Android "Cannot resolve symbol" 用于 setOnCheckedChangeListener 和 buttonView

Question

我正在尝试创建一个开关，当它启用时会隐藏一个名为 button 的按钮，但它 returns SetOnCheckedChangeListener 和 buttonView 的错误 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

也许你必须将 ToggleButton 放在 onCreate() 方法中试试下面的代码

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);
                }
            }
        });

Android "Cannot resolve symbol" 用于 setOnCheckedChangeListener 和 buttonView

Android "Cannot resolve symbol" for setOnCheckedChangeListener and buttonView

java

android

togglebutton