如何纠正“java.lang.IllegalStateException:无法为安卓执行方法：onClick”？
logcat中的错误包括：-
2019-02-26 17:19:49.253 31623-31623/? E/Zygote: isWhitelistProcess - Process is Whitelisted
2019-02-26 17:20:20.717 31623-31623/com.ms.myapplication E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.mohitsharma.myapplication, PID: 31623
java.lang.IllegalStateException: Could not execute method for 安卓:onClick
at 安卓.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:389)
at 安卓.view.View.performClick(View.java:6897)
at 安卓.widget.TextView.performClick(TextView.java:12693)
at 安卓.view.View$PerformClick.run(View.java:26101)
at 安卓.os.Handler.handleCallback(Handler.java:789)
at 安卓.os.Handler.dispatchMessage(Handler.java:98)
at 安卓.os.Looper.loop(Looper.java:164)
at 安卓.app.ActivityThread.main(ActivityThread.java:6944)
at java.lang.reflect.Method.invoke(Native Method)
at com.安卓.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327)
at com.安卓.internal.os.ZygoteInit.main(ZygoteInit.java:1374)
Caused by: java.lang.reflect.InvocationTargetException
at java.lang.reflect.Method.invoke(Native Method)
at 安卓.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:384)
at 安卓.view.View.performClick(View.java:6897)
at 安卓.widget.TextView.performClick(TextView.java:12693)
at 安卓.view.View$PerformClick.run(View.java:26101)
at 安卓.os.Handler.handleCallback(Handler.java:789)
at 安卓.os.Handler.dispatchMessage(Handler.java:98)
at 安卓.os.Looper.loop(Looper.java:164)
at 安卓.app.ActivityThread.main(ActivityThread.java:6944)
at java.lang.reflect.Method.invoke(Native Method)
at com.安卓.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327)
at com.安卓.internal.os.ZygoteInit.main(ZygoteInit.java:1374)
Caused by: java.lang.ArrayIndexOutOfBoundsException: length=7; index=7
at jxl.read.biff.SheetImpl.getCell(SheetImpl.java:318)
at com.mohitsharma.myapplication.MainActivity.onButtonClick1(MainActivity.java:62)
at java.lang.reflect.Method.invoke(Native Method)
at 安卓.support.v7.app.AppCompatViewInflater$DeclaredOnClickListener.onClick(AppCompatViewInflater.java:384)
at 安卓.view.View.performClick(View.java:6897)
at 安卓.widget.TextView.performClick(TextView.java:12693)
at 安卓.view.View$PerformClick.run(View.java:26101)
at 安卓.os.Handler.handleCallback(Handler.java:789)
at 安卓.os.Handler.dispatchMessage(Handler.java:98)
at 安卓.os.Looper.loop(Looper.java:164)
at 安卓.app.ActivityThread.main(ActivityThread.java:6944)
at java.lang.reflect.Method.invoke(Native Method)
at com.安卓.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:327)
at com.安卓.internal.os.ZygoteInit.main(ZygoteInit.java:1374)
我的代码是：-
package com.mohitsharma.myapplication;
import 安卓.content.res.AssetManager;
import 安卓.support.v7.app.AppCompatActivity;
import 安卓.os.Bundle;
import 安卓.view.View;
import 安卓.widget.EditText;
import 安卓.widget.TextView;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;
import jxl.Cell;
import jxl.Sheet;
import jxl.Workbook;
import jxl.read.biff.BiffException;
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
public void onButtonClick(View v)
{
EditText e1=(EditText)findViewById(R.id.editText); // volume of the part
EditText e2=(EditText)findViewById(R.id.editText2); //Cost of the part
EditText e3=(EditText)findViewById(R.id.editText3); //Lead time
EditText e4=(EditText)findViewById(R.id.editText4); //Tolerance
EditText e5=(EditText)findViewById(R.id.editText5); //Number of parts
EditText e6=(EditText)findViewById(R.id.editText6);
TextView t1=(TextView)findViewById(R.id.textView);
double volume=Double.parseDouble(e1.getText().toString());
double conventional_cost=Double.parseDouble(e2.getText().toString());
double lead_time=Double.parseDouble(e3.getText().toString());
double tolerance=Double.parseDouble(e4.getText().toString());
double num_parts=Double.parseDouble(e5.getText().toString());
String material=e6.getText().toString();
AssetManager am=getAssets();
Workbook wb =null;
try (InputStream is = am.open("Printer Specification.xls")) {
wb = Workbook.getWorkbook(is);
} catch (IOException e) {
e.printStackTrace();
} catch (BiffException e) {
e.printStackTrace();
}
assert wb != null;
Sheet s=wb.getSheet(0);
int row=s.getRows();
int[] x=new int[2];
List<Integer> possible_printers = new ArrayList<>();
List<Integer> possible_printers_2 = new ArrayList<>();
List<Integer> possible_printers_3 = new ArrayList<>();
int count=0;
for(int i=1;i<row;i++)
{
count=0;
Cell c=s.getCell(i,1); //Checking for print volume vs part volume
String st=c.getContents();
