如何检查Android中的radiogroup中是否检查了radiobutton？

Question

我需要设置验证,用户必须填写/选择页面中的所有详细信息.如果任何字段是空的想显示Toast message to fill.现在我需要设置验证RadioButton在RadioGroup.我尝试此代码但但无法正常工作.建议我正确的方法.谢谢.

// get selected radio button from radioGroup
int selectedId = gender.getCheckedRadioButtonId();
// find the radiobutton by returned id
selectedRadioButton = (RadioButton)findViewById(selectedId);
// do what you want with radioButtonText (save it to database in your case)
radioButtonText = selectedRadioButton.getText().toString();

if(radioButtonText.matches(""))
{
    Toast.makeText(getApplicationContext(), "Please select Gender", Toast.LENGTH_SHORT).show();
    Log.d("QAOD", "Gender is Null");
}
else
{
    Log.d("QAOD", "Gender is Selected");
}

Answer 1

如果您只想检查一个,RadioButton您可以使用该isChecked功能

if(radioButton.isChecked())
{
  // is checked    
}
else
{
  // not checked
}

如果你有,RadioGroup你可以使用

if (radioGroup.getCheckedRadioButtonId() == -1)
{
  // no radio buttons are checked
}
else
{
  // one of the radio buttons is checked
}

Answer 2

你需要做的就是使用getCheckedRadioButtonId()和isChecked()方法,

if(gender.getCheckedRadioButtonId()==-1)
{
    Toast.makeText(getApplicationContext(), "Please select Gender", Toast.LENGTH_SHORT).show();
}
else
{
    // get selected radio button from radioGroup
    int selectedId = gender.getCheckedRadioButtonId();
    // find the radiobutton by returned id
    selectedRadioButton = (RadioButton)findViewById(selectedId);
    Toast.makeText(getApplicationContext(), selectedRadioButton.getText().toString()+" is selected", Toast.LENGTH_SHORT).show();
}

https://developer.android.com/guide/topics/ui/controls/radiobutton.html

Answer 3

对每个必须检查的radioButton 使用isChecked()函数.

RadioButton maleRadioButton, femaleRadioButton;

maleRadioButton = (RadioButton) findViewById(R.id.maleRadioButton);
femaleRadioButton = (RadioButton) findViewById(R.id.femaleRadioButton);

然后将结果用于if/else案例考虑.

if (maleRadioButton.isChecked() || femaleRadioButton.isChecked()) {
     Log.d("QAOD", "Gender is Selected");
} else {
    Toast.makeText(getApplicationContext(), "Please select Gender", Toast.LENGTH_SHORT).show();
    Log.d("QAOD", "Gender is Null");
}

Answer 4

  rgrp.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(RadioGroup radioGroup, int i) {
            switch(i) {
                case R.id.type_car:
                    num=1;
                    Toast.makeText(getApplicationContext()," Car",Toast.LENGTH_LONG).show();
                    break;
                case R.id.type_bike:
                    num=2;
                    Toast.makeText(getApplicationContext()," Bike",Toast.LENGTH_LONG).show();
                    break;
            }
        }
    });

Answer 5

我使用了以下内容，它对我有用。我使用了布尔验证函数，如果选中单选组中的任何单选按钮，验证函数将返回 true 并进行提交。如果返回 false，则不进行任何提交，并显示“选择性别”的提示：

1. MainActivity.java

   public class MainActivity extends AppCompatActivity {
       private RadioGroup genderRadioGroup;
   
       @Override
       protected void onCreate(Bundle savedInstanceState) {
       super.onCreate(savedInstanceState);
       setContentView(R.layout.activity_main);
   
       //Initialize Radio Group And Submit Button
       genderRadioGroup=findViewById(R.id.gender_radiogroup);
       AppCompatButton submit = findViewById(R.id.btnSubmit);
   
       //Submit Radio Group using Submit Button
       submit.setOnClickListener(new View.OnClickListener() {
           @Override
           public void onClick(View v) {
               //Check Gender radio Group For Selected Radio Button
               if(genderRadioGroup.getCheckedRadioButtonId()==-1){//No Radio Button Is Checked
                   Toast.makeText(getApplicationContext(), "Please Select Gender", Toast.LENGTH_LONG).show();
               }else{//Radio Button Is Checked
                   RadioButton selectedRadioButton = findViewById(genderRadioGroup.getCheckedRadioButtonId());
                   gender = selectedRadioButton == null ? "" : selectedRadioButton.getText().toString().trim();
               }
               //Validate
               if (validateInputs()) {
                   //code to proceed when Radio button is checked
               }
           }
       }
       //Validation - No process is initialized if no Radio button is checked
       private boolean validateInputs() {
           if (genderRadioGroup.getCheckedRadioButtonId()==-1) {
               return false;
           }
           return true;
       }
   }
   

2. 在activity_main.xml中：

   <LinearLayout
           android:layout_width="match_parent"
           android:layout_height="wrap_content"
           android:orientation="horizontal">
   
       <TextView
               android:layout_width="wrap_content"
               android:layout_height="wrap_content"
               android:text="@string/gender"/>
   
       <RadioGroup
               android:id="@+id/gender_radiogroup"
               android:layout_width="wrap_content"
               android:layout_height="wrap_content"
               android:orientation="horizontal">
   
           <RadioButton
                   android:id="@+id/male"
                   android:layout_width="wrap_content"
                   android:layout_height="wrap_content"
                   android:text="@string/male"/>
   
           <RadioButton
                   android:id="@+id/female"
                   android:layout_width="wrap_content"
                   android:layout_height="wrap_content"
                   android:text="@string/female""/>
   
       </RadioGroup>
   
       <android.support.v7.widget.AppCompatButton
           android:id="@+id/btnSubmit"
           android:layout_width="match_parent"
           android:layout_height="wrap_content"
           android:text="@string/submit"/>
   
   </LinearLayout>
   

如果未选择性别单选按钮，则要继续的代码将不会运行。

我希望这有帮助。