所以，基本上这很简单。我正在创建一个小费计算器应用程序，允许用户输入关于他们的用餐/服务的大量信息，并且我应该在计算按钮旁边的文本字段中计算底部的结果。我遇到的麻烦只是从＆＃34;选择提示中选择一个单选按钮：＆＃34;选项。我已经尝试将RadioGroup小部件添加到我的应用程序中，但我不知道如何使我的单选按钮符合它，也不知道如何在我的应用程序中添加无线电组而不影响当前的大小和位置单选按钮。这是我的应用程序的外观：http://tinypic.com/r/yc46t/8
MyActivity.java
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_my);
final EditText enteredFoodAmount = (EditText)findViewById(R.id.foodAmount);
final EditText enteredDrinkAmount = (EditText)findViewById(R.id.drinkAmount);
final EditText enteredTaxAmount = (EditText)findViewById(R.id.taxAmount);
final RadioButton tenSelected = (RadioButton)findViewById(R.id.tenPercent);
final RadioButton fifteenSelected = (RadioButton)findViewById(R.id.fifteenPercent);
final RadioButton twentySelected = (RadioButton)findViewById(R.id.twentyPercent);
final TextView displayedFoodAmount = (TextView)findViewById(R.id.theFoodAmount);
final TextView displayedDrinkAmount = (TextView)findViewById(R.id.theDrinkAmount);
final TextView displayedTaxAmount = (TextView)findViewById(R.id.theTaxAmount);
final TextView displayedTipAmount = (TextView)findViewById(R.id.theTipAmount);
final Button calculateButton = (Button)findViewById(R.id.calculate);
final TextView displayedCalculation = (TextView)findViewById(R.id.calculatedAmount);
final RadioGroup radiogroup = (RadioGroup) findViewById(R.id.myRadioGroup);
calculateButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
double food = Double.parseDouble(enteredFoodAmount.getText().toString());
double drink = Double.parseDouble(enteredDrinkAmount.getText().toString());
double tax = Double.parseDouble(enteredTaxAmount.getText().toString()) / 100.0;
double tip;
double calculation;
if (tenSelected.isChecked()){
twentySelected.setChecked(false);
tip = 0.10;
displayedTipAmount.setText(Double.toString(tip * 100.0) + "%");
displayedFoodAmount.setText("$" + Double.toString(food));
displayedDrinkAmount.setText("$" + Double.toString(drink));
displayedTaxAmount.setText(Double.toString(tax * 100.0) + "%");
double myTax = (food + drink) * tax;
double myTip = (food + drink) * tip;
calculation = (food + drink) + myTax + myTip;
displayedCalculation.setText("$" + Double.toString(calculation));
}
else if (twentySelected.isChecked()){
tenSelected.setChecked(false);
tip = 0.20;
displayedTipAmount.setText(Double.toString(tip * 100.0) + "%");
displayedFoodAmount.setText("$" + Double.toString(food));
displayedDrinkAmount.setText("$" + Double.toString(drink));
displayedTaxAmount.setText(Double.toString(tax * 100.0) + "%");
double myTax = (food + drink) * tax;
double myTip = (food + drink) * tip;
calculation = (food + drink) + myTax + myTip;
displayedCalculation.setText("$" + Double.toString(calculation));
}
else if (fifteenSelected.isChecked()){
tip = 0.15;
displayedTipAmount.setText(Double.toString(tip * 100.0) + "%");
displayedFoodAmount.setText("$"+ Double.toString(food));
displayedDrinkAmount.setText("$" + Double.toString(drink));
displayedTaxAmount.setText(Double.toString(tax * 100.0) + "%");
double myTax = (food + drink) * tax;
double myTip = (food + drink) * tip;
calculation = (food + drink) + myTax + myTip;
displayedCalculation.setText("$" + Double.toString(calculation));
}
activity_my.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
tools:context=".MyActivity"
android:id="@+id/layoutt">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="@string/food_total"
android:id="@+id/foodTotal"
android:layout_alignParentTop="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="@string/drink_total"
android:id="@+id/drinkTotal"
android:layout_below="@+id/foodTotal"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="38dp"/>
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="numberDecimal"
android:ems="10"
android:id="@+id/foodAmount"
android:layout_alignParentTop="true"
android:layout_alignParentRight="true"
android:layout_alignParentEnd="true"/>
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="numberDecimal"
android:ems="10"
android:id="@+id/drinkAmount"
android:layout_alignBottom="@+id/drinkTotal"
android:layout_alignLeft="@+id/foodAmount"
android:layout_alignStart="@+id/foodAmount"/>
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/ten_percent"
android:id="@+id/tenPercent"
android:layout_toEndOf="@+id/drinkTotal"
android:layout_above="@+id/fifteenPercent"
android:layout_toRightOf="@+id/drinkTotal"/>
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/fifteen_percent"
android:id="@+id/fifteenPercent"
