Java 获取numberFormatException无效的双精度
我在编辑文本中输入一个数值。假设我先得到输入,说“输入”。然后执行Java 获取numberFormatException无效的双精度,java,android,numberformatexception,Java,Android,Numberformatexception,我在编辑文本中输入一个数值。假设我先得到输入,说“输入”。然后执行toString()输入。然后parseDouble()。假设结果是input*2。然后我在编辑文本中设置它。假设 package com.hasibshovon.unitconverter; import android.app.Activity; import android.os.Bundle; import android.view.Menu;
toString()
输入。然后parseDouble()
。假设结果是input*2。然后我在编辑文本中设置它。假设
package com.hasibshovon.unitconverter;
import android.app.Activity;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemSelectedListener;
import android.widget.ArrayAdapter;
import android.widget.EditText;
import android.widget.Spinner;
public class MainActivity extends Activity {
// data source
private static String[] types = { "Angle", "Area", "Bits&Bytes", "Density",
"Electric Current", "Energy", "Force", "Length", "Mass", "Power",
"Pressure", "Speed", "Temperature", "Time", "Volume" };
private static String[] AngleUnits = { "Degree", "Radian", "Grad", "Gon",
"Minute", "Second", "SIgn", "Mil", "Revolution", "Circle", "Turn",
"Quadrant", "Right", "Triangle", "Sextant" };
private static String[] AreaUnits = { "SquareMeter", "SquareKilometer",
"SquareHectometer", "SquareDekameter", "SquareDecimeter",
"SquareCentimeter", "SquareMilimeter", "SquareMicrometer",
"SquareNanometer", "Hectare", "SquareMile", "SquareYard",
"SquareFoot", "SquareInch", "Acre" };
private static String[] BitsBytesUnits = { "bit", "byte", "kilobit",
"kilobyte", "megabit", "megabyte", "gigabit", "gigabyte",
"terabit", "terabyte", "petabit", "petabyte", "exabit", "exabyte" };
private static String[] DensityUnits = { "kilogram/cubicmeter",
"kilogram/cubiccentimeter", "gram/cubicmeter",
"gram/cubiccentimeter", "gram/cubicmilimeter",
"miligram/cubicmeter", "miligram/cubiccentimeter",
"miligram/cubicmilimeter", "exagram/liter", "petagram/liter",
"teragram/liter", "gigagram/liter", "meggram/liter",
"kilogram/liter", "hectogram/liter", "decagram/liter",
"gram/liter", "decigram/liter", "centigram/liter",
"miligram/liter", "microgram/liter", "nanogram/liter",
"picogram/liter" };
private static String[] CurrentUnits = { "ampere", "kiloampere",
"miliampere", "biot", "abaampere", "stataampere" };
private static String[] EnergyUnits = { "joule", "gigajoule", "megajoule",
"kilojoule", "milijoule", "microjoule", "nanojoule", "attojoule" };
private static String[] ForceUnits = { "newton", "dyne", "joul/meter",
"joul/centimeter", "gram-force", "kilogram-force", "kip-force",
"pond", "kilo-pond" };
private static String[] LengthUnits = { "meter", "exameter", "terameter",
"petameter", "gigameter", "megameter", "kilometer", "hectometer",
"dekameter", "decimeter", "centimeter", "milimeter", "micrometer",
"nanometer", "picometer", "femtometer", "attometer" };
private static String[] MassUnits = { "gram", "kilogram", "miligram",
"dalton", "pound", "ounce", "ton", "quarter", "grain" };
private static String[] PowerUnits = { "watt", "megawatt", "horsepower",
"kilocalorie", "joul/hour", "kilojoul/hour", "joul/second" };
private static String[] PressureUnits = { "pascal", "newton/squaremeter",
