Systemui the NFC button in the drop-down menu the probability of disappearing

[Result Behavior]

There is a certain probability that the pull-down NFC icon disappears after rebooting

[Expected Behavior]

cause

The Systemui is initialized earlier than Nfcservice, and Systemui executes only once, Mnfcadapter = Nfcadapter.getdefaultadapter (Mcontext), executes prematurely and executes only once, If the initialization is performed in the download structure, it will remain empty.

So it will cause a certain probability to restart when nfctile is getting nfcacapter=null

However, the Nfcacapter does not display the NFC icon when empty, and if it does, it will cause a bug that cannot be clicked.

Ideas

Initialization cannot be performed with Systemui.

Modify Method

After the Nfcadapter initialization is performed on the next action, the specific in setlistening () gets