概述

通知（Notification）是應用為用戶顯示重要信息提示的一種工具。系統為開發者提供了不同種類的通知樣式模板可以使用，開發者也可以根據自己需要自定義通知樣式。
之前寫過類似的通知demo，時間長代碼找不到了。另外，Google在Android N版本新增了可以直接回復的通知樣式，Android O版本新增了通知渠道（NotificationCannel），也是時候更新一下知識庫了。

代碼結構

與通知相關的主要邏輯在Notifications、NotificationChannels和NotificationService這三個類中。

• MainActivity.class
  主要是處理按鈕點擊事件，發送對應種類的通知。

  
  

• LaunchActivity.class
  點擊通知后啟動的Activity。

• Notifications.class
  封裝了一個單實例來發送通知，里面定義了發送各種通知的方法。

• NotificationChannels.class
  把demo中用到的所有NotificationChannel封裝到一個方法里面，在應用啟動的時候一次性創建。

• CustomApplication.class
  在應用啟動后一次性創建所有需要的NotificationChannel。

• NotificationService.class
  后臺服務，負責處理與通知相關的所有響應事件。

• NotificationContentWrapper.class
  封裝的通知數據結構體，通過一個對象傳遞所有相關數據。

通知渠道（NotificationChannel）

通知渠道是Google在Android O中新增加的功能或是增強，新的版本中把振動、音效和燈效（實際上很多手機已經沒有呼吸燈了）等相關效果放在了通知渠道中控制，這樣用戶就可以有選擇的控制應用的某一類通知的通知效果，而不像之前版本中應用所有通知都受控于一種設置。需要注意的是，在Android O版本中，發送通知的時候必須要為通知設置通知渠道，否則通知不會被發送。

public class NotificationChannels {public final static String CRITICAL = "critical";public final static String IMPORTANCE = "importance";public final static String DEFAULT = "default";public final static String LOW = "low";public final static String MEDIA = "media";public static void createAllNotificationChannels(Context context) {NotificationManager nm = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);if(nm == null) {return;}NotificationChannel mediaChannel = new NotificationChannel(MEDIA,context.getString(R.string.channel_media),NotificationManager.IMPORTANCE_DEFAULT);mediaChannel.setSound(null,null);mediaChannel.setVibrationPattern(null);nm.createNotificationChannels(Arrays.asList(new NotificationChannel(CRITICAL,context.getString(R.string.channel_critical),NotificationManager.IMPORTANCE_HIGH),new NotificationChannel(IMPORTANCE,context.getString(R.string.channel_importance),NotificationManager.IMPORTANCE_DEFAULT),new NotificationChannel(DEFAULT,context.getString(R.string.channel_default),NotificationManager.IMPORTANCE_LOW),new NotificationChannel(LOW,context.getString(R.string.channel_low),NotificationManager.IMPORTANCE_MIN),//custom notification channelmediaChannel));} }

創建通知渠道的時候如果不額外設置音效、振動和燈光效果，通知在播放的時候會根據通知渠道中設置的重要等級（importance）來播放對應的通知效果。當然系統也提供了對應的方法來設置這些效果，實現方法可以參見上面代碼中的meidiaChannel的實現。

各種優先級及對應效果如下：

/*** A notification with no importance: does not show in the shade.*/public static final int IMPORTANCE_NONE = 0;/*** Min notification importance: only shows in the shade, below the fold.*/public static final int IMPORTANCE_MIN = 1;/*** Low notification importance: shows everywhere, but is not intrusive.*/public static final int IMPORTANCE_LOW = 2;/*** Default notification importance: shows everywhere, makes noise, but does not visually* intrude.*/public static final int IMPORTANCE_DEFAULT = 3;/*** Higher notification importance: shows everywhere, makes noise and peeks. May use full screen* intents.*/public static final int IMPORTANCE_HIGH = 4;/*** Unused.*/public static final int IMPORTANCE_MAX = 5;

各種樣式的通知

下面給出各種式樣的通知的效果圖和寫法，可以根據實際需求選擇合適的方法，也可以自行組合。

簡單通知

• 效果圖

  
  

