如何修复 java.lang.ArrayIndexOutOfBoundsException: length=0;指数=-1
How to fix java.lang.ArrayIndexOutOfBoundsException: length=0; index=-1
我需要帮助。所以我一直在修补 android 工作室，每次我使用 onTextChanged 在文本字段中键入内容时，我的应用程序都会崩溃，它会在 logcat [=22] 中打印此错误=]java.lang.ArrayIndexOutOfBoundsException：长度=0；指数=-1。我如何解决它？提前致谢。
这是我的 NotesFragment.java:
package com.example.reminderapp;
import android.content.Intent;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import com.google.android.material.floatingactionbutton.FloatingActionButton;
import java.util.ArrayList;
import static android.R.layout.simple_list_item_1;
public class NotesFragment extends Fragment {
View view;
static ArrayList<String> notes = new ArrayList<>();
static ArrayAdapter<String> arrayAdapter;
FloatingActionButton fabfrNotes;
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
if(notes.size()==0)
{
view = inflater.inflate(R.layout.fragment_notes_empty, container, false);
fabfrNotes = view.findViewById(R.id.fabNotes);
fabfrNotes.setOnClickListener(v -> {
Intent intent= new Intent(getContext(), NoteEditorActivity.class);
startActivity(intent);
});
}
else
{
view = inflater.inflate(R.layout.fragment_notes, container, false);
ListView listView = view.findViewById(R.id.notesListView);
arrayAdapter = new ArrayAdapter<>(view.getContext(), simple_list_item_1, notes);
listView.setAdapter(arrayAdapter);
listView.setOnItemClickListener((parent, view, i, id) -> {
Intent intent = new Intent(getContext(), NoteEditorActivity.class);
intent.putExtra("noteId", i);
startActivity(intent);
});
}
return view;
}
}
这是我的 NoteEditorAcitivity.java:
package com.example.reminderapp;
import android.content.Intent;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.widget.EditText;
import androidx.appcompat.app.AppCompatActivity;
public class NoteEditorActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_note_editor);
EditText editTextTitle = findViewById(R.id.editTextNoteTitle);
EditText editTextContent = findViewById(R.id.editTextNoteContent);
Intent intent = getIntent();
int noteId = intent.getIntExtra("noteId", -1);
if(noteId!=-1){
editTextTitle.setText(NotesFragment.notes.get(noteId));
}
editTextTitle.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
NotesFragment.notes.set(noteId, String.valueOf(s));
NotesFragment.arrayAdapter.notifyDataSetChanged();
}
@Override
public void afterTextChanged(Editable s) {
}
});
}
}
这是我的 logcat:
java.lang.ArrayIndexOutOfBoundsException: length=0; index=-1
at java.util.ArrayList.set(ArrayList.java:455)
at com.example.reminderapp.NoteEditorActivity.onTextChanged(NoteEditorActivity.java:36)
at android.widget.TextView.sendOnTextChanged(TextView.java:10578)
at android.widget.TextView.handleTextChanged(TextView.java:10685)
at android.widget.TextView$ChangeWatcher.onTextChanged(TextView.java:13568)
at android.text.SpannableStringBuilder.sendTextChanged(SpannableStringBuilder.java:1267)
at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:576)
at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:507)
at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:37)
at android.text.method.QwertyKeyListener.onKeyDown(QwertyKeyListener.java:228)
at android.text.method.TextKeyListener.onKeyDown(TextKeyListener.java:141)
at android.widget.TextView.doKeyDown(TextView.java:8466)
at android.widget.TextView.onKeyDown(TextView.java:8240)
at android.view.KeyEvent.dispatch(KeyEvent.java:2842)
at android.view.View.dispatchKeyEvent(View.java:14247)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1959)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1959)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1959)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1959)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1959)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1959)
at com.android.internal.policy.DecorView.superDispatchKeyEvent(DecorView.java:476)
at com.android.internal.policy.PhoneWindow.superDispatchKeyEvent(PhoneWindow.java:1861)
at android.app.Activity.dispatchKeyEvent(Activity.java:4085)
at androidx.core.app.ComponentActivity.superDispatchKeyEvent(ComponentActivity.java:122)
at androidx.core.view.KeyEventDispatcher.dispatchKeyEvent(KeyEventDispatcher.java:84)
at androidx.core.app.ComponentActivity.dispatchKeyEvent(ComponentActivity.java:140)
at androidx.appcompat.app.AppCompatActivity.dispatchKeyEvent(AppCompatActivity.java:569)
at androidx.appcompat.view.WindowCallbackWrapper.dispatchKeyEvent(WindowCallbackWrapper.java:59)
at androidx.appcompat.app.AppCompatDelegateImpl$AppCompatWindowCallback.dispatchKeyEvent(AppCompatDelegateImpl.java:3054)
at com.android.internal.policy.DecorView.dispatchKeyEvent(DecorView.java:390)
