Je veux écrire cette méthode une seule fois et l'appeler plusieurs fois pour l'attribution de la valeur pour divers TextView

Question

public class SignUpSecondActivity extends AppCompatActivity { 
private LayoutInflater layoutInflater; 
private EditText txtFrom, txtTo; 
private Calendar calendar; 
private TimePickerDialog timepickerdialog; 
private int CalendarHour, CalendarMinute; 
private String format; 
private TextView txtClubTime; 


@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_sign_up_second); 
    Toolbar toolbar = findViewById(R.id.toolbar); 

    getTxtFromSunday().setOnClickListener(view -> getClubTiming(txtClubTime)); 
} 

private void getClubTiming(TextView txtClubTime) { 

    TextView txtClub = txtClubTime; 
    calendar = Calendar.getInstance(); 
    CalendarHour = calendar.get(Calendar.HOUR_OF_DAY); 
    CalendarMinute = calendar.get(Calendar.MINUTE); 
    timepickerdialog = new TimePickerDialog(this, 
      (view, hourOfDay, minute) -> { 
       if (hourOfDay == 0) { 
        hourOfDay += 12; 
        format = "am"; 
       } else if (hourOfDay == 12) { 
        format = "pm"; 
       } else if (hourOfDay > 12) { 
        hourOfDay -= 12; 
        format = "pm"; 
       } else { 
        format = "am"; 
       } 
       Log.i("@sandy","ClubTiming: "+txtClub); 
       if (txtClub!=null){ 
        txtClub.setText(String.format("%02d:%02d" + format, hourOfDay, minute)); 
        Log.i("@sandy","ClubTiming- "+txtClub); 

       } 

       Log.i("@sandy", "Time: " + String.format("%02d:%02d" + format, hourOfDay, minute)); 
      }, CalendarHour, CalendarMinute, false); 
    timepickerdialog.show(); 
} 




private TextView getTxtFromSunday() { 
    return (TextView) findViewById(R.id.txtFromSunday); 
} 

private TextView getTxtToSunday() { 
    return (TextView) findViewById(R.id.txtToSunday); 
} 

private TextView getTxtFromMonday() { 
    return (TextView) findViewById(R.id.txtFromMonday); 
} 

private TextView getTxtToMonday() { 
    return (TextView) findViewById(R.id.txtToMonday); 
} 


} 

Comme je viens à appeler cette méthode OnClickListener toujours pour attribuer la valeur TimePicker, mais me donner exception de pointeur nul l'exception est txtClub.setText(String.format("%02d:%02d" + format, hourOfDay, minute)); J'ai le problème dans la définition de la valeur pour TextView. S'il vous plaît Aidez-moi là .. Merci.Ceci est mon activité entière comme donnée ci-dessus ... comme suggéré

Answer 1

Initialisation toutes les données dans la méthode initView

Essayez ceci dans votre code.

public class SignUpSecondActivity extends AppCompatActivity { 
private LayoutInflater layoutInflater; 
private EditText txtFrom, txtTo; 
private Calendar calendar; 
private TimePickerDialog timepickerdialog; 
private int CalendarHour, CalendarMinute; 
private String format; 
private TextView txtClubTime,txtFromSunday,txtToSunday,txtFromMonday,txtToMonday; 


@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_sign_up_second); 
    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
    initView(); 
    getTxtFromSunday().setOnClickListener(view -> getClubTiming(txtClubTime)); 
} 

private void initView() { 
    txtClubTime = (TextView) findViewById(R.id.txtClubTime); 
    txtFromSunday = (TextView) findViewById(R.id.txtFromSunday); 
    txtToSunday = (TextView) findViewById(R.id.txtToSunday); 
    txtFromMonday = (TextView) findViewById(R.id.txtFromMonday); 
    txtToMonday = (TextView) findViewById(R.id.txtToMonday); 
} 