• 示例代碼

public void sendSimpleNotification(Context context,NotificationManager nm) {//創建點擊通知時發送的廣播Intent intent = new Intent(context,NotificationService.class);intent.setAction(ACTION_SIMPLE);PendingIntent pi = PendingIntent.getService(context,0,intent,0);//創建刪除通知時發送的廣播Intent deleteIntent = new Intent(context,NotificationService.class);deleteIntent.setAction(ACTION_DELETE);PendingIntent deletePendingIntent = PendingIntent.getService(context,0,deleteIntent,0);//創建通知Notification.Builder nb = new Notification.Builder(context,NotificationChannels.LOW)//設置通知左側的小圖標.setSmallIcon(R.mipmap.ic_notification)//設置通知標題.setContentTitle("Simple notification")//設置通知內容.setContentText("Demo for simple notification !")//設置點擊通知后自動刪除通知.setAutoCancel(true)//設置顯示通知時間.setShowWhen(true)//設置通知右側的大圖標.setLargeIcon(BitmapFactory.decodeResource(context.getResources(),R.mipmap.ic_notifiation_big))//設置點擊通知時的響應事件.setContentIntent(pi)//設置刪除通知時的響應事件.setDeleteIntent(deletePendingIntent);//發送通知nm.notify(NOTIFICATION_SAMPLE,nb.build());}

帶Action按鈕通知

• 效果圖

  
  
• 示例代碼

public void sendActionNotification(Context context,NotificationManager nm) {//創建點擊通知時發送的廣播Intent intent = new Intent(context,NotificationService.class);intent.setAction(ACTION_ACTION);PendingIntent pi = PendingIntent.getService(context,0,intent,0);//創建通知Notification.Builder nb = new Notification.Builder(context,NotificationChannels.DEFAULT)//設置通知左側的小圖標.setSmallIcon(R.mipmap.ic_notification)//設置通知標題.setContentTitle("Action notification")//設置通知內容.setContentText("Demo for action notification !")//設置點擊通知后自動刪除通知.setAutoCancel(true)//設置顯示通知時間.setShowWhen(true)//設置點擊通知時的響應事件.setContentIntent(pi);//創建點擊通知 YES 按鈕時發送的廣播Intent yesIntent = new Intent(context, NotificationService.class);yesIntent.setAction(ACTION_YES);PendingIntent yesPendingIntent = PendingIntent.getService(context,0,yesIntent,0);Notification.Action yesActionBuilder = new Notification.Action.Builder(Icon.createWithResource("", R.mipmap.ic_yes),"YES",yesPendingIntent).build();//創建點擊通知 NO 按鈕時發送的廣播Intent noIntent = new Intent(context,NotificationService.class);noIntent.setAction(ACTION_NO);PendingIntent noPendingIntent = PendingIntent.getService(context,0,noIntent,0);Notification.Action noActionBuilder = new Notification.Action.Builder(Icon.createWithResource("", R.mipmap.ic_no),"NO",noPendingIntent).build();//為通知添加按鈕nb.setActions(yesActionBuilder,noActionBuilder);//發送通知nm.notify(NOTIFICATION_ACTION,nb.build());}

帶快速回復功能通知

• 效果圖

  
  
  
• 示例代碼

public void sendRemoteInputNotification(Context context,NotificationManager nm) {//創建點擊通知時發送的廣播Intent intent = new Intent(context,NotificationService.class);intent.setAction(ACTION_REMOTE_INPUT);PendingIntent pi = PendingIntent.getService(context,0,intent,0);//創建通知Notification.Builder nb = new Notification.Builder(context,NotificationChannels.IMPORTANCE)//設置通知左側的小圖標.setSmallIcon(R.mipmap.ic_notification)//設置通知標題.setContentTitle("Remote input notification")//設置通知內容.setContentText("Demo for remote input notification !")//設置點擊通知后自動刪除通知.setAutoCancel(true)//設置顯示通知時間.setShowWhen(true)//設置點擊通知時的響應事件.setContentIntent(pi);//創建帶輸入框的按鈕RemoteInput remoteInput = new RemoteInput.Builder(REMOTE_INPUT_RESULT_KEY).setLabel("Reply").build();Intent remoteInputIntent = new Intent(context,NotificationService.class);remoteInputIntent.setAction(ACTION_REPLY);PendingIntent replyPendingIntent = PendingIntent.getService(context,2,remoteInputIntent,0);Notification.Action replyAction = new Notification.Action.Builder(Icon.createWithResource("",R.mipmap.ic_reply),"Reply",replyPendingIntent).addRemoteInput(remoteInput).build();//為通知添加按鈕nb.setActions(replyAction);//發送通知nm.notify(NOTIFICATION_REMOTE_INPUT,nb.build());}

