Java 有没有一种方法可以包含i+；1在广播类函数内的for循环中？

我试图循环遍历包含数字的字符串数组，并将这些值解析为整数集合，将返回值显示在广播中，例如“a work from---，returned value”

我已使用

.split（'，'）

将字符串拆分为一个字符串数组，并在将字符串值解析为整数时尝试循环遍历该数组。 如果我可以直接输入索引

parseInt（FilterDataValues[1]）

或任何索引，我可以从for循环中获取返回值，但是一旦我添加I

parseInt（FilterDataValues[I+1]）

或

parseInt（FilterDataValues[I]）

我就无法获取返回值。这个循环在一个更简单的循环中运行良好，所以我不太确定发生了什么。请帮助我，任何帮助都可以

 public String sortingList(Context context)
    {
        String filterData = "";
        StimulusDatabase td = new StimulusDatabase(context);

        Cursor result = td.getAllData();
        while (result.moveToNext())
        {
            filterData = (result.getString(23));
        }

        if(filterData.isEmpty())
        {
            return "";
        }
        else
        {
            String[] FilterDataValues = filterData.split(",");

            for(int i = 0; i <= FilterDataValues.length; i++)
            {
                FilterOptions.add(parseInt(FilterDataValues[i+1]));
            }

//            for(int i = 0; i <= FilterDataValues.length; i++)
//            {
//                FilterOptions.add(i+1));
//            }

            return filterData;
        }
    }

全班同学都在下面

package com.example.MentalHealthStateManagement.Application.Notifications;

import android.app.Notification;
import android.app.PendingIntent;
import android.app.TaskStackBuilder;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.os.Build;
import android.util.Log;

import com.example.MentalHealthStateManagement.Application.Database.StimulusDatabase;
import com.example.MentalHealthStateManagement.R;
import com.example.MentalHealthStateManagement.StateHandler.CheckIn;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ThreadLocalRandom;

import androidx.core.app.NotificationManagerCompat;

import static java.lang.Integer.parseInt;

public class Trigger_Receiver extends BroadcastReceiver
{
    private static final String CHANNEL_ID = "M.H.S.M daily check-in registry";
    private static final String TAG = "Trigger Receiver: ";

    private String[] authors;
    private String sortStatement;
    private List<Integer> FilterOptions = new ArrayList<>();
    private int notificationID = 135;

    @Override
    public void onReceive(Context context, Intent intent)
    {
        sortStatement = sortingList(context);
        authors = getAuthors(context).split("#");
        String[] quotes = getQuotes(context).split("#");

        int randomNum = randomPosition();

        // Create an exclusive intent for the user's daily check-in
        intent = new Intent(context, CheckIn.class);

        // Create the TaskStack Builder and add the Main Activity, which inflates the back stack
        TaskStackBuilder stackBuilder = TaskStackBuilder.create(context);
        stackBuilder.addNextIntentWithParentStack(intent);
        PendingIntent pendingIntent = stackBuilder.getPendingIntent(0, PendingIntent.FLAG_UPDATE_CURRENT);

        // Checks if the API Level is 26 or greater
        Notification.Builder notification = null;
        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
            notification = new Notification.Builder(context, CHANNEL_ID)
                    .setSmallIcon(R.drawable.common_google_signin_btn_icon_dark)
                    .setContentTitle("A word from " + authors[randomNum])
                    .setContentText(sortingList(context))//quotes[randomNum]
                    .setStyle(new Notification.BigTextStyle().bigText(sortingList(context)))
                    .setContentIntent(pendingIntent)
                    .setAutoCancel(true);
        }

        NotificationManagerCompat notificationManger = NotificationManagerCompat.from(context);
        assert notification != null;
        notificationManger.notify(notificationID, notification.build());
        notificationID++;
        Log.i("Trigger_Receiver", "Trigger successful");
    }

    //Gets the authors for the specified trigger
    public String getAuthors(Context context)
    {
        StringBuilder authors = new StringBuilder();
        StimulusDatabase td = new StimulusDatabase(context);
       // List<Integer> AuthorsToBeFiltered = NumberFilterValue;

        Cursor result = td.getAllData();

            while (result.moveToNext())
            {
                authors = new StringBuilder(result.getString(2) + " " + result.getString(4) + " "
                        + result.getString(6) + " " + result.getString(8) + " " +
                            result.getString(10) + " " + result.getString(12) + " "
                        + result.getString(14) + " " + result.getString(16) + " " +
                            result.getString(18) + " " + result.getString(20));
            }

