Android 9.0 飞行模式下禁用NFC 功能实现以及问题解决（二）

private NfcAdapter mAdapter;
static final int NFC_DISABLED                      = 0;
static final int NFC_ENABLED                       = 1;
private static final int NFC_DISABLED_AIRPLANE_ON          = 2;
private int mPersistNFCState = NFC_DISABLED;


@RequiresPermission(android.Manifest.permission.CONNECTIVITY_INTERNAL)
public void setAirplaneMode(boolean enable) {
    try {
        mService.setAirplaneMode(enable);
        if (!enable) {
            if (mPersistNFCState == NFC_DISABLED_AIRPLANE_ON) {
                getAdapter().enable();
            }
        } else {
            if (getAdapter().isEnabled()) {
                mPersistNFCState = NFC_DISABLED_AIRPLANE_ON; 
                getAdapter().disable();
            } else {
                mPersistNFCState = NFC_DISABLED;
                getAdapter().disable();
            }
        }
    } catch (RemoteException e) {
        throw e.rethrowFromSystemServer();
    }
}

private NfcAdapter getAdapter() {
    if (mAdapter == null) {
        try {
            mAdapter = NfcAdapter.getNfcAdapter(mContext);
        } catch (UnsupportedOperationException e) {
            mAdapter = null;
        }
    }
    return mAdapter;
}