标准体重计算器

                     （标准体重计算器）效果图

     

一. 在res文件中，values文件中string.xml

<?xml version="1.0" encoding="utf-8"?><resources>    <string name="app_name">"标准体重计算器"</string>    <string name="action_settings">Settings</string>    <string name="hello_world">Hello world!</string>    <string name="lable_biaoti">计算你的标准体重</string>    <string name="lable_xingbie">性别</string>    <string name="radio_nan">男</string>    <string name="radio_nu">女</string>    <string name="lable_shengao">身高（单位：CM）</string>    <string name="button_main">计算</string>    <string name="button_show">返回上一页</string>    <string name="title_activity_show">ShowActivity</string></resources>

二. 在res.文件中，layout文件中activity_main.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:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context=".MainActivity" >    <Button        android:id="@+id/button1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignRight="@+id/editText1"        android:layout_below="@+id/editText1"        android:layout_marginTop="47dp"        android:text="@string/button_main" />       <TextView        android:id="@+id/textView1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignTop="@+id/radiogroupe"        android:text="@string/lable_biaoti" />    <TextView        android:id="@+id/textView3"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_below="@+id/radiogroupe"        android:layout_marginTop="44dp"        android:text="@string/lable_shengao" />    <EditText        android:id="@+id/editText1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_below="@+id/textView3"        android:layout_centerHorizontal="true"        android:layout_marginTop="18dp"        android:ems="10" >    </EditText>    <RadioGroup        android:id="@+id/radiogroupe"        android:layout_width="wrap_content"        android:layout_height="wrap_content" >         <TextView        android:id="@+id/textView2"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_below="@+id/textView1"        android:layout_marginTop="18dp"        android:layout_toLeftOf="@+id/editText1"        android:text="@string/lable_xingbie" />        <RadioButton            android:id="@+id/radioButton1"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_alignRight="@+id/textView1"            android:layout_alignTop="@+id/textView2"            android:text="@string/radio_nan" />        <RadioButton            android:id="@+id/radioButton2"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_marginRight="40dp"            android:text="@string/radio_nu" />    </RadioGroup></RelativeLayout>

  注：在这个布局文件中有一个   <RadioGroup >  </RadioGroup> 这个控件主要是把 两个<RadioButton> </RadioButton>包围起来，意思就是这样能实现两个控件的单项选                 择。

三. 在res.文件中，layout文件中activity_show.xml,这个布局文件就是在前面activity_main.xml跳转过来以后显示前面所带过来的数据。

<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:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context=".ShowActivity" >    <Button        android:id="@+id/button2"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentLeft="true"        android:layout_alignParentTop="true"        android:layout_marginLeft="80dp"        android:layout_marginTop="165dp"        android:text="@string/button_show" />    <TextView        android:id="@+id/textView4"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentLeft="true"        android:layout_alignParentTop="true"        android:layout_marginLeft="46dp"        android:layout_marginTop="39dp"        android:text="TextView" /></RelativeLayout>

四. src文件中，MainActivity.java

package cn.edu.bzu.tizhongjisuan;import android.os.Bundle;import android.app.Activity;import android.content.Intent;import android.support.v4.view.MenuItemCompat.OnActionExpandListener;import android.view.Menu;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.RadioButton;public class MainActivity extends Activity implements OnClickListener {protected int code ;private RadioButton radioButton1, radioButton2;private EditText editText;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);Button bu = (Button) findViewById(R.id.button1);bu.findViewById(R.id.button1).setOnClickListener(this);radioButton1 = (RadioButton) findViewById(R.id.radioButton1);radioButton2 = (RadioButton) findViewById(R.id.radioButton2);editText = (EditText) findViewById(R.id.editText1);}public void onClick(View v) {int id = v.getId();if (id == R.id.button1) {double height = Double.parseDouble(editText.getText().toString());String sex = "";RadioButton rb1 = (RadioButton) findViewById(R.id.radioButton1);if (rb1.isChecked()) {sex = "M";} else {sex = "F";}Intent intent = new Intent();intent.setClass(MainActivity.this, ShowActivity.class);Bundle bundle = new Bundle();bundle.putDouble("height", height);bundle.putString("sex", sex);intent.putExtras(bundle);startActivityForResult(intent, code);}}protected void onActivityResult(int requestCode, int resultCode, Intent data) {super.onActivityResult(requestCode, resultCode, data);switch (requestCode) {case RESULT_OK:Bundle bunde = data.getExtras();String sex = bunde.getString("sex");double height = bunde.getDouble("height");editText.setText("" + height);if (sex.equals("M")) {radioButton1.setChecked(true);} else {radioButton2.setChecked(false);}break;default:break;}}}

五 . src文件中，ShowActivity.java

package cn.edu.bzu.tizhongjisuan;import java.text.DecimalFormat;import java.text.NumberFormat;import javax.security.auth.PrivateCredentialPermission;import android.os.Bundle;import android.app.Activity;import android.content.Intent;import android.text.format.Formatter;import android.view.Menu;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.TextView;public class ShowActivity extends Activity implements OnClickListener {private Intent intent;private Bundle bundle;protected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_show);Button b1 = (Button) findViewById(R.id.button2);findViewById(R.id.button2).setOnClickListener(this);bundle = this.getIntent().getExtras();String sex = bundle.getString("sex");double height = bundle.getDouble("height");String sexText = "";if (sex.equals("M")) {sexText = "男性";} else {sexText = "女性";}String weight = this.getWeight(sex, height);TextView tv1 = (TextView) findViewById(R.id.textView4);tv1.setText("你是一位" + sexText + "\n你的身高是" + height + "厘米\n你的标准体重是"+ weight + "公斤");}private String format(double num) {NumberFormat formatter = new DecimalFormat("0.00");String s = formatter.format(num);return s;}// 计算体重和身高的公式private String getWeight(String sex, double height) {String weight = "";if (sex.equals("M")) {weight = format((height - 80) * 0.7);} else {weight = format((height - 70) * 0.6);}return weight;}@Overridepublic void onClick(View v) {// TODO Auto-generated method stubint id = v.getId();if (id == R.id.button2) {ShowActivity.this.setResult(RESULT_OK, intent);ShowActivity.this.finish();}}}

六. 在AndroidManifest.xml中声明。

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="cn.edu.bzu.tizhongjisuan"    android:versionCode="1"    android:versionName="1.0" >    <uses-sdk        android:minSdkVersion="8"        android:targetSdkVersion="18" />    <application        android:allowBackup="true"        android:icon="@drawable/ic_launcher"        android:label="@string/app_name"        android:theme="@style/AppTheme" >        <activity            android:name="MainActivity"            android:label="@string/app_name" >            <intent-filter>                <action android:name="android.intent.action.MAIN" />                <category android:name="android.intent.category.LAUNCHER" />            </intent-filter>        </activity>        <activity            android:name="ShowActivity"            android:label="@string/title_activity_show" >        </activity>    </application></manifest>