"bar", "kilogram-force/squaremeter", "ton-force/squarefoot",
"poundal/squarefoot", "atmosphere(atm)" };
private static String[] SpeedUnits = { "meter/second", "kilometer/hour",
"foot/hour", "yard/hour", "mile/hour", "mile/second", "knot" };
private static String[] TemperatureUnits = { "kelvin", "celsius",
"farenheit", "rankine", "reaumur" };
private static String[] TimeUnits = { "second", "milisecond",
"microsecond", "nanosecond", "minute", "hour", "day", "week",
"month", "year", "decade", "century", "millenium" };
private static String[] VolumeUnits = { "cubicmeter", "cubickilometer",
"cubiccentimeter", "liter", "cc", "barrel", "cup", "cubicmile",
"cubicfoot", "cubicyard", "cubicinch", "acre-foot" };
private Spinner spnUnitTypes;
private Spinner spnFromUnit;
private Spinner spnToUnit;
private EditText etFrom;
private EditText etTo;
public String value1, value2;
public double fromDouble;
public double result;
// adapters
ArrayAdapter<String> adaptUnittype;
ArrayAdapter<String> adaptFrom;
ArrayAdapter<String> adaptTo;
// private OnItemSelectedListener UnitLisetener;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// spnUnitTypes.setOnItemSelectedListener(UnitLisetener);
etFrom = (EditText) findViewById(R.id.etConvertFrom);
etTo = (EditText) findViewById(R.id.etToResult);
// initialize view
spnUnitTypes = (Spinner) findViewById(R.id.spnUnitType);
spnFromUnit = (Spinner) findViewById(R.id.spnFromUnit);
spnToUnit = (Spinner) findViewById(R.id.spnToUnit);
// initialize adapter
adaptUnittype = new ArrayAdapter<String>(MainActivity.this,
android.R.layout.simple_spinner_item, types);
// bind adapter and view
spnUnitTypes.setAdapter(adaptUnittype);
spnUnitTypes.setOnItemSelectedListener(new OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> arg0, View arg1,
int postion, long arg3) {
if (types[postion].equals("Time")) {
adaptFrom = new ArrayAdapter<String>(MainActivity.this,
android.R.layout.simple_spinner_item, TimeUnits);
adaptTo = new ArrayAdapter<String>(MainActivity.this,
android.R.layout.simple_spinner_item, TimeUnits);
} else if (types[postion].equals("Mass")) {
adaptFrom = new ArrayAdapter<String>(MainActivity.this,
android.R.layout.simple_spinner_item, MassUnits);
adaptTo = new ArrayAdapter<String>(MainActivity.this,
android.R.layout.simple_spinner_item, MassUnits);
} else if (types[postion].equals("Angle")) {
adaptFrom = new ArrayAdapter<String>(MainActivity.this,
android.R.layout.simple_spinner_item, AngleUnits);
adaptTo = new ArrayAdapter<String>(MainActivity.this,
android.R.layout.simple_spinner_item, AngleUnits);
} else if (types[postion].equals("Area")) {
adaptFrom = new ArrayAdapter<String>(MainActivity.this,
android.R.layout.simple_spinner_item, AreaUnits);
adaptTo = new ArrayAdapter<String>(MainActivity.this,
android.R.layout.simple_spinner_item, AreaUnits);
} else if (types[postion].equals("Density")) {
adaptFrom = new ArrayAdapter<String>(MainActivity.this,
android.R.layout.simple_spinner_item, DensityUnits);
adaptTo = new ArrayAdapter<String>(MainActivity.this,
android.R.layout.simple_spinner_item, DensityUnits);
} else if (types[postion].equals("Bits&Bytes")) {
