打开android8.0的通知渠道权限页面

Intent channelIntent =new Intent(Settings.ACTION_CHANNEL_NOTIFICATION_SETTINGS);

channelIntent.putExtra(Settings.EXTRA_APP_PACKAGE, context.getPackageName());

channelIntent.putExtra(Settings.EXTRA_CHANNEL_ID, Constant.CHANNELID);//渠道id必须是我们之前注册的

context.startActivity(channelIntent);