java - 添加 notifyDataSetChanged() 后检测到不一致错误

Question

我在制作 Activity 日志时遇到无法向下滚动的问题，不一致错误不断弹出。我也添加了 notifyDataSetChanged 方法，但我仍然无法修复错误。

这是我遇到的错误

java.lang.IndexOutOfBoundsException: Inconsistency detected. Invalid item position 7(offset:7).state:11 android.support.v7.widget.RecyclerView{edb17ac 

这是我的适配器代码

public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder>{

private List<ListItem> listItems;
private Context context;

public MyAdapter(List<ListItem> listItems, Context context) {
    this.listItems = listItems;
    this.context = context;
}

public MyAdapter(Context applicationContext, List<ListItem> listItems) {
}

@NonNull
@Override
public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
    View v = LayoutInflater.from(parent.getContext())
            .inflate(R.layout.list_item, parent, false);
    return new ViewHolder(v);
}

@Override
public void onBindViewHolder(@NonNull ViewHolder holder, int position) {

    for(int i=0;i<listItems.size(); i++){
        if (listItems.get(position).getHead().equals("Time")){
            listItems.remove(listItems.get(position));
        }
    }
    ListItem listItem = listItems.get(position);
    String key = listItem.getHead();
    if (key.equals("LockTime")) {
        holder.textViewHead.setText(listItem.getTime());
        holder.textViewDesc.setText(listItem.getDesc());
        holder.layout.setBackground(ContextCompat.getDrawable(context, R.drawable.red_gradient));
        holder.image1.setImageResource(R.drawable.lockwhite);
        holder.image2.setImageResource(R.drawable.lockwhite);
    } else if (key.equals("UnlockTime")) {
        holder.textViewHead.setText(listItem.getTime());
        holder.textViewDesc.setText(listItem.getDesc());
        holder.layout.setBackground(ContextCompat.getDrawable(context, R.drawable.green_gradient));
        holder.image1.setImageResource(R.drawable.unlockwhite);
        holder.image2.setImageResource(R.drawable.unlockwhite);
    }
}

@Override
public int getItemCount() {
    return listItems.size();
}
public class ViewHolder extends RecyclerView.ViewHolder{

    public TextView textViewHead;
    public TextView textViewDesc;
    public RelativeLayout layout;
    public ImageView image1;
    public ImageView image2;


    public ViewHolder(View itemView) {
        super(itemView);

        textViewHead = (TextView) itemView.findViewById(R.id.textViewHead);
        textViewDesc = (TextView) itemView.findViewById(R.id.textViewDesc);
        layout= (RelativeLayout) itemView.findViewById(R.id.relativelayout);
        image1 = itemView.findViewById(R.id.padlock1);
        image2 = itemView.findViewById(R.id.padlock2);
    }
  }



}

这是我的 Activity

public class ActivityLog extends AppCompatActivity {

private RecyclerView recyclerView;
private RecyclerView.Adapter adapter;

private List<ListItem> listItems;

SwipeRefreshLayout swipe;

DatabaseReference database;
LinearLayout lLayout;
@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    recyclerView = (RecyclerView) findViewById(R.id.recycle);
    recyclerView.setHasFixedSize(true);
    // SharedPreferences preferences=getSharedPreferences(LOCK_PREFS,MODE_PRIVATE);
    database = FirebaseDatabase.getInstance().getReference("Activity Log/device321");
    swipe = findViewById(R.id.swiper);
    listItems = new ArrayList<>();

    database.addValueEventListener(new ValueEventListener() {
        @Override
        public void onDataChange(DataSnapshot dataSnapshot) {
            for (DataSnapshot usersnapshot : dataSnapshot.getChildren()) {
                Map<String, String> map = (Map<String, String>) usersnapshot.getValue();
                for (Map.Entry<String, String> entry : map.entrySet()) {
                    listItems.add(new ListItem(entry.getKey(), entry.getValue(),usersnapshot.child("Time").getValue().toString()
                    ));
                }
            }
            recyclerView.setAdapter(new MyAdapter(getApplicationContext(),listItems));
            adapter.notifyDataSetChanged();
            adapter = new MyAdapter(listItems, ActivityLog.this);
            recyclerView.setAdapter(adapter);

        }


        @Override
        public void onCancelled(DatabaseError databaseError) {

        }
    });

    swipe.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
        @Override
        public void onRefresh() {
            database.addValueEventListener(new ValueEventListener() {
                @Override
                public void onDataChange(DataSnapshot dataSnapshot) {
                    for (DataSnapshot usersnapshot : dataSnapshot.getChildren()) {
                        Map<String, String> map = (Map<String, String>) usersnapshot.getValue();
                        for (Map.Entry<String, String> entry : map.entrySet()) {
                            listItems.add(new ListItem(entry.getKey(), entry.getValue(),usersnapshot.child("Time").getValue().toString()
                            ));
                        }
                    }

                    recyclerView.setAdapter(new MyAdapter(getApplicationContext(),listItems));
                    adapter = new MyAdapter(listItems, ActivityLog.this);
                    recyclerView.setAdapter(adapter);
                }


                @Override
                public void onCancelled(DatabaseError databaseError) {

                }
            });
            new Handler().postDelayed(new Runnable() {
                @Override
                public void run() {
                    swipe.setRefreshing(false);
                }
            },2000);
            listItems.clear();
        }
    });
  }
}

如果有任何帮助，我们将不胜感激

Answer 1

当你绑定(bind) viewholder 时，你不应该从列表中删除项目，因为你改变了位置并且需要重新创建 RecyclerView。在构造函数中或适配器以外的任何地方删除它们。

public MyAdapter(List<ListItem> listItems, Context context) {
    for(int i=0;i<listItems.size(); i++){
        if (listItems.get(position).getHead().equals("Time")){
            listItems.remove(listItems.get(position));
        }
     }
     this.listItems = listItems;
     this.context = context;
}