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我對Android應用程序開發相當陌生,只是學習製作一些簡單的應用程序。所以我決定製作一個BMI計算器。我做了一個界面,用戶將使用微調器選擇單位的高度和重量。然後,點擊按鈕後,我會將EditText上的值的字符串解析爲double。也可以獲得用戶選擇的旋轉器項目(它們是高度和重量的單位)。我設法通過使用setText得到正確的值,並返回用戶輸入的值和單位。但是,這些價值並沒有按照我想要的方式轉變。 if-else語句在這裏可能是錯誤的。Android:這些值未被轉換爲千克和米的等效值
package com.dirk.myfirstapp;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Spinner;
import android.widget.TextView;
public class MainActivity extends Activity {
TextView output;
EditText weightInput, heightInput;
Button calculate;
double height, weight, BMI;
String heightInputString, weightInputString, weightUnit, heightUnit;
Spinner heightUnitSpinner, weightUnitSpinner;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Button calculate = (Button) findViewById(R.id.button1);
output = (TextView) findViewById(R.id.textView4);
weightInput = (EditText) findViewById(R.id.editText1);
heightInput = (EditText) findViewById(R.id.editText2);
heightUnitSpinner = (Spinner) findViewById(R.id.spinnerHeight);
weightUnitSpinner = (Spinner) findViewById(R.id.spinnerWeight);
calculate.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
//PARSE STRINGS
heightInputString = heightInput.getText().toString();
height = Double.parseDouble(heightInputString);
weightInputString = weightInput.getText().toString();
weight = Double.parseDouble(weightInputString);
weightUnit = weightUnitSpinner.getSelectedItem().toString();
heightUnit = heightUnitSpinner.getSelectedItem().toString();
// CONVERT FIRST TO SI UNITS
// CONVERT WEIGHT TO kilogrammes
if (weightUnit == "lbs") {
weight = weight * 0.453592;
}
// CONVERT HEIGHT TO meters
if (heightUnit == "cm") {
height = height/100;
} else if (heightUnit == "in") {
height = height * 0.0254;
}
BMI = weight/(height * height);
output.setText("Your BMI is " + BMI);
}
});
}
}
‘值不轉換我想要的方式’你能告訴我們他們是如何轉換的?真的很難理解..結果是什麼? – 2013-05-10 18:51:45