protected synchronized void checkDownloads() { if (!Util.isExternalStoragePresent() || !lifecycleSupport.isExternalStorageAvailable()) { return; } if (shufflePlay) { checkShufflePlay(); } if (jukeboxEnabled || !Util.isNetworkConnected(this)) { return; } if (downloadList.isEmpty()) { return; } // Need to download current playing? if (currentPlaying != null && currentPlaying != currentDownloading && !currentPlaying.isCompleteFileAvailable()) { // Cancel current download, if necessary. if (currentDownloading != null) { currentDownloading.cancelDownload(); } currentDownloading = currentPlaying; currentDownloading.download(); cleanupCandidates.add(currentDownloading); } // Find a suitable target for download. else if (currentDownloading == null || currentDownloading.isWorkDone() || currentDownloading.isFailed()) { int n = size(); if (n == 0) { return; } int preloaded = 0; int start = currentPlaying == null ? 0 : getCurrentPlayingIndex(); int i = start; do { DownloadFile downloadFile = downloadList.get(i); if (!downloadFile.isWorkDone()) { if (downloadFile.shouldSave() || preloaded < Util.getPreloadCount(this)) { currentDownloading = downloadFile; currentDownloading.download(); cleanupCandidates.add(currentDownloading); break; } } else if (currentPlaying != downloadFile) { preloaded++; } i = (i + 1) % n; } while (i != start); } // Delete obsolete .partial and .complete files. cleanup(); }