ANDROID 一个app中有多个activity读取NFC标签问题

最近在写有关NFC标签读取录入的android APP。由于在AndroidManifest.xml配置使得NFC可以自启动对应activity，但APP中好多activity都需要NFC标签进行读取，这时activity的启动就出现了问题。
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• 最初代码如下

activity中获取NFC标签的id号：

    @Override    protected void onNewIntent(Intent intent) {        super.onNewIntent(intent);        if (NfcAdapter.ACTION_NDEF_DISCOVERED.equals(intent.getAction())// NDEF类型        || NfcAdapter.ACTION_TECH_DISCOVERED.equals(intent.getAction())// 其他类型        ||NfcAdapter.ACTION_TAG_DISCOVERED.equals(intent.getAction())) {            Toast.makeText(this,byteArrayToHexString(intent.getByteArrayExtra(NfcAdapter.EXTRA_ID)), Toast.LENGTH_LONG).show();        }    }

AndroidManifest中配置：

        <activity            android:name=""            android:theme="@style/Theme.AppCompat.Light.NoActionBar"            android:launchMode="singleInstance">            <intent-filter>                <action android:name="android.nfc.action.TECH_DISCOVERED" />            </intent-filter>            <intent-filter>                <action android:name="android.nfc.action.TAG_DISCOVERED" />                <category android:name="android.intent.category.DEFAULT" />            </intent-filter>            <meta-data                android:name="android.nfc.action.TECH_DISCOVERED"                android:resource="@xml/nfc_tech_filter" />        </activity>

新建nfc_tech_filter.xml配置：

<?xml version="1.0" encoding="utf-8"?><resources xmlns:xliff="urn:oasis:names:tc:xliff:document:1.2">    <tech-list>        <tech>android.nfc.tech.IsoDep</tech>    </tech-list>    <tech-list>        <tech>android.nfc.tech.NfcV</tech>    </tech-list>    <tech-list>        <tech>android.nfc.tech.NfcF</tech>    </tech-list></resources>

到此就可以获得NFC标签的ID了，但问题是我好多activity配置完后每次刷NFC卡总是会将在AndroidManifest中配置的第一个带有NFC配置的activity打开，而不是在当前activity读取NFC标签。之后做了如下修改，将次问题解决：

1.删掉AndroidManifest对应activity配置：

2.将xxxx activity写为：

public class xxxx  extends Activity {    private NfcAdapter mAdapter;    private PendingIntent mPendingIntent;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.xxxxx);        mAdapter = NfcAdapter.getDefaultAdapter(this);        mPendingIntent = PendingIntent.getActivity(this, 0, new Intent(this, getClass()).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP), 0);    }    @Override    protected void onResume() {        super.onResume();        //Enable forground dispatching to get the tags        mAdapter.enableForegroundDispatch(this, mPendingIntent, null, null); //ended up setting mFilters and mTechLists to null    }    @Override    public void onPause() {        super.onPause();        //You need to disable forgroundDispatching here        mAdapter.disableForegroundDispatch(this);    }    @Override    protected void onNewIntent(Intent intent) {        super.onNewIntent(intent);        if (NfcAdapter.ACTION_NDEF_DISCOVERED.equals(intent.getAction())// NDEF类型        || NfcAdapter.ACTION_TECH_DISCOVERED.equals(intent.getAction())// 其他类型        ||NfcAdapter.ACTION_TAG_DISCOVERED.equals(intent.getAction())) {           cardIdEditText.setText(byteArrayToHexString(intent.getByteArrayExtra(NfcAdapter.EXTRA_ID)));        }    }}

问题解决。