at android.view.ViewRootImpl$ViewPostImeInputStage.processKeyEvent(ViewRootImpl.java:5947)
at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:5815)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:5310)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:5367)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:5333)
at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:5485)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:5341)
at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:5542)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:5314)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:5367)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:5333)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:5341)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:5314)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:5367)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:5333)
at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:5518)
at android.view.ViewRootImpl$ImeInputStage.onFinishedInputEvent(ViewRootImpl.java:5676)
at android.view.inputmethod.InputMethodManager$PendingEvent.run(InputMethodManager.java:3179)
at android.view.inputmethod.InputMethodManager.invokeFinishedInputEventCallback(InputMethodManager.java:2721)
2021-03-02 15:49:39.538 17484-17484/com.example.reminderapp E/AndroidRuntime: at android.view.inputmethod.InputMethodManager.finishedInputEvent(InputMethodManager.java:2712)
at android.view.inputmethod.InputMethodManager$ImeInputEventSender.onInputEventFinished(InputMethodManager.java:3156)
at android.view.InputEventSender.dispatchInputEventFinished(InputEventSender.java:143)
at android.os.MessageQueue.nativePollOnce(Native Method)
at android.os.MessageQueue.next(MessageQueue.java:335)
at android.os.Looper.loop(Looper.java:183)
at android.app.ActivityThread.main(ActivityThread.java:7656)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)
当您尝试访问索引处不存在的项目时，您可能会遇到异常 ArrayIndexOutOfBoundsException。假设您有 10 个元素的数组，索引从 0 到 9。如果您尝试访问第 11 个或更多索引，您将得到 ArrayIndexOutOfBoundsException.
NotesFragment.notes.set(noteId, String.valueOf(s)); NotesFragment.arrayAdapter.notifyDataSetChanged();
上面的第一行试图更新数组中索引 noteId 处的项目，您收到此错误是因为该索引处没有项目存在。
请确保该项目存在于索引 noteId 处，您可以在此处添加一个断点并检查 noteId 的值
我需要帮助。所以我一直在修补 android 工作室，每次我使用 onTextChanged 在文本字段中键入内容时，我的应用程序都会崩溃，它会在 logcat [=22] 中打印此错误=]java.lang.ArrayIndexOutOfBoundsException：长度=0；指数=-1。我如何解决它？提前致谢。
这是我的 NotesFragment.java:
package com.example.reminderapp;
import android.content.Intent;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import com.google.android.material.floatingactionbutton.FloatingActionButton;
import java.util.ArrayList;
import static android.R.layout.simple_list_item_1;
public class NotesFragment extends Fragment {
View view;
static ArrayList<String> notes = new ArrayList<>();
static ArrayAdapter<String> arrayAdapter;
FloatingActionButton fabfrNotes;
@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
if(notes.size()==0)
{
view = inflater.inflate(R.layout.fragment_notes_empty, container, false);
fabfrNotes = view.findViewById(R.id.fabNotes);
fabfrNotes.setOnClickListener(v -> {
Intent intent= new Intent(getContext(), NoteEditorActivity.class);
startActivity(intent);
});
}
else
{
view = inflater.inflate(R.layout.fragment_notes, container, false);
ListView listView = view.findViewById(R.id.notesListView);
arrayAdapter = new ArrayAdapter<>(view.getContext(), simple_list_item_1, notes);
listView.setAdapter(arrayAdapter);
listView.setOnItemClickListener((parent, view, i, id) -> {
Intent intent = new Intent(getContext(), NoteEditorActivity.class);
intent.putExtra("noteId", i);
startActivity(intent);
});
}
return view;
}
}
这是我的 NoteEditorAcitivity.java:
package com.example.reminderapp;
import android.content.Intent;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.widget.EditText;
import androidx.appcompat.app.AppCompatActivity;
public class NoteEditorActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_note_editor);
EditText editTextTitle = findViewById(R.id.editTextNoteTitle);
EditText editTextContent = findViewById(R.id.editTextNoteContent);
Intent intent = getIntent();
int noteId = intent.getIntExtra("noteId", -1);
if(noteId!=-1){
editTextTitle.setText(NotesFragment.notes.get(noteId));
}
editTextTitle.addTextChangedListener(new TextWatcher() {
@Override
public void beforeTextChanged(CharSequence s, int start, int count, int after) {
}
@Override
public void onTextChanged(CharSequence s, int start, int before, int count) {
NotesFragment.notes.set(noteId, String.valueOf(s));
NotesFragment.arrayAdapter.notifyDataSetChanged();
}
@Override
public void afterTextChanged(Editable s) {
}
});
}
}
这是我的 logcat:
java.lang.ArrayIndexOutOfBoundsException: length=0; index=-1
