你好我想从NFC标签读取。但我得到一个例外。

Hi I am trying to read from NFC Tag. But I am getting an exception.

我已经把这个条件来检测标签？

I have put this condition to detect the tag?

if(NfcAdapter.ACTION_TAG_DISCOVERED != null)

无论这个条件是正确的？

Whether this condition is correct?

推荐答案

要回答你的问题有关code -

To answer you question about the code -

这将永远是真实的 - NfcAdapter.ACTION_TAG_DISCOVERED 是一个恒定值 - 你需要使用：

That will always be true - NfcAdapter.ACTION_TAG_DISCOVERED is a constant value - you need to use:

getIntent().getAction().equals(NfcAdapter.ACTION_TAG_DISCOVERED) 

要进行比较。

不过，这可能无关，与你的例外 -

But, that probably has nothing to do with your exception -