Java 单键安卓
我正在开发一个简单的BMI计算器,由于我用单选按钮在代码中添加了性别的影响,AVD意外停止。问题是解释IMC功能,我相信radiobutton的ID没有读取,不知道为什么! 请帮我一点忙Java 单键安卓,java,android,android-radiogroup,android-radiobutton,Java,Android,Android Radiogroup,Android Radiobutton,我正在开发一个简单的BMI计算器,由于我用单选按钮在代码中添加了性别的影响,AVD意外停止。问题是解释IMC功能,我相信radiobutton的ID没有读取,不知道为什么! 请帮我一点忙 package com.example.calculadorimc; import android.os.Bundle; import android.app.Activity; import android.view.Menu; import android.view.View; import androi
package com.example.calculadorimc;
import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.widget.EditText;
import android.widget.RadioGroup;
import android.widget.TextView;
public class MainActivity extends Activity {
private RadioGroup rgsexo;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void calculateClickHandler(View view) {
// make sure we handle the click of the calculator button
if (view.getId() == R.id.botaoCalcular) {
// get the references to the widgets
EditText editPeso = (EditText)findViewById(R.id.editPeso);
EditText editAltura = (EditText)findViewById(R.id.editAltura);
TextView imcView = (TextView)findViewById(R.id.imcView);
// get the users values from the widget references
float peso = Float.parseFloat(editPeso.getText().toString());
float altura = Float.parseFloat(editAltura.getText().toString());
// calculate the bmi value
float imcValue = calcularIMC(peso, altura);
// interpret the meaning of the bmi value
String imcInterpretation = interpretIMC(imcValue);
// now set the value in the result text
imcView.setText(imcValue + "-" + imcInterpretation);
}
}
// the formula to calculate the BMI index
// check for http://en.wikipedia.org/wiki/Body_mass_index
private float calcularIMC (float peso, float altura) {
return (float) (peso / (altura * altura));
}
// interpret what BMI means
private String interpretIMC(float imcValue) {
int selectedId = rgsexo.getCheckedRadioButtonId(); // get the id
switch (selectedId) // switch on the button selected
{
case R.id.radioMasc:
if (imcValue < 16) {
return "Magreza Grave";
} else if (imcValue < 18.5) {
return "Magreza Leve";
} else if (imcValue < 25) {
return "Saudável";
} else if (imcValue < 30) {
return "Sobrepeso";
} else if (imcValue < 35){
return "Obesidade Grau I";
} else if (imcValue < 40){
return "Obesidade Grau II";
} else {
return "Obesidade Grau III";
}
case R.id.radioFem:
if (imcValue < 16) {
return "Magreza Grave";
} else if (imcValue < 18.5) {
return "Magreza Leve";
} else if (imcValue < 25) {
return "Saudável";
} else if (imcValue < 30) {
return "Sobrepeso";
} else if (imcValue < 35){
return "Obesidade Grau I";
} else if (imcValue < 40){
return "Obesidade Grau II";
} else {
return "Obesidade Grau III";
}
}
return null;
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
package com.example.calculadorimc;
导入android.os.Bundle;
导入android.app.Activity;
导入android.view.Menu;
导入android.view.view;
导入android.widget.EditText;
导入android.widget.RadioGroup;
导入android.widget.TextView;
公共类MainActivity扩展了活动{
私人放射组rgsexo;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void calculateClickHandler(视图){
//确保我们处理计算器按钮的点击
if(view.getId()==R.id.botaCalcular){
//获取小部件的引用
EditText editPeso=(EditText)findViewById(R.id.editPeso);
EditText editAltura=(EditText)findViewById(R.id.editAltura);
TextView imcView=(TextView)findViewById(R.id.imcView);
//从小部件引用获取用户值
float-peso=float.parseFloat(editPeso.getText().toString());
float altura=float.parseFloat(editAltura.getText().toString());
//计算bmi值
浮动imc值=计算单位(比索,阿尔图拉);
//解释bmi值的含义
字符串IMC解释=解释IMC(IMC值);
//现在在结果文本中设置值
imcView.setText(imcValue+“-”+imc解释);
}
}
//计算体重指数的公式
//查证http://en.wikipedia.org/wiki/Body_mass_index
私人浮动利率(浮动比索、浮动阿尔图拉){
收益(浮动)(比索/(阿尔图拉*阿尔图拉));
}
//解读体重指数的含义
私有字符串解释IMC(浮点IMC值){
int selectedId=rgsexo.getCheckedRadioButtonId();//获取id
开关(selectedId)//打开所选按钮
{
案例R.id.radioMasc:
如果(imc值<16){
返回“马格里扎坟墓”;
}否则如果(IMC值<18.5){
返回“Magreza Leve”;
}否则如果(IMC值<25){
返回“Saudável”;
}否则如果(IMC值<30){
返回“sobrepso”;
}否则如果(IMC值<35){
返回“Obesidade Grau I”;
}否则如果(IMC值<40){
返回“Obesidade Grau II”;
}否则{
返回“Obesidade Grau III”;
}
案例R.id.radioFem:
如果(imc值<16){
返回“马格里扎坟墓”;
}否则如果(IMC值<18.5){
返回“Magreza Leve”;
}否则如果(IMC值<25){
返回“Saudável”;
}否则如果(IMC值<30){
返回“sobrepso”;
}否则如果(IMC值<35){
返回“Obesidade Grau I”;
}否则如果(IMC值<40){
返回“Obesidade Grau II”;
}否则{
返回“Obesidade Grau III”;
}
}
返回null;
}
@凌驾
公共布尔onCreateOptions菜单(菜单){
//为菜单充气;这会将项目添加到操作栏(如果存在)。
getMenuInflater().充气(R.menu.main,menu);
返回true;
}
}
这是我的xml文件
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
tools:context=".MainActivity" >
<RadioGroup
android:id="@+id/rgSexo"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal" >
<RadioButton
android:id="@+id/radioMasc"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:checked="true"
android:text="@string/radioMasc" />
<RadioButton
android:id="@+id/radioFem"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/radioFem" />
</RadioGroup>
<TextView
android:id="@+id/alturaView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/alturaView" />
<EditText
android:id="@+id/editAltura"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="5"
android:inputType="numberDecimal"
android:text="@string/editAltura" >
<requestFocus />
</EditText>
<TextView
android:id="@+id/pesoView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/pesoView" />
<EditText
android:id="@+id/editPeso"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="5"
android:inputType="number"
android:text="@string/editPeso" />
<View
android:layout_width="fill_parent"
android:layout_height="2dip"
android:layout_marginBottom="5dip"
android:layout_marginTop="5dip"
android:background="#111111" />
<Button
android:id="@+id/botaoCalcular"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:onClick="calculateClickHandler"
android:text="@string/botaoCalcular" />
<TextView
android:id="@+id/imcView"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/imcView"
android:textAppearance="?android:attr/textAppearanceLarge" />
</LinearLayout>
在调用
getCheckedRadioButtonId
方法之前,也将rgsexo
RadioGroup实例初始化为:
rgsexo = (RadioGroup)findViewById(R.id.rgSexo);
您没有定义id…,只定义了radiogroup的id
rgsexo = (RadioGroup)findViewById(R.id.rgSexo);
把你的日志放在plzz….上,你得到了什么错误?对于初学者,在
解释imc
方法中使用的变量imcValue
似乎没有定义