Android « ne peut pas résoudre le symbole » pour setOnCheckedChangeListener et buttonView

Question

Je suis en train de créer un commutateur qui, lorsqu'il est activé cache un bouton appelé button mais il renvoie une erreur pour SetOnCheckedChangeListener et buttonView qui dit Cannot resolve symbol

package com.jordthedev.firstapplication; 

import android.content.Intent; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.CompoundButton; 
import android.widget.ToggleButton; 

public class MainActivity extends AppCompatActivity { 
    int count = 0; 


    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 

    } 


    public void switchActivity(View v){ 
     startActivity(new Intent(MainActivity.this, SecondActivity.class)); 
    } 

    ToggleButton toggle = (ToggleButton) findViewById(R.id.toggleButton); 
    toggle.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() { 
     public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { 
      if (isChecked) { 
       toggle.setVisibility(toggle.INVISIBLE); 
      } else { 
       toggle.setVisibility(toggle.VISIBLE); 
      } 
     } 
    }); 

} 

Answer 1

Peut-être vous doivent placer ToggleButton dans la méthode onCreate() essayez le code ci-dessus

package com.jordthedev.firstapplication; 

import android.content.Intent; 
import android.support.v7.app.AppCompatActivity; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.CompoundButton; 
import android.widget.ToggleButton; 

public class MainActivity extends AppCompatActivity { 
    int count = 0; 


    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.activity_main); 

     final ToggleButton toggle = (ToggleButton) findViewById(R.id.toggleButton); 
     toggle.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() { 

      public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { 
       if (isChecked) { 
        toggle.setVisibility(toggle.INVISIBLE); 
       } else { 
        toggle.setVisibility(toggle.VISIBLE); 
       } 
      } 
     }); 
    } 


    public void switchActivity(View v){ 
     startActivity(new Intent(MainActivity.this, SecondActivity.class)); 
    } 



} 

Answer 2

Replace your OnCheckedChangeListener Code with this

ToggleButton toggle =(ToggleButton) findViewById(R.id.toggleButton); 
     toggle.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() { 
      @Override 
      public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { 
       if (isChecked) { 
        toggle.setVisibility(toggle.INVISIBLE); 
       } else { 
        toggle.setVisibility(toggle.VISIBLE); 
       } 
      } 
     });