在片段中使用 onNewIntent(...) [英] Use onNewIntent(...) in a fragment
问题描述
我有问题.我想使用 onNewIntent(...)
和 getIntent(...)
方法.不幸的是片段不知道这个意图.如何在我的片段中使用此方法?这个片段应该能够读取 NFC 标签,所以我需要意图.我会很高兴收到答复.我提前谢谢你.你可以在下面看到我的代码.
I have a problem. I want to use a the method onNewIntent(...)
and getIntent(...)
.
Unfortunately the fragment do not know this intent. How can I use this method in my fragment?
This fragment should be able to read an NFC tag, so I need the intent.
I would be very happy to receive an answer. I thank you in advance. Below you can see my code.
public class UserFragmentGeldaufladen extends Fragment {
private Dialog epicDialog;
private NfcAdapter nfcAdapter;
private PendingIntent pendingIntent;
private boolean writeMode;
private IntentFilter writeTagFilters[];
private Context context;
private Tag myTag;
private interface RetrievalEventListener<T> {
abstract void onDataRetrieved(T t);
}
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_user_geldaufladen, container, false);
context = view.getContext();
epicDialog = new Dialog(view.getContext());
nfcAdapter = NfcAdapter.getDefaultAdapter(view.getContext());
if (nfcAdapter == null) {
// Stop here, we definitely need NFC
Toast.makeText(view.getContext(), "This device doesn't support NFC.", Toast.LENGTH_LONG).show();
}
// Error
readFromIntent(getIntent());
pendingIntent = PendingIntent.getActivity(this, 0, new Intent(context, getClass()).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP), 0);
IntentFilter tagDetected = new IntentFilter(NfcAdapter.ACTION_TAG_DISCOVERED);
tagDetected.addCategory(Intent.CATEGORY_DEFAULT);
return view;
}
private void readFromIntent(Intent intent) {
String action = intent.getAction();
if (NfcAdapter.ACTION_TAG_DISCOVERED.equals(action)
|| NfcAdapter.ACTION_TECH_DISCOVERED.equals(action)
|| NfcAdapter.ACTION_NDEF_DISCOVERED.equals(action)) {
Parcelable[] rawMsgs = intent.getParcelableArrayExtra(NfcAdapter.EXTRA_NDEF_MESSAGES);
NdefMessage[] msgs = null;
if (rawMsgs != null) {
msgs = new NdefMessage[rawMsgs.length];
for (int i = 0; i < rawMsgs.length; i++) {
msgs[i] = (NdefMessage) rawMsgs[i];
}
}
buildTagViews(msgs);
}
}
private void buildTagViews(NdefMessage[] msgs) {
if (msgs == null || msgs.length == 0) return;
String text = "";
// String tagId = new String(msgs[0].getRecords()[0].getType());
byte[] payload = msgs[0].getRecords()[0].getPayload();
String textEncoding = ((payload[0] & 128) == 0) ? "UTF-8" : "UTF-16"; // Get the Text Encoding
int languageCodeLength = payload[0] & 0063; // Get the Language Code, e.g. "en"
// String languageCode = new String(payload, 1, languageCodeLength, "US-ASCII");
try {
// Get the Text
text = new String(payload, languageCodeLength + 1, payload.length - languageCodeLength - 1, textEncoding);
} catch (UnsupportedEncodingException e) {
Log.e("UnsupportedEncoding", e.toString());
}
System.out.println(text);
}
// Error
@Override
protected void onNewIntent(Intent intent) {
super.onNewIntent(intent);
setIntent(intent);
readFromIntent(intent);
if (NfcAdapter.ACTION_TAG_DISCOVERED.equals(intent.getAction())) {
myTag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
}
}
@Override
public void onPause(){
super.onPause();
WriteModeOff();
}
@Override
public void onResume(){
super.onResume();
WriteModeOn();
}
private void WriteModeOn(){
writeMode = true;
nfcAdapter.enableForegroundDispatch((Activity) context, pendingIntent, writeTagFilters, null);
}
/******************************************************************************
**********************************Disable Write*******************************
******************************************************************************/
private void WriteModeOff(){
writeMode = false;
nfcAdapter.disableForegroundDispatch((Activity) context);
}
}
推荐答案
您可以将 getIntent()
与 Fragments 一起使用,但您需要先调用 getActivity()
.像 getActivity().getIntent()...
这样的东西可以工作.
You can use a getIntent()
with Fragments but you need to call getActivity()
first. Something like getActivity().getIntent()...
could work.
这篇关于在片段中使用 onNewIntent(...)的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!