Android开发实现的标准体重计算器功能示例

<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>

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;  }}