Android“无法解析符号"用于 setOnCheckedChangeListener 和 buttonView [英] Android "Cannot resolve symbol" for setOnCheckedChangeListener and buttonView

问题描述

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，但它会为 SetOnCheckedChangeListener 和 buttonView 返回一个错误，显示 Cannot resolve symbol

I'm trying to create a switch which when enabled hides a button called button but it returns an error for SetOnCheckedChangeListener and buttonView which says 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);
            }
        }
    });

}

推荐答案

也许你必须在 onCreate() 方法中放置 ToggleButton 试试下面的代码

Maybe you have to place ToggleButton in onCreate() method try below code

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));
    }



}

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