Android开发实现的标准体重计算器功能示例

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;
  }
}