//            while (result.moveToNext())
//            {
//                if(!AuthorsToBeFiltered.isEmpty())
//                {
//                    for(int i = 0; i<AuthorsToBeFiltered.size(); i++)
//                    {
//                        if(AuthorsToBeFiltered.get(i) % 2 == 0)
//                        {
//                            authors.append(result.getString(i));
//                        }
//                    }
//                }
//                else
//                {
//                    authors = new StringBuilder(result.getString(2) + " " + result.getString(4) + " " + result.getString(6) + " " + result.getString(8) + " " +
//                            result.getString(10) + " " + result.getString(12) + " " + result.getString(14) + " " + result.getString(16) + " " +
//                            result.getString(18) + " " + result.getString(20));
//                }
//            }

        return authors.toString();
    }

    //Gets the quotes for the specified trigger
    public String getQuotes(Context context)
    {
        StringBuilder quotes = new StringBuilder();
        StimulusDatabase td = new StimulusDatabase(context);
        //List<Integer> AuthorsToBeFiltered = NumberFilterValue;

        Cursor result = td.getAllData();

                while (result.moveToNext())
                {
                    quotes.append(result.getString(1)).append(" ").append(result.getString(3))
                            .append(" ").append(result.getString(5)).append(" ").append(result.getString(7))
                            .append(" ").append(result.getString(9)).append(" ").append(result.getString(11))
                            .append(" ").append(result.getString(13)).append(" ").append(result.getString(15))
                            .append(" ").append(result.getString(17)).append(" ").append(result.getString(19));
                }

//            while (result.moveToNext())
//            {
//                if(!AuthorsToBeFiltered.isEmpty())
//                {
//                    for(int i = 0; i<AuthorsToBeFiltered.size(); i++)
//                    {
//                        if(AuthorsToBeFiltered.get(i) % 2 == 0)
//                        {
//                            quotes.append(result.getString(i-1));
//                        }
//                    }
//                }
//                else
//                {
//                    quotes.append(result.getString(1)).append(" ").append(result.getString(3))
//                            .append(" ").append(result.getString(5)).append(" ").append(result.getString(7))
//                            .append(" ").append(result.getString(9)).append(" ").append(result.getString(11))
//                            .append(" ").append(result.getString(13)).append(" ").append(result.getString(15))
//                            .append(" ").append(result.getString(17)).append(" ").append(result.getString(19));
//                }
//            }

        return quotes.toString();
    }

    //A random number used to gather different quotes and authors
    //P.S. each quote belongs to appropriate author due to the delimiter settings preformed in the StimulusSetup class
    public Integer randomPosition()
    {
        int randomNum = 0;
        // Ensures the API level 26 or greater
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP)
        {
            randomNum = ThreadLocalRandom.current().nextInt(0, authors.length + 1);
        }
        else
        {
            Log.d(TAG,"Incompatible device, API lower than lollipop");
        }
        return randomNum;
    }

    public String sortingList(Context context)
    {
        String filterData = "";
        StimulusDatabase td = new StimulusDatabase(context);

        Cursor result = td.getAllData();
        while (result.moveToNext())
        {
            filterData = (result.getString(23));
        }

        if(filterData.isEmpty())
        {
            return "";
        }
        else
        {
            String[] FilterDataValues = filterData.split(",");

            for(int i = 0; i <= FilterDataValues.length; i++)
            {
                FilterOptions.add(parseInt(FilterDataValues[i+1]));
            }

//  `         Working loop
//            for(int i = 0; i <= FilterDataValues.length; i++)
//            {
//                FilterOptions.add(i+1));
//            }