adaptFrom = new ArrayAdapter<String>(MainActivity.this,
android.R.layout.simple_spinner_item,
BitsBytesUnits);
adaptTo = new ArrayAdapter<String>(MainActivity.this,
android.R.layout.simple_spinner_item,
BitsBytesUnits);
} else if (types[postion].equals("Electric Current")) {
adaptFrom = new ArrayAdapter<String>(MainActivity.this,
android.R.layout.simple_spinner_item, CurrentUnits);
adaptTo = new ArrayAdapter<String>(MainActivity.this,
android.R.layout.simple_spinner_item, CurrentUnits);
} else if (types[postion].equals("Energy")) {
adaptFrom = new ArrayAdapter<String>(MainActivity.this,
android.R.layout.simple_spinner_item, EnergyUnits);
adaptTo = new ArrayAdapter<String>(MainActivity.this,
android.R.layout.simple_spinner_item, EnergyUnits);
} else if (types[postion].equals("Force")) {
adaptFrom = new ArrayAdapter<String>(MainActivity.this,
android.R.layout.simple_spinner_item, ForceUnits);
adaptTo = new ArrayAdapter<String>(MainActivity.this,
android.R.layout.simple_spinner_item, ForceUnits);
} else if (types[postion].equals("Length")) {
adaptFrom = new ArrayAdapter<String>(MainActivity.this,
android.R.layout.simple_spinner_item, LengthUnits);
adaptTo = new ArrayAdapter<String>(MainActivity.this,
android.R.layout.simple_spinner_item, LengthUnits);
} else if (types[postion].equals("Power")) {
adaptFrom = new ArrayAdapter<String>(MainActivity.this,
android.R.layout.simple_spinner_item, PowerUnits);
adaptTo = new ArrayAdapter<String>(MainActivity.this,
android.R.layout.simple_spinner_item, PowerUnits);
} else if (types[postion].equals("Pressure")) {
adaptFrom = new ArrayAdapter<String>(MainActivity.this,
android.R.layout.simple_spinner_item, PressureUnits);
adaptTo = new ArrayAdapter<String>(MainActivity.this,
android.R.layout.simple_spinner_item, PressureUnits);
} else if (types[postion].equals("Speed")) {
adaptFrom = new ArrayAdapter<String>(MainActivity.this,
android.R.layout.simple_spinner_item, SpeedUnits);
adaptTo = new ArrayAdapter<String>(MainActivity.this,
android.R.layout.simple_spinner_item, SpeedUnits);
} else if (types[postion].equals("Temperature")) {
adaptFrom = new ArrayAdapter<String>(MainActivity.this,
android.R.layout.simple_spinner_item,
TemperatureUnits);
adaptTo = new ArrayAdapter<String>(MainActivity.this,
android.R.layout.simple_spinner_item,
TemperatureUnits);
}
spnFromUnit.setAdapter(adaptFrom);
spnToUnit.setAdapter(adaptTo);
spnFromUnit
.setOnItemSelectedListener(new OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent,
View arg1, int pos, long arg3) {
Object item = parent.getItemAtPosition(pos);
value1 = item.toString();
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
});
spnToUnit
.setOnItemSelectedListener(new OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent,
View arg1, int pos, long arg3) {
Object item1 = parent.getItemAtPosition(pos);
value2 = item1.toString();
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
// TODO Auto-generated method stub
}
});
}
@Override
public void onNothingSelected(AdapterView<?> arg0) {
}
});
String fromstr = etFrom.getText().toString();
double fromDouble = Double.parseDouble(fromstr);
}
public void convert(View v) {
