我的第一个Android程序，BMI计算器，分享一下源码

本人电子专业学生，最近要交嵌入式报告，自学了Android相关的知识，整出来了一个Android版的 BMI计算器，

在安卓模拟器中运行情况如下，自我感觉还行，分享一下代码

MainActivity.java

  1 package com.example.bmicalculator1;  2   3 //默认import的两个package  4 import android.app.Activity;  5 import android.os.Bundle;  6   7 import java.text.DecimalFormat;  8 //import java.lang.Math.lang;  9 import com.example.bmicalculator1.R.string; 10  11 import android.view.View; 12 import android.view.View.OnClickListener; 13 import android.widget.Button; 14 import android.widget.EditText; 15 import android.widget.RadioButton; 16 import android.widget.RadioGroup; 17 import android.widget.CheckBox; 18 import android.widget.TextView; 19 import android.app.AlertDialog;//弹窗 20 import android.content.res.ColorStateList; 21 import android.graphics.Color; 22 import android.widget.Toast;   //提示 23  24 //声明一个 public class,名字叫MainActivity 25 //extends是继承（inherit）的关键字 26 //Activity是所导入的包 27 public class MainActivity extends Activity 28 { 29     //定义各种ko变量 30     private EditText et_height=null; 31     private EditText et_weight=null; 32     private Button   bt_submit=null; 33     private Button   bt_exit=null; 34     private TextView tv_result=null; 35     private TextView tv_suggest=null; 36     private TextView tv_target_range=null; 37     private RadioGroup  rg1_height=null; 38     private RadioButton rg1_cms = null; 39     private RadioButton rg1_inchs = null; 40     private RadioGroup  rg2_weight=null;   41     private RadioButton rg2_kgs = null; 42     private RadioButton rg2_lbs = null;       43     private double height=0; 44     private double weight=0; 45     private double heightscale=1.0; 46     private double weightscale=1.0; 47      48     /** Called when the activity is first created**/ 49     @Override  //重写onCreate()这个方法,表示创建时进行一些处理 50     public void onCreate(Bundle savedInstanceState) 51     { 52         super.onCreate(savedInstanceState); 53         setContentView(R.layout.activity_main);//设置显示界面 54         findViewID();  //获取响应的控件 55         setListensersON(); //设置监听器 56  57     } 58         59     private void findViewID(){     60         et_height=(EditText)findViewById(R.id.et_height); 61         et_weight=(EditText)findViewById(R.id.et_weight); 62         bt_submit=(Button)findViewById(R.id.bt_submit); 63         bt_exit=(Button)findViewById(R.id.bt_exit); 64         tv_result=(TextView)findViewById(R.id.tv_result);  65         tv_target_range=(TextView)findViewById(R.id.tv_target_range); 66         tv_suggest=(TextView)findViewById(R.id.tv_suggest);   67         rg1_height=(RadioGroup)findViewById(R.id.rg1_height); 68         rg2_weight=(RadioGroup)findViewById(R.id.rg2_weight); 69     } 70              71     //使用setOnClickListener开启监听事件 72     private void setListensersON(){         73       bt_submit.setOnClickListener(bt_listener); 74       bt_exit.setOnClickListener(bt_listener); 75       rg1_height.setOnCheckedChangeListener(rg1_listener); 76       rg2_weight.setOnCheckedChangeListener(rg2_listener); 77     }     78      79      80     //监听单选按钮组rg1_listener() 81     private RadioGroup.OnCheckedChangeListener rg1_listener= 82             new RadioGroup.OnCheckedChangeListener(){ 83         @Override 84         public void onCheckedChanged(RadioGroup group, int checkedId){ 85             if(checkedId == R.id.rg1_cms) 86             { 87                 heightscale=1.0; 88                 //rg1_cms.setTextColor(Color.rgb(200,100,0)); 89                 Toast.makeText(MainActivity.this,getText(string.str_rg1_cms),Toast.LENGTH_LONG).show(); 90             } 91             else if(checkedId == R.id.rg1_inchs) 92             { 93                 heightscale=2.54; 94                 Toast.makeText(MainActivity.this,getText(string.str_rg1_inchs),Toast.LENGTH_LONG).show(); 95             } 96         } 97          98     }; 99 100     private RadioGroup.OnCheckedChangeListener rg2_listener=101             new RadioGroup.OnCheckedChangeListener(){102         @Override103         public void onCheckedChanged(RadioGroup group, int checkedId){104             