从 EditText 获取数据输入时，导致应用程序崩溃 Android 的 NumberFormat 错误
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【中文标题】从 EditText 获取数据输入时，导致应用程序崩溃 Android 的 NumberFormat 错误【英文标题】：NumberFormat Error Causing App to Crash Android When Taking Data Inputs From EditText 【发布时间】：2017-09-01 02:01:56 【问题描述】：我正在尝试获取用户输入，然后将它们解析为双精度数。我什至添加了一种方法来检查它们是否为空，然后将它们设置为 0，但它仍然崩溃并给我错误。
这是我的代码：
package com.example.alexlevine.oceanapp;
import android.app.Activity;
import android.content.Context;
import android.content.DialogInterface;
import android.content.SharedPreferences;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import com.google.gson.Gson;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Calendar;
import java.util.Date;
import java.util.List;
public class CarbonCalcActivity extends AppCompatActivity
//household energy
double electricity;
double naturalGas;
double fuelOil;
double propane;
EditText elecunit;
EditText elecbill;
EditText gasunit;
EditText gasbill;
EditText fuelunit;
EditText fuelbill;
EditText propunit;
EditText propbill;
//transportation
double vehicle1;
double vehicle2;
double vehicle3;
double publicTransport;//.42*number of miles
double airTravel;
EditText v1mpw;
EditText v1mpg;
EditText v2mpw;
EditText v2mpg;
EditText v3mpw;
EditText v3mpg;
EditText pub;
EditText air;
//food
double totalFood;
double meatFishEggs;
double cerealBakery;
double dairy;
double fruitVegetable;
double eatingOut;
double otherFoods;
EditText meat;
EditText cer;
EditText da;
EditText fv;
EditText out;
EditText otherf;
//services and goods
double totalSG;
double clothing;
double furnishHousehold;
double otherGoods;
double services;
double total;
EditText sg;
EditText cloth;
EditText furn;
EditText otherg;
EditText serv;
Button submit;
List<double[]> dataValues;
Context activity;
@Override
protected void onCreate(Bundle savedInstanceState)
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_carbon_calc);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
/*
SharedPreferences sharedPref = getActivity().getPreferences(Context.MODE_PRIVATE);
SharedPreferences.Editor editor = sharedPref.edit();
editor.putInt(getString(R.string.saved_high_score), newHighScore);
editor.commit();*/
activity = CarbonCalcActivity.this;
dataValues= new ArrayList<double[]>();
submit = (Button) findViewById(R.id.submitb);
public void onBtnClicked(View v)
if(v.getId() == R.id.submitb)
elecunit = (EditText) findViewById(R.id.kwh);
elecbill = (EditText) findViewById(R.id.elec);
if(elecunit != null && elecbill != null)
electricity = (Integer.parseInt(elecbill.getText().toString())/Integer.parseInt(elecunit.getText().toString()))*1.37*12;
else
electricity = 0;
gasunit = (EditText) findViewById(R.id.cf);
gasbill = (EditText) findViewById(R.id.gas);
if(gasunit != null && gasbill != null)
naturalGas = (Integer.parseInt(gasbill.getText().toString())/Integer.parseInt(gasunit.getText().toString()))*120.61*12;
else
naturalGas = 0;
fuelunit = (EditText) findViewById(R.id.fogal);
fuelbill = (EditText) findViewById(R.id.fo);
if(fuelunit != null && fuelbill != null)
fuelOil = (Integer.parseInt(fuelbill.getText().toString())/Integer.parseInt(fuelunit.getText().toString()))*22.37*12;
else
fuelOil = 0;
propunit = (EditText) findViewById(R.id.progal);
propbill = (EditText) findViewById(R.id.pro);
if(propunit != null && propbill != null)
propane = (Integer.parseInt(propbill.getText().toString())/Integer.parseInt(propunit.getText().toString()))*12.17*12;
else
propane = 0;
v1mpg = (EditText) findViewById(R.id.v1mpg);
v1mpw = (EditText) findViewById(R.id.v1mpw);
if(v1mpg != null && v1mpw != null)
