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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