大圖效果通知（BigPictureStyle）

• 效果圖

  
  
• 示例代碼

public void sendBigPictureStyleNotification(Context context,NotificationManager nm) {//創建點擊通知時發送的廣播Intent intent = new Intent(context,NotificationService.class);intent.setAction(ACTION_BIG_PICTURE_STYLE);PendingIntent pi = PendingIntent.getService(context,0,intent,0);//創建大視圖樣式Notification.BigPictureStyle bigPictureStyle = new Notification.BigPictureStyle().setBigContentTitle("Big picture style notification ~ Expand title").setSummaryText("Demo for big picture style notification ! ~ Expand summery").bigPicture(BitmapFactory.decodeResource(context.getResources(),R.mipmap.big_style_picture));//創建通知Notification.Builder nb = new Notification.Builder(context,NotificationChannels.DEFAULT)//設置通知左側的小圖標.setSmallIcon(R.mipmap.ic_notification)//設置通知標題.setContentTitle("Big picture style notification")//設置通知內容.setContentText("Demo for big picture style notification !")//設置點擊通知后自動刪除通知.setAutoCancel(true)//設置顯示通知時間.setShowWhen(true)//設置點擊通知時的響應事件.setContentIntent(pi)//設置大視圖樣式通知.setStyle(bigPictureStyle);//發送通知nm.notify(NOTIFICATION_BIG_PICTURE_STYLE,nb.build());}

多文字效果通知（BigTextStyle）

• 示例代碼

public void sendBigTextStyleNotification(Context context,NotificationManager nm) {//創建點擊通知時發送的廣播Intent intent = new Intent(context,NotificationService.class);intent.setAction(ACTION_BIG_TEXT_STYLE);PendingIntent pi = PendingIntent.getService(context,0,intent,0);//創建大文字樣式Notification.BigTextStyle bigTextStyle = new Notification.BigTextStyle().setBigContentTitle("Big text style notification ~ Expand title").setSummaryText("Demo for big text style notification ! ~ Expand summery").bigText("We are the champions \n" +"We are the champions \n" +"No time for losers \n" +"Cause we are the champions of the World");//創建通知Notification.Builder nb = new Notification.Builder(context,NotificationChannels.DEFAULT)//設置通知左側的小圖標.setSmallIcon(R.mipmap.ic_notification)//設置通知標題.setContentTitle("Big text style notification")//設置通知內容.setContentText("Demo for big text style notification !")//設置點擊通知后自動刪除通知.setAutoCancel(true)//設置顯示通知時間.setShowWhen(true)//設置點擊通知時的響應事件.setContentIntent(pi)//設置大文字樣式通知.setStyle(bigTextStyle);//發送通知nm.notify(NOTIFICATION_BIG_TEXT_STYLE,nb.build());}

信箱效果通知（InboxStyle）

• 效果圖

  
  
