[問題] 剛入門BMI問題

看板AndroidDev作者ms0561188 (說說)時間9年前 (2014/07/07 17:36)推噓0(0推 0噓 20→)

留言20則, 3人參與討論串1/1

如題因為剛入門到手機執行都會錯誤可是卻可以執行先附上程式碼 package com.example.oaa; import java.text.DecimalFormat; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText; import android.widget.TextView; public class oaa extends Activity { /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); //Listen for button clicks Button button = (Button)findViewById(R.id.submit); button.setOnClickListener(calcBMI); } private OnClickListener calcBMI = new OnClickListener() { public void onClick(View v) { DecimalFormat nf = new DecimalFormat("0.00"); EditText fieldheight = (EditText)findViewById(R.id.height); EditText fieldweight = (EditText)findViewById(R.id.weight); 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.result); result.setText("Your BMI is "+nf.format(BMI)); //Give health advice TextView fieldsuggest = (TextView)findViewById(R.id.suggest); 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); } } }; } 另外還有XML的檔案 <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" > <TextView android:id="@+id/height" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="身高 (cm)" /> <EditText android:id="@+id/height" android:layout_width="fill_parent" android:layout_height="wrap_content" android:numeric="integer" android:text="" /> <TextView android:id="@+id/weight" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="體重 (kg)" /> <EditText android:id="@+id/weight" android:layout_width="fill_parent" android:layout_height="wrap_content" android:numeric="integer" android:text="" /> <Button android:id="@+id/submit" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="計算 BMI 值" /> <TextView android:id="@+id/result" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="" /> <TextView android:id="@+id/suggest" android:layout_width="fill_parent" android:layout_height="wrap_content" android:text="" /> </LinearLayout> 煩請高手幫解決謝謝!!! -- -- ※ 發信站: 批踢踢實業坊(ptt.cc), 來自: 210.61.163.55 ※ 文章網址: http://www.ptt.cc/bbs/AndroidDev/M.1404725770.A.307.html

→

corrupt003

07/07 17:56, , 1^F

07/07 17:56, 1^F

→

corrupt003

07/07 17:56, , 2^F

07/07 17:56, 2^F

→

ms0561188

07/07 18:03, , 3^F

07/07 18:03, 3^F