实验任务2 标准体重计算器

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一、实验效果图：

二、主要代码：

1、java代码：

（1）MainActivity.java

package com.example.demo08;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.view.View;import android.view.View.OnClickListener;import android.widget.Button;import android.widget.EditText;import android.widget.RadioButton;import android.widget.RadioGroup;public class MainActivity extends Activity {@Overridepublic void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);Button button = (Button) findViewById(R.id.btnClick);button.setOnClickListener(new OnClickListener() {@Overridepublic void onClick(View arg0) {Info info = new Info();int etHeight = Integer.parseInt(((EditText) findViewById(R.id.etHeight)).getText().toString());RadioGroup sex = (RadioGroup) findViewById(R.id.radioGroup1);for (int i = 0; i < sex.getChildCount(); i++) {RadioButton r = (RadioButton) sex.getChildAt(i);if (r.isChecked()) {info.setSex(r.getText().toString());break;}}info.setStature(etHeight);Bundle bundle = new Bundle();bundle.putSerializable("info", info);Intent intent = new Intent(MainActivity.this,ShowActivity.class);intent.putExtras(bundle);startActivity(intent);}});}}

（2）ShowActivity.java

package com.example.demo08;import java.text.DecimalFormat;import java.text.NumberFormat;import android.app.Activity;import android.content.Intent;import android.os.Bundle;import android.widget.TextView;public class ShowActivity extends Activity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_show);TextView sex = (TextView) findViewById(R.id.sex);TextView etHeight = (TextView) findViewById(R.id.etHeight);TextView weight = (TextView) findViewById(R.id.weight);Intent intent = this.getIntent();Bundle bundle = intent.getExtras();Info info = (Info) bundle.getSerializable("info");sex.setText("你是一位" + info.getSex() + "性");etHeight.setText("你的身高是" + info.getStature() + "厘米");weight.setText("你的标准体重是:" + getWeight(info.getSex(), info.getStature())+ "公斤");}private String getWeight(String sex, int etHeight) {String weight = "";NumberFormat format = new DecimalFormat();if (sex.equals("男")) {weight = format.format((etHeight - 80) * 0.7);} else {weight = format.format((etHeight - 70) * 0.6);}return weight;}}

（3）Info.java

package com.example.demo08;import java.io.Serializable;public class Info implements Serializable {private static final long serialVersionUID = 1L;private String sex = "";private int stature = 0;public String getSex() {return sex;}public void setSex(String sex) {this.sex = sex;}public int getStature() {return stature;}public void setStature(int stature) {this.stature = stature;}}

2、布局文件

（1）activity_main.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:id="@+id/tableLayout1"    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" >    <TextView        android:id="@+id/textShowTitle"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentTop="true"        android:layout_centerHorizontal="true"        android:layout_marginTop="5dp"        android:text="计算你的标准体重"        android:textSize="40px" />    <TextView        android:id="@+id/tvSex"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignParentLeft="true"        android:layout_below="@+id/textShowTitle"        android:layout_marginTop="30dp"        android:text="性别：" />    <RadioGroup        android:id="@+id/radioGroup1"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignBottom="@+id/tvSex"        android:layout_centerHorizontal="true"        android:orientation="horizontal" >        <RadioButton            android:id="@+id/remale"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_toRightOf="@+id/tvSex"            android:checked="true"            android:text="男" />        <RadioButton            android:id="@+id/refemale"            android:layout_width="wrap_content"            android:layout_height="wrap_content"            android:layout_alignBaseline="@+id/remale"            android:layout_alignBottom="@+id/remale"            android:layout_toRightOf="@+id/tvSex"            android:text="女" />    </RadioGroup>    <TextView        android:id="@+id/tvWeight"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignRight="@+id/tvSex"        android:layout_below="@+id/tvSex"        android:layout_marginTop="39dp"        android:text="身高：" />    <EditText        android:id="@+id/etHeight"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_alignBaseline="@+id/tvWeight"        android:layout_alignBottom="@+id/tvWeight"        android:layout_alignParentRight="true"        android:background="@android:drawable/edit_text"        android:ems="10"        android:selectAllOnFocus="true" />    <Button        android:id="@+id/btnClick"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:layout_centerHorizontal="true"        android:layout_centerVertical="true"        android:text="计算" /></RelativeLayout>

（2）activity_show.xml

<?xml version="1.0" encoding="utf-8"?><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="match_parent"    android:orientation="vertical"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin" >    <TextView        android:id="@+id/sex"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="null"        android:textSize="10pt" />    <TextView        android:id="@+id/etHeight"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="null"        android:textSize="10pt" />    <TextView        android:id="@+id/weight"        android:layout_width="wrap_content"        android:layout_height="wrap_content"        android:text="null"        android:textSize="10pt" /></LinearLayout>

3、注册文件

<?xml version="1.0" encoding="utf-8"?><manifest xmlns:android="http://schemas.android.com/apk/res/android"    package="com.example.demo08"    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="com.example.demo08.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="com.example.demo08.ShowActivity"            android:label="@string/title_activity_show" >        </activity>    </application></manifest>

三、遇到的问题

1、RadioButton组件的使用，使用这个组件时要用到RadioGroup，才能达到单选按钮的效果；

2、Intent的使用，实现数据在两个活动之间的传输，且不出错；

3、判断性别是男还是女，从而运用不同的计算公式来计算人的体重。

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