadBinder.getInstance().getOption());
                    downloadReceiver.load(repeatTaskId).resume();
                } else {
                    downloadReceiver.load(repeatTaskId).mu8VodOption(DownloadBinder.getInstance().getOption());
                    downloadReceiver.load(repeatTaskId).updateUrl(downloadBean.getVideoUrl()).resume();
                }
            }
            Log.d("DownloadService", "resume exist same item");
            return;
        }
    }
    HttpBuilderTarget target = downloadReceiver.load(downloadBean.getVideoUrl())
            .setFilePath(path)
            .ignoreFilePathOccupy()
            .mu8VodOption(getOption());
    List<DownloadEntity> downloadEntityList = downloadReceiver.getDRunningTask();
    if (downloadEntityList == null) {
        repeatTaskId = target.create();
    } else {
        repeatTaskId = target.add();
    }
    try {
        repeatTaskId = target.getEntity().getId();
        downloadBean.setTaskId(repeatTaskId);
        SP.getInstance().PutData(BaseApplication.getContext(),"lastDownloadID",repeatTaskId);
        target.setExtendField(new Gson().toJson(downloadBean)).getEntity().save();
    }catch (NullPointerException e){
        e.printStackTrace();
    }
}

辐射

再一次将service回调的接口回调至binder的接口，通过EventBus辐射至外部，通过一层层封装，在外部监听当前文件下载状态，只需通过监听EventBus事件即可

复制
 /**
     * download status
     *:prepare
     *:starting
     *:pause
     *:cancel
     *:failed
     *:completed
     *:running
     *:exception*/
    @Override
    public void onTaskStart(DownloadTask task) {
        EventBus.getDefault().postSticky(new DownloadStatusBean(,task.getDownloadEntity().getId(), task.getConvertSpeed(), task.getPercent(),task.getConvertFileSize(),task.getFilePath()));
    }
    @Override
    public void onTaskStop(DownloadTask task) {
        EventBus.getDefault().postSticky(new DownloadStatusBean(,task.getDownloadEntity().getId(), task.getConvertSpeed(), task.getPercent(),task.getConvertFileSize(),task.getFilePath()));
    }
    @Override
    public void onTaskCancel(DownloadTask task) {
        EventBus.getDefault().postSticky(new DownloadStatusBean(,task.getDownloadEntity().getId(), task.getConvertSpeed(), task.getPercent(),task.getConvertFileSize(),task.getFilePath()));
    }
    @Override
    public void onTaskFail(DownloadTask task) {
        EventBus.getDefault().postSticky(new DownloadStatusBean(,task.getDownloadEntity().getId(), task.getConvertSpeed(), task.getPercent(),task.getConvertFileSize(),task.getFilePath()));
    }
    @Override
    public void onTaskComplete(DownloadTask task) {
        EventBus.getDefault().postSticky(new DownloadStatusBean(,task.getDownloadEntity().getId(), task.getConvertSpeed(), task.getPercent(),task.getConvertFileSize(),task.getFilePath()));
    }
    @Override
    public void onTaskRunning(DownloadTask task) {
        EventBus.getDefault().postSticky(new DownloadStatusBean(,task.getDownloadEntity().getId(), task.getConvertSpeed(), task.getPercent(),task.getConvertFileSize(),task.getFilePath()));
    }
    @Override
    public void taskFail(DownloadTask task, Exception e) {
        try {
            EventBus.getDefault().postSticky(new DownloadStatusBean(,task.getDownloadEntity().getId(), task.getConvertSpeed(), task.getPercent(),task.getConvertFileSize(),task.getFilePath()));
        }catch (NullPointerException ee){
            ee.printStackTrace();
        }
    }
}

创建下载实例

一句话我们就可以实现视频下载，然后后天服务自动回调给binder,然后binder回调给EventBus

复制
 DownloadBean bean = new DownloadBean(L,m_id,"","",sourceBean.getLink(),detailBean.getCover(),detailBean.getTitle(),"","","movie","",0);
  DownloadBinder.getInstance().startDownload(bean);

监听下载状态

然后只需要在需要更新界面的地方注册EventBus即可，通过封装，不同的类做不同的事情，将数据处理和UI更新进行隔离，可以提高代码阅读和执行效率

复制
 /**
     * download status
     *:prepare
     *:starting
     *:pause
     *:cancel
     *:failed
     *:completed
     *:running
     *:exception*/
    /**
     * 下载item状态监听*/
    @Subscribe(threadMode = ThreadMode.MAIN, sticky = true)
    public void OnEvent(DownloadStatusBean bean) {
        taskID = bean.getTaskID();
        switch (bean.getStatus()) {
            case:
                getRunningItem();
                Log.d("DownloadService", "status start");
                break;
            case:
                updateStatus(bean);
                Log.d("DownloadService", "status pause");
                break;
            case:
                if ((index == -) && (beanList.size() > 0)){
                    index =;
                }
                Log.d("DownloadService", "status cancel"+bean.getTaskID());
                break;
            case:
                //update url
                failCount++;
                if (failCount >=){
                    failedReconnect(bean);
                    failCount =;
                    isRunning = true;
                    Log.d("DownloadService", "status fail in");
                }
                Log.d("DownloadService", "status fail");
                break;
            case:
                removeDownloadBead(bean.getTaskID());
                startDownload();
                Log.d("DownloadService", "status complete");
                break;
            case:
                if (isRunning) {
                    getRunningItem();
                }
                updateCurItem(bean);
                Log.d("DownloadService", "status running: "+index);
                break;
        }
    }