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嗨，亲爱的，我在这里发布我的整个班级，我遇到问题。首先我解释我的问题。我正在使用spinners生成一个arrayList“Items”，并且spinners和arrays中的元素完全相同然后在比较数组长度和ArayList大小之后，我想跳到下一个活动，但是现在比较数组时会出现问题，请帮我解决这个问题 在这里感谢我的活动引起：java.lang.ArrayIndexOutOfBoundsException：length = 8; index = 8
package com.example.mine4.pantryrecipes;
import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import java.util.List;
import java.util.ArrayList;
import android.view.View;
import android.widget.Toast;
import android.widget.Button;
import android.widget.TextView;
public class AddItem extends Activity {
MultiSelectionSpinner spinner1,spinner2,spinner3,spinner4;
Button button1;
TextView tv;
private int count = 0;
List<String> Items=new ArrayList<>();
List<String> veg=new ArrayList<>();
List<String> spice=new ArrayList<>();
List<String> dairy=new ArrayList<>();
ArrayList<Boolean> subset = new ArrayList<>();
String[] arrayRecipe = { "chicken","vegetable oil","ginger",
"onion", "garlic","potatoes","tomatoes","roasted peanuts", "peanut butter"};
String[] arrayRecipe2 = { "chicken","garlic","vegetable oil", "tomatoes",
"Dijon mustard","breadcrumbs","Parmesan cheese","unsalted butter"};
String[] arrayRecipe3 = { "chicken", "vegetable oil","unsalted butter",
"sugar", "garlic", "sauce"};
@Override
protected void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_add_item);
button1=(Button)findViewById(R.id.button1);
tv=(TextView)findViewById(R.id.tv);
String[] arrayItems = {"chicken"};
String[] arrayVeg = { "vegetable oil", "ginger",
"garlic","potatoes" ,"tomatoes","onion"};
String[] arraySpice = { "roasted peanuts", "sauce","Dijon mustard" };
String[] arrayDairy = { "breadcrumbs", "Parmesan cheese", "unsalted butter","sugar", "peanut butter" };
spinner1 = (MultiSelectionSpinner) findViewById(R.id.mySpinner1);
spinner2 = (MultiSelectionSpinner) findViewById(R.id.mySpinner2);
spinner3 = (MultiSelectionSpinner) findViewById(R.id.mySpinner3);
spinner4= (MultiSelectionSpinner) findViewById(R.id.mySpinner4);
spinner1.setItems(arrayItems);
spinner2.setItems(arrayVeg);
spinner3.setItems(arraySpice);
spinner4.setItems(arrayDairy);
}
public void onClick(View v)
{
Items=spinner1.getSelectedStrings();
veg=spinner2.getSelectedStrings();
spice=spinner3.getSelectedStrings();
dairy=spinner4.getSelectedStrings();
Items.addAll(veg);
Items.addAll(spice);
Items.addAll(dairy);
// for(int i=0;i<Items.size();i++)
// tv.append(Items.get(i));
compareArray();
//count++;
}
public void compareArray()
{
for(int j = 0 ; j < arrayRecipe.length ; j++)
{
for(int i = 0 ; i <Items.size() ; i++)
{
if((arrayRecipe[i].equals(Items.get(j))))
{
subset.add(true);
break;
}
if ((arrayRecipe2[i].equals(Items.get(j))))
{
subset.add(true);
break;
}
if ((arrayRecipe3[i].equals(Items.get(j))))
{
subset.add(true);
break;
}
}
}
if(subset != null) {
if ((arrayRecipe.length == subset.size())) {
Intent nextClass = new Intent();
nextClass.setClass(AddItem.this, TenIngreRec.class);
startActivity(nextClass);
finish();
Toast.makeText(getApplicationContext(), "arrayRecipe", Toast.LENGTH_LONG).show();
}
if ((arrayRecipe2.length == subset.size())) {
Intent nextClass = new Intent();
nextClass.setClass(AddItem.this, EightIngreRec.class);
startActivity(nextClass);
finish();
Toast.makeText(getApplicationContext(), "arrayRecipe2", Toast.LENGTH_LONG).show();
}
if ((arrayRecipe3.length == subset.size())) {
Intent nextClass = new Intent();
nextClass.setClass(AddItem.this, EightIngreRec.class);
startActivity(nextClass);
finish();
Toast.makeText(getApplicationContext(), "arrayRecipe3", Toast.LENGTH_LONG).show();
}
else {
Toast.makeText(getApplicationContext(), "Un-Matched", Toast.LENGTH_LONG).show();
}
}
}
@Override
public void onBackPressed()
{
// code here to show dialog
super.onBackPressed(); // optional depending on your needs
Intent intn = new Intent(AddItem.this,Exmain.class);
startActivity(intn);
}
}，并在此代码是阵列发生的主要问题indexOutOfBound
for(int j = 0 ; j < arrayRecipe.length ; j++)
{
for(int i = 0 ; i <Items.size() ; i++)
{
if((arrayRecipe[i].equals(Items.get(j))))
{
subset.add(true);
break;
}
if ((arrayRecipe2[i].equals(Items.get(j))))
{
subset.add(true);
break;
}
if ((arrayRecipe3[i].equals(Items.get(j))))
{
subset.add(true);
break;
}
}
}再次感谢帮助我
我认为你倒i和j指数...使用j arrayRecipe和我的项目 –