Notification（Android）消息推送機制

Notification有哪些功能作用呢

　　1）顯示接收的短信，消息（QQ，微信，新浪，愛奇藝等）

　　2）顯示客戶端的推送消息

　　3）顯示正在進行的事務（正在播放的音樂，下載進度條）

通知狀態欄主要涉及到兩個類，Notification、NotificationManager

Notification是通知消息類，它里面對應的通知欄的各種屬性

 

Notification使用步驟

　　<1>.得到通知管理者，因為NotificationManager是一個系統Service,所以需要通過getService得到

NotificationManager notificationManager= (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);

　　<2>.創建Notification

NotificationCompat.Builder builder=new NotificationCompat.Builder(this);

　　<3>.為Notification設置各種屬性

　　<4>.通過通知管理者NotificationManager發送通知

notificationManager.notify(0x101,notification);

　　<5>.刪除通知

notificationManager.cancel(NOTIFICATION_ID);

 

完整的代碼
1.創建對應的service

class TaskManageNotificationService extends Service {
                // 獲取消息線程
                private MessageThread messageThread = null;

                // 點擊查看
                private Intent messageIntent = null;
                private PendingIntent messagePendingIntent = null;

                // 通知欄消息
                private int messageNotificationID = 1000;
               // private Notification messageNotification = null;
                private NotificationManager messageNotificationManager = null;
                //實例化通知
                private NotificationCompat.Builder builder = null;

                public TaskManageNotificationService() {
                
                }

                @Override
                public IBinder onBind(Intent intent) {
                    return null;
                }

                @Override
                public int onStartCommand(Intent intent, int flags, int startId) {

                    //實例化通知管理器
                    messageNotificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
                   

                    messageIntent = new Intent(this, MainActivity.class);
                    messagePendingIntent = PendingIntent.getActivity(this, 0,
                            messageIntent, 0);

                    // 開啟線程
                    messageThread = new MessageThread();
                    messageThread.isRunning = true;
                    messageThread.start();

                    return super.onStartCommand(intent, flags, startId);
                }


                /**
                 * 從服務器端獲取消息
                 *
                 */
                class MessageThread extends Thread {
                    // 設置是否循環推送
                    public boolean isRunning = true;

                    public void run() {
                         while (isRunning) {
                            try {
                                // 間隔時間
                                Thread.sleep(1000);
                                // 獲取服務器消息
                                String serverMessage = getServerMessage();
                                if (serverMessage != null && !"".equals(serverMessage)) {
                                     //實例化通知
                                    builder = new NotificationCompat.Builder(this);
                                    builder.setContentTitle("新任務");//設置通知標題
                                    builder.setContentText("不要放孔明燈，容易起火");//設置通知內容
                                    builder.setDefaults(NotificationCompat.DEFAULT_ALL);//設置通知的方式，震動、LED燈、音樂等
                                    builder.setAutoCancel(true);//點擊通知后，狀態欄自動刪除通知
                                    builder.setSmallIcon(R.drawable.court_easyicon_9);//設置小圖標
                                    // 更新通知欄 設置通知內容
                                    builder.setContentText(serverMessage);
                                    //設置點擊通知后將要啟動的程序組件對應的PendingIntent
                                    builder.setContentIntent(messagePendingIntent);
                                    messageNotificationManager.notify(messageNotificationID,
                                            builder.build());
                                    // 每次通知完，通知ID遞增一下，避免消息覆蓋掉
                                    messageNotificationID++;
                                }
                            } catch (InterruptedException e) {
                                e.printStackTrace();
                            }
                         }
                    }
                }

                @Override
                public void onDestroy() {
                    // System.exit(0);
                    messageThread.isRunning = false;
                    super.onDestroy();
                }

                /**
                 * 模擬發送消息
                 *
                 * @return 返回服務器要推送的消息，否則如果為空的話，不推送
                 */
                public String getServerMessage() {
                    return "NEWS!";
                }
        }

2.在mainfeast.xml文件中配置Service

<service  android:name=".services.TaskManageNotificationService">
    <intent-filter>
        <action android:name="task_manage_notification"/>
    </intent-filter>
</service>    

3.使用創建的service

// 啟動service
Intent intent = new Intent();
intent.setAction("task_manage_notification");
startService(intent);

// 停止service
Intent intent = new Intent();
intent.setAction("task_manage_notification");
stopService(intent);