单选按钮组的setOnCheckedChangeListener方法

Question

单选按钮组的setOnCheckedChangeListener方法

14

我对单选按钮组有些问题，我是Android开发的新手，所以不太清楚如何处理它。这是一个表格，其中包含一些输入字段和用于选择性别的单选按钮组和保存按钮。但我不知道应该在哪里放置radiogroup setoncheakchangelistener？因此它会给我错误。

主活动：

package com.dietandroidproject;

import Databasedata.Person;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RadioButton;
import android.widget.RadioGroup;
import android.widget.Spinner;
import android.widget.TextView;
import android.widget.Toast;


public class MainActivity extends Activity {

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    final RadioGroup genderselected = (RadioGroup) findViewById(R.id.selectgender);

    genderselected.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener()            {

        @Override
        public void onCheckedChanged(RadioGroup arg0, int selectedId) {
            selectedId=genderselected.getCheckedRadioButtonId();
            RadioButton genderchoosed = (RadioButton) findViewById(selectedId);
            String gender = genderchoosed.getText().toString();

        }
     });

    Button saveinformation = (Button) findViewById(R.id.saveinformation);
    saveinformation.setOnClickListener(new View.OnClickListener() {

        EditText weighttext = (EditText) findViewById(R.id.weighttext);
        EditText heighttext = (EditText) findViewById(R.id.heighttext);
        EditText usernametext = (EditText) findViewById(R.id.usernametext);
        EditText agetext = (EditText) findViewById(R.id.agetext);
        Spinner activitytext = (Spinner) findViewById(R.id.chooseactivity);
        Button saveinformation = (Button) findViewById(R.id.saveinformation);
        String pa = activitytext.getSelectedItem().toString();
         @Override
        public void onClick(View v) {

            int weight = (int) Float.parseFloat(weighttext.getText()
                    .toString());
            int height = (int) Float.parseFloat(heighttext.getText()
                    .toString());
            String username = usernametext.getText().toString();
            int age = (int) Float.parseFloat(agetext.getText().toString());
            TextView genderchoosed = (TextView) findViewById(genderselected
                    .getCheckedRadioButtonId());
            String gender = genderchoosed.getText().toString();
            String pa = activitytext.getSelectedItem().toString();

       //BMI==========================================================
            int Bmivalue = calculateBMI(weight, height);
            String bmiInterpretation = interpretBMI(Bmivalue);
            float idealweight = idealweight(weight, height, gender, pa, age);
            double dailycalories=dailycalories(weight,height,gender,pa,age);

         //insert data in to db===================================================
           Person person = new Person();
            person.setUsername(username);
            person.setHeight(height);
            person.setWeight(weight);
            person.setAge(age);
            person.setGender(gender);
            person.setPa(pa);
            person.setBmivalue(Bmivalue);
            person.setBmiInterpretation(bmiInterpretation);
            person.setIdealweight(idealweight);
            person.setDailycalories(dailycalories);
            Databasedata.DatabaseAdapter dbAdapter = new Databasedata.DatabaseAdapter(
                    MainActivity.this);
            dbAdapter.insertPerson(person);

            Toast.makeText(getApplicationContext(),
                    Bmivalue + "and you are" + bmiInterpretation,
                    Toast.LENGTH_LONG).show();

           }
         });
        }
        //BMI FUNCTION===============================================
        private int calculateBMI(int weight, int height) {

           return (int) (weight / (height * height));
        };

        private String interpretBMI(int Bmivalue) {

         if (Bmivalue < 18.5) {
          return "Underweight";
         } else if (Bmivalue < 25) {
           return "Normal";
         } else if (Bmivalue < 30) {
           return "Overweight";
         } else {
           return "Obese";
         }
        }
         //IDEAL WEIGHT========================================

private float idealweight(int weight, int height, String gender, String pa,
        int age) {
    float x = (float) 0.0;
    int bmi;

    bmi = idealbmi(age);
    x = bmi * (height * height);
    return x;

