Android8.0通知栏不显示 Android8.0通知栏不显示

【Android8.0通知栏不显示】把targetSdkVersion改成26后通知栏不显示。
对于旧的代码，要修改两个地方

创建通知渠道
改用NotificationCompat

示例：

public class MainActivity extends AppCompatActivity {@Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) { String channelId = "chat"; String channelName = "聊天消息"; int importance = NotificationManager.IMPORTANCE_HIGH; createNotificationChannel(channelId, channelName, importance); channelId = "subscribe"; channelName = "订阅消息"; importance = NotificationManager.IMPORTANCE_DEFAULT; createNotificationChannel(channelId, channelName, importance); } }@TargetApi(Build.VERSION_CODES.O) private void createNotificationChannel(String channelId, String channelName, int importance) { NotificationChannel channel = new NotificationChannel(channelId, channelName, importance); NotificationManager notificationManager = (NotificationManager) getSystemService( NOTIFICATION_SERVICE); notificationManager.createNotificationChannel(channel); }public void sendChatMsg(View view) { NotificationManager manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE); Notification notification = new NotificationCompat.Builder(this, "chat") .setContentTitle("收到一条聊天消息") .setContentText("今天中午吃什么？") .setWhen(System.currentTimeMillis()) .setSmallIcon(R.mipmap.ic_launcher) .setLargeIcon(BitmapFactory.decodeResource(getResources(), R.mipmap.ic_launcher)) .setAutoCancel(true) .build(); manager.notify(1, notification); }public void sendSubscribeMsg(View view) { NotificationManager manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE); Notification notification = new NotificationCompat.Builder(this, "subscribe") .setContentTitle("收到一条订阅消息") .setContentText("地铁沿线30万商铺抢购中！") .setWhen(System.currentTimeMillis()) .setSmallIcon(R.mipmap.ic_launcher) .setLargeIcon(BitmapFactory.decodeResource(getResources(), R.mipmap.ic_launcher)) .setAutoCancel(true) .build(); manager.notify(2, notification); } }

源码：https://gitee.com/obarong/TestNotification-android
参考 Android通知栏微技巧，8.0系统中通知栏的适配 - 郭霖的专栏 - CSDN博客
https://blog.csdn.net/guolin_blog/article/details/79854070
android 实现Service上传并在通知栏显示进度条 -
https://www.jianshu.com/p/2d0a93d1e197