• 示例代碼

public void sendInboxStyleNotification(Context context, NotificationManager nm) {//創建點擊通知時發送的廣播Intent intent = new Intent(context,NotificationService.class);intent.setAction(ACTION_INBOX_STYLE);PendingIntent pi = PendingIntent.getService(context,0,intent,0);//創建信箱樣式Notification.InboxStyle inboxStyle = new Notification.InboxStyle().setBigContentTitle("Inbox style notification ~ Expand title").setSummaryText("Demo for inbox style notification ! ~ Expand summery")//最多六行.addLine("1. I am email content.").addLine("2. I am email content.").addLine("3. I am email content.").addLine("4. I am email content.").addLine("5. I am email content.").addLine("6. I am email content.");//創建通知Notification.Builder nb = new Notification.Builder(context,NotificationChannels.DEFAULT)//設置通知左側的小圖標.setSmallIcon(R.mipmap.ic_notification)//設置通知標題.setContentTitle("Inbox style notification")//設置通知內容.setContentText("Demo for inbox style notification !")//設置點擊通知后自動刪除通知.setAutoCancel(true)//設置顯示通知時間.setShowWhen(true)//設置點擊通知時的響應事件.setContentIntent(pi)//設置信箱樣式通知.setStyle(inboxStyle);//發送通知nm.notify(NOTIFICATION_INBOX_STYLE,nb.build());}

媒體效果通知（MediaStyle）

• 效果圖

  
  
• 示例代碼

public void sendMediaStyleNotification(Context context, NotificationManager nm, boolean isPlaying) {//創建點擊通知時發送的廣播Intent intent = new Intent(context,NotificationService.class);intent.setAction(ACTION_MEDIA_STYLE);PendingIntent pi = PendingIntent.getService(context,0,intent,0);//創建Action按鈕Intent playOrPauseIntent = new Intent(context,NotificationService.class);playOrPauseIntent.setAction(ACTION_MEDIA_STYLE);playOrPauseIntent.putExtra(EXTRA_OPTIONS, isPlaying ? MEDIA_STYLE_ACTION_PAUSE : MEDIA_STYLE_ACTION_PLAY);PendingIntent playOrPausePendingIntent = PendingIntent.getService(context,0, playOrPauseIntent,PendingIntent.FLAG_UPDATE_CURRENT);Notification.Action playOrPauseAction = new Notification.Action.Builder(Icon.createWithResource(context,isPlaying ? R.mipmap.ic_pause : R.mipmap.ic_play),isPlaying ? "PAUSE" : "PLAY",playOrPausePendingIntent).build();Intent nextIntent = new Intent(context,NotificationService.class);nextIntent.setAction(ACTION_MEDIA_STYLE);nextIntent.putExtra(EXTRA_OPTIONS, MEDIA_STYLE_ACTION_NEXT);PendingIntent nextPendingIntent = PendingIntent.getService(context,1, nextIntent,PendingIntent.FLAG_UPDATE_CURRENT);Notification.Action nextAction = new Notification.Action.Builder(Icon.createWithResource(context,R.mipmap.ic_next),"Next",nextPendingIntent).build();Intent deleteIntent = new Intent(context,NotificationService.class);deleteIntent.setAction(ACTION_MEDIA_STYLE);deleteIntent.putExtra(EXTRA_OPTIONS,MEDIA_STYLE_ACTION_DELETE);PendingIntent deletePendingIntent = PendingIntent.getService(context,2, deleteIntent,PendingIntent.FLAG_UPDATE_CURRENT);Notification.Action deleteAction = new Notification.Action.Builder(Icon.createWithResource(context,R.mipmap.ic_delete),"Delete",deletePendingIntent).build();//創建媒體樣式Notification.MediaStyle mediaStyle = new Notification.MediaStyle()//最多三個Action.setShowActionsInCompactView(0,1,2);//創建通知Notification.Builder nb = new Notification.Builder(context,NotificationChannels.MEDIA)//設置通知左側的小圖標.setSmallIcon(R.mipmap.ic_notification)//設置通知標題.setContentTitle("Media style notification")//設置通知內容.setContentText("Demo for media style notification !")//設置通知不可刪除.setOngoing(true)//設置顯示通知時間.setShowWhen(true)//設置點擊通知時的響應事件.setContentIntent(pi)//設置Action按鈕.setActions(playOrPauseAction,nextAction,deleteAction)//設置信箱樣式通知.setStyle(mediaStyle);//發送通知nm.notify(NOTIFICATION_MEDIA_STYLE,nb.build());}

信息效果通知（MessagingStyle）

• 效果圖

  
  