  }

   public int idealbmi(int age) {
    int bmi = 0;
    if (age > 17 && age <= 19) {
        bmi = 21;
    }
    if (age > 19 && age <= 24) {
        bmi = 22;
    }
    if (age > 24 && age <= 34) {
        bmi = 23;
    }
    if (age > 34 && age <= 44) {
        bmi = 24;
    }
    if (age > 44 && age <= 54) {
        bmi = 25;
    }
    if (age > 54 && age <= 64) {
        bmi = 26;
    }
    if (age > 64) {
        bmi = 27;
    }

    return bmi;
    }
    //DAILY CALORIES===============================================
    public double suitablepa(String pa) {
    double suitablepa = 0;
    if (pa.equals("Highly active")) {
        suitablepa =  1.48;
    }
    if (pa.equals("Active")) {
        suitablepa =  1.25;
    }
    if (pa.equals("Low activity")) {
        suitablepa =  1.11;
    }
    if (pa.equals("Sedentary")) {
        suitablepa =  1;
    }
    return suitablepa;

  }

  private double dailycalories(int weight, int height, String gender,
        String pa, int age) {
    double dailycalori = 0;
    double i;
    double j;
    double h;
    double k;
    if(gender.equals("femaleselected")){

        i=9.36*weight;
        j=726*height;
        h=suitablepa(pa)*(i+j);
        k=6.91*age;
        dailycalori=354-k+h;

    }else if(gender.equals("maleselected")){

        i=15.91*weight;
        j=539.6*height;
        h=suitablepa(pa)*(i+j);
        k=9.53*age;
        dailycalori=662-k+h;
    }


    return dailycalori;
}
}

XML 代码

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/backgroundmain"
android:orientation="vertical" >

<RelativeLayout
    android:id="@+id/personinformation"
    android:layout_width="match_parent"
    android:layout_height="0dp"
    android:layout_weight="1.98" >

    <EditText
        android:id="@+id/heighttext"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/usernametext"
        android:layout_below="@+id/usernametext"
        android:ems="10"
        android:hint="Enter Your Height" >
    </EditText>

    <EditText
        android:id="@+id/usernametext"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="20dp"
        android:ems="10"
        android:hint="Enter Username" />

    <EditText
        android:id="@+id/weighttext"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/heighttext"
        android:layout_below="@+id/heighttext"
        android:ems="10"
        android:hint="Enter Your Weight" />

    <EditText
        android:id="@+id/agetext"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignLeft="@+id/weighttext"
        android:layout_below="@+id/weighttext"
        android:ems="10"
        android:hint="Enter Your Age" >

        <requestFocus />
    </EditText>

</RelativeLayout>

<View
    android:layout_width="250dp"
    android:layout_height="1dip"
    android:layout_gravity="center"
    android:layout_marginTop="20dp"
    android:background="#aaa" />

<RelativeLayout
    android:id="@+id/choosegender"
    android:layout_width="match_parent"
    android:layout_height="0dp"
    android:layout_weight="0.78" >

    <TextView
        android:id="@+id/choosefemaleormale"
        android:layout_width="match_parent"
        android:layout_height="30dip"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginTop="10dip"
        android:gravity="center"
        android:text="Gender : "
        android:textAlignment="center"
        android:textColor="#555"
        android:textSize="19sp" />

    <RadioGroup
        android:id="@+id/selectgender"
        android:layout_width="220dip"
        android:layout_height="wrap_content"
        android:layout_below="@+id/choosefemaleormale"
        android:layout_centerHorizontal="true"
        android:orientation="horizontal" >

        <RadioButton
            android:id="@+id/femaleselected"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_gravity="left"
            android:layout_weight="1"
            android:checked="true"
            android:text="female"
            android:onClick="onRadioButtonClicked"
             />

        <RadioButton
            android:id="@+id/maleselected"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_gravity="right"
            android:layout_weight="1"
            android:text="male"
            android:onClick="onRadioButtonClicked" />
    </RadioGroup>
</RelativeLayout>
    <View
    android:layout_width="250dp"
    android:layout_height="1dip"
    android:layout_gravity="center"
    android:layout_marginTop="20dp"
    android:background="#aaa" />
<RelativeLayout
    android:id="@+id/choosepa"
    android:layout_width="250dip"
    android:layout_height="0dp"
    android:layout_weight="1"
    android:layout_gravity="center" >

    <Spinner
        android:id="@+id/chooseactivity"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:entries="@array/activityitems"
        android:gravity="center"
        android:prompt="@string/level_of_activity" />

