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。
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();
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)));
}
}
}
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