在从单选组中选择单选按钮时设置变量值

Posted 2023-03-27

【中文标题】在从单选组中选择单选按钮时设置变量值

【英文标题】：Set a variable value on select a radio button from radio group

【发布时间】：2018-03-08 17:38:25

【问题描述】：

当用户从无线电组中分别选择男性、女性或未分类时，我想将字符串变量值设置为 1,2,3。

现在我正在这样做，但即使我选择了一个单选按钮，它也会将变量值设置为null

代码：

RadioGroup genderGroup;
RadioButton male, female, unclassified;
String strGender;
genderGroup = findViewById(R.id.genderGroup);
male = findViewById(R.id.genderMale);
female = findViewById(R.id.genderFemale);
unclassified = findViewById(R.id.genderUnclassified);

if (genderGroup.getCheckedRadioButtonId() == -1) 
        strGender = null;           //no buttons selected
     else 
        if (male.isChecked())      // one of the radio buttons is checked
            strGender = "1";
         else if (female.isChecked()) 
            strGender = "2";
         else if (unclassified.isChecked()) 
            strGender = "3";
        
    

当我在选择任何单选按钮后打印该值时，它显示为空。 如果你知道怎么做，请帮忙:)谢谢。

已解决感谢 Nilesh。 正确的代码是：

genderGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() 
    @Override
    public void onCheckedChanged(RadioGroup group, int checkedId) 

        if (checkedId == R.id.genderMale) 
          strGender = "1";

         else  if (checkedId == R.id.genderFemale) 
          strGender = "2";
      

    
);

【参考方案1】：

你需要使用RadioGroup.OnCheckedChangeListener

此组中选中的单选按钮更改时要调用的回调的接口定义。

radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() 
    @Override
    public void onCheckedChanged(RadioGroup group, int checkedId) 
        if (checkedId == R.id.genderMale) 
            strGender = "1";
         else  if (checkedId == R.id.genderFemale) 
            strGender = "2";
        
    
);

【参考方案2】：

您应该按如下方式处理：

 // Is the button now checked?
boolean checked = ((RadioButton) view).isChecked();

// Check which radio button was clicked
switch(view.getId()) 
    case R.id.genderMale:
        if (checked)
            strGender = 1;
        break;
    case R.id.genderFemale:
        if (checked)
            strGender = 2;
        break;
    case R.id.genderUnclassified:
        if (checked)
            strGender = 3;
        break;

【参考方案3】：

genderGroup.setOnCheckedChangeListener(new OnCheckedChangeListener() 
    @Override
    public void onCheckedChanged(RadioGroup group, int checkedId) 
        // find which radio button is selected
        if(checkedId == R.id.genderMale) 
            strGender = "1";
         else if(checkedId == R.id.genderFemale) 
            strGender = "2";
         else 
            strGender = "3";
        
    
);

【参考方案4】：

试试这个

String  strGender =" ";

radioGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() 
    @Override
    public void onCheckedChanged(RadioGroup group, int checkedId) 
        switch(checkedId)
            case R.id.genderMale:
                strGender = "1";
                break;
            case R.id.genderFemale:
                strGender = "2";
                break;
            case R.id.genderUnclassified:
                strGender = "3";
                break;
        
    
);

【参考方案5】：

public class MainActivity extends Activity 
    RadioGroup genderGroup;
    @Override
    protected void onCreate(Bundle savedInstanceState) 
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        RadioGroup genderGroup = (RadioGroup) findViewById(R.id.radioGroup1);

        genderGroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() 
        
            public void onCheckedChanged(RadioGroup group, int checkedId) 
                switch(checkedId)
                    case R.id.radio0:
                        // do operations specific to this selection
                            strGender = "1";
                        break;
                    case R.id.radio1:
                        // do operations specific to this selection
                             strGender = "2";
                        break;
                    case R.id.radio2:
                        // do operations specific to this selection
                              strGender = "3";
                        break;
                   
            
        );