at java.util.ArrayList.set(ArrayList.java:455)
at com.example.reminderapp.NoteEditorActivity.onTextChanged(NoteEditorActivity.java:36)
at android.widget.TextView.sendOnTextChanged(TextView.java:10578)
at android.widget.TextView.handleTextChanged(TextView.java:10685)
at android.widget.TextView$ChangeWatcher.onTextChanged(TextView.java:13568)
at android.text.SpannableStringBuilder.sendTextChanged(SpannableStringBuilder.java:1267)
at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:576)
at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:507)
at android.text.SpannableStringBuilder.replace(SpannableStringBuilder.java:37)
at android.text.method.QwertyKeyListener.onKeyDown(QwertyKeyListener.java:228)
at android.text.method.TextKeyListener.onKeyDown(TextKeyListener.java:141)
at android.widget.TextView.doKeyDown(TextView.java:8466)
at android.widget.TextView.onKeyDown(TextView.java:8240)
at android.view.KeyEvent.dispatch(KeyEvent.java:2842)
at android.view.View.dispatchKeyEvent(View.java:14247)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1959)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1959)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1959)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1959)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1959)
at android.view.ViewGroup.dispatchKeyEvent(ViewGroup.java:1959)
at com.android.internal.policy.DecorView.superDispatchKeyEvent(DecorView.java:476)
at com.android.internal.policy.PhoneWindow.superDispatchKeyEvent(PhoneWindow.java:1861)
at android.app.Activity.dispatchKeyEvent(Activity.java:4085)
at androidx.core.app.ComponentActivity.superDispatchKeyEvent(ComponentActivity.java:122)
at androidx.core.view.KeyEventDispatcher.dispatchKeyEvent(KeyEventDispatcher.java:84)
at androidx.core.app.ComponentActivity.dispatchKeyEvent(ComponentActivity.java:140)
at androidx.appcompat.app.AppCompatActivity.dispatchKeyEvent(AppCompatActivity.java:569)
at androidx.appcompat.view.WindowCallbackWrapper.dispatchKeyEvent(WindowCallbackWrapper.java:59)
at androidx.appcompat.app.AppCompatDelegateImpl$AppCompatWindowCallback.dispatchKeyEvent(AppCompatDelegateImpl.java:3054)
at com.android.internal.policy.DecorView.dispatchKeyEvent(DecorView.java:390)
at android.view.ViewRootImpl$ViewPostImeInputStage.processKeyEvent(ViewRootImpl.java:5947)
at android.view.ViewRootImpl$ViewPostImeInputStage.onProcess(ViewRootImpl.java:5815)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:5310)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:5367)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:5333)
at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:5485)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:5341)
at android.view.ViewRootImpl$AsyncInputStage.apply(ViewRootImpl.java:5542)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:5314)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:5367)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:5333)
at android.view.ViewRootImpl$InputStage.apply(ViewRootImpl.java:5341)
at android.view.ViewRootImpl$InputStage.deliver(ViewRootImpl.java:5314)
at android.view.ViewRootImpl$InputStage.onDeliverToNext(ViewRootImpl.java:5367)
at android.view.ViewRootImpl$InputStage.forward(ViewRootImpl.java:5333)
at android.view.ViewRootImpl$AsyncInputStage.forward(ViewRootImpl.java:5518)
at android.view.ViewRootImpl$ImeInputStage.onFinishedInputEvent(ViewRootImpl.java:5676)
at android.view.inputmethod.InputMethodManager$PendingEvent.run(InputMethodManager.java:3179)
at android.view.inputmethod.InputMethodManager.invokeFinishedInputEventCallback(InputMethodManager.java:2721)
2021-03-02 15:49:39.538 17484-17484/com.example.reminderapp E/AndroidRuntime: at android.view.inputmethod.InputMethodManager.finishedInputEvent(InputMethodManager.java:2712)
at android.view.inputmethod.InputMethodManager$ImeInputEventSender.onInputEventFinished(InputMethodManager.java:3156)
at android.view.InputEventSender.dispatchInputEventFinished(InputEventSender.java:143)
at android.os.MessageQueue.nativePollOnce(Native Method)
at android.os.MessageQueue.next(MessageQueue.java:335)
at android.os.Looper.loop(Looper.java:183)
at android.app.ActivityThread.main(ActivityThread.java:7656)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:592)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:947)
当您尝试访问索引处不存在的项目时，您可能会遇到异常 ArrayIndexOutOfBoundsException。假设您有 10 个元素的数组，索引从 0 到 9。如果您尝试访问第 11 个或更多索引，您将得到 ArrayIndexOutOfBoundsException.
NotesFragment.notes.set(noteId, String.valueOf(s)); NotesFragment.arrayAdapter.notifyDataSetChanged();
上面的第一行试图更新数组中索引 noteId 处的项目，您收到此错误是因为该索引处没有项目存在。
请确保该项目存在于索引 noteId 处，您可以在此处添加一个断点并检查 noteId 的值