Java tutorial
/* * Copyright (C) 2012 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package qirui.download; import static android.app.DownloadManager.Request.VISIBILITY_VISIBLE; import static android.app.DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_COMPLETED; import static android.app.DownloadManager.Request.VISIBILITY_VISIBLE_NOTIFY_ONLY_COMPLETION; import android.app.DownloadManager; import android.app.Notification; import android.app.NotificationManager; import android.app.PendingIntent; import android.content.ContentUris; import android.content.Context; import android.content.Intent; import android.content.res.Resources; import android.net.Uri; import android.os.SystemClock; import android.text.TextUtils; import android.text.format.DateUtils; import android.util.Log; import com.google.common.collect.ArrayListMultimap; import com.google.common.collect.Maps; import com.google.common.collect.Multimap; import java.util.Collection; import java.util.HashMap; import java.util.Iterator; /** * Update {@link NotificationManager} to reflect current {@link DownloadInfo} * states. Collapses similar downloads into a single notification, and builds * {@link PendingIntent} that launch towards {@link DownloadReceiver}. */ public class DownloadNotifier { private static final int TYPE_ACTIVE = 1; private static final int TYPE_WAITING = 2; private static final int TYPE_COMPLETE = 3; private final Context mContext; private final NotificationManager mNotifManager; /** * This download has started */ public static final int STATUS_RUNNING = 192; /** * Currently active notifications, mapped from clustering tag to timestamp * when first shown. * * @see #buildNotificationTag(DownloadInfo) */ @GuardedBy("mActiveNotifs") private final HashMap<String, Long> mActiveNotifs = Maps.newHashMap(); /** * Current speed of active downloads, mapped from {@link DownloadInfo#mId} * to speed in bytes per second. */ @GuardedBy("mDownloadSpeed") private final LongSparseLongArray mDownloadSpeed = new LongSparseLongArray(); /** * Last time speed was reproted, mapped from {@link DownloadInfo#mId} to * {@link SystemClock#elapsedRealtime()}. */ @GuardedBy("mDownloadSpeed") private final LongSparseLongArray mDownloadTouch = new LongSparseLongArray(); public DownloadNotifier(Context context) { mContext = context; mNotifManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE); } public void cancelAll() { mNotifManager.cancelAll(); } /** * Notify the current speed of an active download, used for calculating * estimated remaining time. */ public void notifyDownloadSpeed(long id, long bytesPerSecond) { synchronized (mDownloadSpeed) { if (bytesPerSecond != 0) { mDownloadSpeed.put(id, bytesPerSecond); mDownloadTouch.put(id, SystemClock.elapsedRealtime()); } else { mDownloadSpeed.delete(id); mDownloadTouch.delete(id); } } } /** * Update {@link NotificationManager} to reflect the given set of * {@link DownloadInfo}, adding, collapsing, and removing as needed. */ public void updateWith(Collection<DownloadInfo> downloads) { synchronized (mActiveNotifs) { updateWithLocked(downloads); } } private void updateWithLocked(Collection<DownloadInfo> downloads) { final Resources res = mContext.getResources(); // Cluster downloads together final Multimap<String, DownloadInfo> clustered = new ArrayListMultimap(); for (DownloadInfo info : downloads) { final String tag = buildNotificationTag(info); if (tag != null) { clustered.put(tag, info); } } // Build notification for each cluster for (String tag : clustered.keySet()) { final int type = getNotificationTagType(tag); final Collection<DownloadInfo> cluster = clustered.get(tag); final Notification.Builder builder = new Notification.Builder(mContext); // Use time when cluster was first shown to avoid shuffling final long firstShown; if (mActiveNotifs.containsKey(tag)) { firstShown = mActiveNotifs.get(tag); } else { firstShown = System.currentTimeMillis(); mActiveNotifs.put(tag, firstShown); } builder.setWhen(firstShown); // Show relevant icon if (type == TYPE_ACTIVE) { builder.setSmallIcon(android.R.drawable.stat_sys_download); } else if (type == TYPE_WAITING) { builder.setSmallIcon(android.R.drawable.stat_sys_warning); } else if (type == TYPE_COMPLETE) { builder.setSmallIcon(android.R.drawable.stat_sys_download_done); } // Build action intents if (type == TYPE_ACTIVE || type == TYPE_WAITING) { // build a synthetic uri for intent identification purposes final Uri uri = new Uri.Builder().scheme("active-dl").appendPath(tag).build(); final Intent intent = new Intent(Constants.ACTION_LIST, uri, mContext, DownloadReceiver.class); intent.putExtra(DownloadManager.EXTRA_NOTIFICATION_CLICK_DOWNLOAD_IDS, getDownloadIds(cluster)); builder.setContentIntent( PendingIntent.getBroadcast(mContext, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT)); builder.setOngoing(true); } else if (type == TYPE_COMPLETE) { final DownloadInfo info = cluster.iterator().next(); final Uri uri = ContentUris.withAppendedId(Downloads.Impl.ALL_DOWNLOADS_CONTENT_URI, info.mId); builder.setAutoCancel(true); final String action; if (Downloads.Impl.isStatusError(info.mStatus)) { action = Constants.ACTION_LIST; } else { if (info.mDestination != Downloads.Impl.DESTINATION_SYSTEMCACHE_PARTITION) { action = Constants.ACTION_OPEN; } else { action = Constants.ACTION_LIST; } } final Intent intent = new Intent(action, uri, mContext, DownloadReceiver.class); intent.putExtra(DownloadManager.EXTRA_NOTIFICATION_CLICK_DOWNLOAD_IDS, getDownloadIds(cluster)); builder.setContentIntent( PendingIntent.getBroadcast(mContext, 0, intent, PendingIntent.FLAG_UPDATE_CURRENT)); final Intent hideIntent = new Intent(Constants.ACTION_HIDE, uri, mContext, DownloadReceiver.class); builder.setDeleteIntent(PendingIntent.getBroadcast(mContext, 0, hideIntent, 0)); } // Calculate and show progress String remainingText = null; String percentText = null; if (type == TYPE_ACTIVE) { long current = 0; long total = 0; long speed = 0; synchronized (mDownloadSpeed) { for (DownloadInfo info : cluster) { if (info.mTotalBytes != -1) { current += info.mCurrentBytes; total += info.mTotalBytes; speed += mDownloadSpeed.get(info.mId); } } } if (total > 0) { final int percent = (int) ((current * 100) / total); percentText = res.getString(R.string.download_percent, percent); if (speed > 0) { final long remainingMillis = ((total - current) * 1000) / speed; remainingText = res.getString(R.string.download_remaining, ReflectUtils.formatDuration(remainingMillis)); } builder.setProgress(100, percent, false); } else { builder.setProgress(100, 0, true); } } // Build titles and description final Notification notif; if (cluster.size() == 1) { final DownloadInfo info = cluster.iterator().next(); builder.setContentTitle(getDownloadTitle(res, info)); if (type == TYPE_ACTIVE) { if (!TextUtils.isEmpty(info.mDescription)) { builder.setContentText(info.mDescription); } else { builder.setContentText(remainingText); } builder.setContentInfo(percentText); } else if (type == TYPE_WAITING) { builder.setContentText(res.getString(R.string.notification_need_wifi_for_size)); } else if (type == TYPE_COMPLETE) { if (Downloads.Impl.isStatusError(info.mStatus)) { builder.setContentText(res.getText(R.string.notification_download_failed)); } else if (Downloads.Impl.isStatusSuccess(info.mStatus)) { builder.setContentText(res.getText(R.string.notification_download_complete)); } } notif = builder.build(); } else { final Notification.InboxStyle inboxStyle = new Notification.InboxStyle(builder); for (DownloadInfo info : cluster) { inboxStyle.addLine(getDownloadTitle(res, info)); } if (type == TYPE_ACTIVE) { builder.setContentTitle( res.getQuantityString(R.plurals.notif_summary_active, cluster.size(), cluster.size())); builder.setContentText(remainingText); builder.setContentInfo(percentText); inboxStyle.setSummaryText(remainingText); } else if (type == TYPE_WAITING) { builder.setContentTitle( res.getQuantityString(R.plurals.notif_summary_waiting, cluster.size(), cluster.size())); builder.setContentText(res.getString(R.string.notification_need_wifi_for_size)); inboxStyle.setSummaryText(res.getString(R.string.notification_need_wifi_for_size)); } notif = inboxStyle.build(); } mNotifManager.notify(tag, 0, notif); } // Remove stale tags that weren't renewed final Iterator<String> it = mActiveNotifs.keySet().iterator(); while (it.hasNext()) { final String tag = it.next(); if (!clustered.containsKey(tag)) { mNotifManager.cancel(tag, 0); it.remove(); } } } private static CharSequence getDownloadTitle(Resources res, DownloadInfo info) { if (!TextUtils.isEmpty(info.mTitle)) { return info.mTitle; } else { return res.getString(R.string.download_unknown_title); } } private long[] getDownloadIds(Collection<DownloadInfo> infos) { final long[] ids = new long[infos.size()]; int i = 0; for (DownloadInfo info : infos) { ids[i++] = info.mId; } return ids; } public void dumpSpeeds() { synchronized (mDownloadSpeed) { for (int i = 0; i < mDownloadSpeed.size(); i++) { final long id = mDownloadSpeed.keyAt(i); final long delta = SystemClock.elapsedRealtime() - mDownloadTouch.get(id); Log.d(Constants.TAG, "Download " + id + " speed " + mDownloadSpeed.valueAt(i) + "bps, " + delta + "ms ago"); } } } /** * Build tag used for collapsing several {@link DownloadInfo} into a single * {@link Notification}. */ private static String buildNotificationTag(DownloadInfo info) { if (info.mStatus == Downloads.Impl.STATUS_QUEUED_FOR_WIFI) { return TYPE_WAITING + ":" + info.mPackage; } else if (isActiveAndVisible(info)) { return TYPE_ACTIVE + ":" + info.mPackage; } else if (isCompleteAndVisible(info)) { // Complete downloads always have unique notifs return TYPE_COMPLETE + ":" + info.mId; } else { return null; } } /** * Return the cluster type of the given tag, as created by * {@link #buildNotificationTag(DownloadInfo)}. */ private static int getNotificationTagType(String tag) { return Integer.parseInt(tag.substring(0, tag.indexOf(':'))); } private static boolean isActiveAndVisible(DownloadInfo download) { return download.mStatus == STATUS_RUNNING && (download.mVisibility == VISIBILITY_VISIBLE || download.mVisibility == VISIBILITY_VISIBLE_NOTIFY_COMPLETED); } private static boolean isCompleteAndVisible(DownloadInfo download) { return Downloads.Impl.isStatusCompleted(download.mStatus) && (download.mVisibility == VISIBILITY_VISIBLE_NOTIFY_COMPLETED || download.mVisibility == VISIBILITY_VISIBLE_NOTIFY_ONLY_COMPLETION); } }