如何將所有 If 語句僅放在一個類或函數中？

Question

我的代碼中有很多 if 語句，是否可以創建一個函數或列表並將它們全部包含在其中？

我想總結一下這些 if 以減少我的代碼長度，以便我以后可以輕松更改它。 每次改變它都很難進入。 擁有一個包含所有這些 if 的大函數會更容易，然后我可以在添加新事件時操作它們。 有人可以幫我嗎？

public class MainActivity extends AppCompatActivity {

    public static final String ERROR_DETECTED = "No NFC tag detected!";
    public static final String WRITE_SUCCESS = "Text written to the NFC tag successfully!";
    public static final String WRITE_ERROR = "Error during writing, is the NFC tag close enough to your device?";
    NfcAdapter nfcAdapter;
    PendingIntent pendingIntent;
    IntentFilter writeTagFilters[];
    boolean writeMode;
    Tag myTag;
    Context context;

    Button btnWrite;
    View D1,D2,D3,D4,Autoprotection,Etat_centrale,Capot,Alimentation,PP4;
    TextView tvNFCContent,message, nfc_annoce, CompteurTelecommandes,Conseil_detecteur,text_centrale,Telecommande_centrale,Titre_systeme,Titre_telecommande,Nbre_defauts4,Defauts_capot,Defauts_pion;
    ImageView back,Batterie;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main );
        getSupportActionBar().setDisplayHomeAsUpEnabled(true);

        context = this;

        tvNFCContent =  findViewById(R.id.contenu);
        message = findViewById(R.id.ecriture);
        PP4 =findViewById(R.id.pp4);
        btnWrite = findViewById(R.id.ecrire_nfc);

        Etat_centrale = findViewById(R.id.etat_final);
        D1 = findViewById(R.id.detecteur_1);
        D2 = findViewById(R.id.detecteur_2);
        D3 = findViewById(R.id.detecteur_3);
        D4 = findViewById(R.id.detecteur_4);
        Alimentation = findViewById(R.id.alimentation);
        Autoprotection = findViewById(R.id.tamper);
        Capot = findViewById(R.id.capot);
        Batterie = findViewById(R.id.batterie);
        Telecommande_centrale= findViewById(R.id.telecommande_inconnu);
        Defauts_capot=findViewById(R.id.defaut_capot);
        Defauts_pion=findViewById(R.id.defaut_tamper);
        CompteurTelecommandes=findViewById(R.id.compteur_télecommande);
        Conseil_detecteur=findViewById(R.id.conseil);
        text_centrale=findViewById(R.id.centrale_text);
        Titre_systeme=findViewById(R.id.titre_systeme);
        Titre_telecommande=findViewById(R.id.titre_telecommande);


        // Mode_alimentation = findViewById(R.id.mode_alim);
        //Telecommande_arret = findViewById(R.id.telecommande_arret);
        //Telecommande_trame= findViewById(R.id.telecommande_trame);
        //Telecommande_centrale= findViewById(R.id.telecommande_centrale);
        //Nbre_defauts1= findViewById(R.id.nbre_defauts1);
        //Nbre_defauts2= findViewById(R.id.nbre_defauts2);
        //Nbre_defauts3= findViewById(R.id.nbre_defauts3);
        //Nbre_defauts4= findViewById(R.id.nbre_defauts4);

        PP4.setVisibility(View.GONE);
        nfc_annoce = findViewById(R.id.textView4);
        nfc_annoce.setVisibility(View.VISIBLE);
        back=findViewById(R.id.Reader);
        back.setVisibility(View.VISIBLE);
        CompteurTelecommandes.setVisibility(View.GONE);
        Conseil_detecteur.setVisibility(View.GONE);
        text_centrale.setVisibility(View.GONE);
        Titre_telecommande.setVisibility(View.GONE);
        Titre_systeme.setVisibility(View.GONE);

        D1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View a) {
                Toast toast = new Toast(getApplicationContext());
                toast.setGravity(Gravity.CENTER,0,-150);
                TextView tv = new TextView (MainActivity.this) ;
                tv.setBackgroundResource(R.color.blanc);
                tv.setTextColor(Color.BLACK);
                tv.setTextSize(15);
                tv.setText("Détecteur 1"
                );
                Typeface t = Typeface.create( "serif", Typeface.NORMAL);
                tv.setTypeface(t);
                tv.setPadding(50, 50,50,50);
                toast.setView(tv);
                toast.show();
            }
        });
        D2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View b) {

