Java tutorial
/* * Copyright (C) 2008 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 com.gzsll.downloads; import android.app.PendingIntent; import android.content.ContentUris; import android.content.Context; import android.content.Intent; import android.graphics.BitmapFactory; import android.net.Uri; import android.support.v4.app.NotificationCompat; import java.util.Collection; import java.util.HashMap; /** * This class handles the updating of the Notification Manager for the * cases where there is an ongoing download. Once the download is complete * (be it successful or unsuccessful) it is no longer the responsibility * of this component to show the download in the notification manager. */ class DownloadNotification { Context mContext; HashMap<String, NotificationItem> mNotifications; private SystemFacade mSystemFacade; public static final int NOTIFICATION_ID = 999; public static final int WAIT_NOTIFICATION_ID = 998; /** * This inner class is used to collate downloads that are owned by * the same application. This is so that only one notification line * item is used for all downloads of a given application. */ static class NotificationItem { int mId; // This first db _id for the download for the app long mTotalCurrent = 0; long mTotalTotal = 0; int mTitleCount = 0; String mPackageName; // App package name String mDescription; String[] mTitles = new String[2]; // download titles. String mPausedText = null; /* * Add a second download to this notification item. */ void addItem(String title, long currentBytes, long totalBytes) { mTotalCurrent += currentBytes; if (totalBytes <= 0 || mTotalTotal == -1) { mTotalTotal = -1; } else { mTotalTotal += totalBytes; } if (mTitleCount < 2) { mTitles[mTitleCount] = title; } mTitleCount++; } } /** * Constructor * * @param ctx The context to use to obtain access to the * Notification Service */ DownloadNotification(Context ctx, SystemFacade systemFacade) { mContext = ctx; mSystemFacade = systemFacade; mNotifications = new HashMap<String, NotificationItem>(); } /* * Update the notification ui. */ public void updateNotification(Collection<DownloadInfo> downloads) { updateActiveNotification(downloads); updateCompletedNotification(downloads); } private void updateActiveNotification(Collection<DownloadInfo> downloads) { // Collate the notifications mNotifications.clear(); for (DownloadInfo download : downloads) { if (!isActiveAndVisible(download)) { continue; } String packageName = download.mPackage; long max = download.mTotalBytes; long progress = download.mCurrentBytes; long id = download.mId; String title = download.mTitle; if (title == null || title.length() == 0) { title = mContext.getResources().getString(R.string.download_unknown_title); } NotificationItem item; if (mNotifications.containsKey(packageName)) { item = mNotifications.get(packageName); item.addItem(title, progress, max); } else { item = new NotificationItem(); item.mId = (int) id; item.mPackageName = packageName; item.mDescription = download.mDescription; item.addItem(title, progress, max); mNotifications.put(packageName, item); } if (download.mStatus == Downloads.STATUS_QUEUED_FOR_WIFI && item.mPausedText == null) { item.mPausedText = mContext.getResources().getString(R.string.notification_need_wifi_for_size); } } // Add the notifications for (NotificationItem item : mNotifications.values()) { NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(mContext); boolean hasPauseText = (item.mPausedText != null); if (item.mTitleCount > 1) { if (hasPauseText) { mBuilder.setContentTitle(item.mTitleCount + mContext.getResources().getString(R.string.notification_files_downloading_stop)); } else { mBuilder.setContentTitle(item.mTitleCount + mContext.getResources().getString(R.string.notification_files_downloading)); } mBuilder.setContentText(item.mTitles[0] + mContext.getResources().getString(R.string.notification_files_downloading_msg)); } else { mBuilder.setContentTitle(item.mTitles[0]); mBuilder.setContentText(""); } int iconResource = android.R.drawable.stat_sys_download; mBuilder.setSmallIcon(iconResource); mBuilder.setLargeIcon(BitmapFactory.decodeResource(mContext.getResources(), iconResource)); mBuilder.setContentIntent(getPendingContentIntent(item)); if (hasPauseText) { mBuilder.setContentText(item.mPausedText); mSystemFacade.postNotification(WAIT_NOTIFICATION_ID, mBuilder.build()); } else { mBuilder.setProgress((int) item.mTotalTotal, (int) item.mTotalCurrent, item.mTotalTotal == -1); mBuilder.setContentInfo(getDownloadingText(item.mTotalTotal, item.mTotalCurrent)); mSystemFacade.postNotification(NOTIFICATION_ID, mBuilder.build()); } } } private PendingIntent getPendingContentIntent(NotificationItem item) { Intent intent = new Intent(); intent.setAction(Constants.ACTION_LIST); intent.setFlags(Intent.FLAG_RECEIVER_FOREGROUND); intent.setClassName(mContext.getPackageName(), DownloadReceiver.class.getName()); intent.setData(ContentUris.withAppendedId(Downloads.ALL_DOWNLOADS_CONTENT_URI, item.mId)); intent.putExtra("multiple", item.mTitleCount > 1); return PendingIntent.getBroadcast(mContext, 0, intent, 0); } private void updateCompletedNotification(Collection<DownloadInfo> downloads) { for (DownloadInfo download : downloads) { if (!isCompleteAndVisible(download)) { continue; } long id = download.mId; String title = download.mTitle; if (title == null || title.length() == 0) { title = mContext.getResources().getString(R.string.download_unknown_title); } Uri contentUri = ContentUris.withAppendedId(Downloads.ALL_DOWNLOADS_CONTENT_URI, id); String caption; Intent intent; if (Downloads.isStatusError(download.mStatus)) { caption = mContext.getResources().getString(R.string.notification_download_failed); intent = new Intent(Constants.ACTION_LIST); } else { caption = mContext.getResources().getString(R.string.notification_download_complete); if (download.mDestination == Downloads.DESTINATION_EXTERNAL) { intent = new Intent(Constants.ACTION_OPEN); } else { intent = new Intent(Constants.ACTION_LIST); } } intent.setClassName(mContext.getPackageName(), DownloadReceiver.class.getName()); intent.setData(contentUri); NotificationCompat.Builder mBuilder = new NotificationCompat.Builder(mContext); mBuilder.setSmallIcon(android.R.drawable.stat_sys_download_done); mBuilder.setContentTitle(title); mBuilder.setContentText(caption); mBuilder.setWhen(download.mLastMod); mBuilder.setContentIntent(PendingIntent.getBroadcast(mContext, 0, intent, 0)); intent = new Intent(Constants.ACTION_HIDE); intent.setClassName(mContext.getPackageName(), DownloadReceiver.class.getName()); intent.setData(contentUri); mBuilder.setDeleteIntent(PendingIntent.getBroadcast(mContext, 0, intent, 0)); mSystemFacade.postNotification(download.mId, mBuilder.build()); } } private boolean isActiveAndVisible(DownloadInfo download) { return 100 <= download.mStatus && download.mStatus < 200 && download.mVisibility != Downloads.VISIBILITY_HIDDEN; } private boolean isCompleteAndVisible(DownloadInfo download) { return download.mStatus >= 200 && download.mVisibility == Downloads.VISIBILITY_VISIBLE_NOTIFY_COMPLETED; } /* * Helper function to build the downloading text. */ private String getDownloadingText(long totalBytes, long currentBytes) { if (totalBytes <= 0) { return ""; } long progress = currentBytes * 100 / totalBytes; StringBuilder sb = new StringBuilder(); sb.append(progress); sb.append('%'); return sb.toString(); } }