• 示例代碼

public void sendMessagingStyleNotification(Context context, NotificationManager nm) {//創建點擊通知時發送的廣播Intent intent = new Intent(context,NotificationService.class);intent.setAction(ACTION_MESSAGING_STYLE);PendingIntent pi = PendingIntent.getService(context,0,intent,0);//創建信息樣式Notification.MessagingStyle messagingStyle = new Notification.MessagingStyle("peter").setConversationTitle("Messaging style notification").addMessage("This is a message for you", System.currentTimeMillis(),"peter");//創建通知Notification.Builder nb = new Notification.Builder(context,NotificationChannels.DEFAULT)//設置通知左側的小圖標.setSmallIcon(R.mipmap.ic_notification)//設置通知標題.setContentTitle("Messaging style notification")//設置通知內容.setContentText("Demo for messaging style notification !")//設置點擊通知后自動刪除通知.setAutoCancel(true)//設置顯示通知時間.setShowWhen(true)//設置點擊通知時的響應事件.setContentIntent(pi)//設置信箱樣式通知.setStyle(messagingStyle);//發送通知nm.notify(NOTIFICATION_MESSAGING_STYLE,nb.build());}

帶進度條通知

• 效果圖

  
  
• 示例代碼

public void sendProgressViewNotification(Context context,NotificationManager nm, int progress) {//創建點擊通知時發送的廣播Intent intent = new Intent(context,NotificationService.class);intent.setAction(ACTION_PROGRESS);PendingIntent pi = PendingIntent.getService(context,0,intent,0);//創建通知Notification.Builder nb = new Notification.Builder(context,NotificationChannels.LOW)//設置通知左側的小圖標.setSmallIcon(R.mipmap.ic_notification)//設置通知標題.setContentTitle("Downloading...")//設置通知內容.setContentText(String.valueOf(progress) + "%")//設置通知不可刪除.setOngoing(true)//設置顯示通知時間.setShowWhen(true)//設置點擊通知時的響應事件.setContentIntent(pi).setProgress(100,progress,false);//發送通知nm.notify(NOTIFICATION_PROGRESS,nb.build());}

自定義頂部提醒視圖通知（CustomHeadsUpView）

• 效果圖

  
  
• 示例代碼

public void sendCustomHeadsUpViewNotification(Context context, NotificationManager nm) {//創建點擊通知時發送的廣播Intent intent = new Intent(context,LaunchActivity.class);PendingIntent pi = PendingIntent.getActivity(context,0,intent,0);//創建自定義頂部提醒視圖Intent answerIntent = new Intent(context,NotificationService.class);answerIntent.setAction(ACTION_CUSTOM_HEADS_UP_VIEW);answerIntent.putExtra(EXTRA_OPTIONS, ACTION_ANSWER);PendingIntent answerPendingIntent = PendingIntent.getService(context,0,answerIntent,PendingIntent.FLAG_UPDATE_CURRENT);Intent rejectIntent = new Intent(context,NotificationService.class);rejectIntent.setAction(ACTION_CUSTOM_HEADS_UP_VIEW);rejectIntent.putExtra(EXTRA_OPTIONS,ACTION_REJECT);PendingIntent rejectPendingIntent = PendingIntent.getService(context,1,rejectIntent,PendingIntent.FLAG_UPDATE_CURRENT);RemoteViews headsUpView = new RemoteViews(context.getPackageName(),R.layout.custom_heads_up_layout);headsUpView.setOnClickPendingIntent(R.id.iv_answer,answerPendingIntent);headsUpView.setOnClickPendingIntent(R.id.iv_reject,rejectPendingIntent);//創建通知Notification.Builder nb = new Notification.Builder(context,NotificationChannels.CRITICAL)//設置通知左側的小圖標.setSmallIcon(R.mipmap.ic_notification)//設置通知標題.setContentTitle("Custom heads up notification")//設置通知內容.setContentText("Demo for custom heads up notification !")//設置點擊通知后自動刪除通知.setAutoCancel(true)//設置顯示通知時間.setShowWhen(true)//設置點擊通知時的響應事件.setContentIntent(pi)//設置全屏響應事件;.setFullScreenIntent(pi,true)//設置自定義頂部提醒視圖.setCustomHeadsUpContentView(headsUpView);//發送通知nm.notify(NOTIFICATION_CUSTOM_HEADS_UP,nb.build());}

