① 新建工程
② 修改 main.xml 布局，添加 UI 元素
<?xml version="1.0" encoding="utf-8"?>
<AbsoluteLayout
android:id="@+id/widget0"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android">
<TextView
android:id="@+id/showText"
android:layout_width="wrap_content"
android:layout_height="26px"
android:text="计算你的标准体重!"
android:textSize="25px"
android:layout_x="65px"
android:layout_y="21px">
</TextView>
<TextView
android:id="@+id/text_Sex"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="性别:"
android:layout_x="71px"
android:layout_y="103px">
</TextView>
<TextView
android:id="@+id/text_Height"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="身高:"
android:layout_x="72px"
android:layout_y="169px">
</TextView>
<RadioGroup
android:id="@+id/radioGroup"
android:layout_width="wrap_content"
android:layout_height="37px"
android:orientation="horizontal"
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③ 新建 mylayout.xml，并添加 UI 元素 android:layout_x="124px"
android:layout_y="101px">
<RadioButton
android:id="@+id/Sex_Man"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="男">
</RadioButton>
<RadioButton
android:id="@+id/Sex_Woman"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="女">
</RadioButton>
</RadioGroup>
<EditText
android:id="@+id/height_Edit"
android:layout_width="123px"
android:layout_height="wrap_content"
android:text=""
android:textSize="18sp"
android:layout_x="124px"
android:layout_y="160px">
</EditText>
<Button
android:id="@+id/button_OK"
android:layout_width="80px"
android:layout_height="wrap_content"
android:text="计算"
android:layout_x="125px"
android:layout_y="263px">
</Button>
</AbsoluteLayout>
<?xml version="1.0" encoding="utf-8"?>
<AbsoluteLayout
android:layout_width="fill_parent"
android:layout_height="fill_parent"
xmlns:android="http://schemas.android.com/apk/res/android"
>
<TextView
android:id="@+id/text1"
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④ 新建一个 BMIActivity.java
⑤ 在 AndroidManifest.xml 添加 Activity 定义 android:layout_height="wrap_content"
android:textSize="20sp"
android:layout_x="50px"
android:layout_y="72px"
></TextView>
</AbsoluteLayout>
package package package
package zyf.Ex10_UI;
import import import
import android.app.Activity;
import import import
import android.os.Bundle;
public public public
public classclassclassclass BMIActivity extendsextendsextendsextends Activity {
/** Called when the activity is first created. */
@Override public public public
public voidvoidvoidvoid onCreate(Bundle savedInstanceState) { super
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="zyf.Ex10_UI"
android:versionCode="1"
android:versionName="1.0">
<application android:icon="@drawable/icon"
android:label="@string/app_name">
<activity android:name=".Ex10_UI"
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="BMIActivity"></activity>
</application>
<uses-sdk android:minSdkVersion="2" />
</manifest>
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⑥ 修改 BMIActivity.java 内容 package
package package
package zyf.Ex10_UI;
/* import 相关class */
import import import
import java.text.DecimalFormat;
import import import
import java.text.NumberFormat;
import import import
import android.app.Activity;
import import import
import android.os.Bundle;
import import import
import android.widget.TextView;
public public public
public classclassclassclass BMIActivity extendsextendsextendsextends Activity {
/** Called when the activity is first created. */
@Override public public public
public voidvoidvoidvoid onCreate(Bundle savedInstanceState) { super
super super
super.onCreate(savedInstanceState);
/* 加载main.xml Layout */
setContentView(R.layout.mylayout);
/* 取得Intent 中的Bundle 对象 */
Bundle bunde = thisthisthisthis.getIntent().getExtras();
/* 取得Bundle 对象中的数据 */
String sex = bunde.getString("sex");
double double double
double height = bunde.getDouble("height");
/* 判断性别 */
String sexText = "";
if if if
if (sex.equals("M")) { sexText = "男性";
} elseelseelseelse {
sexText = "女性";
}
/* 取得标准体重 */
String weight = thisthisthisthis.getWeight(sex, height);
/* 设置输出文字 */
TextView tv1 = (TextView) findViewById(R.id.text1);
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");
}
/* 四舍五入的method */
private private private
private String format(doubledoubledoubledouble num) {
NumberFormat formatter = newnewnewnew DecimalFormat("0.00");
String s = formatter.format(num);
return return return return s;
}
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⑦ 修改 mainActivity.java 内容 private
private private
private String getWeight(String sex, doubledoubledoubledouble height) { String weight = "";
if if if
if (sex.equals("M")) {
weight = format((height - 80) * 0.7);
} elseelseelseelse {
weight = format((height - 70) * 0.6);
} return return return
return weight;
} }
package package package
package zyf.Ex10_UI;
/* import 相关class */
import import import
import android.app.Activity;
import import import
import android.content.Intent;
import import import
import android.os.Bundle;
import import import
import android.view.View;
import import import
import android.widget.Button;
import import import
import android.widget.EditText;
import import import
import android.widget.RadioButton;
public public public
public classclassclassclass Ex10_UI extendsextendsextendsextends Activity {
/** Called when the activity is first created. */
@Override public public public
public voidvoidvoidvoid onCreate(Bundle savedInstanceState) { super
super super
super.onCreate(savedInstanceState);
/* 载入main.xml Layout */
setContentView(R.layout.main);
/* 以findViewById()取得Button 对象，并添加onClickListener */
Button ok = (Button) findViewById(R.id.button_OK);
ok.setOnClickListener(newnewnewnew Button.OnClickListener() { public
public public
public voidvoidvoidvoid onClick(View v) { /* 取得输入的身高 */
EditText et = (EditText) findViewById(R.id.height_Edit);
double double double
double height = Double.parseDouble(et.getText().toString());
/* 取得选择的性别 */
String sex = "";
RadioButton rb1 = (RadioButton) findViewById(R.id.Sex_Man);
if if if
if (rb1.isChecked()) { sex = "M";
} elseelseelseelse {
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⑧ 结果：
sex = "F";
}
/* new 一个Intent 对象，并指定class */
Intent intent = newnewnewnew Intent();
intent.setClass(Ex10_UI.thisthisthisthis, BMIActivity.classclassclassclass);
/* new 一个Bundle对象，并将要传递的数据传入 */
Bundle bundle = newnewnewnew Bundle();
bundle.putDouble("height", height);
bundle.putString("sex", sex);
/* 将Bundle 对象assign 给Intent */
intent.putExtras(bundle);
/* 调用Activity EX03_10_1 */
startActivity(intent);
} });
} }