Bonjour,

J'ai un petit souci.
J'ai plusieurs activités qui héritent d'une classe abstraite (c'est pour faire de la lecture NFC).
Voici le code de l'activité:
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public class simple_Activity extends BaseActivityRfidScan {
 
 
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        ActionBar actionBar = getSupportActionBar();
        //ActionBar actionBar = null;
        setContentView(R.layout.simple_Activity);
        Bundle b = getIntent().getExtras();
        String value = "";
 
         if(b != null)
La classe abstraite:

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public abstract class BaseActivityRfidScan extends AppCompatActivity {
//public abstract class BaseActivityRfidScan extends Activity {
 
 
 
 
 
 
    @Override
    public void onCreate(Bundle savedInstanceState) {
        ActionBar actionBar = getSupportActionBar();
        MyContext=this.getApplicationContext();
        super.onCreate(savedInstanceState);
        setContentView(getLayoutResourceId());
        grey=ContextCompat.getDrawable(this, R.drawable.nfc_grey).getConstantState();
        mp = MediaPlayer.create(this, R.raw.jackpot);
        first_cycle=true;
        // Check if NFC is supported and enabled
        nfcAdapter = NfcAdapter.getDefaultAdapter(this);
        try {
            //Log.d("NFC supporté", (Boolean.toString(nfcAdapter != null)));
            if (nfcAdapter!=null) {
                //Log.d("NFC activé", (Boolean.toString(nfcAdapter.isEnabled())));
            }
        } finally {
 
         }
        //Log.d("on create firstcycle", first_cycle.toString());
        nfcPendingIntent = PendingIntent.getActivity(this, 0,
                new Intent(this, getClass()).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP), 0);
 
        b = getIntent().getExtras();
        numbertags = b.getInt("numbertags");
        String value="";
 
            value = b.getString("title");
        //Log.d("title:", value);
        TextView title = (TextView) findViewById(R.id.title);
        Log.d("title text view:", title.toString());
        title.setText(value);
        value = b.getString("comment");
        TextView comment = (TextView) findViewById(R.id.comment);
        if (comment!=null){comment.setText(value);}
        value = b.getString("picture");
        ImageView picture = (ImageView) findViewById(R.id.picture);
        if (picture!=null){
            int resourceID = getResources().getIdentifier(
                    value,
                    "drawable",
                    getPackageName()
            );
            picture.setImageResource(resourceID);
 
        }
 
        if (actionBar != null) {
            actionBar.setHomeButtonEnabled(true);
            actionBar.setDisplayHomeAsUpEnabled(true);
            actionBar.setDisplayShowTitleEnabled(true);
            actionBar.setTitle("activité");
          }
 
        nfcgreen = getResources().getIdentifier(
                "nfc_green",
                "drawable",
                getPackageName()
        );
        nfcgray= getResources().getIdentifier(
                "nfc_grey",
                "drawable",
                getPackageName()
        );
 
    }
 
    private void resolveIntent(Intent intent) {
        if (intent.getAction().equals(NfcAdapter.ACTION_TAG_DISCOVERED)) {
            int value_task = b.getInt("task_number");
            EventBus.getDefault().post(new EventNfcDetect(intent.getByteArrayExtra(NfcAdapter.EXTRA_ID),value_task));
        }
    }
 
 
    @Override
    public void onNewIntent(Intent intent) {
        super.onNewIntent(intent);
        setIntent(intent);
        Log.d("NFC", "découvert");
        if (intent != null)
        {
            resolveIntent(intent);
        }
 
    }
 
    @Override
    protected void onResume() {
        super.onResume();
        mem_sound=false;
        if (nfcAdapter!=null) {
            nfcAdapter.enableForegroundDispatch(this, nfcPendingIntent, null, null);
        }
        EventBus.getDefault().register(this);
        timer = new Timer();
        timer.scheduleAtFixedRate(new TimerTask() {
            @Override
            public void run() {
                int valueint = b.getInt("db_offset");
                //Log.d("receive test",Integer.toString(valueint));
                EventBus.getDefault().post(new EventTaskReadRequest(valueint));
            }
        }, 0, 150);
 
 
 
    }
 
 
 
    @Override
    protected void onPause() {
        if (timer!=null){
            timer.cancel();
            timer=null;
        }
 
        super.onPause();
        if (nfcAdapter != null) {
            nfcAdapter.disableForegroundDispatch(this);
            EventBus.getDefault().unregister(this);
        }
        //Log.d("on pause firstcycle", first_cycle.toString());
    }
 