自定義視圖通知（CustomView）

• 效果圖

  
  

• 示例代碼

public void sendCustomViewNotification(Context context, NotificationManager nm, NotificationContentWrapper content, Boolean isLoved, Boolean isPlaying) {//創建點擊通知時發送的廣播Intent intent = new Intent(context,LaunchActivity.class);PendingIntent pi = PendingIntent.getActivity(context,0,intent,0);//創建各個按鈕的點擊響應廣播Intent intentLove = new Intent(context,NotificationService.class);intentLove.setAction(ACTION_CUSTOM_VIEW_OPTIONS_LOVE);PendingIntent piLove = PendingIntent.getService(context,0,intentLove,PendingIntent.FLAG_UPDATE_CURRENT);Intent intentPre = new Intent(context,NotificationService.class);intentPre.setAction(ACTION_CUSTOM_VIEW_OPTIONS_PRE);PendingIntent piPre = PendingIntent.getService(context,0,intentPre,PendingIntent.FLAG_UPDATE_CURRENT);Intent intentPlayOrPause = new Intent(context,NotificationService.class);intentPlayOrPause.setAction(ACTION_CUSTOM_VIEW_OPTIONS_PLAY_OR_PAUSE);PendingIntent piPlayOrPause = PendingIntent.getService(context,0, intentPlayOrPause,PendingIntent.FLAG_UPDATE_CURRENT);Intent intentNext = new Intent(context,NotificationService.class);intentNext.setAction(ACTION_CUSTOM_VIEW_OPTIONS_NEXT);PendingIntent piNext = PendingIntent.getService(context,0,intentNext,PendingIntent.FLAG_UPDATE_CURRENT);Intent intentLyrics = new Intent(context,NotificationService.class);intentLyrics.setAction(ACTION_CUSTOM_VIEW_OPTIONS_LYRICS);PendingIntent piLyrics = PendingIntent.getService(context,0,intentLyrics,PendingIntent.FLAG_UPDATE_CURRENT);Intent intentCancel = new Intent(context,NotificationService.class);intentCancel.setAction(ACTION_CUSTOM_VIEW_OPTIONS_CANCEL);PendingIntent piCancel = PendingIntent.getService(context,0,intentCancel,PendingIntent.FLAG_UPDATE_CURRENT);//創建自定義小視圖RemoteViews customView = new RemoteViews(context.getPackageName(),R.layout.custom_view_layout);customView.setImageViewBitmap(R.id.iv_content,content.bitmap);customView.setTextViewText(R.id.tv_title,content.title);customView.setTextViewText(R.id.tv_summery,content.summery);customView.setImageViewBitmap(R.id.iv_play_or_pause,BitmapFactory.decodeResource(context.getResources(),isPlaying ? R.mipmap.ic_pause : R.mipmap.ic_play));customView.setOnClickPendingIntent(R.id.iv_play_or_pause,piPlayOrPause);customView.setOnClickPendingIntent(R.id.iv_next,piNext);customView.setOnClickPendingIntent(R.id.iv_lyrics,piLyrics);customView.setOnClickPendingIntent(R.id.iv_cancel,piCancel);//創建自定義大視圖RemoteViews customBigView = new RemoteViews(context.getPackageName(),R.layout.custom_big_view_layout);customBigView.setImageViewBitmap(R.id.iv_content_big,content.bitmap);customBigView.setTextViewText(R.id.tv_title_big,content.title);customBigView.setTextViewText(R.id.tv_summery_big,content.summery);customBigView.setImageViewBitmap(R.id.iv_love_big,BitmapFactory.decodeResource(context.getResources(),isLoved ? R.mipmap.ic_loved : R.mipmap.ic_love));customBigView.setImageViewBitmap(R.id.iv_play_or_pause_big,BitmapFactory.decodeResource(context.getResources(),isPlaying ? R.mipmap.ic_pause : R.mipmap.ic_play));customBigView.setOnClickPendingIntent(R.id.iv_love_big,piLove);customBigView.setOnClickPendingIntent(R.id.iv_pre_big,piPre);customBigView.setOnClickPendingIntent(R.id.iv_play_or_pause_big,piPlayOrPause);customBigView.setOnClickPendingIntent(R.id.iv_next_big,piNext);customBigView.setOnClickPendingIntent(R.id.iv_lyrics_big,piLyrics);customBigView.setOnClickPendingIntent(R.id.iv_cancel_big,piCancel);//創建通知Notification.Builder nb = new Notification.Builder(context,NotificationChannels.MEDIA)//設置通知左側的小圖標.setSmallIcon(R.mipmap.ic_notification)//設置通知標題.setContentTitle("Custom notification")//設置通知內容.setContentText("Demo for custom notification !")//設置通知不可刪除.setOngoing(true)//設置顯示通知時間.setShowWhen(true)//設置點擊通知時的響應事件.setContentIntent(pi)//設置自定義小視圖.setCustomContentView(customView)//設置自定義大視圖.setCustomBigContentView(customBigView);//發送通知nm.notify(NOTIFICATION_CUSTOM,nb.build());}