</RelativeLayout>

<Button
    android:layout_width="90dp"
    android:layout_height="0dp"
    android:layout_gravity="right"
    android:layout_marginBottom="10dip"
    android:layout_marginRight="20dp"
    android:layout_weight="0.46"
    android:background="@drawable/recent_foods_depressed"
    android:hint="save"
    android:text="save"
    android:textColor="#fff"
    android:textSize="20sp"
    android:textStyle="bold" 
    android:onClick="saveinformation"
    android:id="@+id/saveinformation"/>

 </LinearLayout>

- mkafiyan

1

你得到了什么错误？ - Srijith

@Sree14 致命异常：main `08-03 06:22:57.169: E/AndroidRuntime(1188): java.lang.IllegalStateException: 在活动类 com.dietandroidproject.MainActivity 中找不到方法 onRadioButtonClicked(View) 以处理视图类 android.widget.RadioButton 的 onClick 处理程序，其 ID 为 'maleselected'。 - mkafiyan

@Sree14 感谢你的帮助 ;) - mkafiyan

@Sree14 对于你之前提到的我需要在onCreate之前声明性别的问题，我很抱歉。我遇到了这个问题，因为我必须从 genderchoosed.getText().toString(); 中获取性别的值，然后在我的函数中使用它。有没有什么方法可以解决这个问题呢？ - mkafiyan

@Sree14，您的意思是我必须在onCheckedChanged中调用所有使用gender的方法吗？如果按照您所说的做，当单击“保存”按钮时，因为onclick无法访问nCheckedChanged中的变量，所以无法将它们插入到数据库中，对吗？！ - mkafiyan

显示剩余8条评论

6个回答

11

RadioGroup yourRadioGroup = (RadioGroup) findViewById(R.id.radioGroup1);
        yourRadioGroup.setOnCheckedChangeListener(new OnCheckedChangeListener()
        {
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId)
            {
                switch(checkedId)
                {
                case R.id.radio0:
                    // TODO Something
                    break;
                case R.id.radio1:
                    // TODO Something
                    break;
                case R.id.radio2:
                    // TODO Something
                    break;
                }
            }
        });

或者，如果你更喜欢：

yourRadioGroupName.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener()
        {
            @Override
            public void onCheckedChanged(RadioGroup group, int checkedId)
            {
                int idRadioButtonChosen = yourRadioGroupName.getCheckedRadioButtonId();

                if(idRadioButtonChosen > 0){

                    radioButtonChosen = (RadioButton) findViewById(idRadioButtonChosen);
                    textViewOnclick.setText(radioButtonChosen.getText());

                }


            }
        });

- Thiago Araújo

6

问题在于你的单选按钮试图引用主活动中的onRadioButtonClicked方法。但是你没有指定该方法。记住，如果你使用android:onClick，你不应该在主活动中使用setOnCheckedChangeListener，反之亦然。

- Srijith

5

在Kotlin中，您可以使用以下方式...

  radioGroup.setOnCheckedChangeListener(RadioGroup.OnCheckedChangeListener { group, checkedId ->

          val radio:RadioButton = group.findViewById(checkedId)
          Log.e("selectedtext-->",radio.text.toString())

  })

或者

radioGroup.setOnCheckedChangeListener(RadioGroup.OnCheckedChangeListener { group, checkedId ->

         var selectedId = rg.checkedRadioButtonId
         val radio:RadioButton = group.findViewById(selectedId)
            Log.e("selectedtext-->",radio.text.toString())

   })

- Enamul Haque

1

你可以在 Kotlin 中使用此示例：

radioGroup.setOnCheckedChangeListener { _, checkedId ->
        when (checkedId) {
            R.id.radioButton1 -> {

            }
            R.id.radioButton2 -> {

            }
        }
    }

- bebosh

-1

这段代码对于单选按钮与单选组无法正常工作

 radioButton.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
      @Override
      public void onCheckedChanged(CompoundButton compoundButton, boolean b) {
                    
      }
    });

- sarjeet singh

你的回答可以通过添加更多关于代码的信息以及它如何帮助提问者来改进。 - Tyler2P

网页内容由stack overflow 提供, 点击上面的

可以查看英文原文，
原文链接

- Ali · Accepted Answer

 radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener()
    {
        public void onCheckedChanged(RadioGroup group, int checkedId) {
            // checkedId is the RadioButton selected
            RadioButton rb=(RadioButton)findViewById(checkedId);
            Toast.makeText(getApplicationContext(), rb.getText(), Toast.LENGTH_SHORT).show();
        }
    });