            return filterData;
        }
    }
}

package com.example.MentalHealthStateManagement.Application.Notifications；
导入android.app.Notification；
导入android.app.pendingent；
导入android.app.TaskStackBuilder；
导入android.content.BroadcastReceiver；
导入android.content.Context；
导入android.content.Intent；
导入android.database.Cursor；
导入android.os.Build；
导入android.util.Log；
导入com.example.MentalHealthStateManagement.Application.Database.StimulusDatabase；
导入com.example.MentalHealthStateManagement.R；
导入com.example.MentalHealthStateManagement.StateHandler.CheckIn；
导入java.util.ArrayList；
导入java.util.List；
导入java.util.concurrent.ThreadLocalRandom；
导入androidx.core.app.NotificationManagerCompat；
导入静态java.lang.Integer.parseInt；
公共类触发器接收器扩展广播接收器
{
专用静态最终字符串通道\u ID=“M.H.S.M每日值机登记”；
私有静态最终字符串标记=“触发器接收器：”；
私有字符串[]作者；
私有字符串排序语句；
私有列表筛选器选项=新的ArrayList（）；
私有int notificationID=135；
@凌驾
公共void onReceive（上下文、意图）
{
sortStatement=排序列表（上下文）；
authors=getAuthors（context）.split（“#”）；
String[]quotes=getQuotes（context.split（“#”）；
int randomNum=randomPosition（）；
//为用户的每日入住创建专属目的
intent=新的intent（上下文，CheckIn.class）；
//创建TaskStack Builder并添加主活动，这会使后堆栈膨胀
TaskStackBuilder stackBuilder=TaskStackBuilder.create（上下文）；
stackBuilder.AddNextEntWithParentStack（意图）；
PendingEvent PendingEvent=stackBuilder.GetPendingEvent（0，PendingEvent.FLAG_UPDATE_CURRENT）；
//检查API级别是否为26或更高
Notification.Builder Notification=null；
if（android.os.Build.VERSION.SDK\u INT>=android.os.Build.VERSION\u code.O）{
通知=新建通知.Builder（上下文，通道ID）
.setSmallIcon（R.drawable.common_google_signin_btn_icon_dark）
.setContentTitle（“来自”+作者[randomNum]的单词）
.setContentText（排序列表（上下文））//引号[randomNum]
.setStyle（新通知.BigTextStyle（）.bigText（排序列表（上下文）））
.setContentIntent（挂起内容）
.setAutoCancel（真）；
}
NotificationManagerCompat NotificationManager=NotificationManagerCompat.from（上下文）；
断言通知！=null；
notificationmanager.notify（notificationID，notification.build（））；
notificationID++；
Log.i（“触发接收器”，“触发成功”）；
}
//获取指定触发器的作者
公共字符串getAuthors（上下文）
{
StringBuilder authors=新建StringBuilder（）；
StimulusDatabase td=新的StimulusDatabase（上下文）；
//列表作者ToBefilted=NumberFilterValue；
游标结果=td.getAllData（）；
while（result.moveToNext（））
{
authors=新建StringBuilder（result.getString（2）+“”+result.getString（4）+“”
+result.getString（6）+“”+result.getString（8）+“”+
result.getString（10）+“result.getString（12）+”
+result.getString（14）+“”+result.getString（16）+“”+
result.getString（18）+“”+result.getString（20））；
}
//while（result.moveToNext（））
//            {
//如果（！AuthorsToBeFiltered.isEmpty（））
//                {
//对于（inti=0；i注意，在循环中，您正在调用

FilterOptions.add（parseInt（FilterDataValues[i+1]）；

在循环的最后一次迭代中应该失败，因为将尝试从该数组中不存在的位置读取值。我猜您可以在LogCat中找到
IndexOutOfBoundException

这可能是您无法获取返回值的原因，因为方法应该抛出异常。
注意，在循环中，您正在调用

FilterOptions.add（parseInt（FilterDataValues[i+1]）；

在循环的最后一次迭代中应该失败，因为将尝试从该数组中不存在的位置读取值。我猜您可以在LogCat中找到
IndexOutOfBoundException

这可能是您无法获得返回值的原因，因为方法应该抛出异常。
我理解为什么我会获得
IndexOutOfBoundException
，因为即使是最后一个索引，我也会尝试执行上面的步骤，但如果没有
I+1
，仅使用索引
I
，则不会显示返回值。这就是这是我当前的问题如果在OP中没有说明，我道歉我理解为什么我会得到一个
IndexOutOfBoundException
，因为我最终会在索引中
package com.example.MentalHealthStateManagement.Application.Notifications;

import android.app.Notification;
import android.app.PendingIntent;
import android.app.TaskStackBuilder;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.os.Build;
import android.util.Log;

import com.example.MentalHealthStateManagement.Application.Database.StimulusDatabase;
import com.example.MentalHealthStateManagement.R;
import com.example.MentalHealthStateManagement.StateHandler.CheckIn;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ThreadLocalRandom;

import androidx.core.app.NotificationManagerCompat;

import static java.lang.Integer.parseInt;

public class Trigger_Receiver extends BroadcastReceiver
{
    private static final String CHANNEL_ID = "M.H.S.M daily check-in registry";
    private static final String TAG = "Trigger Receiver: ";

    private String[] authors;
    private String sortStatement;
    private List<Integer> FilterOptions = new ArrayList<>();
    private int notificationID = 135;

    @Override
    public void onReceive(Context context, Intent intent)
    {
        sortStatement = sortingList(context);
        authors = getAuthors(context).split("#");
        String[] quotes = getQuotes(context).split("#");

        int randomNum = randomPosition();

        // Create an exclusive intent for the user's daily check-in
        intent = new Intent(context, CheckIn.class);

        // Create the TaskStack Builder and add the Main Activity, which inflates the back stack
        TaskStackBuilder stackBuilder = TaskStackBuilder.create(context);
        stackBuilder.addNextIntentWithParentStack(intent);
        PendingIntent pendingIntent = stackBuilder.getPendingIntent(0, PendingIntent.FLAG_UPDATE_CURRENT);