if(checkedId == R.id.rg2_kgs)105             { 106                 weightscale=1.0;107                 Toast.makeText(MainActivity.this,getText(string.str_rg2_kgs),Toast.LENGTH_LONG).show();108             }109             else if(checkedId == R.id.rg2_lbs)110             {111                 weightscale=0.45359;112                 Toast.makeText(MainActivity.this,getText(string.str_rg2_lbs),Toast.LENGTH_LONG).show();113             }114         }115         116     };117     118     // Button.OnClickListener来自于android.widget.Button119     private Button.OnClickListener bt_listener = new Button.OnClickListener(){120       public void onClick(View v)121       {122           Button button=(Button)v;123           switch(button.getId())124           {125               case R.id.bt_submit:126               {127                   DecimalFormat nf=new DecimalFormat("0.00");                 128                   try   { weight=weightscale*Double.parseDouble(et_weight.getText().toString());  } 129                   catch (Exception e)    { weight=63*weightscale;  }130                     try   { height=heightscale*Double.parseDouble(et_height.getText().toString())/100; } 131                     catch (Exception e)    { height=heightscale*1.73;}132                     133                   System.out.println(height);  //输出身高134                   System.out.println(weight);  //输出体重135                   136                   //BMI计算公式137                   //Current formula: BMI = weight(kg)/height(m)^2 = 703*weight(lb)/height(in)^2.138                   //New formula: BMI = 1.3*weight(kg)/height(m)^2.5 = 5734*weight(lb)/height(in)^2.5139                   double oldBMI = weight/(height*height);140                   double newBMI = 1.3*weight/(height*height*Math.sqrt(height));141 142                   //计算健康体重的范围143                   double targetupper = 25*(height*height*Math.sqrt(height))/1.3/weightscale;144                   double targetlower = 18.5*(height*height*Math.sqrt(height))/1.3/weightscale;145                   //根据选项，获取体重的单位146                     String units_weight=(String) (weightscale==1.0?getText(string.str_rg2_kgs):getText(string.str_rg2_lbs));147                   if(oldBMI>0 )148                   {149                       tv_result.setText(getText(R.string.str_old_result)+nf.format(oldBMI)+","+getText(R.string.str_new_result)+nf.format(newBMI));150                       tv_target_range.setText("健康体重范围："+nf.format(targetlower)+"~"+nf.format(targetupper)+units_weight);               151                       if(oldBMI <=18.5 ) 152                       {153                         tv_suggest.setText(R.string.advice_light);154                       }155                       else if(oldBMI <= 24)156                       {157                         tv_suggest.setText(R.string.advice_average);158                         //tv_suggest.setTextColor();159                           Toast.makeText(MainActivity.this, getText(string.str_Great),Toast.LENGTH_LONG).show();            160                       }161                       else if(oldBMI <= 28)162                       {163                         tv_suggest.setText(R.string.advice_overweight);164                       }165                       else 166                       {167                         tv_suggest.setText(R.string.advice_fat);168                       }169                       break;                   170                                                      171                   }               172                   else173                   {174                       Toast.makeText(MainActivity.this,getText(string.str_errorin),Toast.LENGTH_LONG).show();175                       break;176                   } 177                   178                   179               }180               case R.id.bt_exit:181               {182                   System.exit(0);//结束activity并释放资源183                   break;184               }185           186           }187           188       }189 190     };191         192   }193

