我的问题是，当我不使用android studio中的绿色播放按钮运行应用程序时，我的应用程序崩溃了，下一个问题是导致错误的行没有显示。
这是日志聊天室：
`08-17 11:34:03.312 6339-6339/com.test.test.test E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.test.test.test, PID: 6339
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)08-17 11:34:03.313 6339-6339/com.test.test.test E/AndroidRuntime: 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)`
And here is a sniped of my code:
public class MainActivity extends AppCompatActivity implements
NavigationView.OnNavigationItemSelectedListener,
RecyclerItemTouchHelper.RecyclerItemTouchHelperListener {
private FirebaseFirestore db;
private RecyclerView recyclerView;
private RecyclerView.LayoutManager recyclerViewLayoutManager;
public NoteListAdapter adapter;
private List<Note> notesList = new ArrayList<>();
public static NoteViewHolder ch;
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);
recyclerViewLayoutManager = new LinearLayoutManager(MainActivity.this, LinearLayoutManager.VERTICAL, false);
recyclerView.setLayoutManager(recyclerViewLayoutManager);
recyclerView.setItemAnimator(new DefaultItemAnimator());
recyclerView.addItemDecoration(new DividerItemDecoration(this, DividerItemDecoration.VERTICAL));
recyclerView.setAdapter(adapter);
view_design = 0;
//SnapHelper helper = new LinearSnapHelper();
//helper.attachToRecyclerView(recyclerView);
ItemTouchHelper.SimpleCallback itemTouchHelperCallback = new RecyclerItemTouchHelper(0, ItemTouchHelper.LEFT, MainActivity.this);
new ItemTouchHelper(itemTouchHelperCallback).attachToRecyclerView(recyclerView);
makeAdapter();
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;
}
for (DocumentSnapshot doc : documentSnapshots) {
Note note = doc.toObject(Note.class);
note.setId(doc.getId());
notesList.add(note);
}
adapter.notifyDataSetChanged();
recyclerView.setAdapter(adapter);
}
});
}
private void makeAdapter() {
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);
adapter.notifyDataSetChanged();
recyclerView.setAdapter(adapter);
setAlarms();
}
@Override
public void onStart() {
super.onStart();
adapter.startListening();
}
@Override
public void onStop() {
super.onStop();
adapter.stopListening();
}
@Override
protected void onResume() {
super.onResume();
recyclerView.setAdapter(adapter);
adapter.startListening();
adapter.notifyDataSetChanged();
}}`
因此，由于错误，我认为ArrayList出了点问题。但我无法弄清楚出了什么问题，因为当我启动有关绿色播放按钮的应用程序时，一切正常。抱歉，但是我以前从未遇到过这样的问题。
我希望有人能解决。
提前致谢。
答案 0 :(得分：1)
1）从recyclerView.setAdapter(adapter);中删除onCreate()，此时adapter为null，稍后您调用makeAdapter();，它将设置适配器。
2）如果下一条语句为adapter.notifyDataSetChanged();，则不需要recyclerView.setAdapter(adapter);，因为无论如何都会设置新的适配器