vehicle1 = ((Integer.parseInt(v1mpw.getText().toString())*52)/(Integer.parseInt(v1mpg.toString()))*19.4*(100/95));
else
vehicle1 = 0;
v2mpg = (EditText) findViewById(R.id.v2mpg);
v2mpw = (EditText) findViewById(R.id.v2mpw);
if(v2mpg != null && v2mpw != null)
vehicle2 = ((Integer.parseInt(v2mpw.getText().toString())*52)/Integer.parseInt(v2mpg.toString()))*19.4*(100/95);
else
vehicle2 = 0;
v3mpg = (EditText) findViewById(R.id.v3mpg);
v3mpw = (EditText) findViewById(R.id.v3mpw);
if(v3mpg != null && v3mpw != null)
vehicle3 = ((Integer.parseInt(v3mpw.getText().toString())*52)/Integer.parseInt(v3mpg.toString()))*19.4*(100/95);
else
vehicle3 = 0;
pub = (EditText) findViewById(R.id.pubmpy);
if(pub != null)
publicTransport = (Integer.parseInt(pub.toString()))*.42;
else
publicTransport = 0;
air = (EditText) findViewById(R.id.airmpy);
if(air != null)
airTravel = (Integer.parseInt(air.toString()))*223*1.2*1.9*.0022;
else
airTravel = 0;
meat = (EditText) findViewById(R.id.meat);
if(meat != null)
meatFishEggs = (Integer.parseInt(meat.toString()))*1452*12*.0022;
else
meatFishEggs = 0;
cer = (EditText) findViewById(R.id.cereal);
if(cer != null)
cerealBakery = (Integer.parseInt(cer.toString()))*741*12*.0022;
else
cerealBakery = 0;
da = (EditText) findViewById(R.id.dairy);
if(da != null)
dairy = (Integer.parseInt(cer.toString()))*1911*12*.0022;
else
dairy = 0;
fv = (EditText) findViewById(R.id.fruit);
if(fv != null)
fruitVegetable = (Integer.parseInt(fv.toString()))*1176*12*.0022;
else
fruitVegetable = 0;
out = (EditText) findViewById(R.id.out);
if(out != null)
eatingOut = (Integer.parseInt(out.toString()))*368*12*.0022;
else
eatingOut = 0;
otherf = (EditText) findViewById(R.id.otherf);
if(otherf != null)
otherFoods = (Integer.parseInt(otherf.toString()))*467*12*.0022;
else
otherFoods = 0;
totalFood = meatFishEggs+cerealBakery+dairy+fruitVegetable+eatingOut+otherFoods;
cloth = (EditText) findViewById(R.id.cloth);
if(cloth != null)
clothing = (Integer.parseInt(cloth.toString()))*436*12*.0022;
else
clothing = 0;
furn = (EditText) findViewById(R.id.furnish);
if(furn != null)
furnishHousehold = (Integer.parseInt(furn.toString()))*459*12*.0022;
else
furnishHousehold = 0;
otherg = (EditText) findViewById(R.id.otherg);
if(otherg != null)
otherGoods = (Integer.parseInt(otherg.toString()))*338*12*.0022;
else
otherGoods = 0;
serv = (EditText) findViewById(R.id.serv);
if(serv != null)
services = (Integer.parseInt(serv.toString()))*178*12*.0022;
else
services = 0;
totalSG = clothing + furnishHousehold + otherGoods + services;
Date currentTime = Calendar.getInstance().getTime();
double[] currentData = new double[26];
currentData[0] = currentTime.getMonth();
currentData[1] = currentTime.getDate();
currentData[2] = currentTime.getYear();
currentData[3] = electricity;
currentData[4] = naturalGas;
currentData[5] = fuelOil;
currentData[6] = propane;
currentData[7] = electricity;
currentData[8] = vehicle1;
currentData[9] = vehicle2;
currentData[10] = vehicle3;
currentData[11] = publicTransport;
currentData[12] = airTravel;
currentData[13] = totalFood;
currentData[14] = meatFishEggs;
currentData[15] =cerealBakery;
currentData[16] = dairy;
currentData[17] = fruitVegetable;
currentData[18] = eatingOut;
currentData[19] = otherFoods;
currentData[20] = totalSG;
currentData[21] = clothing;
currentData[22] = furnishHousehold;
currentData[23] = otherGoods;
currentData[24] = services;
total = 0;
for(int i = 3; i < 25; i++)
total = total + currentData[i];
currentData[25] = (total/2000);
这是我的日志：
08-31 18:51:25.778 17735-17735/com.example.alexlevine.oceanapp