View Code

activity_main.xml

  1 <?xml version="1.0" encoding="utf-8"?>  2 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  3     android:layout_width="match_parent"  4     android:layout_height="match_parent"  5     android:background="#E6E6FA"  6     android:orientation="vertical" >  7   8     <LinearLayout  9         android:layout_width="match_parent" 10         android:layout_height="30dp" 11         android:background="#807CFC00" 12         android:orientation="vertical" > 13  14         <TextView 15             android:id="@+id/title" 16             android:layout_width="110dp" 17             android:layout_height="match_parent" 18             android:layout_gravity="center_horizontal" 19             android:ellipsize="marquee" 20             android:focusable="true" 21             android:focusableInTouchMode="true" 22             android:marqueeRepeatLimit="marquee_forever" 23             android:singleLine="true" 24             android:text="@string/title" 25             android:textSize="16sp" /> 26  27     </LinearLayout> 28  29   <LinearLayout 30     android:layout_width="match_parent" 31     android:layout_height="match_parent" 32     android:background="#E6E6FA" 33     android:paddingLeft="10dp" 34     android:paddingRight="10dp" 35     android:orientation="vertical" > 36     <TextView   37         android:layout_width="wrap_content"  38         android:layout_height="wrap_content"  39         android:text="@string/height" 40         android:padding="2dp"         41         android:textStyle="bold" 42         android:textSize="20sp" 43         android:layout_marginTop="20dp"  44         /> 45      46     <LinearLayout 47         android:orientation="horizontal" 48         android:layout_width="fill_parent" 49         android:layout_height="wrap_content">             50         <EditText 51             android:id="@+id/et_height" 52             android:layout_width="140dp" 53             android:layout_height="wrap_content" 54             android:inputType="numberDecimal" 55             android:paddingLeft="10dp" 56             android:paddingRight="10dp" 57             android:hint="@string/myHeight" 58         /> 59         <RadioGroup 60             android:id="@+id/rg1_height" 61             android:layout_width="match_parent" 62             android:layout_height="wrap_content" 63             android:orientation="horizontal"> 64             <RadioButton 65                 android:id="@+id/rg1_cms" 66                 android:text="@string/str_rg1_cms" 67                 android:checked="true" 68                 android:layout_width="80dip">               69             </RadioButton> 70             <RadioButton 71                 android:id="@+id/rg1_inchs"  72                 android:text="@string/str_rg1_inchs" 73                 android:layout_width="80dip">               74             </RadioButton> 75         </RadioGroup> 76     </LinearLayout> 77      78     <TextView   79         android:layout_width="wrap_content"  80         android:layout_height="wrap_content"  81         android:text="@string/weight" 82         android:padding="2dp" 83         android:textStyle="bold" 84         android:textSize="20sp" 85         android:paddingLeft="20dp" 86         android:paddingRight="10dp" 87         /> 88      89     <LinearLayout 90         android:orientation="horizontal" 91         android:layout_width="fill_parent" 92         android:layout_height="wrap_content"> 93         <EditText 94             android:id="@+id/et_weight" 95             android:layout_width="140dp" 96             android:layout_height="wrap_content" 97             android:inputType="numberDecimal" 98             android:paddingLeft="10dp" 99             android:paddingRight="10dp"100             android:hint="@string/myWeight"    101         />102         <RadioGroup103             android:id="@+id/rg2_weight"104             android:layout_width="fill_parent"105             android:layout_height="wrap_content"106             android:orientation="horizontal">107             <RadioButton108                 android:id="@+id/rg2_kgs"109                 android:text="@string/str_rg2_kgs"110                 android:checked="true"111                 android:layout_width="80dip">              112             </RadioButton>113             <RadioButton114                 android:id="@+id/rg2_lbs" 115                 android:text="@string/str_rg2_lbs"116                 android:layout_width="80dip"> 117             </RadioButton>118         </RadioGroup>119     </LinearLayout>120     121     <LinearLayout122         android:orientation="horizontal"123         android:layout_width="fill_parent"124         android:layout_height="wrap_content"125         >126             <Button 127             android:id="@+id/bt_submit"128             android:layout_width="fill_parent"129             android:layout_height="wrap_content"130             android:layout_weight="1"131             android:textStyle="bold"132             android:textSize="18sp"133             android:text="@string/btSubmit"134             />135             <Button136                 android:id="@+id/bt_exit"137                 android:layout_width="fill_parent"138                 android:layout_height="wrap_content"139                 android:layout_weight="1"140                 android:textStyle="bold"141                 android:textSize="18sp"142                 android:text="@string/btExit"143             />   144     </LinearLayout>145     146     <TextView 147         android:id="@+id/tv_result"148         android:layout_width="fill_parent"149         android:layout_height="wrap_content"150         android:textSize="16sp"151         android:padding="10dp"152         android:color="#808000"153         />154 155     <TextView 156         android:id="@+id/tv_suggest"157         android:layout_width="fill_parent"158         android:layout_height="wrap_content"159         android:textSize="16sp"160         android:padding="10dp"161         android:color="#808000"162         />163    <TextView 164         android:id="@+id/tv_target_range"165         android:layout_width="fill_parent"166         android:layout_height="wrap_content"167         android:textSize="16sp"168         android:padding="10dp"169         android:color="#808000"170         />171 172   </LinearLayout>173 </LinearLayout>

View Code

string.xml

 1 <?xml version="1.0" encoding="utf-8"?> 2 <resources> 3     <string name="app_name">"BMI Caclator"</string> 4     <string name="title">"BMI Calculator by Ausk "</string>        5     <string name="action_settings">Settings</string> 6     <string name="height">身高</string> 7     <string name="myHeight">173</string> 8     <string name="weight">体重</string> 9     <string name="myWeight">63</string>10     <string name="btSubmit">计算BMI</string>11     <string name="btExit">退出</string>12     <string name="str_old_result">你的BMI标准值是</string>13     <string name="str_new_result">新标准值是</string>    14     <string name="str_Great">Great</string>15     <string name="str_errorin">輸入有误</string>    16     <string name="str_unit">单位\:</string>17     <string name="str_rg1_cms">cms</string>18     <string name="str_rg1_inchs">inchs</string>19     <string name="str_rg2_kgs">kgs</string>20     <string name="str_rg2_lbs">lbs</string>21     <string name="advice_light">BMI所属范围：BMI&lt;=18.5,偏瘦,多吃点,不要太瘦哦</string>22     <string name="advice_average">BMI所属范围：18.5&lt;BMI&lt;=24,正常,体型很棒，继续保持!</string>23     <string name="advice_overweight">BMI所属范围：24&lt;BMI&lt;=28,超重,要多锻炼一下呀</string>24     <string name="advice_fat">BMI所属范围：BMI&gt;28,肥胖,不要贪吃哦，多锻炼一下</string>25 </resources>

View Code

更多相关文章

随机推荐