android入门级小软件身高体重计算器源代码，初学者可以看看～

android入门级小软件身高体重计算器源代码，初学者可以看看～
一，BMI（身高体重计算器）源代码

package com.android.bmi;
import java.text.DecimalFormat;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.view.Window;
import android.view.WindowManager;
import android.view.View.OnClickListener;
import android.widget.EditText;
public class BMI extends Activity implements OnClickListener {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
super.requestWindowFeature(Window.FEATURE_NO_TITLE);
super.getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN, WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.main);
View confirm=findViewById(R.id.confirm);
confirm.setOnClickListener(this);
View cancel=findViewById(R.id.cancel);
cancel.setOnClickListener(this);
View finish=findViewById(R.id.finish);
finish.setOnClickListener(this);
}
public void onClick(View v){
switch(v.getId())
{
case R.id.confirm:
showBMI();
break;
case R.id.cancel:
EditText fieldheight=(EditText)findViewById(R.id.editheight);
EditText fieldweight=(EditText)findViewById(R.id.editweight);
fieldheight.setText("");
fieldweight.setText("");
break;
case R.id.finish:finish();
}
}
public void showBMI(){
double height,weight;
DecimalFormat dm=new DecimalFormat("0.00");
final EditText fieldheight=(EditText)findViewById(R.id.editheight);
final EditText fieldweight=(EditText)findViewById(R.id.editweight);
String heightstr=fieldheight.getText().toString();
String weightstr=fieldweight.getText().toString();
if("".equals(fieldheight.getText().toString())
||"".equals(fieldweight.getText().toString())
||!isNumeric(heightstr)
||!isNumeric(weightstr))
{
new AlertDialog.Builder(this).setTitle("警告").setMessage("对不起，您输入不正确，请重新输入！").setPositiveButton("关闭",new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
fieldheight.setText("");
fieldweight.setText("");
}
}).show();
}
else
{
height=Double.parseDouble(fieldheight.getText().toString())/100;
weight=Double.parseDouble(fieldweight.getText().toString());
if(height<0.3||height>2.7||weight<5||weight>600){
new AlertDialog.Builder(this).setTitle("测试结果").setMessage("啊哦，你不是来自地球的，快回火星去吧！").setPositiveButton("关闭",new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
fieldheight.setText("");
fieldweight.setText("");
}
}).show();
}
else{
double bmi=weight/(height*height);
String mes;
if(bmi>25) mes="你的BMI值是"+dm.format(bmi)+",拜托，你吃撑了吧，太重啦！！！";
else if(bmi<20) mes="你的BMI值是"+dm.format(bmi)+"，啊哦，太可怜了，你太瘦啦，该补补啦！！！";
else mes="你的BMI值是"+dm.format(bmi)+"，不错，这还差不多！！！";
new AlertDialog.Builder(this).setTitle("测试结果").setMessage(mes).setPositiveButton("关闭",new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
// TODO Auto-generated method stub
fieldheight.setText("");
fieldweight.setText("");
}
}).show();
}
}
}
public static boolean isNumeric(String str){
for(int i=str.length();--i>=0;){
int chr=str.charAt(i);
if(chr<48 || chr>57)
return false;
}
return true;
}
}

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