                Toast toast = new Toast(getApplicationContext());
                toast.setGravity(Gravity.CENTER,0,-150);
                TextView tv = new TextView (MainActivity.this) ;
                tv.setBackgroundResource(R.color.blanc);
                tv.setTextColor(Color.BLACK);
                tv.setTextSize(15);
                tv.setText("Détecteur 2");
                Typeface t = Typeface.create( "serif", Typeface.NORMAL);
                tv.setTypeface(t);
                tv.setPadding(50, 50,50,50);
                toast.setView(tv);
                toast.show();
            }
        });
        D3.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View c) {
                Toast toast = new Toast(getApplicationContext());
                toast.setGravity(Gravity.CENTER,0,-150);
                TextView tv = new TextView (MainActivity.this) ;
                tv.setBackgroundResource(R.color.blanc);
                tv.setTextColor(Color.BLACK);
                tv.setTextSize(15);
                tv.setText("Détecteur 3"
                );
                Typeface t = Typeface.create( "serif", Typeface.NORMAL);
                tv.setTypeface(t);
                tv.setPadding(50, 50,50,50);
                toast.setView(tv);
                toast.show();
            }
        });
        D4.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View d) {
                Toast toast = new Toast(getApplicationContext());
                toast.setGravity(Gravity.CENTER,0,-150);
                TextView tv = new TextView (MainActivity.this) ;
                tv.setBackgroundResource(R.color.blanc);
                tv.setTextColor(Color.BLACK);
                tv.setTextSize(15);
                tv.setText("Détecteur 4");
                Typeface t = Typeface.create( "serif", Typeface.NORMAL);
                tv.setTypeface(t);
                tv.setPadding(50, 50,50,50);
                toast.setView(tv);
                toast.show();
            }
        });


        btnWrite.setOnClickListener(new View.OnClickListener()
        {
            @Override
            public void onClick(View v) {
                try {
                    if(myTag ==null) {
                        Toast.makeText(context, ERROR_DETECTED, Toast.LENGTH_LONG).show();
                    } else {
                        write(message.getText().toString(), myTag);
                        Toast.makeText(context, WRITE_SUCCESS, Toast.LENGTH_LONG ).show();
                    }
                } catch (IOException e) {
                    Toast.makeText(context, WRITE_ERROR, Toast.LENGTH_LONG ).show();
                    e.printStackTrace();
                } catch (FormatException e) {
                    Toast.makeText(context, WRITE_ERROR, Toast.LENGTH_LONG ).show();
                    e.printStackTrace();
                }
            }
        });

        nfcAdapter = NfcAdapter.getDefaultAdapter(this);
        if (nfcAdapter == null) {
            // Stop here, we definitely need NFC
            Toast.makeText(this, "Cet appareil ne possède pas la technologie NFC", Toast.LENGTH_LONG).show();
            finish();
        }
        readFromIntent(getIntent());

        pendingIntent = PendingIntent.getActivity(this, 0, new Intent(this, getClass()).addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP), 0);
        IntentFilter tagDetected = new IntentFilter(NfcAdapter.ACTION_TAG_DISCOVERED);
        tagDetected.addCategory(Intent.CATEGORY_DEFAULT);
        writeTagFilters = new IntentFilter[] { tagDetected };
    }


    /******************************************************************************
     **********************************Read From NFC Tag***************************
     ******************************************************************************/
    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());
        }


        tvNFCContent.setText(text+"(( taille de la trame: " + text.length () +"))");
        //lenght.setText(text.length ());
        //tramemail.setText(text+"(( taille de la trame: " + text.length () +"))" + Version);
        nfc_annoce.setVisibility(View.GONE);
        back.setVisibility(View.GONE);



        //Nbre_defauts1.setText("  Le Nombre de défauts enregistrés sur le détecteur 1 est de "+ text.charAt(39)+ text.charAt(40));
        //Nbre_defauts2.setText("  Le Nombre de défauts enregistrés sur le détecteur 2 est de "+ text.charAt(41)+ text.charAt(42));
        //Nbre_defauts3.setText("  Le Nombre de défauts enregistrés sur le détecteur 3 est de "+ text.charAt(43)+ text.charAt(44));
        //Nbre_defauts4.setText("  Le Nombre de défauts enregistrés sur le détecteur 4 est de "+ text.charAt(45)+ text.charAt(46));
        //Nbre_defauts_pion.setText("  Le Nombre de défauts enregistrés sur l'autoprotection est de "+ text.charAt(57)+ text.charAt(58));
        //Nbre_defauts_capot.setText("  Le Nombre de défauts enregistrés sur le capot est de "+ text.charAt(55)+ text.charAt(56));

