您可以使用onNewIntent方法来处理NFC标签被移除的情况。以下是一个示例，它在NFC标签被检测到时会显示一个活动，并在NFC标签被移除时关闭该活动：

public class MainActivity extends AppCompatActivity {
    private NfcAdapter nfcAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        nfcAdapter = NfcAdapter.getDefaultAdapter(this);
    }

    @Override
    protected void onResume() {
        super.onResume();
        if (NfcAdapter.ACTION_NDEF_DISCOVERED.equals(getIntent().getAction())) {
            handleNfcIntent(getIntent());
        }
    }

    @Override
    protected void onNewIntent(Intent intent) {
        super.onNewIntent(intent);
        handleNfcIntent(intent);
    }

    private void handleNfcIntent(Intent intent) {
        // This is where you handle the NFC tag's data
        // For example, you can display the tag's data in a TextView

        // Close this activity when the NFC tag is removed
        if (intent.getAction().equals(NfcAdapter.ACTION_TAG_LOST)) {
            finish();
        }
    }
}