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本篇內容主要講解“Android如何實現下載m3u8視頻文件功能”，感興趣的朋友不妨來看看。本文介紹的方法操作簡單快捷，實用性強。下面就讓小編來帶大家學習“Android如何實現下載m3u8視頻文件功能”吧!
下載器采用開源框架Aria
github
中文文檔
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中啟動，即啟動app即啟動service并且service只啟動一次，后序通過單例binder去調用服務
在Application中默認啟動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調用起服務
public static void bindService(Context context, ServiceConnection connection){
Intent intent = new Intent(context, DownloadService.class);
context.bindService(intent, connection, Service.BIND_AUTO_CREATE);
}注冊下載器
@Override
public void onCreate() {
super.onCreate();
Aria.download(this).register();
Log.d("DownloadService","create service");
}若上次有未下載完成的視頻，則恢復下載，并將binder賦給另一個單例binder，后續使用binder進行具體下載事項
@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();
}注銷aria下載器和解除binder綁定
@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");
}然后將Aria下載器的回調在進行一次中轉，回調至單例binder，后面在下載就不需要binder服務，直接調用單例binder即可
@Download.onNoSupportBreakPoint public void onNoSupportBreakPoint(DownloadTask task) {
Log.d("DownloadService","該下載鏈接不支持斷點");
// DownloadBinder.getInstance().onTaskStart(task);
}
@Download.onTaskStart public void onTaskStart(DownloadTask task) {
Log.d("DownloadService",task.getDownloadEntity().getFileName() +":開始下載");
DownloadBinder.getInstance().onTaskStart(task);
}
@Download.onTaskStop public void onTaskStop(DownloadTask task) {
Log.d("DownloadService",task.getDownloadEntity().getFileName() +":停止下載");
DownloadBinder.getInstance().onTaskStop(task);
}
@Download.onTaskCancel public void onTaskCancel(DownloadTask task) {
Log.d("DownloadService",task.getDownloadEntity().getFileName() +":取消下載");
DownloadBinder.getInstance().onTaskCancel(task);
}
@Download.onTaskFail public void onTaskFail(DownloadTask task) {
Log.d("DownloadService",task.getDownloadEntity().getFileName() +":下載失敗");
DownloadBinder.getInstance().onTaskFail(task);
}
@Download.onTaskComplete public void onTaskComplete(DownloadTask task) {
Log.d("DownloadService",task.getDownloadEntity().getFileName() +":下載完成");
DownloadBinder.getInstance().onTaskComplete(task);
}
/**
* @param e 異常信息
*/
@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);
}
}將服務中的Aria回調，回調至單例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;
}將下載信息傳入，并以視頻type+id+name等構件下載文件夾名稱，確保唯一性，然后通過配置Aria Option，使其切換至m3u8文件下載模式，具體配置文件還可配置下載速度、最大下載文件數量、線程數等等。
Aria自帶數據庫，可通過其數據庫保存一些數據，但讀取數據較慢
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();
}
}再一次將service回調的接口回調至binder的接口，通過EventBus輻射至外部，通過一層層封裝，在外部監聽當前文件下載狀態，只需通過監聽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();
}
}
}一句話我們就可以實現視頻下載，然后后天服務自動回調給binder,然后binder回調給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冊EventBus即可，通過封裝，不同的類做不同的事情，將數據處理和UI更新進行隔離，可以提高代碼閱讀和執行效率
/**
* download status
* 0:prepare
* 1:starting
* 2:pause
* 3:cancel
* 4:failed
* 5:completed
* 6:running
* 7:exception*/
/**
* 下載item狀態監聽*/
@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，相信大家對“Android如何實現下載m3u8視頻文件功能”有了更深的了解，不妨來實際操作一番吧！這里是億速云網站，更多相關內容可以進入相關頻道進行查詢，關注我們，繼續學習！
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