        CompteurTelecommandes.setVisibility(View.VISIBLE);
        Conseil_detecteur.setVisibility(View.VISIBLE);
        PP4.setVisibility(View.VISIBLE);
        text_centrale.setVisibility(View.VISIBLE);
        Titre_systeme.setVisibility(View.VISIBLE);
        Titre_telecommande.setVisibility(View.VISIBLE);

        if (text.charAt(6) == 'O')
        {
            Etat_centrale.setBackgroundResource(R.drawable.ic_ok);
        } else
        {
            AlertDialog alertDialog = new AlertDialog.Builder(MainActivity.this).create();
            alertDialog.setTitle("Centrale en Alarme");
            alertDialog.setMessage(" La centrale de sécurisation est en défaut.\n" +
                    "Une intervention de votre part est nécessaire !");
            alertDialog.setButton(AlertDialog.BUTTON_NEUTRAL, "Fermer",
                    new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int which) {
                            dialog.dismiss();
                        }
                    });
            alertDialog.show();
            Etat_centrale.setBackgroundResource(R.drawable.ic_warning_red);
        }




        if (text.charAt(7) == 'A') {
            D1.setBackgroundResource(R.drawable.ic_warning_red);
        } else if (text.charAt(7) == 'O') {
            D1.setBackgroundResource(R.drawable.ic_ok);
        } else if (text.charAt(7) == 'W') {
            D1.setBackgroundResource(R.drawable.ic__warning_orange);
        } else {
            D1.setBackgroundResource(R.drawable.ic_baseline_block_24);
        }
        if (text.charAt(8) == 'A') {
            D2.setBackgroundResource(R.drawable.ic_warning_red);
        } else if (text.charAt(8) == 'O') {
            D2.setBackgroundResource(R.drawable.ic_ok);
        } else if (text.charAt(8) == 'W') {
            D2.setBackgroundResource(R.drawable.ic__warning_orange);
        } else {
            D2.setBackgroundResource(R.drawable.ic_baseline_block_24);
        }

        if (text.charAt(9) == 'A') {
            D3.setBackgroundResource(R.drawable.ic_warning_red);
        } else if (text.charAt(9) == 'O') {
            D3.setBackgroundResource(R.drawable.ic_ok);
        } else if (text.charAt(9) == 'W') {
            D3.setBackgroundResource(R.drawable.ic__warning_orange);
        } else {
            D3.setBackgroundResource(R.drawable.ic_baseline_block_24);
        }

        if (text.charAt(10) == 'A') {
            D4.setBackgroundResource(R.drawable.ic_warning_red);
        } else if (text.charAt(10) == 'O') {
            D4.setBackgroundResource(R.drawable.ic_ok);
        } else if (text.charAt(10) == 'W') {
            D4.setBackgroundResource(R.drawable.ic__warning_orange);
        } else {
            D4.setBackgroundResource(R.drawable.ic_baseline_block_24);
        }



        if (text.charAt(59)== 'O'){
            Capot.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    Toast.makeText(getApplicationContext(), "Autoprotection capot enclenchée", Toast.LENGTH_SHORT).show();
                }
            });
            Capot.setBackgroundResource(R.drawable.capot_vert);
            Defauts_capot.setVisibility(View.GONE);
        }

        else {
            Capot.setBackgroundResource(R.drawable.capot_rouge);
            Capot.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    Toast toast = new Toast(getApplicationContext());
                    toast.setGravity(Gravity.CENTER,0,-150);
                    TextView tv = new TextView (MainActivity.this) ;
                    tv.setBackgroundResource(R.color.blanc);
                    tv.setTextColor(Color.BLACK);
                    tv.setTextSize(15);
                    tv.setText("Défaut autoprotection capot \n" +
                            "Vérifiez que le capot est bien fermé et vissé");
                    Typeface t = Typeface.create( "serif", Typeface.NORMAL);
                    tv.setTypeface(t);
                    tv.setPadding(50, 50,50,50);
                    toast.setView(tv);
                    toast.show();

                }
            });


            Defauts_capot.setText("Défaut autoprotection capot \n"+
                    "Vérifiez que le capot est bien fermé et vissé");
        }



        if (text.charAt(60) == 'O') {
            Autoprotection.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View e) {
                    Toast toast = new Toast(getApplicationContext());
                    toast.setGravity(Gravity.CENTER,0,-150);
                    TextView tv = new TextView (MainActivity.this) ;
                    tv.setBackgroundResource(R.color.blanc);
                    tv.setTextColor(Color.BLACK);
                    tv.setTextSize(15);
                    tv.setText("Autoprotection base enclenchée");
                    Typeface t = Typeface.create( "serif", Typeface.NORMAL);
                    tv.setTypeface(t);
                    tv.setPadding(50, 50,50,50);
                    toast.setView(tv);
                    toast.show();

                }
            });
            Autoprotection.setBackgroundResource(R.drawable.pion_vert);
            Defauts_pion.setVisibility(View.GONE); }

        else  {
            Autoprotection.setBackgroundResource(R.drawable.pion_rouge);
            Autoprotection.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View e) {
                    Toast toast = new Toast(getApplicationContext());
                    toast.setGravity(Gravity.CENTER,0,-150);
                    TextView tv = new TextView (MainActivity.this) ;
                    tv.setBackgroundResource(R.color.blanc);
                    tv.setTextColor(Color.BLACK);
                    tv.setTextSize(15);
                    tv.setText("Défaut autoprotection base \n" +
                            "Vérifiez le contact et la fixation de la centrale du mobilier.\n" +
                            "Selon l'installation, revissez ou re-adhésivez la centrale");
                    Typeface t = Typeface.create( "serif", Typeface.NORMAL);
                    tv.setTypeface(t);
                    tv.setPadding(50, 50,50,50);
                    toast.setView(tv);
                    toast.show();

                }
            });
            Defauts_pion.setVisibility(View.VISIBLE);

            Defauts_pion.setText("Défaut autoprotection base\n " +
                    "Vérifiez le contact et la fixation de la centrale au mobilier \n" +
                    "Selon l'installation, revissez ou re-adhésivez la centrale");
        }


        if (text.charAt(61) == 'P') {
            Alimentation.setBackgroundResource(R.drawable.ic_baseline_power_vert);
            Alimentation.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    Toast toast = new Toast(getApplicationContext());
                    toast.setGravity(Gravity.CENTER,0,-150);
                    TextView tv = new TextView (MainActivity.this) ;
                    tv.setBackgroundResource(R.color.blanc);
                    tv.setTextColor(Color.BLACK);
                    tv.setTextSize(15);
                    tv.setText("Alimentation secteur");
                    Typeface t = Typeface.create( "serif", Typeface.NORMAL);
                    tv.setTypeface(t);
                    tv.setPadding(50, 50,50,50);
                    toast.setView(tv);
                    toast.show();

                }
            });

        }
        else if (text.charAt(61)== 'B') {
            Alimentation.setBackgroundResource(R.drawable.ic_baseline_power_bleu);
            Alimentation.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    Toast toast = new Toast(getApplicationContext());
                    toast.setGravity(Gravity.CENTER,0,-150);
                    TextView tv = new TextView (MainActivity.this) ;
                    tv.setBackgroundResource(R.color.blanc);
                    tv.setTextColor(Color.BLACK);
                    tv.setTextSize(15);
                    tv.setText("Alimentation double secteur");
                    Typeface t = Typeface.create( "serif", Typeface.NORMAL);
                    tv.setTypeface(t);
                    tv.setPadding(50, 50,50,50);
                    toast.setView(tv);
                    toast.show();
                }
            });
        }
        else {
            Alimentation.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    Toast toast = new Toast(getApplicationContext());
                    toast.setGravity(Gravity.CENTER,0,-150);
                    TextView tv = new TextView (MainActivity.this) ;
                    tv.setBackgroundResource(R.color.blanc);
                    tv.setTextColor(Color.BLACK);
                    tv.setTextSize(15);
                    tv.setText("Alimentation pile");
                    Typeface t = Typeface.create( "serif", Typeface.NORMAL);
                    tv.setTypeface(t);
                    tv.setPadding(50, 50,50,50);
                    toast.setView(tv);
                    toast.show();

