package com.example.musicplayer.service;
import android.app.Notification;
import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.Intent;
import android.graphics.BitmapFactory;
import android.os.Binder;
import android.os.Build;
import android.os.IBinder;
import android.support.annotation.Nullable;
import android.support.v4.app.NotificationCompat;
import android.widget.Toast;
import com.example.musicplayer.R;
import com.example.musicplayer.app.Api;
import com.example.musicplayer.app.Constant;
import com.example.musicplayer.download.DownloadListener;
import com.example.musicplayer.download.DownloadTask;
import com.example.musicplayer.entiy.DownloadInfo;
import com.example.musicplayer.event.DownloadEvent;
import com.example.musicplayer.event.SongListNumEvent;
import com.example.musicplayer.util.CommonUtil;
import com.example.musicplayer.util.DownloadUtil;
import com.example.musicplayer.view.MainActivity;
import org.greenrobot.eventbus.EventBus;
import org.litepal.LitePal;
import java.io.File;
import java.io.IOException;
import java.util.LinkedList;
import java.util.List;
import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.OkHttpClient;
import okhttp3.Request;
import okhttp3.Response;
import static com.example.musicplayer.app.Constant.TYPE_DOWNLOADING;
/**
* <pre>
* author : 残渊
* time : 2019/04/08
* desc : 下载服务，保证DownloadTask在后台运行
* </pre>
*/
public class DownloadService extends Service {
private static final String TAG = "DownloadService";
private DownloadTask downloadTask;
private String downloadUrl;
private DownloadBinder downloadBinder = new DownloadBinder();
private LinkedList<DownloadInfo> downloadQueue = new LinkedList<>();//等待队列
private int position = 0;//下载歌曲在下载歌曲列表的位置
private DownloadListener listener = new DownloadListener() {
@Override
public void onProgress(DownloadInfo downloadInfo) {
downloadInfo.setStatus(Constant.DOWNLOAD_ING);
EventBus.getDefault().post(new DownloadEvent(TYPE_DOWNLOADING, downloadInfo)); //通知下载模块
if(downloadInfo.getProgress()!=100){
getNotificationManager().notify(1, getNotification("正在下载: "+downloadInfo.getSongName(), downloadInfo.getProgress()));
}else {
if(downloadQueue.isEmpty()) getNotificationManager().notify(1, getNotification("下载成功",-1));
}
}
@Override
public void onSuccess() {
downloadTask = null;
DownloadInfo downloadInfo = downloadQueue.poll();
operateDb(downloadInfo); //操作数据库
start();//下载队列中的其它歌曲
//下载成功通知前台服务通知关闭，并创建一个下载成功的通知
stopForeground(true);
if(downloadQueue.isEmpty()) getNotificationManager().notify(1, getNotification("下载成功",-1));
}
@Override
public void onDownloaded() {
downloadTask = null;
CommonUtil.showToast(DownloadService.this, "已下载");
}
@Override
public void onFailed() {
downloadTask = null;
//下载失败通知前台服务通知关闭，并创建一个下载失败的通知
stopForeground(true);
getNotificationManager().notify(1, getNotification("下载失败",-1));
Toast.makeText(DownloadService.this, "下载失败", Toast.LENGTH_SHORT).show();
}
@Override
public void onPaused() {
downloadTask = null;
DownloadInfo downloadInfo=downloadQueue.poll();//从下载列表中移除该歌曲
updateDbOfPause(downloadInfo.getSongId());
getNotificationManager().notify(1, getNotification("下载已暂停："+downloadInfo.getSongName(), -1));
start();//下载下载列表中的歌曲
downloadInfo.setStatus(Constant.DOWNLOAD_PAUSED);
EventBus.getDefault().post(new DownloadEvent(Constant.TYPE_DOWNLOAD_PAUSED, downloadInfo)); //下载暂停
