我正在尝试制作一个带有NFC功能的应用程序。问题在于当发现NFC标签时,挂起意图始终会创建一个已存在的新活动。我正在使用选项卡主机。 如何在不创建新活动的情况下创建挂起意图。 非常感谢。
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mNfcAdapter = NfcAdapter.getDefaultAdapter(this);
mNfcPendingIntent = PendingIntent.getActivity(this, 0,new Intent(this,
getClass()).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP), 0);
}
protected void onResume() {
super.onResume();
mResumed = true;
// Sticky notes received from Android
if (NfcAdapter.ACTION_NDEF_DISCOVERED.equals(getIntent().getAction())) {
NdefMessage[] messages = getNdefMessages(getIntent());
byte[] payload = messages[0].getRecords()[0].getPayload();
try { cekNfc(new String(payload)); }
catch (SQLException e) { e.printStackTrace(); }
catch (NoSuchAlgorithmException e) { e.printStackTrace(); }
catch (UnsupportedEncodingException e) { e.printStackTrace(); }
setIntent(new Intent());
}
enableNdefExchangeMode();
}
private void enableNdefExchangeMode() { mNfcAdapter.enableForegroundDispatch(this, mNfcPendingIntent, mNdefExchangeFilters, null); }
NdefMessage[] getNdefMessages(Intent intent) { // Parse the intent
NdefMessage[] msgs = null;
String action = intent.getAction();
//jika ada action
if (NfcAdapter.ACTION_TAG_DISCOVERED.equals(action) || NfcAdapter.ACTION_NDEF_DISCOVERED.equals(action)) {
Parcelable[] rawMsgs = intent.getParcelableArrayExtra(NfcAdapter.EXTRA_NDEF_MESSAGES);
if (rawMsgs != null) {
msgs = new NdefMessage[rawMsgs.length];
for (int i = 0; i < rawMsgs.length; i++) { msgs[i] = (NdefMessage) rawMsgs[i]; }
}
}
return msgs;
}
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mNfcAdapter = NfcAdapter.getDefaultAdapter(this);
mNfcPendingIntent = PendingIntent.getActivity(this, 0,new Intent(this,
getClass()).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP), 0);
}
protected void onResume() {
super.onResume();
mResumed = true;
// Sticky notes received from Android
if (NfcAdapter.ACTION_NDEF_DISCOVERED.equals(getIntent().getAction())) {
NdefMessage[] messages = getNdefMessages(getIntent());
byte[] payload = messages[0].getRecords()[0].getPayload();
try { cekNfc(new String(payload)); }
catch (SQLException e) { e.printStackTrace(); }
catch (NoSuchAlgorithmException e) { e.printStackTrace(); }
catch (UnsupportedEncodingException e) { e.printStackTrace(); }
setIntent(new Intent());
}
enableNdefExchangeMode();
}
private void enableNdefExchangeMode() { mNfcAdapter.enableForegroundDispatch(this, mNfcPendingIntent, mNdefExchangeFilters, null); }
NdefMessage[] getNdefMessages(Intent intent) { // Parse the intent
NdefMessage[] msgs = null;
String action = intent.getAction();
//jika ada action
if (NfcAdapter.ACTION_TAG_DISCOVERED.equals(action) || NfcAdapter.ACTION_NDEF_DISCOVERED.equals(action)) {
Parcelable[] rawMsgs = intent.getParcelableArrayExtra(NfcAdapter.EXTRA_NDEF_MESSAGES);
if (rawMsgs != null) {
msgs = new NdefMessage[rawMsgs.length];
for (int i = 0; i < rawMsgs.length; i++) { msgs[i] = (NdefMessage) rawMsgs[i]; }
}
}
return msgs;
}
mNdefExchangeFilters
的? - NFC guynull
?null
的值将充当通配符,匹配所有内容。我不确定空列表的结果是什么。也许它会导致不匹配任何内容,因此结果会绕过前台调度。 - NFC guy