本篇内容主要讲解“Android如何实现下载m3u8视频文件功能”，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习“Android如何实现下载m3u8视频文件功能”吧!
下载器采用开源框架Aria
github
中文文档
implementation 'me.laoyuyu.aria:core:3.8.16'
annotationProcessor 'me.laoyuyu.aria:compiler:3.8.16'
implementation 'me.laoyuyu.aria:m3u8:3.8.16'
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
在Application中默认启动Service
private void bindService(){
DownloadService.bindService(this, new ServiceConnection() {
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
}
@Override
public void onServiceDisconnected(ComponentName name) {
downloadService = null;
}
});
}用于Aplication调用起服务
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
@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
@Nullable
@Override
public IBinder onBind(Intent intent) {
Log.d("DownloadService","bind service");
long taskId = (long)SP.getInstance().GetData(BaseApplication.getContext(),"lastDownloadID",0L);
if (taskId != 0L){
List<DownloadEntity> entityList = Aria.download(this).getAllNotCompleteTask();
if (entityList != null){
HttpNormalTarget target = Aria.download(this).load(taskId);
if (target.getTaskState() != STATE_COMPLETE){
target.m3u8VodOption(DownloadBinder.getInstance().getOption());
target.resume();
Log.d("DownloadService","resume download");
} else {
HttpNormalTarget resume = Aria.download(this).load( entityList.get(0).getId());
resume.m3u8VodOption(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
@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");
}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
@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);
}
}将服务中的Aria回调，回调至单例binder中
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);
}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;
}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
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 + ".m3u8";
Log.d("DownloadService", "start download");
boolean isExist = IsExist(path);
if (isExist) {
Log.d("DownloadService", "exist same item");
if (repeatTaskId != 0) {
if (Aria.download(this).load(repeatTaskId).getTaskState() != STATE_RUNNING) {
if (downloadReceiver.load(repeatTaskId).getEntity().getRealUrl().equals(downloadBean.getVideoUrl())) {
downloadReceiver.load(repeatTaskId).m3u8VodOption(DownloadBinder.getInstance().getOption());
downloadReceiver.load(repeatTaskId).resume();
} else {
downloadReceiver.load(repeatTaskId).m3u8VodOption(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()
.m3u8VodOption(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();
}
}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
/**
* download status
* 0:prepare
* 1:starting
* 2:pause
* 3:cancel
* 4:failed
* 5:completed
* 6:running
* 7:exception*/
@Override
public void onTaskStart(DownloadTask task) {
EventBus.getDefault().postSticky(new DownloadStatusBean(1,task.getDownloadEntity().getId(), task.getConvertSpeed(), task.getPercent(),task.getConvertFileSize(),task.getFilePath()));
}
@Override
public void onTaskStop(DownloadTask task) {
EventBus.getDefault().postSticky(new DownloadStatusBean(2,task.getDownloadEntity().getId(), task.getConvertSpeed(), task.getPercent(),task.getConvertFileSize(),task.getFilePath()));
}
@Override
public void onTaskCancel(DownloadTask task) {
EventBus.getDefault().postSticky(new DownloadStatusBean(3,task.getDownloadEntity().getId(), task.getConvertSpeed(), task.getPercent(),task.getConvertFileSize(),task.getFilePath()));
}
@Override
public void onTaskFail(DownloadTask task) {
EventBus.getDefault().postSticky(new DownloadStatusBean(4,task.getDownloadEntity().getId(), task.getConvertSpeed(), task.getPercent(),task.getConvertFileSize(),task.getFilePath()));
}
@Override
public void onTaskComplete(DownloadTask task) {
EventBus.getDefault().postSticky(new DownloadStatusBean(5,task.getDownloadEntity().getId(), task.getConvertSpeed(), task.getPercent(),task.getConvertFileSize(),task.getFilePath()));
}
@Override
public void onTaskRunning(DownloadTask task) {
EventBus.getDefault().postSticky(new DownloadStatusBean(6,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(4,task.getDownloadEntity().getId(), task.getConvertSpeed(), task.getPercent(),task.getConvertFileSize(),task.getFilePath()));
}catch (NullPointerException ee){
ee.printStackTrace();
}
}
}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
DownloadBean bean = new DownloadBean(0L,m_id,"","",sourceBean.getLink(),detailBean.getCover(),detailBean.getTitle(),"","","movie","",0); DownloadBinder.getInstance().startDownload(bean);
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
/**
* download status
* 0:prepare
* 1:starting
* 2:pause
* 3:cancel
* 4:failed
* 5:completed
* 6:running
* 7: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 1:
getRunningItem();
Log.d("DownloadService", "status start");
break;
case 2:
updateStatus(bean);
Log.d("DownloadService", "status pause");
break;
case 3:
if ((index == -1) && (beanList.size() > 0)){
index = 0;
}
Log.d("DownloadService", "status cancel"+bean.getTaskID());
break;
case 4:
//update url
failCount++;
if (failCount >= 3){
failedReconnect(bean);
failCount = 0;
isRunning = true;
Log.d("DownloadService", "status fail in");
}
Log.d("DownloadService", "status fail");
break;
case 5:
removeDownloadBead(bean.getTaskID());
startDownload();
Log.d("DownloadService", "status complete");
break;
case 6:
if (isRunning) {
getRunningItem();
}
updateCurItem(bean);
Log.d("DownloadService", "status running: "+index);
break;
}
}到此，相信大家对“Android如何实现下载m3u8视频文件功能”有了更深的了解，不妨来实际操作一番吧！这里是亿速云网站，更多相关内容可以进入相关频道进行查询，关注我们，继续学习！
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