（解决）无效的类型无效的variabl [英] (SOLVED)void is an invalid type for the variabl

问题描述

我收到此错误 无效是一个无效的类型变量onRadioButtonClicked 但开发商的网站说，虚空是必须的！那么问题出在哪里？该XML的的编码是正确的。该概率介于这里...

 包com.example.kernel.version;

进口android.app.Activity;
进口android.content.Intent;
进口android.os.Bundle;
进口android.support.v4.app.NavUtils;
进口android.view.Menu;
进口android.view.MenuItem;
进口android.view.View;
进口android.widget.Button;
进口android.widget.RadioButton;

公共MainPage的类扩展了活动{

    @覆盖
    公共无效的onCreate（包savedInstanceState）{
        super.onCreate（savedInstanceState）;
        意向意图= getIntent（）;
        的setContentView（R.layout.activity_main_page）;

        公共无效onRadioButtonClicked（查看视图）{
            //是按钮现在检查？
            布尔查=（（单选）查看）.isChecked（）;

            //检查哪个单选按钮被点击
            开关（view.getId（））{
                案例R.id.radio_pirates：
                    如果（检查）
                        //海盗是最好的
                    打破;
                案例R.id.radio_ninjas：
                    如果（检查）
                        //忍者规则
                    打破;
            }

        }
 

解决方案

您 onRadioButtonClicked 包含在你的的onCreate 方法和mdash;让他们单独的方法。添加一个右括号} 之后：

 的setContentView（R.layout.activity_main_page）;
 

I am getting this error void is an invalid type for the variable onRadioButtonClicked but the developer site says that void is a must! So where is the problem?? The coding of the xml's is correct.. the prob lies somewhere here...

package com.example.kernel.version;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.NavUtils;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.Button;
import android.widget.RadioButton;

public class MainPage extends Activity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Intent intent=getIntent();
        setContentView(R.layout.activity_main_page);       

        public void onRadioButtonClicked(View view) {
            // Is the button now checked?
            boolean checked = ((RadioButton) view).isChecked();

            // Check which radio button was clicked
            switch(view.getId()) {
                case R.id.radio_pirates:
                    if (checked)
                        // Pirates are the best
                    break;
                case R.id.radio_ninjas:
                    if (checked)
                        // Ninjas rule
                    break;
            }

        }

解决方案

Your onRadioButtonClicked is contained within your onCreate method—make them separate methods. Add a closing brace } after:

setContentView(R.layout.activity_main_page); 

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