 
 
 
   public void play_sound(){
       Log.d("stop_!!","stop");
        if (mem_sound){
            //Log.d("stop_soud!!","stop");
            mp.stop();
       }
        else{
            mp.start();
            mem_sound=true;
        }
    }
 
    protected abstract int getLayoutResourceId();
 
    public boolean GetBit(byte thebyte, int position)
    {
        return (1 == ((thebyte >> position) & 1));
    }
 
 
    public static String bytesToHex(byte[] bytes) {
        char[] hexChars = new char[bytes.length * 2];
        for (int j = 0; j < bytes.length; j++) {
            int v = bytes[j] & 0xFF;
            hexChars[j * 2] = HEX_ARRAY[v >>> 4];
            hexChars[j * 2 + 1] = HEX_ARRAY[v & 0x0F];
        }
        return new String(hexChars);
    }
 
 
 
    public void onEvent(SendResultNfc event) {
        if (event != null) {
            int i=1;
 
            //Log.d("on event firstcycle", first_cycle.toString());
            // code à améliorer pour factoriser
            while(i<=numbertags){
                switch (i){
                    case 1: ImageView nfc1 = (ImageView) findViewById(R.id.rfid1);
                            if (GetBit(event.getMyResultNfc(),0)){
                                if(grey==nfc1.getDrawable().getConstantState() && !first_cycle){
                                    play_sound();
                                }
                                nfc1.setImageResource(nfcgreen);
                            } else
                            {
                                nfc1.setImageResource(nfcgray);
                            }
                            break;
 
                    case 2: ImageView nfc2 = (ImageView) findViewById(R.id.rfid2);
                        if (GetBit(event.getMyResultNfc(),1)){
                            if(grey==nfc2.getDrawable().getConstantState() && !first_cycle){
                                play_sound();
                            }
                            nfc2.setImageResource(nfcgreen);
                        } else
                        {
                            nfc2.setImageResource(nfcgray);
                        }
                        break;
 
                    case 3: ImageView nfc3 = (ImageView) findViewById(R.id.rfid3);
                        if (GetBit(event.getMyResultNfc(),2)){
                            if(grey==nfc3.getDrawable().getConstantState() && !first_cycle){
                                play_sound();
                            }
                            nfc3.setImageResource(nfcgreen);
                        } else
                        {
                            nfc3.setImageResource(nfcgray);
                        }
                        break;
 
                    case 4: ImageView nfc4 = (ImageView) findViewById(R.id.rfid4);
                        if (GetBit(event.getMyResultNfc(),3)){
                            if(grey==nfc4.getDrawable().getConstantState()&& !first_cycle){
                                play_sound();
                            }
                            nfc4.setImageResource(nfcgreen);
                        } else
                        {
                            nfc4.setImageResource(nfcgray);
                        }
                        break;
 
                    case 5: ImageView nfc5 = (ImageView) findViewById(R.id.rfid5);
                        if (GetBit(event.getMyResultNfc(),4)){
                            if(grey==nfc5.getDrawable().getConstantState()&& !first_cycle){
                                play_sound();
                            }
                            nfc5.setImageResource(nfcgreen);
                        } else
                        {
                            nfc5.setImageResource(nfcgray);
                        }
                        break;
 
                    case 6: ImageView nfc6 = (ImageView) findViewById(R.id.rfid6);
                        if (GetBit(event.getMyResultNfc(),5)){
                            if(grey==nfc6.getDrawable().getConstantState()&& !first_cycle){
                                play_sound();
                            }
                            nfc6.setImageResource(nfcgreen);
                        } else
                        {
                            nfc6.setImageResource(nfcgray);
                        }
                        break;
 
                    case 7: ImageView nfc7 = (ImageView) findViewById(R.id.rfid7);
                        if (GetBit(event.getMyResultNfc(),6)){
                            if(grey==nfc7.getDrawable().getConstantState()&& !first_cycle){
                                play_sound();
                            }
                            nfc7.setImageResource(nfcgreen);
                        } else
                        {
                            nfc7.setImageResource(nfcgray);
                        }
                        break;
 
                    default: break;
                }
                i+=1;
            }
            if (GetBit(event.getMyResultScan(),0)){
                Log.d("rfid", "connu " + this.getClass().getName());
                Log.d("rfid", "connu " + this.getApplicationContext().getPackageName());
                Toast.makeText(this, "connu ", Toast.LENGTH_SHORT).show();
 
            }
 
            if (GetBit(event.getMyResultScan(),1)){
                Log.d("rfid", "inconnu " + this.getClass().getName());
                Log.d("rfid", "connu " + this.getApplicationContext().getPackageName());
 
                Toast.makeText(this, "inconnu ", Toast.LENGTH_SHORT).show();
 
            }
 
        }
        first_cycle=false;
 
    }
}


et voici l'erreur:
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 Could not dispatch event: class com.example.mid1_v1.SendResultNfc to subscribing class class com.example.mid1_v1.simple_Activity
    java.lang.RuntimeException: Can't toast on a thread that has not called Looper.prepare()
J'ai l'impression que c'est le contexte qui ne va pas mais j'ai du mal...
Merci pour votre aide.