Android开发：第一行代码问题解决--前台服务

遇到的问题：运行程序后，系统通知不显示，出现“Developer warning for package "my_package_name" Failed to post notification on ...”提示

 

解决办法：

1. 将 app/build.gradle 中 minSdkVersion 改为26

2. 将代码改为：

        Intent intent=new Intent(this,MainActivity.class);
        PendingIntent pi=PendingIntent.getActivity(this,0,intent,0);

        String CHANNEL_ID = "1";
        String CHANNEL_Name = "channel_name";
        NotificationChannel channel = new NotificationChannel(CHANNEL_ID, CHANNEL_Name, NotificationManager.IMPORTANCE_HIGH);
        NotificationManager manager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        manager.createNotificationChannel(channel);

        Notification.Builder builder = new Notification.Builder(this,CHANNEL_ID);
        builder.setContentTitle("This is content file");
        builder.setContentText("This is content text");
        builder.setWhen(System.currentTimeMillis());
        builder.setSmallIcon(R.mipmap.ic_launcher);
        builder.setLargeIcon(BitmapFactory.decodeResource(getResources(),R.mipmap.ic_launcher));
        builder.setChannelId(CHANNEL_ID);
        builder.setContentIntent(pi);
        Notification notification = builder.build();
        startForeground(1,notification);

参考链接： android8.0 通知适配（NotificationChannel）