E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.alexlevine.oceanapp, PID: 17735
java.lang.IllegalStateException: Could not execute method for
android:onClick
at
android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener
.onClick(AppCompatViewInflater.java:293)
at android.view.View.performClick(View.java:6219)
at android.view.View$PerformClick.run(View.java:24482)
at android.os.Handler.handleCallback(Handler.java:769)
at android.os.Handler.dispatchMessage(Handler.java:98)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6540)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invoke(Native Method)
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener
.onClick(AppCompatViewInflater.java:288)
at android.view.View.performClick(View.java:6219)
at android.view.View$PerformClick.run(View.java:24482)
at android.os.Handler.handleCallback(Handler.java:769)
at android.os.Handler.dispatchMessage(Handler.java:98)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6540)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
Caused by: java.lang.NumberFormatException: For input string: ""
at java.lang.Integer.parseInt(Integer.java:620)
at java.lang.Integer.parseInt(Integer.java:643)
at com.example.alexlevine.oceanapp.CarbonCalcActivity.onBtnClicked(CarbonCalcActivity.java:115)
at java.lang.reflect.Method.invoke(Native Method)
at android.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:288)
at android.view.View.performClick(View.java:6219)
at android.view.View$PerformClick.run(View.java:24482)
at android.os.Handler.handleCallback(Handler.java:769)
at android.os.Handler.dispatchMessage(Handler.java:98)
at android.os.Looper.loop(Looper.java:164)
at android.app.ActivityThread.main(ActivityThread.java:6540)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
我不确定造成这种情况的确切原因，特别是因为我已经完成了所有 null 检查。有人可以帮助解决错误吗？谢谢！ elecunit = (EditText) findViewById(R.id.kwh); elecbill = (EditText) findViewById(R.id.elec);
String elecunitString = elecunit.getText().toString();
String elecbillString = elecbill.getText().toString();
if(elecunitString != "" && elecbillString != "")
electricity = (Integer.parseInt(elecbill.getText().toString())/Integer.parseInt(elecunit.getText().toString()))*1.37*12;
else
electricity = 0;
【问题讨论】：
对从 EditText 捕获的 String 在 Parse 到 Integer 之前应用适当的验证，在您的情况下，字符串可能为空。 【参考方案1】：我注意到的是，您正在检查 null 的是 EditText 本身，而不是 EditText 的值。您正在这样做......
EditText editText = (EditText) findViewById(R.id.edittext);
if(editText != null)
value = Double.parseDouble(editText.getText().toString());
else
value = 0;
所以检查edittext的值的正确方法..这样做
EditText editText = (EditText) findViewById(R.id.edittext);
String etString = editText.getText().toString();
if(etString.equals(""))
value = Double.parseDouble(etString);
else
value = 0;
还要检查字符串是否可以转换，因为也许你正在转换一个字母，你会得到一个 NumberFormatException 所以你可以做这样的事情
private double parseStringToDouble(String sVal)
if(!sVal.equals(""))
try
return Double.parseDouble(sVal);
catch(Exception e)
//will handle the exception
return 0;
else return 0;
并从您的编辑文本中获取价值
EditText et1 = (EditText) findViewById(R.id.et1);
value1 = parseStringToDouble(et1.getText().toString());
EditText et2 = (EditText) findViewById(R.id.et2);
value2 = parseStringToDouble(et2.getText().toString());
【讨论】：
我在您最初的建议中添加了内容，并将 EditText 更改为在获取输入时仅显示数字键盘，因此无法输入字母。但是，我仍然遇到同样的错误。我将新代码添加到原始问题中。 是 IllegalStateException 吗？我可以看看你的 xml 吗？ 请再次检查..这就是你在做什么.. if(elecunitString != "" && elecbillString != "") 因为你正在检查一个字符串..你应该使用 if(elecunitString .equals("") && elecbillString.equals(""))以上是关于从 EditText 获取数据输入时，导致应用程序崩溃 Android 的 NumberFormat 错误的主要内容，如果未能解决你的问题，请参考以下文章