if (value1.equals("Degree") && value2.equals("Radian")) {
etTo.setText(String.valueOf(fromDouble*2));
}
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
package com.hasibshovon.unitconverter;
导入android.app.Activity;
导入android.os.Bundle;
导入android.view.Menu;
导入android.view.view;
导入android.widget.AdapterView;
导入android.widget.AdapterView.OnItemSelectedListener;
导入android.widget.ArrayAdapter;
导入android.widget.EditText;
导入android.widget.Spinner;
公共类MainActivity扩展了活动{
//数据源
私有静态字符串[]类型={“角度”、“面积”、“位和字节”、“密度”,
“电流”、“能量”、“力”、“长度”、“质量”、“功率”,
“压力”、“速度”、“温度”、“时间”、“体积”};
私有静态字符串[]角度单位={“度”、“弧度”、“梯度”、“角”,
“分钟”、“秒”、“符号”、“Mil”、“旋转”、“圆圈”、“转弯”,
“象限”、“直角”、“三角形”、“六分仪”};
私有静态字符串[]面积单位={“平方米”,“平方公里”,
“平方百米”、“平方分米”、“平方分米”,
“平方厘米”、“平方毫米”、“平方微米”,
“平方纳米”、“公顷”、“平方英里”、“平方码”,
“平方英尺”、“平方英寸”、“英亩”};
私有静态字符串[]位字节数={“位”、“字节”、“千位”,
“千字节”、“兆字节”、“兆字节”、“千兆字节”、“千兆字节”,
“太比特”、“太字节”、“太比特”、“太比特”、“太字节”、“太比特”、“太比特”、“太字节”、“太字节”、“太字节”};
专用静态字符串[]密度单位={“千克/立方米”,
“千克/立方厘米”、“克/立方厘米”,
“克/立方厘米”、“克/立方厘米”,
“毫克/立方米”、“毫克/立方厘米”,
“毫克/立方毫米”、“埃克/升”、“千兆克/升”,
“太克/升”、“千兆克/升”、“兆克/升”,
“千克/升”、“百克/升”、“十克/升”,
“克/升”、“分克/升”、“厘米/升”,
“毫克/升”、“微克/升”、“纳克/升”,
“皮克/升”};
专用静态字符串[]电流单位={“安培”,“千安培”,
“毫安”、“毕奥”、“阿巴安”、“斯塔安”};
私有静态字符串[]EnergyUnits={“焦耳”、“千兆焦耳”、“兆焦耳”,
“千焦耳”、“毫焦耳”、“微焦耳”、“纳米焦耳”、“阿焦耳”};
专用静态字符串[]力单位={“牛顿”、“达因”、“焦耳/米”,
“焦耳/厘米”、“克力”、“千克力”、“基普力”,
“池塘”、“基洛池塘”};
私有静态字符串[]LengthUnits={“meter”、“exameter”、“terameter”,
“千兆米”、“兆米”、“公里”、“百米”,
“德卡米”、“分米”、“厘米”、“毫米”、“微米”,
“纳米”、“皮米”、“飞秒计”、“阿托米”};
专用静态字符串[]质量单位={“克”、“千克”、“毫克”,
“道尔顿”、“磅”、“盎司”、“吨”、“四分之一”、“谷物”};
专用静态字符串[]功率单位={“瓦特”、“兆瓦”、“马力”,
“千卡”、“焦耳/小时”、“千焦耳/小时”、“焦耳/秒”};
专用静态字符串[]压力单位={“帕斯卡”,“牛顿/平方米”,
“巴”、“千克力/平方米”、“吨力/平方英尺”,
“磅/平方英尺”、“大气(atm)”;
专用静态字符串[]速度单位={“米/秒”、“公里/小时”,
“英尺/小时”、“码/小时”、“英里/小时”、“英里/秒”、“结”};
私有静态字符串[]TemperatureUnits={“开尔文”,“摄氏度”,
“法伦海特”、“兰金”、“雷乌穆尔”};
私有静态字符串[]时间单位={“秒”,“毫秒”,
“微秒”、“纳秒”、“分钟”、“小时”、“日”、“周”,
“月”、“年”、“十年”、“世纪”、“千年”};
私有静态字符串[]VolumeUnits={“cubicmeter”、“cubickilometer”,
“立方厘米”、“升”、“立方厘米”、“桶”、“杯”、“立方厘米”,
“cubicfoot”、“cubicyard”、“cubicinch”、“acre foot”};
私人纺纱机;
私人纺纱机;
私人旋转装置;
私人编辑文本;
私人编辑;
公共字符串值1、值2;
公共双从双;
公众的双重结果;
//适配器
阵列适配器单元类型;
阵列自适应;
阵列自适应;
//私用监听单元选择监听单元;
@凌驾
创建时受保护的void(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//spnUnitTypes.setOnItemSelectedListener(UnitLisetener);
etFrom=(EditText)findViewById(R.id.etConvertFrom);
etTo=(EditText)findViewById(R.id.etToResult);
//初始化视图
spnunitypes=(微调器)findViewById(R.id.spnunitype);
spnFromUnit=(微调器)findViewById(R.id.spnFromUnit);
spnToUnit=(微调器)findViewById(R.id.spnToUnit);
//初始化适配器
AdapteUnitType=new ArrayAdapter(MainActivity.this,
android.R.layout.simple\u微调器(项目、类型);
//绑定适配器和视图
设置适配器(AdapteUnitType);
setOnItemSelectedListener(新的OnItemSelectedListener()){
@凌驾
已选择公共视图(AdapterView arg0、视图arg1、,
内部位置,长arg3){
if(类型[position].equals(“时间”)){
AdapteFrom=新阵列适配器(MainActivity.this,
android.R.layout.simple_微调器_项,时间单位);
adapto=新阵列适配器(MainActivity.this,
android.R.layout.simple_微调器_项,时间单位);
}else if(类型[position].equals(“质量”)){
AdapteFrom=新阵列适配器(MainActivity.this,
android.R.layout.simple_微调器_项目,质量单位);
String fromstr = etFrom.getText().toString();
try {
double fromDouble = Double.parseDouble(fromstr);
} catch (NumberFormatException e) {
System.out.println(fromstr)
}