Toast.makeText(DownloadService.this, "下载已暂停", Toast.LENGTH_SHORT).show();
}
@Override
public void onCanceled() {
downloadTask = null;
stopForeground(true);
Toast.makeText(DownloadService.this, "下载已取消", Toast.LENGTH_SHORT).show();
}
};
@Nullable
@Override
public IBinder onBind(Intent intent) {
return downloadBinder;
}
public class DownloadBinder extends Binder {
public void startDownload(DownloadInfo song) {
try {
postDownloadEvent(song);//通知正在下载界面
} catch (Exception e) {
e.printStackTrace();
}
if (downloadTask != null) {
CommonUtil.showToast(DownloadService.this, "已经加入下载队列");
} else {
CommonUtil.showToast(DownloadService.this, "开始下载");
start();
}
}
public void pauseDownload(String songId) {
//暂停的歌曲是否为当前下载的歌曲
if (downloadTask != null &&downloadQueue.peek().getSongId().equals(songId)) {
downloadTask.pauseDownload();
}else {//暂停的歌曲是下载队列的歌曲
//将该歌曲从下载队列中移除
for (int i = 0; i < downloadQueue.size(); i++) {
DownloadInfo downloadInfo = downloadQueue.get(i);
if (downloadInfo.getSongId().equals(songId)) {
downloadQueue.remove(i);
updateDbOfPause(downloadInfo.getSongId());
downloadInfo.setStatus(Constant.DOWNLOAD_PAUSED);
EventBus.getDefault().post(new DownloadEvent(Constant.TYPE_DOWNLOAD_PAUSED, downloadInfo)); //下载暂停
}
}
}
}
public void cancelDownload(DownloadInfo song) {
String songId = song.getSongId();
//如果该歌曲正在下载，则需要将downloadTask置为null
if (downloadTask != null && downloadQueue.peek().getSongId().equals(songId)) {
downloadTask.cancelDownload();
}
//将该歌曲从下载队列中移除
for (int i = 0; i < downloadQueue.size(); i++) {
DownloadInfo downloadInfo = downloadQueue.get(i);
if (downloadInfo.getSongId().equals(songId)) downloadQueue.remove(i);
}
updateDb(songId);
deleteDb(songId);
//取消下载需要将文件删除并将通知关闭
if (song.getUrl() != null) {
checkoutFile(song,song.getUrl()); //实际文件长度
}
//通知正在下载列表
EventBus.getDefault().post(new DownloadEvent(Constant.TYPE_DOWNLOAD_CANCELED));
}
}
private void start() {
if (downloadTask == null && !downloadQueue.isEmpty()) {
DownloadInfo downloadInfo = downloadQueue.peek();
List<DownloadInfo> songList =
LitePal.where("songId = ?",downloadInfo.getSongId()).find(DownloadInfo.class);
DownloadInfo currentDownloadInfo = songList.get(0);
currentDownloadInfo.setStatus(Constant.DOWNLOAD_READY);
EventBus.getDefault().post(new DownloadEvent(TYPE_DOWNLOADING,currentDownloadInfo));
downloadUrl = currentDownloadInfo.getUrl();
downloadTask = new DownloadTask(listener);
downloadTask.execute(currentDownloadInfo);
getNotificationManager().notify(1, getNotification("正在下载："+downloadInfo.getSongName(), 0));
}
}
private NotificationManager getNotificationManager() {
return (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
}
private Notification getNotification(String title,int progress) {
Intent intent = new Intent(this, MainActivity.class);
PendingIntent pi = PendingIntent.getActivity(this, 0, intent, 0);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
String id = "channel_001";
String name = "下载通知";
NotificationChannel mChannel = new NotificationChannel(id, name, NotificationManager.IMPORTANCE_LOW);
getNotificationManager().createNotificationChannel(mChannel);
Notification.Builder builder = new Notification.Builder(this, id);
builder.setSmallIcon(R.mipmap.icon);
builder.setContentIntent(pi);
builder.setContentTitle(title);
