仅在恢复活动时获取IndexOutOfBoundsException [英] Getting IndexOutOfBoundsException only when resume Activity
本文介绍了仅在恢复活动时获取IndexOutOfBoundsException的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我的问题是，当恢复MainActivity时，我的应用程序崩溃了.
错误是IndexOutOfBoundsException，不幸的是没有特定的行.错误显示为Index: 0, Size: 0.
My problem is that my App crashes when the MainActivity gets resumed.
The error is an IndexOutOfBoundsException, unfortunately without a specific line. And the error says Index: 0, Size: 0.
据我所知，这意味着我的ArrayList为null，并且在初始化之前先调用它.但是自那起案件发生后的几天我一直在搜寻.我什么都没找到.
As I know this means that my ArrayList is null and I call it before I initialize it. But I searched since days after that case. I didn't find anything.
所以首先是错误:
08-28 13:10:24.232 18741-18741/com.test.test.test E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.test.test.test, PID: 18741
java.lang.IndexOutOfBoundsException: Index: 0, Size: 0
at java.util.ArrayList.get(ArrayList.java:411)
at com.firebase.ui.common.BaseObservableSnapshotArray.getSnapshot(BaseObservableSnapshotArray.java:70)
at com.firebase.ui.common.BaseObservableSnapshotArray.get(BaseObservableSnapshotArray.java:52)
at com.firebase.ui.firestore.FirestoreRecyclerAdapter.getItem(FirestoreRecyclerAdapter.java:83)
at com.firebase.ui.firestore.FirestoreRecyclerAdapter.onBindViewHolder(FirestoreRecyclerAdapter.java:125)
at android.support.v7.widget.RecyclerView$Adapter.onBindViewHolder(RecyclerView.java:6673)
at android.support.v7.widget.RecyclerView$Adapter.bindViewHolder(RecyclerView.java:6714)
at android.support.v7.widget.RecyclerView$Recycler.tryBindViewHolderByDeadline(RecyclerView.java:5647)
at android.support.v7.widget.RecyclerView$Recycler.tryGetViewHolderForPositionByDeadline(RecyclerView.java:5913)
at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5752)
at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5748)
at android.support.v7.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:2232)
at android.support.v7.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1559)
at android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1519)
at android.support.v7.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:614)
at android.support.v7.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:3812)
at android.support.v7.widget.RecyclerView.dispatchLayout(RecyclerView.java:3529)
at android.support.v7.widget.RecyclerView.onLayout(RecyclerView.java:4082)
at android.view.View.layout(View.java:17689)
at android.view.ViewGroup.layout(ViewGroup.java:5575)
at android.support.constraint.ConstraintLayout.onLayout(ConstraintLayout.java:1858)
at android.view.View.layout(View.java:17689)
at android.view.ViewGroup.layout(ViewGroup.java:5575)
at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1079)
at android.view.View.layout(View.java:17689)
at android.view.ViewGroup.layout(ViewGroup.java:5575)
at android.widget.RelativeLayout.onLayout(RelativeLayout.java:1079)
at android.view.View.layout(View.java:17689)
at android.view.ViewGroup.layout(ViewGroup.java:5575)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
at android.view.View.layout(View.java:17689)
at android.view.ViewGroup.layout(ViewGroup.java:5575)
at android.support.design.widget.CoordinatorLayout.layoutChild(CoordinatorLayout.java:1191)
at android.support.design.widget.CoordinatorLayout.onLayoutChild(CoordinatorLayout.java:876)
at android.support.design.widget.CoordinatorLayout.onLayout(CoordinatorLayout.java:895)
at android.view.View.layout(View.java:17689)
at android.view.ViewGroup.layout(ViewGroup.java:5575)
at android.support.v4.widget.DrawerLayout.onLayout(DrawerLayout.java:1171)
at android.view.View.layout(View.java:17689)
at android.view.ViewGroup.layout(ViewGroup.java:5575)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
at android.view.View.layout(View.java:17689)
at android.view.ViewGroup.layout(ViewGroup.java:5575)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1741)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1585)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1494)
at android.view.View.layout(View.java:17689)
