作者femlro (主战场:股版)
看板AndroidDev
标题[问题] 徵求android高手解答BMI入门程式
时间Sat Oct 26 20:41:48 2013
总算把BMI给搞定了
可以在安卓测试了
写一下遇到问题的过程
目前是参考网路上的范例发现
会遇到的问题应该是版本的关系
目前我在2013/10/26测试这个调成过後ok了
但是很多涵义还是不懂
第一步是先设定字串
在res\value\string先输入
<?xml version="1.0" encoding="utf-8"?>
<resources>
<string name="action_settings">title</string>
<string name="app_name">BMI</string>
<string name="menu_settings">Settings</string>
<string name="title_activity_bmi">BMI</string>
<string name="bmi_height">身高 (cm)</string>
<string name="bmi_weight">体重 (kg)</string>
<string name="bmi_calculate">计算 BMI 值</string>
</resources>
我发现
action_settings这行好像是大问题
范例有的没加
如果不加会导致R.java读不到
问题很大
想请高手解释这一行为什麽会影响R.java
接着设定BMI出来以後的advice(建议)
要在
res\value
底下新增
xml
这一个动作好像新版的有更改
<?xml version="1.0" encoding="UTF-8"?>
<resources>
<string name="advice_light">你该多吃点</string>
<string name="advice_average">体型很棒喔</string>
<string name="advice_heavy">你该节食了</string>
</resources>
接着回到layout
把以下这些程式码放进去
<RelativeLayout xmlns:android="
http://schemas.android.com/apk/res/android"
xmlns:tools="
http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<TextView
android:id="@+id/textHeight"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/bmi_height" />
<EditText
android:id="@+id/inputHeight"
style="editTextStyle"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/textHeight"
android:inputType="number" />
<TextView
android:id="@+id/textWeight"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/inputHeight"
android:text="@string/bmi_weight" />
<EditText
android:id="@+id/inputWeight"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/textWeight"
android:ems="10"
android:inputType="number" />
<Button
android:id="@+id/buttonCalculate"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/inputWeight"
android:text="@string/bmi_calculate" />
<TextView
android:id="@+id/textResult"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/buttonCalculate" />
<TextView
android:id="@+id/textSuggest"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/textResult" />
</RelativeLayout>
最後最容易有问题的就是这段
想请高手解释这段的语言
package com.practice.bmi;
import java.text.DecimalFormat;
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.TextView;
public class BMI extends Activity {
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_bmi);
//Listen for button clicks
Button button = (Button)findViewById(R.id.buttonCalculate);
button.setOnClickListener(calcBMI);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.bmi, menu);
return true;
}
private OnClickListener calcBMI = new OnClickListener()
{
public void onClick(View v)
{
DecimalFormat nf = new DecimalFormat("0.00");
EditText fieldheight = (EditText)findViewById(R.id.inputHeight);
EditText fieldweight = (EditText)findViewById(R.id.inputWeight);
double height =
Double.parseDouble(fieldheight.getText().toString())/100;
double weight =
Double.parseDouble(fieldweight.getText().toString());
double BMI = weight / (height * height);
TextView result = (TextView)findViewById(R.id.textResult);
result.setText("Your BMI is " + nf.format(BMI));
//Give health advice
TextView fieldsuggest =
(TextView)findViewById(R.id.textSuggest);
if(BMI>25){
fieldsuggest.setText(R.string.advice_heavy);
}else if(BMI<20){
fieldsuggest.setText(R.string.advice_light);
}else {
fieldsuggest.setText(R.string.advice_average);
}
}
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◆ From: 118.233.206.59
※ 编辑: femlro 来自: 118.233.206.59 (10/26 20:42)
1F：推 givemepass:f大跑来android版玩了喔XD 我来帮你解释 10/26 22:52