Android 8.0发送通知

在Android8.0以后，针对Notification 通知api做了修改，新增了通知渠道（NotificationCannel)。下面就把demo的详细代码记录下：
1.Application 为NotificationManager添加通知频道

import android.app.Application;

import com.xinrui.ndkapp.notification.NotificationChannels;

public class NdkApplication extends Application {
    @Override
    public void onCreate() {
        super.onCreate();
        NotificationChannels.createAllNotificationChannels(this);
    }
}

2.NotificationChannels 类

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.app_name),
                NotificationManager.IMPORTANCE_DEFAULT);
        mediaChannel.setSound(null,null);
        mediaChannel.setVibrationPattern(null);

        nm.createNotificationChannels(Arrays.asList(
                new NotificationChannel(
                        CRITICAL,
                        context.getString(R.string.app_name),
                        NotificationManager.IMPORTANCE_HIGH),
                new NotificationChannel(
                        IMPORTANCE,
                        context.getString(R.string.app_name),
                        NotificationManager.IMPORTANCE_DEFAULT),
                new NotificationChannel(
                        DEFAULT,
                        context.getString(R.string.app_name),
                        NotificationManager.IMPORTANCE_LOW),
                new NotificationChannel(
                        LOW,
                        context.getString(R.string.app_name),
                        NotificationManager.IMPORTANCE_MIN),
                //custom notification channel
                mediaChannel
        ));
    }
}

4.发送通知

public void sendSimpleNotification(Context context, NotificationManager nm) {
        //创建点击通知时发送的广播
        Intent intent = new Intent(context, NotificationMonitorService.class);
        intent.setAction("android.service.notification.NotificationListenerService");
        PendingIntent pi = PendingIntent.getService(context,0,intent,0);
        //创建删除通知时发送的广播
        Intent deleteIntent = new Intent(context,NotificationMonitorService.class);
        deleteIntent.setAction(Intent.ACTION_DELETE);
        PendingIntent deletePendingIntent = PendingIntent.getService(context,0,deleteIntent,0);
        //创建通知
        Notification.Builder nb = new Notification.Builder(context, NotificationChannels.DEFAULT)
                //设置通知左侧的小图标
                .setSmallIcon(R.drawable.ic_notification)
                //设置通知标题
                .setContentTitle("Simple notification")
                //设置通知内容
                .setContentText("Demo for simple notification!")
                //设置点击通知后自动删除通知
                .setAutoCancel(true)
                //设置显示通知时间
                .setShowWhen(true)
                //设置通知右侧的大图标
                .setLargeIcon(BitmapFactory.decodeResource(context.getResources(),R.drawable.ic_notifiation_big))
                //设置点击通知时的响应事件
                .setContentIntent(pi)
                //设置删除通知时的响应事件
                .setDeleteIntent(deletePendingIntent);
        //发送通知
        nm.notify(Notificaitons.NOTIFICATION_SAMPLE,nb.build());
    }