android:layout_toEndOf="@+id/drinkTotal"
android:layout_centerVertical="true"
android:layout_alignLeft="@+id/tenPercent"
android:layout_alignStart="@+id/tenPercent"
android:layout_toRightOf="@+id/drinkTotal"/>
<RadioButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/twenty_percent"
android:id="@+id/twentyPercent"
android:layout_toEndOf="@+id/drinkTotal"
android:layout_below="@+id/fifteenPercent"
android:layout_alignLeft="@+id/fifteenPercent"
android:layout_alignStart="@+id/fifteenPercent"
android:layout_toRightOf="@+id/drinkTotal"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/calculate"
android:id="@+id/calculate"
android:layout_alignParentBottom="true"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:ems="10"
android:id="@+id/calculatedAmount"
android:layout_alignBottom="@+id/calculate"
android:layout_alignLeft="@+id/drinkAmount"
android:layout_alignStart="@+id/drinkAmount"
android:layout_alignTop="@+id/calculate"
android:textSize="22sp"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Total Tax"
android:id="@+id/tax"
android:layout_marginTop="29dp"
android:layout_below="@+id/drinkAmount"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"/>
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="numberDecimal"
android:ems="10"
android:id="@+id/taxAmount"
android:layout_alignBottom="@+id/tax"
android:layout_alignLeft="@+id/drinkAmount"
android:layout_alignStart="@+id/drinkAmount"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="@string/select_tip"
android:id="@+id/selectTip"
android:layout_above="@+id/tenPercent"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall"
android:text="@string/the_food"
android:id="@+id/theFood"
android:layout_marginTop="37dp"
android:layout_below="@+id/twentyPercent"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall"
android:text="@string/the_drink"
android:id="@+id/theDrink"
android:layout_below="@+id/theFood"
android:layout_alignParentLeft="true"
android:layout_alignParentStart="true"
android:layout_marginTop="35dp"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall"
android:text="@string/the_tax"
android:id="@+id/theTax"
android:layout_alignTop="@+id/theFood"
android:layout_toRightOf="@+id/twentyPercent"
android:layout_toEndOf="@+id/twentyPercent"
android:layout_marginLeft="44dp"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall"
android:text="@string/the_tip"
android:id="@+id/theTip"
android:layout_toEndOf="@+id/twentyPercent"
android:layout_alignTop="@+id/theDrink"
android:layout_alignLeft="@+id/theTax"
android:layout_alignStart="@+id/theTax"
android:layout_toRightOf="@+id/twentyPercent"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall"
android:id="@+id/theFoodAmount"
android:layout_toStartOf="@+id/calculatedAmount"
android:layout_toRightOf="@+id/calculatedAmount"
android:layout_toLeftOf="@+id/calculatedAmount"
android:text="--"
android:layout_alignTop="@+id/theFood"
android:layout_alignLeft="@+id/theDrinkAmount"
android:layout_alignStart="@+id/theDrinkAmount"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall"
android:text="--"
android:id="@+id/theDrinkAmount"
android:layout_toEndOf="@+id/theDrink"
android:layout_alignTop="@+id/theDrink"
android:layout_toRightOf="@+id/theDrink"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall"
android:text="--"
android:id="@+id/theTaxAmount"
android:layout_toEndOf="@+id/theTax"
android:layout_alignTop="@+id/theTax"
android:layout_toRightOf="@+id/theTax"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceSmall"
android:text="--"
android:id="@+id/theTipAmount"
android:layout_toEndOf="@+id/theTip"
android:layout_toLeftOf="@+id/theTip"
android:layout_toStartOf="@+id/theTip"
android:layout_toRightOf="@+id/theTip"
android:layout_alignTop="@+id/theTip"
android:layout_alignRight="@+id/calculatedAmount"
android:layout_alignEnd="@+id/calculatedAmount"/>
<RadioGroup
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_alignTop="@+id/tenPercent"
android:layout_toRightOf="@+id/selectTip"
android:layout_toEndOf="@+id/selectTip"
android:layout_above="@+id/theFood"
android:layout_toLeftOf="@+id/theTip"
android:layout_toStartOf="@+id/theTip"
android:id="@+id/myRadioGroup"
android:baselineAligned="false">
</RadioGroup>
</RelativeLayout>
答案 0 :(得分：0)
收音机按钮必须是RadioGroup内的儿童。
<RelativeLayout ... >
<!-- some views -->
<RadioGroup ... >
<RadioButton ... />
<RadioButton ... />
<RadioButton ... />
</RadioGroup>
<!-- more views -->
</RelativeLayout>