                }
            });
            Alimentation.setBackgroundResource(R.drawable.ic_baseline_power_rouge);

        }
        if (text.charAt(62) == 'H') {
            Batterie.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    Toast toast = new Toast(getApplicationContext());
                    toast.setGravity(Gravity.CENTER,0,-150);
                    TextView tv = new TextView (MainActivity.this) ;
                    tv.setBackgroundResource(R.color.blanc);
                    tv.setTextColor(Color.BLACK);
                    tv.setTextSize(15);
                    tv.setText("Capacité de la pile (CR 123 A) optimale");
                    Typeface t = Typeface.create( "serif", Typeface.NORMAL);
                    tv.setTypeface(t);
                    tv.setPadding(50, 50,50,50);
                    toast.setView(tv);
                    toast.show();
                }
            });
            Batterie.setBackgroundResource(R.drawable.batterie_full); }
        else if (text.charAt(62)== 'M'){
            Batterie.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    Toast toast = new Toast(getApplicationContext());
                    toast.setGravity(Gravity.CENTER,0,-150);
                    TextView tv = new TextView (MainActivity.this) ;
                    tv.setBackgroundResource(R.color.blanc);
                    tv.setTextColor(Color.BLACK);
                    tv.setTextSize(15);
                    tv.setText("Pile (CR 123 A) à 50% de sa capacité");
                    Typeface t = Typeface.create( "serif", Typeface.NORMAL);
                    tv.setTypeface(t);
                    tv.setPadding(50, 50,50,50);
                    toast.setView(tv);
                    toast.show();
                }
            });
            Batterie.setBackgroundResource(R.drawable.batterie_midlle);
        }
        else if (text.charAt(62)== 'L'){
            Batterie.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    Toast toast = new Toast(getApplicationContext());
                    toast.setGravity(Gravity.CENTER,0,-150);
                    TextView tv = new TextView (MainActivity.this) ;
                    tv.setBackgroundResource(R.color.blanc);
                    tv.setTextColor(Color.BLACK);
                    tv.setTextSize(15);
                    tv.setText("Capacité de la pile (CR 123 A) faible \n" +
                            "\n"+
                            "Vite, remplacez-la ! "
                    );
                    Typeface t = Typeface.create( "serif", Typeface.NORMAL);
                    tv.setTypeface(t);
                    tv.setPadding(50, 50,50,50);
                    toast.setView(tv);
                    toast.show();
                }
            });
            Batterie.setBackgroundResource(R.drawable.batterie_vide);
        }
        else {
            Batterie.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    Toast toast = new Toast(getApplicationContext());
                    toast.setGravity(Gravity.CENTER,0,-150);
                    TextView tv = new TextView (MainActivity.this) ;
                    tv.setBackgroundResource(R.color.blanc);
                    tv.setTextColor(Color.BLACK);
                    tv.setTextSize(15);
                    tv.setText("Aucune pile insérée." +
                            "Pour une installation 100% sécurisée, nous vous conseillons d'insérer une pile CR 123 A"
                    );
                    Typeface t = Typeface.create( "serif", Typeface.NORMAL);
                    tv.setTypeface(t);
                    tv.setPadding(50, 50,50,50);
                    toast.setView(tv);
                    toast.show();

                }
            });
            Batterie.setBackgroundResource(R.drawable.batterie_absente);
        }


        //int version = (int)text.charAt(4);
        if (text.charAt(67)=='I'|| text.charAt(72)=='I') {
            Telecommande_centrale.setVisibility(View.VISIBLE);
            Telecommande_centrale.setText("Attention:des télécommandes inconnues ont été présentées à la centrale" +
                    "Consultez la procédure d'affection des télécommandes");
        }
        else{
            Telecommande_centrale.setVisibility(View.GONE);
        }



    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu){
        getMenuInflater().inflate(R.menu.main,menu);
        return super.onCreateOptionsMenu(menu);
    }
    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()){
            case R.id.action_share:
                Intent sharingIntent =new Intent(Intent.ACTION_SEND);
                sharingIntent.setType("text/plain");
                String shareBody= "Bonjour";
                String shareSubject= "Retour SAV";

                sharingIntent.putExtra(Intent.EXTRA_TEXT,shareBody);
                sharingIntent.putExtra(Intent.EXTRA_SUBJECT,shareSubject);
                startActivity(Intent.createChooser(sharingIntent, "partager avec"));
                break;
        }
        return super.onOptionsItemSelected(item);
    }