at android.view.ViewGroup.layout(ViewGroup.java:5575)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
at android.view.View.layout(View.java:17689)
at android.view.ViewGroup.layout(ViewGroup.java:5575)
at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1741)
at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1585)
at android.widget.LinearLayout.onLayout(LinearLayout.java:1494)
at android.view.View.layout(View.java:17689)
at android.view.ViewGroup.layout(ViewGroup.java:5575)
at android.widget.FrameLayout.layoutChildren(FrameLayout.java:323)
at android.widget.FrameLayout.onLayout(FrameLayout.java:261)
at com.android.internal.policy.DecorView.onLayout(DecorView.java:730)
at android.view.View.layout(View.java:17689)
at android.view.ViewGroup.layout(ViewGroup.java:5575)
at android.view.ViewRootImpl.performLayout(ViewRootImpl.java:2346)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:2068)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1254)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6343)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:874)
at android.view.Choreographer.doCallbacks(Choreographer.java:686)
at android.view.Choreographer.doFrame(Choreographer.java:621)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:860)
at android.os.Handler.handleCallback(Handler.java:751)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:241)
at android.app.ActivityThread.main(ActivityThread.java:6274)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)
这是我的代码的片段:
MainActivity:
And here is a snippet of my Code:
MainActivity:
public class MainActivity extends AppCompatActivity implements RecyclerItemTouchHelper.RecyclerItemTouchHelperListener, NoteListAdapter.NotesAdapterListener {
private FirebaseAuth mFirebaseAuth;
public FirebaseUser mFirebaseUser;
private FirebaseFirestore db;
private RecyclerView recyclerView;
private RecyclerView.LayoutManager recyclerViewLayoutManager;
public NoteListAdapter adapter;
private List<Note> notesList = new ArrayList<>();
private ListenerRegistration firestoreListener;
private RecyclerItemTouchHelper.RecyclerItemTouchHelperListener listener;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mFirebaseAuth = FirebaseAuth.getInstance();
mFirebaseUser = mFirebaseAuth.getInstance().getCurrentUser();
db = FirebaseFirestore.getInstance();
recyclerView = findViewById(R.id.rvNoteList);
FirebaseFirestoreSettings settings = new FirebaseFirestoreSettings.Builder().setPersistenceEnabled(true).build();
db.setFirestoreSettings(settings);
Query query = db.collection("users").document(firebase_user_uid).collection("notes");
FirestoreRecyclerOptions<Note> response = new FirestoreRecyclerOptions.Builder<Note>().setQuery(query, Note.class).build();
adapter = new NoteListAdapter(notesList, response, MainActivity.this, MainActivity.this);
recyclerViewLayoutManager = new LinearLayoutManager(MainActivity.this, LinearLayoutManager.VERTICAL, false);
recyclerView.setLayoutManager(recyclerViewLayoutManager);
recyclerView.setItemAnimator(new DefaultItemAnimator());
recyclerView.addItemDecoration(new CustomRecyclerViewDivider(this, LinearLayoutManager.VERTICAL, 16));
recyclerView.setAdapter(adapter);
ItemTouchHelper.SimpleCallback itemTouchHelperCallback = new RecyclerItemTouchHelper(0, ItemTouchHelper.LEFT, MainActivity.this);
new ItemTouchHelper(itemTouchHelperCallback).attachToRecyclerView(recyclerView);
firestoreListener = db.collection("users").document(firebase_user_uid).collection("notes")
.addSnapshotListener(new EventListener<QuerySnapshot>() {
@Override
public void onEvent(QuerySnapshot documentSnapshots, FirebaseFirestoreException e) {
if (e != null) {
Log.e("LOL", "Listen failed!", e);
return;
}
notesList.clear();
for (DocumentSnapshot doc : documentSnapshots) {
Note note = doc.toObject(Note.class);
note.setId(doc.getId());
notesList.add(note);
}
}
});
recyclerView.addOnItemTouchListener(new RecyclerViewTouchListener(getApplicationContext(), recyclerView, new RecyclerViewTouchListener.ClickListener() {
@Override
public void onClick(View view, int position) {
if (notesList != null || notesList.size() <= 0) {
