Question

我已经搜索了类似问题的答案，但无法找到答案。

我似乎无法从我的Java代码中调用subwayMcDClick。我不知道括号中要放什么(View view)。这是我的代码：

   public void submitAnswer(View view) {

    // 1) Which has the most calories? Subway vs. McD's
    subwayMcDClick();

    // 4) Which two have the most caffeine?
    CheckBox brewedCoffeeCheckbox = findViewById(R.id.brewed_coffee_checkbox);
    boolean brewedCoffeeCaffeine = brewedCoffeeCheckbox.isChecked();

    CheckBox brewedBlackTeaCheckbox = findViewById(R.id.brewed_black_tea_checkbox);
    boolean brewedBlackTea = brewedBlackTeaCheckbox.isChecked();

    CheckBox colaCheckbox = findViewById(R.id.cola_checkbox);
    boolean cola = colaCheckbox.isChecked();

    CheckBox rootBeerCheckbox = findViewById(R.id.root_beer_checkbox);
    boolean rootBeer = rootBeerCheckbox.isChecked();

    if (brewedCoffeeCaffeine && brewedBlackTea) {
        caffeine_4 = true;
    } else caffeine_4 = false;

    String answerMessage = createAnswerSummary(caffeine_4);
    displayMessage(answerMessage);

}

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

    // Check which radio button was clicked
    switch (view.getId()) {
        case R.id.subway_vegetarian_button:
            if (checked)
                calories_1 = true;
        case R.id.mcd_big_mac_button:
            if (checked)
                calories_1 = false;
    }
}

Answer 1

只需将复选框作为参数发送，假设'cb'是您想要获得

值的复选框

CheckBox cb = new CheckBox(this);
subwayMcDClick(cb);

Answer 2

首先在XML布局中添加一个RadioGroup，如下所示

<RadioGroup
      android:layout_width="fill_parent"
      android:layout_height="90dp"
      android:layout_below="@+id/imageView"
      android:layout_marginTop="58dp"
      android:weightSum="1"
      android:id="@+id/radioGroup"
      android:layout_alignLeft="@+id/textView2"
      android:layout_alignStart="@+id/textView2"
      android:layout_alignRight="@+id/textView3"
      android:layout_alignEnd="@+id/textView3">

      <RadioButton
         android:layout_width="wrap_content"
         android:layout_height="55dp"
         android:text="SUBWAY_VEGETARIAN"
         android:id="@+id/radioButton"
         android:layout_gravity="center_horizontal"
         android:checked="false"
         android:textSize="25dp" />

      <RadioButton
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="McDonalds"
         android:id="@+id/radioButton2"
         android:layout_gravity="center_horizontal"
         android:checked="false"
         android:textSize="25dp"
         android:layout_weight="0.13" />
   </RadioGroup>

然后，在你的Activity中使用它就像这样

public class MainActivity extends Activity {
      private RadioGroup radioGroup;
      private RadioButton radioButton;
      private Button submit;

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

      //i assume you have a submit button
      submit =(Button)findViewById(R.id.submit);
      submit.setOnClickListener(new View.OnClickListener() {
         @Override
         public void onClick(View v) {
            int selectedId=radioGroup.getCheckedRadioButtonId();
            if(selectedId==R.id.radioButton){
               //do something when subway is selected
            }
            else if(selectedId==R.id.radioButton2){
               //do something when McD is selected
            }
         }
      });
    }
}

你如何在Android中获得单选按钮的价值？

2 个答案: