android通知栏消息

android 在通知栏弹出消息，看了很多博客，方到代码里都略有问题，最后只能去官方文档找示例。

官方文档

这个通知栏既可以通过service触发，也可以通过activity触发。

public class Notify {    private NotificationManager manager;    private Notification.Builder builder;    private Context context;    private Notification notification;    private String TAG = "notify";    public Notify(Context context){        this.context = context;    }   @TargetApi(26)    public void setNotification(String title, String desc){        manager = (NotificationManager)context.getSystemService(context.NOTIFICATION_SERVICE);        // set channel  chanenel的创建        String CHANNEL_ONE_ID = "com.zhangshiling.app";        String CHANNEL_ONE_NAME = "Channel One";        NotificationChannel notificationChannel;        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {            notificationChannel = new NotificationChannel(CHANNEL_ONE_ID,                    CHANNEL_ONE_NAME, NotificationManager.IMPORTANCE_HIGH);            /*notificationChannel.enableLights(true);            notificationChannel.setLightColor(Color.RED);            notificationChannel.setShowBadge(true);            notificationChannel.setLockscreenVisibility(Notification.VISIBILITY_PUBLIC);*/            NotificationManager nm = context.getSystemService(NotificationManager.class);            nm.createNotificationChannel(notificationChannel);        }        Intent intent = new Intent(context, message_list.class);       intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);        PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent, 0);        builder = new Notification.Builder(context).setContentTitle(title)                .setChannelId(CHANNEL_ONE_ID)                .setContentText(desc)                .setContentIntent(pendingIntent)                .setWhen(System.currentTimeMillis())                .setAutoCancel(true)                .setPriority(NotificationCompat.PRIORITY_DEFAULT)                .setVibrate(new long[]{0, 1000, 1000, 1000}) //通知栏消息震动                .setLights(Color.GREEN, 1000, 2000) //通知栏消息闪灯(亮一秒间隔两秒再亮)                .setDefaults(NotificationCompat.DEFAULT_ALL)                .setSmallIcon(R.drawable.small_icon);        Log.i(TAG,"after build a builder");        //manager.notify(1, builder.getNotification());        NotificationManagerCompat new_nm = NotificationManagerCompat.from(context);        new_nm.notify(1, builder.build());  // 第一个参数1具体实现时 需要修改 用于显示不同消息。        //return builder.getNotification();    }  }

在service中

 Notify nm = new Notify(this); nm.setNotification(rsp.title, rsp.content);

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