Note note = notesList.get(position);
updateNote(note);
}
}
@Override
public void onLongClick(View view, int position) {
}
}));
}
@Override
public void onStart() {
super.onStart();
if (adapter != null) {
adapter.startListening();
}
}
@Override
public void onStop() {
super.onStop();
if (adapter != null) {
adapter.stopListening();
}
}
@Override
protected void onResume() {
super.onResume();
if (adapter != null) {
adapter.startListening();
}
}}
这是NoteListAdapter:
And here is the NoteListAdapter:
public class NoteListAdapter extends FirestoreRecyclerAdapter<Note, NoteListAdapter.NoteViewHolder> implements Filterable{
private List<Note> notesList;
private List<Note> notesListFiltered;
private NotesAdapterListener listener;
private Context context;
public class NoteViewHolder extends RecyclerView.ViewHolder {
public TextView title, content;
public ImageView bg_note_image;
public RelativeLayout viewBackground, viewForeground;
public NoteViewHolder(View view) {
super(view);
title = view.findViewById(R.id.tvTitle);
content = view.findViewById(R.id.tvContent);
bg_note_image = view.findViewById(R.id.note_image_view);
viewBackground = view.findViewById(R.id.view_background);
viewForeground = view.findViewById(R.id.view_foreground);
view.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
listener.onNoteSelected(notesListFiltered.get(getAdapterPosition()));
}
});
}
}
public NoteListAdapter(List<Note> notesList, FirestoreRecyclerOptions<Note> response, Context co, NotesAdapterListener listener) {
super(response);
context = co;
this.listener = listener;
this.notesList = notesList;
this.notesListFiltered = notesList;
}
@Override
protected void onBindViewHolder(NoteViewHolder holder, int position, Note model) {
if (notesListFiltered != null || notesList != null) {
final Note note = notesListFiltered.get(position);
holder.title.setText(note.getTitle());
holder.content.setText(note.getContent());
if (note.getNote_image_url() != null) {
Glide.with(context).load(note.getNote_image_url()).into(holder.bg_note_image);
holder.bg_note_image.setVisibility(View.VISIBLE);
}
}
}
@Override
public NoteViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_note_view, parent, false);
return new NoteViewHolder(view);
}
@Override
public void onError(FirebaseFirestoreException e) {
Log.e("LOL", e.getMessage());
}
@Override
public int getItemCount() {
return notesListFiltered.size();
}
public void removeItem(int position) {
notesList.remove(position);
// notify the item removed by position
// to perform recycler view delete animations
// NOTE: don't call notifyDataSetChanged()
notifyItemRemoved(position);
}
public void restoreItem(Note item, int position) {
notesList.add(position, item);
// notify item added by position
notifyItemInserted(position);
}
@Override
public Filter getFilter() {
return new Filter() {
@Override
protected FilterResults performFiltering(CharSequence charSequence) {
String charString = charSequence.toString();
if (charString.isEmpty()) {
notesListFiltered = notesList;
} else {
List<Note> filteredList = new ArrayList<>();
for (Note row : notesList) {
// name match condition. this might differ depending on your requirement
// here we are looking for name or phone number match
if (row.getTitle().toLowerCase().contains(charString.toLowerCase()) || row.getContent().toLowerCase().contains(charString.toLowerCase())) {
filteredList.add(row);
}
}
notesListFiltered = filteredList;
}
FilterResults filterResults = new FilterResults();
filterResults.values = notesListFiltered;
return filterResults;
}
@Override
protected void publishResults(CharSequence charSequence, FilterResults filterResults) {
notesListFiltered = (ArrayList<Note>) filterResults.values;
notifyDataSetChanged();
}
};
}
public interface NotesAdapterListener {
void onNoteSelected(Note note);
}}
此外，我尝试这样做来找到特定的行，但没有成功:
And additionally I tried this to find a specific line, but without any success:
@Override
protected void onResume() {
try {
super.onResume();
} catch (Exception e) {
e.printStackTrace();
Log.d("LOL", e.getMessage(), e);
}
}
我真的希望有人能解决我的问题，因为自一个星期以来，我真的不知道如何解决这个问题.