int length=st.length();
for(int j=0;j<length;j++)
{
if(st.charAt(j)=='x')
{
x[count]=j; // Finding the location of x in volume of the printer
count++;
}
}
if(x[1]!=0)
{
double l= Double.parseDouble(st.substring(0,x[0]-1));
double b= Double.parseDouble(st.substring(x[0]+2,x[1]-1)); //Checking for the cartesian printers volume
double h=Double.parseDouble(st.substring(x[1]+2));
double vol=l*b*h;
if(vol>=volume)
{
possible_printers.add(i);
}
}
else
{
double d=Double.parseDouble(st.substring(0,x[0]-2));
double h=Double.parseDouble(st.substring(x[0]+2,length-1)); // Checking for the volume of the delta printer
double vol=Math.PI*Math.pow(d,2)*h;
if (vol>=volume)
{
possible_printers.add(i);
}
}
}
int[] y=new int[2];
count=0;
if (possible_printers.size()>0) // Checking for the build rate
{
for(int i=0;i<possible_printers.size();i++)
{
Cell c=s.getCell(possible_printers.get(i),4);
String st=c.getContents();
if(!st.equals(""))
{
for(int j=0;j<st.length();j++)
{
if (st.charAt(j)=='c')
{
y[count]=j; //Finding the location of cm3/hr in build rate
//count++;
}
}
double build_rate=Double.parseDouble(st.substring(0,y[0]-1));
double print_time=(volume/1000)/build_rate;
if (lead_time>=print_time) // Comparing the printing time vs the lead time
{
possible_printers_2.add(possible_printers.get(i));
}
}
//count=0;
}
}
else
{
String print="The part cannot be 3D printed as the part volume is too big";
t1.setText(print);
return; // Display that there are no suitable printers to print your part due to build volume
}
if (possible_printers_2.size()>0) // Check for whether the required tolerance is achieved using printing
{
for(int i=0;i<possible_printers_2.size();i++)
{
Cell c=s.getCell(possible_printers_2.get(i),3);
String st=c.getContents();
double tol=Double.parseDouble(st);
if (tol<=tolerance)
{
possible_printers_3.add(possible_printers_2.get(i));
}
}
}
else
{
String print="The part cannot be 3D printed as printing time is too big";
t1.setText(print);
return; //Display that the given part is not printable due to time issues
}
if(possible_printers_3.size()==0)
{
String print="The part cannot be 3D printed as the required tolerance cannot be achieved";
t1.setText(print);
return; //Display that the part is not printable as the possible tolerance cannot be achieved by printing
}
// COST OF PRINTING
double cost=0;
Workbook wb2 = null;
try (InputStream is2 = am.open("Cost of material.xls")) {
wb2 = Workbook.getWorkbook(is2);
} catch (IOException e) {
e.printStackTrace();
} catch (BiffException e) {
e.printStackTrace();
}
assert wb2 != null;
Sheet s2=wb2.getSheet(0);
int row2=s2.getRows();
Workbook wb3=null;
try (InputStream is3 = am.open("Material densities.xls")) {
wb3 = Workbook.getWorkbook(is3);
} catch (IOException e) {
e.printStackTrace();
} catch (BiffException e) {
e.printStackTrace();
}
assert wb3 != null;
Sheet s3=wb3.getSheet(0);
int row3=s3.getRows();
double density=0;
for(int i=0;i<row3;i++)
{
Cell c=s3.getCell(i,0);
String mat=c.getContents();
if(mat.equalsIgnoreCase(material))
{
Cell c2=s3.getCell(i,1);
density=Double.parseDouble(c2.getContents());
break;
}
}
for(int i=1;i<row2;i++)
{
Cell c=s2.getCell(i,0); //Getting the material name
String mat=c.getContents();
if(mat.equalsIgnoreCase(material))
{
Cell c2=s2.getCell(i,1); //Getting the filament diameter
double dia=Double.parseDouble(c2.getContents());
if(dia==3)
{
Cell c3=s2.getCell(i,2);
cost=(volume*density/Math.pow(10,9))*Double.parseDouble(c3.getContents())*70.99*num_parts;
}
}
}
if(cost<=conventional_cost)
{
String print="The part is 3D printable as the printing cost "+cost+" is less than conventional cost "+conventional_cost;
t1.setText(print);//Display that the part is printable as cost of printing is suitable
}
else
{
String print="The part is not 3D printable as the printing cost "+cost+" is more than conventional cost "+conventional_cost;
t1.setText(print);
return;// Display that part is not printable due to cost issues
}
for(int i=0;i<possible_printers_3.size();i++)
{
Cell c=s.getCell(possible_printers_3.get(i),0);
String printer=c.getContents();
printer=printer+"\n";
t1.setText(printer);
}
}
}
代码和错误信息可以在上面看到。代码将用户输入的一些数据与应用程序代码中资产文件夹中的excel文件中的数据进行比较。jxl用于读取和写入此代码中的文件
# 1 楼答案
您在活动的第62行收到
ArrayIndexOutOfBoundsException。第62行是这一行：Cell c=s.getCell(i,1); //Checking for print volume vs part volume在这行设置Breakpooint并调试应用程序。您希望访问阵列中的位置7，但其长度仅为7
也许你的
int row=s.getRows();应该是int row=s.getRows() - 1;（第53行）