private void getClubTiming(TextView txtClubTime) { 

    TextView txtClub = txtClubTime; 
    calendar = Calendar.getInstance(); 
    CalendarHour = calendar.get(Calendar.HOUR_OF_DAY); 
    CalendarMinute = calendar.get(Calendar.MINUTE); 
    timepickerdialog = new TimePickerDialog(this, 
      (view, hourOfDay, minute) -> { 
       if (hourOfDay == 0) { 
        hourOfDay += 12; 
        format = "am"; 
       } else if (hourOfDay == 12) { 
        format = "pm"; 
       } else if (hourOfDay > 12) { 
        hourOfDay -= 12; 
        format = "pm"; 
       } else { 
        format = "am"; 
       } 
       Log.i("@sandy","ClubTiming: "+txtClub); 
       if (txtClub!=null){ 
        txtClub.setText(String.format("%02d:%02d" + format, hourOfDay, minute)); 
        Log.i("@sandy","ClubTiming- "+txtClub); 
       } 

       Log.i("@sandy", "Time: " + String.format("%02d:%02d" + format, hourOfDay, minute)); 
      }, CalendarHour, CalendarMinute, false); 
    timepickerdialog.show(); 
} 

} 

Answer 2

Obtenez les ID des textviews dans le oncreate de votre application, il ne fera pas de mal, Vous pouvez également attribuer le onclick auditeurs de 2 façons,

1. implémentent auditeur onclick
2. utilisation onclick dans xml

maintenant, créez votre méthode et l'appeler à AnyPoint vous voulez.

De l'activité:

yourMethod(); 

De Fragment:

((MainActivity)getActivity).yourMethod(); 

Answer 3

Vous obtenez une erreur parce que vous n'avez pas affecté quoi que ce soit à votre txtClubTime, Changer votre code comme ceci et dites-moi ce que cela est utile ou non

@Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_sign_up_second); 
     Toolbar toolbar = findViewById(R.id.toolbar); 
//Make a textView in xml and bind it . 
TextView txtClubTime=(TextView) findViewById(R.id.txtClubTime); 

     getTxtFromSunday().setOnClickListener(view -> getClubTiming(txtClubTime)); 
    } 

    private void getClubTiming(TextView txtClubTime) { 

     calendar = Calendar.getInstance(); 
     CalendarHour = calendar.get(Calendar.HOUR_OF_DAY); 
     CalendarMinute = calendar.get(Calendar.MINUTE); 
     timepickerdialog = new TimePickerDialog(this, 
       (view, hourOfDay, minute) -> { 
        if (hourOfDay == 0) { 
         hourOfDay += 12; 
         format = "am"; 
        } else if (hourOfDay == 12) { 
         format = "pm"; 
        } else if (hourOfDay > 12) { 
         hourOfDay -= 12; 
         format = "pm"; 
        } else { 
         format = "am"; 
        } 
        Log.i("@sandy","ClubTiming: "+txtClubTime); 
        if (txtClub!=null){ 
         txtClubTime.setText(String.format("%02d:%02d" + format, hourOfDay, minute)); 
         Log.i("@sandy","ClubTiming- "+txtClub); 

        } 

        Log.i("@sandy", "Time: " + String.format("%02d:%02d" + format, hourOfDay, minute)); 
       }, CalendarHour, CalendarMinute, false); 
     timepickerdialog.show(); 
    } 




    private TextView getTxtFromSunday() { 
     return (TextView) findViewById(R.id.txtFromSunday); 
    } 

    private TextView getTxtToSunday() { 
     return (TextView) findViewById(R.id.txtToSunday); 
    } 

    private TextView getTxtFromMonday() { 
     return (TextView) findViewById(R.id.txtFromMonday); 
    } 

    private TextView getTxtToMonday() { 
     return (TextView) findViewById(R.id.txtToMonday); 
    } 


    } 

Ajoutez simplement ceci comme insid e méthode:

this.txtClubTime=new TextView(this);