I really hope anybody has a solution for my problem, because I really don't know how to fix this since one week.
谢谢.
推荐答案
检查以下代码.希望对您有帮助.您需要将所有firebase firestore逻辑替换为onResume()方法.
Check below code. Hope it will be helpful for you. You need to replace all firebase firestore logic to onResume() method.
public class MainActivity extends AppCompatActivity implements RecyclerItemTouchHelper.RecyclerItemTouchHelperListener, NoteListAdapter.NotesAdapterListener {
private FirebaseAuth mFirebaseAuth;
public FirebaseUser mFirebaseUser;
private FirebaseFirestore db;
private RecyclerView recyclerView;
private RecyclerView.LayoutManager recyclerViewLayoutManager;
public NoteListAdapter adapter;
private List<Note> notesList = new ArrayList<>();
private ListenerRegistration firestoreListener;
private RecyclerItemTouchHelper.RecyclerItemTouchHelperListener listener;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
recyclerView = findViewById(R.id.rvNoteList);
}
@Override
public void onStart() {
super.onStart();
if (adapter != null) {
adapter.startListening();
}
}
@Override
public void onStop() {
super.onStop();
if (adapter != null) {
adapter.stopListening();
}
}
@Override
protected void onResume() {
super.onResume();
mFirebaseAuth = FirebaseAuth.getInstance();
mFirebaseUser = mFirebaseAuth.getInstance().getCurrentUser();
db = FirebaseFirestore.getInstance();
if (adapter != null) {
adapter.startListening();
}
FirebaseFirestoreSettings settings = new FirebaseFirestoreSettings.Builder().setPersistenceEnabled(true).build();
db.setFirestoreSettings(settings);
Query query = db.collection("users").document(firebase_user_uid).collection("notes");
FirestoreRecyclerOptions<Note> response = new FirestoreRecyclerOptions.Builder<Note>().setQuery(query, Note.class).build();
adapter = new NoteListAdapter(notesList, response, MainActivity.this, MainActivity.this);
recyclerViewLayoutManager = new LinearLayoutManager(MainActivity.this, LinearLayoutManager.VERTICAL, false);
recyclerView.setLayoutManager(recyclerViewLayoutManager);
recyclerView.setItemAnimator(new DefaultItemAnimator());
recyclerView.addItemDecoration(new CustomRecyclerViewDivider(this, LinearLayoutManager.VERTICAL, 16));
recyclerView.setAdapter(adapter);
ItemTouchHelper.SimpleCallback itemTouchHelperCallback = new RecyclerItemTouchHelper(0, ItemTouchHelper.LEFT, MainActivity.this);
new ItemTouchHelper(itemTouchHelperCallback).attachToRecyclerView(recyclerView);
firestoreListener = db.collection("users").document(firebase_user_uid).collection("notes")
.addSnapshotListener(new EventListener<QuerySnapshot>() {
@Override
public void onEvent(QuerySnapshot documentSnapshots, FirebaseFirestoreException e) {
if (e != null) {
Log.e("LOL", "Listen failed!", e);
return;
}
notesList.clear();
for (DocumentSnapshot doc : documentSnapshots) {
Note note = doc.toObject(Note.class);
note.setId(doc.getId());
notesList.add(note);
}
}
});
recyclerView.addOnItemTouchListener(new RecyclerViewTouchListener(getApplicationContext(), recyclerView, new RecyclerViewTouchListener.ClickListener() {
@Override
public void onClick(View view, int position) {
if (notesList != null || notesList.size() <= 0) {
Note note = notesList.get(position);
updateNote(note);
}
}
@Override
public void onLongClick(View view, int position) {
}
}))
}}
这篇关于仅在恢复活动时获取IndexOutOfBoundsException的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
查看全文
