Android开发 - Notification的使用

• 本博客例子来自-Project-FoodList

Android 8.0 新特性

• Android 8.0 新特性
• NotificationChannel是android8.0新增的特性，如果App的targetSDKVersion >= 26，没有设置channel通知渠道的话，就会导致通知无法展示。
• NotificationChannel 官方示例

  private void createNotificationChannel() {
      // Create the NotificationChannel, but only on API 26+ because
      // the NotificationChannel class is new and not in the support library
      if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
          CharSequence name = getString(R.string.channel_name);
          String description = getString(R.string.channel_description);
          int importance = NotificationManager.IMPORTANCE_DEFAULT;
          NotificationChannel channel = new NotificationChannel(CHANNEL_ID, name, importance);
          channel.setDescription(description);
          // Register the channel with the system; you can't change the importance
          // or other notification behaviors after this
          NotificationManager notificationManager = getSystemService(NotificationManager.class);
          notificationManager.createNotificationChannel(channel);
      }
  }
  

Example

• 创建Notification代码

  private void createNotification(Context context, Collection item) {
  
      Intent myIntent = new Intent(context, DetailActivity.class);
      // 实例化一个Bundle
      Bundle myBundle = new Bundle();
      // 把item数据放入到bundle中
      myBundle.putSerializable("item", item);
      //把bundle放入intent里
      myIntent.putExtra("Message", myBundle);
      PendingIntent myPendingIntent = PendingIntent.getActivity(context, 0, myIntent, PendingIntent.FLAG_CANCEL_CURRENT);
  
      String id = "channel_id_0";
      String name="channel_name_0";
      //获取状态通知栏管理
      NotificationManager manager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
      Notification notify = null;
      
  	// SDK >= 26
      if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
          NotificationChannel mChannel = new NotificationChannel(id, name, NotificationManager.IMPORTANCE_HIGH);
          mChannel.enableVibration(true);
          mChannel.setVibrationPattern(new long[]{0,100,0}); // 震动
          manager.createNotificationChannel(mChannel);
          NotificationCompat.Builder builder = new NotificationCompat.Builder(context);
          //对Builder进行配置，此处仅选取了几个
          builder.setContentTitle("今日推荐")   //设置通知栏标题
                  .setChannelId(id)
                  .setContentText(item.getFoodName())   //设置通知栏显示内容
                  .setSmallIcon(R.mipmap.empty_star)   //设置通知小ICON（通知栏），可以用以前的素材，例如空星
                  .setWhen(System.currentTimeMillis())
                  .setShowWhen(true)
                  .setContentIntent(myPendingIntent);
          notify = builder.build();
      }
      else {
      	// SDK <= 26
          Notification.Builder builder = new Notification.Builder(context);
          //对Builder进行配置，此处仅选取了几个
          builder.setContentTitle("今日推荐")   //设置通知栏标题
                  .setContentText(item.getFoodName())   //设置通知栏显示内容
                  .setSmallIcon(R.mipmap.empty_star)   //设置通知小ICON（通知栏），可以用以前的素材，例如空星
                  .setContentIntent(myPendingIntent);
          //builder.setVibrate(new long[]{100,50,100});  // 设置震动
          notify = builder.build();
      }
      notify.flags =  Notification.FLAG_AUTO_CANCEL; // 点击一次后消失
      manager.notify(0, notify);
  }
  

• 效果展示