通知相關事件響應

從上面發送通知的示例代碼可以看出，所有與點擊通知相關的響應事件都是通過PendingIntent來完成的。具體是如何交互的可以參照對應的廣播事件處理來學習。

public class NotificationService extends Service {private final static String TAG = "NotificationService";public final static String ACTION_SEND_PROGRESS_NOTIFICATION = "com.android.peter.notificationdemo.ACTION_SEND_PROGRESS_NOTIFICATION";private Context mContext;private NotificationManager mNM;private boolean mIsLoved;private boolean mIsPlaying = true;private List<NotificationContentWrapper> mContent = new ArrayList<>();private int mCurrentPosition = 1;@Overridepublic void onCreate() {super.onCreate();mContext = this;mNM = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);initNotificationContent();}@Overridepublic int onStartCommand(Intent intent, int flags, int startId) {if(intent != null && intent.getAction() != null) {Log.i(TAG,"onStartCommand action = " + intent.getAction());switch (intent.getAction()) {case ACTION_SIMPLE:break;case ACTION_ACTION:break;case ACTION_REMOTE_INPUT:break;case ACTION_BIG_PICTURE_STYLE:break;case ACTION_BIG_TEXT_STYLE:break;case ACTION_INBOX_STYLE:break;case ACTION_MEDIA_STYLE:dealWithActionMediaStyle(intent);break;case ACTION_MESSAGING_STYLE:break;case ACTION_YES:mNM.cancel(NOTIFICATION_ACTION);break;case ACTION_NO:mNM.cancel(NOTIFICATION_ACTION);break;case ACTION_DELETE:break;case ACTION_REPLY:dealWithActionReplay(intent);break;case ACTION_PROGRESS:break;case ACTION_SEND_PROGRESS_NOTIFICATION:dealWithActionSendProgressNotification();break;case ACTION_CUSTOM_HEADS_UP_VIEW:dealWithActionCustomHeadsUpView(intent);break;case ACTION_CUSTOM_VIEW:break;case ACTION_CUSTOM_VIEW_OPTIONS_LOVE:Notificaitons.getInstance().sendCustomViewNotification(this,mNM,mContent.get(mCurrentPosition),!mIsLoved,mIsPlaying);mIsLoved = !mIsLoved;break;case ACTION_CUSTOM_VIEW_OPTIONS_PRE:--mCurrentPosition;Notificaitons.getInstance().sendCustomViewNotification(this,mNM,getNotificationContent(),mIsLoved,mIsPlaying);break;case ACTION_CUSTOM_VIEW_OPTIONS_PLAY_OR_PAUSE:Notificaitons.getInstance().sendCustomViewNotification(this,mNM,mContent.get(mCurrentPosition),mIsLoved,!mIsPlaying);mIsPlaying = !mIsPlaying;break;case ACTION_CUSTOM_VIEW_OPTIONS_NEXT:++mCurrentPosition;Notificaitons.getInstance().sendCustomViewNotification(this,mNM,getNotificationContent(),mIsLoved,mIsPlaying);break;case ACTION_CUSTOM_VIEW_OPTIONS_LYRICS:break;case ACTION_CUSTOM_VIEW_OPTIONS_CANCEL:mNM.cancel(NOTIFICATION_CUSTOM);break;default://do nothing}}return START_STICKY;}@Nullable@Overridepublic IBinder onBind(Intent intent) {return null;}private void initNotificationContent() {mContent.clear();mContent.add(new