if(progress>0){
builder.setContentText(progress +"%");
builder.setProgress(100, progress, false);
}
return builder.build();
} else {
NotificationCompat.Builder builder = new NotificationCompat.Builder(this, "default");
builder.setSmallIcon(R.mipmap.icon);
builder.setLargeIcon(BitmapFactory.decodeResource(getResources(), R.mipmap.icon));
builder.setContentIntent(pi);
builder.setContentTitle(title);
if(progress>0){
builder.setContentText(progress +"%");
builder.setProgress(100, progress, false);
}
return builder.build();
}
}
private void operateDb(DownloadInfo downloadInfo) {
updateDb(downloadInfo.getSongId());
deleteDb(downloadInfo.getSongId());
EventBus.getDefault().post(new DownloadEvent(Constant.TYPE_DOWNLOAD_SUCCESS));//通知已下载列表
EventBus.getDefault().post(new SongListNumEvent(Constant.LIST_TYPE_DOWNLOAD)); //通知主界面的下载个数需要改变
}
//更新数据库中歌曲列表的位置，即下载完成歌曲后的位置都要减去1；
private void updateDb(String songId) {
long id = LitePal.select("id").where("songId = ?", songId).find(DownloadInfo.class).get(0).getId();
List<DownloadInfo> songIdList = LitePal.where("id > ?", id + "").find(DownloadInfo.class);
for (DownloadInfo song : songIdList) {
song.setPosition(song.getPosition() - 1);
song.save();
}
}
//暂停时更新列表歌曲状态
private void updateDbOfPause(String songId){
List<DownloadInfo> statusList =
LitePal.where("songId = ?",songId).find(DownloadInfo.class,true);
DownloadInfo downloadInfo = statusList.get(0);
downloadInfo.setStatus(Constant.DOWNLOAD_PAUSED);
downloadInfo.save();
}
//下载完成时要删除下载歌曲表中的数据以及关联表中的数据
private void deleteDb(String songId) {
LitePal.deleteAll(DownloadInfo.class, "songId=?", songId);//删除已下载歌曲的相关列
}
private void postDownloadEvent(DownloadInfo downloadInfo) {
//如果需要下载的表中有该条歌曲，则添加到下载队列后跳过
List<DownloadInfo> downloadInfoList =
LitePal.where("songId = ?",downloadInfo.getSongId()).find(DownloadInfo.class,true);
if (downloadInfoList.size() != 0){
DownloadInfo historyDownloadInfo = downloadInfoList.get(0);
historyDownloadInfo.setStatus(Constant.DOWNLOAD_WAIT);
historyDownloadInfo.save();
EventBus.getDefault().post(new DownloadEvent(Constant.DOWNLOAD_PAUSED,historyDownloadInfo));
downloadQueue.offer(historyDownloadInfo);
return;
}
position = LitePal.findAll(DownloadInfo.class).size();
downloadInfo.setPosition(position);
downloadInfo.setStatus(Constant.DOWNLOAD_WAIT); //等待
downloadInfo.save();
downloadQueue.offer(downloadInfo);//将歌曲放到等待队列中
EventBus.getDefault().post(new DownloadEvent(Constant.TYPE_DOWNLOAD_ADD));
}
//获取歌曲实际大小，然后判断是否存在于文件中
public void checkoutFile(DownloadInfo song, String downloadUrl){
OkHttpClient client = new OkHttpClient();
Request request = new Request.Builder()
.url(downloadUrl)
.build();
Call call= client.newCall(request);
call.enqueue(new Callback() {
@Override
public void onFailure(Call call, IOException e) {
}
@Override
public void onResponse(Call call, Response response) throws IOException {
if(response.isSuccessful()){
long size = response.body().contentLength();
String fileName = DownloadUtil.getSaveSongFile(song.getSinger(),song.getSongName(),song.getDuration(),song.getSongId(),size);
File downloadFile = new File(Api.STORAGE_SONG_FILE);
String directory = String.valueOf(downloadFile);
File file = new File(fileName, directory);
if (file.exists()) {
file.delete();
}
getNotificationManager().cancel(1);
stopForeground(true);
}
}
});
}
}