        // Checks if the API Level is 26 or greater
        Notification.Builder notification = null;
        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
            notification = new Notification.Builder(context, CHANNEL_ID)
                    .setSmallIcon(R.drawable.common_google_signin_btn_icon_dark)
                    .setContentTitle("A word from " + authors[randomNum])
                    .setContentText(sortingList(context))//quotes[randomNum]
                    .setStyle(new Notification.BigTextStyle().bigText(sortingList(context)))
                    .setContentIntent(pendingIntent)
                    .setAutoCancel(true);
        }

        NotificationManagerCompat notificationManger = NotificationManagerCompat.from(context);
        assert notification != null;
        notificationManger.notify(notificationID, notification.build());
        notificationID++;
        Log.i("Trigger_Receiver", "Trigger successful");
    }

    //Gets the authors for the specified trigger
    public String getAuthors(Context context)
    {
        StringBuilder authors = new StringBuilder();
        StimulusDatabase td = new StimulusDatabase(context);
       // List<Integer> AuthorsToBeFiltered = NumberFilterValue;

        Cursor result = td.getAllData();

            while (result.moveToNext())
            {
                authors = new StringBuilder(result.getString(2) + " " + result.getString(4) + " "
                        + result.getString(6) + " " + result.getString(8) + " " +
                            result.getString(10) + " " + result.getString(12) + " "
                        + result.getString(14) + " " + result.getString(16) + " " +
                            result.getString(18) + " " + result.getString(20));
            }

//            while (result.moveToNext())
//            {
//                if(!AuthorsToBeFiltered.isEmpty())
//                {
//                    for(int i = 0; i<AuthorsToBeFiltered.size(); i++)
//                    {
//                        if(AuthorsToBeFiltered.get(i) % 2 == 0)
//                        {
//                            authors.append(result.getString(i));
//                        }
//                    }
//                }
//                else
//                {
//                    authors = new StringBuilder(result.getString(2) + " " + result.getString(4) + " " + result.getString(6) + " " + result.getString(8) + " " +
//                            result.getString(10) + " " + result.getString(12) + " " + result.getString(14) + " " + result.getString(16) + " " +
//                            result.getString(18) + " " + result.getString(20));
//                }
//            }

        return authors.toString();
    }

    //Gets the quotes for the specified trigger
    public String getQuotes(Context context)
    {
        StringBuilder quotes = new StringBuilder();
        StimulusDatabase td = new StimulusDatabase(context);
        //List<Integer> AuthorsToBeFiltered = NumberFilterValue;

        Cursor result = td.getAllData();

                while (result.moveToNext())
                {
                    quotes.append(result.getString(1)).append(" ").append(result.getString(3))
                            .append(" ").append(result.getString(5)).append(" ").append(result.getString(7))
                            .append(" ").append(result.getString(9)).append(" ").append(result.getString(11))
                            .append(" ").append(result.getString(13)).append(" ").append(result.getString(15))
                            .append(" ").append(result.getString(17)).append(" ").append(result.getString(19));
                }

//            while (result.moveToNext())
//            {
//                if(!AuthorsToBeFiltered.isEmpty())
//                {
//                    for(int i = 0; i<AuthorsToBeFiltered.size(); i++)
//                    {
//                        if(AuthorsToBeFiltered.get(i) % 2 == 0)
//                        {
//                            quotes.append(result.getString(i-1));
//                        }
//                    }
//                }
//                else
//                {
//                    quotes.append(result.getString(1)).append(" ").append(result.getString(3))
//                            .append(" ").append(result.getString(5)).append(" ").append(result.getString(7))
//                            .append(" ").append(result.getString(9)).append(" ").append(result.getString(11))
//                            .append(" ").append(result.getString(13)).append(" ").append(result.getString(15))
//                            .append(" ").append(result.getString(17)).append(" ").append(result.getString(19));
//                }
//            }

        return quotes.toString();
    }

    //A random number used to gather different quotes and authors
    //P.S. each quote belongs to appropriate author due to the delimiter settings preformed in the StimulusSetup class
    public Integer randomPosition()
    {
        int randomNum = 0;
        // Ensures the API level 26 or greater
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP)
        {
            randomNum = ThreadLocalRandom.current().nextInt(0, authors.length + 1);
        }
        else
        {
            Log.d(TAG,"Incompatible device, API lower than lollipop");
        }
        return randomNum;
    }

    public String sortingList(Context context)
    {
        String filterData = "";
        StimulusDatabase td = new StimulusDatabase(context);

        Cursor result = td.getAllData();
        while (result.moveToNext())
        {
            filterData = (result.getString(23));
        }

        if(filterData.isEmpty())
        {
            return "";
        }
        else
        {
            String[] FilterDataValues = filterData.split(",");

            for(int i = 0; i <= FilterDataValues.length; i++)
            {
                FilterOptions.add(parseInt(FilterDataValues[i+1]));
            }

//  `         Working loop
//            for(int i = 0; i <= FilterDataValues.length; i++)
//            {
//                FilterOptions.add(i+1));
//            }

            return filterData;
        }
    }
}