NotificationContentWrapper(BitmapFactory.decodeResource(mContext.getResources(),R.mipmap.custom_view_picture_pre),"遠走高飛","金志文"));mContent.add(new NotificationContentWrapper(BitmapFactory.decodeResource(mContext.getResources(),R.mipmap.custom_view_picture_current),"最美的期待","周筆暢 - 最美的期待"));mContent.add(new NotificationContentWrapper(BitmapFactory.decodeResource(mContext.getResources(),R.mipmap.custom_view_picture_next),"你打不過我吧","跟風超人"));}private void dealWithActionMediaStyle(Intent intent) {String option = intent.getStringExtra(EXTRA_OPTIONS);Log.i(TAG,"media option = " + option);if(option == null) {return;}switch (option) {case MEDIA_STYLE_ACTION_PAUSE:Notificaitons.getInstance().sendMediaStyleNotification(this,mNM,false);break;case MEDIA_STYLE_ACTION_PLAY:Notificaitons.getInstance().sendMediaStyleNotification(this,mNM,true);break;case MEDIA_STYLE_ACTION_NEXT:break;case MEDIA_STYLE_ACTION_DELETE:mNM.cancel(NOTIFICATION_MEDIA_STYLE);break;default://do nothing}}private void dealWithActionReplay(Intent intent) {Bundle result = RemoteInput.getResultsFromIntent(intent);if(result != null) {String content = result.getString(REMOTE_INPUT_RESULT_KEY);Log.i(TAG,"content = " + content);mNM.cancel(NOTIFICATION_REMOTE_INPUT);}}private void dealWithActionSendProgressNotification() {new Thread(new Runnable() {@Overridepublic void run() {for(int i=0 ; i<=100 ; i++) {Notificaitons.getInstance().sendProgressViewNotification(mContext,mNM,i);try {Thread.sleep(100);} catch (InterruptedException e) {e.printStackTrace();}}}}).start();}private void dealWithActionCustomHeadsUpView(Intent intent) {String headsUpOption = intent.getStringExtra(EXTRA_OPTIONS);Log.i(TAG,"heads up option = " + headsUpOption);if(headsUpOption == null) {return;}switch (headsUpOption) {case ACTION_ANSWER:mNM.cancel(NOTIFICATION_CUSTOM_HEADS_UP);break;case ACTION_REJECT:mNM.cancel(NOTIFICATION_CUSTOM_HEADS_UP);break;default://do nothing}}private NotificationContentWrapper getNotificationContent() {switch (mCurrentPosition) {case -1:mCurrentPosition = 2;break;case 3:mCurrentPosition = 0;break;default:// do nothing}return mContent.get(mCurrentPosition);} }

小結

本文給出了在Android 8.0版本中各種通知的寫法，各種設置的效果也做了比較詳細的注釋，可以根據具體需求自行組合，相信可以覆蓋絕大部分應用場景，想要了解更多可以參看文末參考文獻中給出的鏈接文章。

• Demo

參考文獻

Google Notification user guide
Android Notification 詳解
Android O Preview 之 通知渠道（Notification Channels）
Android notification .addAction deprecated in api 23
Android7.0 通知直接回復
如何使用Notification的相關Style實現不同類型的Notification
一起來學習Android 8.0系統的通知欄適配吧
解決PendingIntent傳遞參數為空的問題
Android--通知之Notification

總結

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