Question

我正在创建一个应用程序，在活动中我收到来自firebase的数据列表，如果数据引用为空则应用程序崩溃，我尝试吐司如果传入列表大小大于-1那么它意味着没有找到数据所以Toast一条消息没有结果，但它没有工作

gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
            view.setSelected(true);
            InComingDataList.clear();
            final String BG = adapterView.getItemAtPosition(i).toString();
            Ref = FirebaseDatabase.getInstance().getReference().child("RequestsOrderByBlood").child(BG);
            Ref.addChildEventListener(new ChildEventListener() {
                @Override
                public void onChildAdded(DataSnapshot dataSnapshot, String s) {
                    if (dataSnapshot.getValue(subRequest.class) != null) {
                        InComingDataList.add(dataSnapshot.getValue(subRequest.class));
                        Collections.reverse(InComingDataList);
                        t.setVisibility(View.GONE);
                        t22.setText("Showing BloodRequests for " + BG);
                        adapter.notifyDataSetChanged();
                        RecView.setOnScrollListener(new RecyclerView.OnScrollListener() {
                            @Override
                            public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
                                super.onScrolled(recyclerView, dx, dy);
                                int position = ((LinearLayoutManager) recyclerView.getLayoutManager()).findFirstVisibleItemPosition();
                                listLength.setText(Integer.toString(position + 1) + " / " + adapter.getItemCount());
                            }
                        });
                    } else {
                        Toast.makeText(viewRequest.this, "Sorry No Found", Toast.LENGTH_SHORT).show();
                    }

                }

                @Override
                public void onChildChanged(DataSnapshot dataSnapshot, String s) {

                }

                @Override
                public void onChildRemoved(DataSnapshot dataSnapshot) {

                }

                @Override
                public void onChildMoved(DataSnapshot dataSnapshot, String s) {

                }

                @Override
                public void onCancelled(DatabaseError databaseError) {

                }
            });
                listLength.setVisibility(View.VISIBLE);


        }
    });

logcat的

ava.lang.IndexOutOfBoundsException：检测到不一致。无效项目位置1（偏移：1）.state：2 在 android.support.v7.widget.RecyclerView $ Recycler.tryGetViewHolderForPositionByDeadline（RecyclerView.java:5546）在 android.support.v7.widget.RecyclerView $ Recycler.getViewForPosition（RecyclerView.java:5482）在 android.support.v7.widget.RecyclerView $ Recycler.getViewForPosition（RecyclerView.java:5478）在 android.support.v7.widget.LinearLayoutManager $ LayoutState.next（LinearLayoutManager.java:2215）在 android.support.v7.widget.LinearLayoutManager.layoutChunk（LinearLayoutManager.java:1542）在 android.support.v7.widget.LinearLayoutManager.fill（LinearLayoutManager.java:1502）在 android.support.v7.widget.LinearLayoutManager.scrollBy（LinearLayoutManager.java:1316）在 android.support.v7.widget.LinearLayoutManager.scrollHorizontallyBy（LinearLayoutManager.java:1049）在 android.support.v7.widget.RecyclerView.scrollByInternal（RecyclerView.java:1723）在 android.support.v7.widget.RecyclerView.onTouchEvent（RecyclerView.java:2927）在android.view.View.dispatchTouchEvent（View.java:9998）在 android.view.ViewGroup.dispatchTransformedTouchEvent（ViewGroup.java:2828）在android.view.ViewGroup.dispatchTouchEvent（ViewGroup.java:2499）在 android.view.ViewGroup.dispatchTransformedTouchEvent（ViewGroup.java:2839）在android.view.ViewGroup.dispatchTouchEvent（ViewGroup.java:2514）在 android.view.ViewGroup.dispatchTransformedTouchEvent（ViewGroup.java:2839）在android.view.ViewGroup.dispatchTouchEvent（ViewGroup.java:2514）在 android.view.ViewGroup.dispatchTransformedTouchEvent（ViewGroup.java:2839）在android.view.ViewGroup.dispatchTouchEvent（ViewGroup.java:2514）在 android.view.ViewGroup.dispatchTransformedTouchEvent（ViewGroup.java:2839）在android.view.ViewGroup.dispatchTouchEvent（ViewGroup.java:2514）在 android.view.ViewGroup.dispatchTransformedTouchEvent（ViewGroup.java:2839）在android.view.ViewGroup.dispatchTouchEvent（ViewGroup.java:2514）在 android.view.ViewGroup.dispatchTransformedTouchEvent（ViewGroup.java:2839）在android.view.ViewGroup.dispatchTouchEvent（ViewGroup.java:2514）在 android.view.ViewGroup.dispatchTransformedTouchEvent（ViewGroup.java:2839）在android.view.ViewGroup.dispatchTouchEvent（ViewGroup.java:2514）在 com.android.internal.policy.PhoneWindow $ DecorView.superDispatchTouchEvent（PhoneWindow.java:2816）在 com.android.internal.policy.PhoneWindow.superDispatchTouchEvent（PhoneWindow.java:1848）在android.app.Activity.dispatchTouchEvent（Activity.java:3046）在 android.support.v7.view.WindowCallbackWrapper.dispatchTouchEvent（WindowCallbackWrapper.java:69）在 com.android.internal.policy.PhoneWindow $ DecorView.dispatchTouchEvent（PhoneWindow.java:2777）在android.view.View.dispatchPointerEvent（View.java:10233）在 android.view.ViewRootImpl $ ViewPostImeInputStage.processPointerEvent（ViewRootImpl.java:5397）在 android.view.ViewRootImpl $ ViewPostImeInputStage.onProcess（ViewRootImpl.java:5233）在 android.view.ViewRootImpl $ InputStage.deliver（ViewRootImpl.java:4673）在 android.view.ViewRootImpl $ InputStage.onDeliverToNext（ViewRootImpl.java:4726）在 android.view.ViewRootImpl $ InputStage.forward（ViewRootImpl.java:4692）在 android.view.ViewRootImpl $ AsyncInputStage.forward（ViewRootImpl.java:4834）在android.view.ViewRootImpl $ InputStage.apply（ViewRootImpl.java:4700）在 android.view.ViewRootImpl $ AsyncInputStage.apply（ViewRootImpl.java:4891）在 android.view.ViewRootImpl $ InputStage.deliver（ViewRootImpl.java:4673）在 android.view.ViewRootImpl $ InputStage.onDeliverToNext（ViewRootImpl.java:4726）在 android.view.ViewRootImpl $ InputStage.forward（ViewRootImpl.java:4692）在android.view.ViewRootImpl $ InputStage.apply（ViewRootImpl.java:4700）在 android.view.ViewRootImpl $ InputStage.deliver（ViewRootImpl.java:4673）在android.view.ViewRootImpl.deliverInputEvent（ViewRootImpl.java:7359）在 android.view.ViewRootImpl.doProcessInputEvents（ViewRootImpl.java:7237）在android.view.ViewRootImpl.enqueueInputEvent（ViewRootImpl.java

Firebase数据库错误

0 个答案: