Android一个界面实现标准体重计算器

界面设计

<RelativeLayout xmlns:tools=”http://schemas.android.com/tools”
xmlns:android=”http://schemas.android.com/apk/res/android”
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/textView2″
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”
android:layout_alignLeft=”@+id/textView1″
android:layout_alignParentTop=”true”
android:layout_marginTop=”17dp”
android:text=”@string/hello_world” />

<TextView
android:id=”@+id/textView1″
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”
android:layout_alignParentLeft=”true”
android:layout_alignParentTop=”true”
android:layout_marginLeft=”18dp”
android:layout_marginTop=”68dp”
android:text=”@string/sex” />

<RadioGroup
android:id=”@+id/radioGroup1″
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”
android:layout_alignTop=”@+id/textView1″
android:layout_marginLeft=”25dp”
android:layout_toRightOf=”@+id/textView1″ >

<RadioButton
android:id=”@+id/radio0″
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”
android:text=”@string/sex1″ />

<RadioButton
android:id=”@+id/radio1″
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”
android:text=”@string/sex2″ />
</RadioGroup>

<TextView
android:id=”@+id/TextView01″
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”
android:layout_alignLeft=”@+id/textView1″
android:layout_centerVertical=”true”
android:text=”@string/high” />

<EditText
android:id=”@+id/editText1″
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”
android:layout_centerVertical=”true”
android:layout_toRightOf=”@+id/TextView01″
android:ems=”10″
android:inputType=”number” >

<requestFocus />
</EditText>

<Button
android:id=”@+id/button1″
android:layout_width=”wrap_content”
android:layout_height=”wrap_content”
android:layout_below=”@+id/editText1″
android:layout_marginTop=”72dp”
android:layout_toRightOf=”@+id/textView2″
android:onClick=”ClickHandler”
android:text=”@string/calculate” />

</RelativeLayout>

实现功能：

package org.wwj.calculate;
import android.os.Bundle;
import android.app.Activity;
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;
import android.widget.RadioGroup;
import android.widget.RadioGroup.OnCheckedChangeListener;
import android.widget.Toast;

public class MainActivity extends Activity {

//定义各个组件
private Button cal;
private EditText high;
private RadioGroup sex;
private RadioButton sex1;
private RadioButton sex2;
private Double weight;
String sex3;

protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

//通过findViewById获取对象
cal=(Button) this.findViewById(R.id.button1);
high=(EditText) this.findViewById(R.id.editText1);
sex=(RadioGroup) this.findViewById(R.id.radioGroup1);
sex1=(RadioButton) this.findViewById(R.id.radio0);
sex2=(RadioButton) this.findViewById(R.id.radio1);

//设置Button事件监听
cal.setOnClickListener(new OnClickListener() {
public void onClick(View v) {

/*设置事件监听*/
sex.setOnCheckedChangeListener(new OnCheckedChangeListener() {
@Override
public void onCheckedChanged(RadioGroup group, int checkedId) {

//事件处理
if(checkedId==sex1.getId()){
weight=(Double.parseDouble(high.getText().toString()) – 80) * 0.7;
sex3=”男性”;
}else if(checkedId==sex2.getId()){
weight=(Double.parseDouble(high.getText().toString()) – 70) * 0.6;
sex3=”女性”;
}
}
});

/*Toast显示内容*/
Toast.makeText(MainActivity.this, “你是一位”+sex3+”\n”
+”你的身高是”+high.getText().toString()+”\n”+”你的标准体重是”+weight,
Toast.LENGTH_LONG).show();
}
});
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}

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