    /******************************************************************************
     **********************************Write to NFC Tag****************************
     ******************************************************************************/
    private void write(String text, Tag tag) throws IOException, FormatException {
        NdefRecord[] records = { createRecord(text) };
        NdefMessage message = new NdefMessage(records);
        // Get an instance of Ndef for the tag.
        Ndef ndef = Ndef.get(tag);
        // Enable I/O
        ndef.connect();
        // Write the message
        ndef.writeNdefMessage(message);
        // Close the connection
        ndef.close();
    }
    private NdefRecord createRecord(String text) throws UnsupportedEncodingException {
        String lang       = "en";
        byte[] textBytes  = text.getBytes();
        byte[] langBytes  = lang.getBytes("US-ASCII");
        int    langLength = langBytes.length;
        int    textLength = textBytes.length;
        byte[] payload    = new byte[1 + langLength + textLength];

        // set status byte (see NDEF spec for actual bits)
        payload[0] = (byte) langLength;

        // copy langbytes and textbytes into payload
        System.arraycopy(langBytes, 0, payload, 1,              langLength);
        System.arraycopy(textBytes, 0, payload, 1 + langLength, textLength);

        NdefRecord recordNFC = new NdefRecord(NdefRecord.TNF_WELL_KNOWN,  NdefRecord.RTD_TEXT,  new byte[0], payload);

        return recordNFC;
    }



    @Override
    protected void onNewIntent(Intent 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();
    }



    /******************************************************************************
     **********************************Enable Write********************************
     ******************************************************************************/
    private void WriteModeOn(){
        writeMode = true;
        nfcAdapter.enableForegroundDispatch(this, pendingIntent, writeTagFilters, null);
    }
    /******************************************************************************
     **********************************Disable Write*******************************
     ******************************************************************************/
    private void WriteModeOff(){
        writeMode = false;
        nfcAdapter.disableForegroundDispatch(this);
    }


}

Answer 1

您可以擁有一個包含值的 Map，因此您可以直接訪問它們。 例如：

final Map<Char, Integer> foo = new HashMap();
foo.add('A', R.drawable.ic_warning_red);
foo.add('O', R.drawable.ic_ok);
//... so on

然后你可以直接應用它

D3.setBackgroundResource(
Optional.ofNullable(foo.get(text.charAt(9)))
   .orElse(R.drawable.ic_baseline_block_24));

Answer 2

減少我的代碼的長度，這樣我就可以很容易地改變它，因為每次改變它都很難

正如@Steve 所提議的，您可以重構代碼以使其更小且更易於修改/編輯。 一種可能的方法是說，創建一個方法 updateTextview()。 就像是

private void updateTextview(final String text){
  Toast toast = new Toast(getApplicationContext());
  toast.setGravity(Gravity.CENTER,0,-150);
  TextView tv = new TextView (MainActivity.this) ;
  tv.setBackgroundResource(R.color.blanc);
  tv.setTextColor(Color.BLACK);
  tv.setTextSize(15);
  tv.setText(text);
  Typeface t = Typeface.create( "serif", Typeface.NORMAL);
  tv.setTypeface(t);
  tv.setPadding(50, 50,50,50);
  toast.setView(tv);
  toast.show();
}

PS：我注意到只有tv.setText()發生了變化。 您可以根據函數的變化向函數添加更多參數。

要使用該方法，在 D1 上添加偵聽器 say 時，您可以使用類似

D1.setOnClickListener(new View.OnClickListener() {
  @Override
  public void onClick(View a) {
    final String text = "Détecteur 1";
    updateTextview(text);
  }
});

此外，使用switch 語句（而不是 ifs）可以使您的代碼看起來更簡潔。 作為一個例子，我將從代碼中取出一小段 if-else-ifs。 text.charAt(7) 上的 ifs 改變了 D1 的 BackgroundResource。

char charAt7 = text.charAt(7);
switch(charAt7){
  case 'A' : D1.setBackgroundResource(R.drawable.ic_warning_red); break;
  case 'O' : D1.setBackgroundResource(R.drawable.ic_ok); break;
  case 'W' : D1.setBackgroundResource(R.drawable.ic__warning_orange); break;
  default: D1.setBackgroundResource(R.drawable.ic_baseline_block_24);
}