當我啓動NFC功能時，我的應用一直在崩潰

Question

我正在研究一個應用，該應用將接收來自標記的輸入並將值插入特定變量（仍在工作）。但是，當我在手機附近放置預設的NFC標籤時，應用程序會從標籤中獲取信息。相反，它會啓動應用程序，然後立即崩潰。

`公共類NFCAdding延伸活動{

private static final String TAG = "MealPlan"; 
private EditText foodName, protValue, carbValue, fatValue, energyValue; 
private Button addBreak, addLunch, addDinner; 
NfcAdapter mNfcAdapter; 

private boolean mResumed = false; 

PendingIntent mNfcPendingIntent; 
IntentFilter[] mNdefExchangeFilters; 

@Override 
public void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.nfc_add); 

    foodName = (EditText)findViewById(R.id.nfc_food_name); 
    protValue = (EditText)findViewById(R.id.nfc_prot_value); 
    carbValue = (EditText)findViewById(R.id.nfc_carb_value); 
    fatValue = (EditText)findViewById(R.id.nfc_fat_value); 
    energyValue = (EditText)findViewById(R.id.nfc_energy_value); 
    addBreak = (Button)findViewById(R.id.nfc_add_breakfast); 
    addLunch = (Button)findViewById(R.id.nfc_add_lunch); 
    addDinner = (Button)findViewById(R.id.nfc_add_dinner); 

    mNfcPendingIntent = PendingIntent.getActivity(this, 0, 
      new Intent(this, getClass()).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP), 0); 

    // Intent filters for reading a note from a tag or exchanging over p2p. 
    IntentFilter ndefDetected = new IntentFilter(NfcAdapter.ACTION_NDEF_DISCOVERED); 
    try { 
     ndefDetected.addDataType("text/plain"); 
    } catch (MalformedMimeTypeException e) { } 
    mNdefExchangeFilters = new IntentFilter[] { ndefDetected }; 

    addBreak.setOnClickListener(new Button.OnClickListener(){ 
     public void onClick(View v) { 
      Intent intent = new Intent(); 
    intent.setClass(getApplicationContext(), AddItem.class); 
    startActivity(intent); 
    finish();            
    } 

}）;

addLunch.setOnClickListener(new Button.OnClickListener(){ 
    public void onClick(View v) { 
      Intent intent = new Intent(); 
    intent.setClass(getApplicationContext(), LunchAdd.class); 
    startActivity(intent); 
    finish();            
    } 

}）;

addDinner.setOnClickListener(new Button.OnClickListener(){ 
    public void onClick(View v) { 
      Intent intent = new Intent(); 
    intent.setClass(getApplicationContext(), DinnerAdd.class); 
    startActivity(intent); 
    finish();            
    } 

}）;

} 

@Override 
    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(); 
      setNoteBody(new String(payload)); 
      setIntent(new Intent()); // Consume this intent. 
     } 
     enableNdefExchangeMode(); 
    } 

private void setNoteBody(String body) { 
     Editable text = foodName.getText(); 
     text.clear(); 
     text.append(body); 
    } 

private void enableNdefExchangeMode() { 
     mNfcAdapter.enableForegroundDispatch(this, mNfcPendingIntent, mNdefExchangeFilters, null); 
    } 

    private void disableNdefExchangeMode() { 
     mNfcAdapter.disableForegroundDispatch(this); 
    } 

NdefMessage[] getNdefMessages(Intent intent) { 
    // Parse the intent 
    NdefMessage[] msgs = null; 
    String action = intent.getAction(); 
    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]; 
      } 
     } else { 
      // Unknown tag type 
      byte[] empty = new byte[] {}; 
      NdefRecord record = new NdefRecord(NdefRecord.TNF_UNKNOWN, empty, empty, empty); 
      NdefMessage msg = new NdefMessage(new NdefRecord[] { 
       record 
      }); 
      msgs = new NdefMessage[] { 
       msg 
      }; 
     } 
    } else { 
     Log.d(TAG, "Unknown intent."); 
     finish(); 
    } 
    return msgs; 
} 

}`

Answer 1

按你的日誌下面的一個不是的EditText，但它是一個TextView：

foodName = (EditText)findViewById(R.id.nfc_food_name); 
protValue = (EditText)findViewById(R.id.nfc_prot_value); 
carbValue = (EditText)findViewById(R.id.nfc_carb_value); 
fatValue = (EditText)findViewById(R.id.nfc_fat_value); 
energyValue = (EditText)findViewById(R.id.nfc_energy_value); 

檢查與IDS nfc_food_name, nfc_prot_value, nfc_carb_value, nfc_fat_value and nfc_energy_value元素。它看起來像一個或多個TextView不是EditText ..