stacktrace E/UncaughtException:java.lang.IndexOutOfBoundsException:索引1无效

我正在开发一款带有firebase排行榜的android应用程序，它运行良好，但当我点击排行榜时崩溃， 这是堆栈跟踪日志， 我得到2个错误：

E/UncaughtException:java.lang.IndexOutOfBoundsException:索引1无效，大小为1

E/AndroidRuntime:致命异常：主

12-02 01:05:53.969 3508-3508/com.example.myapp E/UncaughtException: java.lang.IndexOutOfBoundsException: Invalid index 1, size is 1
                                                                            at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:255)
                                                                            at java.util.ArrayList.get(ArrayList.java:308)
                                                                            at com.example.myapp.activity.LeaderboardActivity$4.onChildAdded(LeaderboardActivity.java:167)
                                                                            at com.google.android.gms.internal.zzaer.zza(Unknown Source)
                                                                            at com.google.android.gms.internal.zzagp.zzSu(Unknown Source)
                                                                            at com.google.android.gms.internal.zzags$1.run(Unknown Source)
                                                                            at android.os.Handler.handleCallback(Handler.java:739)
                                                                            at android.os.Handler.dispatchMessage(Handler.java:95)
                                                                            at android.os.Looper.loop(Looper.java:135)
                                                                            at android.app.ActivityThread.main(ActivityThread.java:5254)
                                                                            at java.lang.reflect.Method.invoke(Native Method)
                                                                            at java.lang.reflect.Method.invoke(Method.java:372)
                                                                            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
                                                                            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)
12-02 01:05:54.215 3508-3508/com.example.myapp E/AndroidRuntime: FATAL EXCEPTION: main
                                                                     Process: com.example.myapp, PID: 3508
                                                                     java.lang.IndexOutOfBoundsException: Invalid index 1, size is 1
                                                                         at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:255)
                                                                         at java.util.ArrayList.get(ArrayList.java:308)
                                                                         at com.examle.myapp.activity.LeaderboardActivity$4.onChildAdded(LeaderboardActivity.java:167)
                                                                         at com.google.android.gms.internal.zzaer.zza(Unknown Source)
                                                                         at com.google.android.gms.internal.zzagp.zzSu(Unknown Source)
                                                                         at com.google.android.gms.internal.zzags$1.run(Unknown Source)
                                                                         at android.os.Handler.handleCallback(Handler.java:739)
                                                                         at android.os.Handler.dispatchMessage(Handler.java:95)
                                                                         at android.os.Looper.loop(Looper.java:135)
                                                                         at android.app.ActivityThread.main(ActivityThread.java:5254)
                                                                         at java.lang.reflect.Method.invoke(Native Method)
                                                                         at java.lang.reflect.Method.invoke(Method.java:372)
                                                                         at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903)
                                                                         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)

两条蓝线都表示leaderboardactivity.java中这一行有错误

if (leaderboards.get(1).getName().equalsIgnoreCase(displayName)) {

private void getLeaderboard() {

        databaseLeaderboard.orderByChild("score").limitToLast((int) totalValue).addChildEventListener(new ChildEventListener() {
            @Override
            public void onChildAdded(DataSnapshot dataSnapshot, String prevChildKey) {
                Leaderboard leaderboard = dataSnapshot.getValue(Leaderboard.class);
                leaderboards.add(leaderboard);

                if (leaderboards.size() >= (int) totalValue) {
                    Collections.reverse(leaderboards);
                    leaderboardAdapterNew.notifyDataSetChanged();
                }

                if (leaderboards.size() == totalValue) {


                    if (leaderboards.get(0).getName().equalsIgnoreCase(displayName)) {
                        txtUname1.setText("Me");
                    } else {
                        txtUname1.setText(leaderboards.get(0).getName());
                    }
                    if (leaderboards.get(1).getName().equalsIgnoreCase(displayName)) {
                        txtUname2.setText("Me");
                    } else {
                        txtUname2.setText(leaderboards.get(1).getName());
                    }
                    if (leaderboards.get(2).getName().equalsIgnoreCase(displayName)) {
                        txtUname3.setText("Me");
                    } else {
                        txtUname3.setText(leaderboards.get(2).getName());
                    }

下面是leaderboardactivity.java中的代码片段

if (leaderboards.get(1).getName().equalsIgnoreCase(displayName)) {

private void getLeaderboard() {

        databaseLeaderboard.orderByChild("score").limitToLast((int) totalValue).addChildEventListener(new ChildEventListener() {
            @Override
            public void onChildAdded(DataSnapshot dataSnapshot, String prevChildKey) {
                Leaderboard leaderboard = dataSnapshot.getValue(Leaderboard.class);
                leaderboards.add(leaderboard);

                if (leaderboards.size() >= (int) totalValue) {
                    Collections.reverse(leaderboards);
                    leaderboardAdapterNew.notifyDataSetChanged();
                }

                if (leaderboards.size() == totalValue) {


                    if (leaderboards.get(0).getName().equalsIgnoreCase(displayName)) {
                        txtUname1.setText("Me");
                    } else {
                        txtUname1.setText(leaderboards.get(0).getName());
                    }
                    if (leaderboards.get(1).getName().equalsIgnoreCase(displayName)) {
                        txtUname2.setText("Me");
                    } else {
                        txtUname2.setText(leaderboards.get(1).getName());
                    }
                    if (leaderboards.get(2).getName().equalsIgnoreCase(displayName)) {
                        txtUname3.setText("Me");
                    } else {
                        txtUname3.setText(leaderboards.get(2).getName());
                    }

---

有人能告诉我哪里是我的错吗？

是的，您试图访问一个不存在的索引：

更改此项：

if (leaderboards.size() == totalValue) {

为此：

if (leaderboards.size() == totalValue && totalValue > 2) {

---

你的排行榜。get（1）一无所获。这就是为什么你会遇到这个错误。你正在访问一个数组中的索引1，该数组只包含1项（因此最高的合法索引为0）。请检查下面的答案。我不认为上面的代码是对崩溃的指责。你能分享你的适配器吗？LeadboardActivity.java第167行？下次请尝试正确格式化你的代码，它将帮助其他人回答你的问题。谢谢。兄弟，谢谢你帮我做作业。事实上，我不是一个开发人员，我从codecanyon购买了这个项目，现在作者没有回复我的消息，所以最后在3天后我在stackoverflow上问了这个问题。谢谢你