Question

我有一个包含多种视图类型的recyclerview。基本上，onclick按钮，我想循环遍历所有recyclerview的子项（包括屏幕上看不到的视图）并将其保存到Firebase。然后，我想从Firebase获取该信息，并使用该数据重新填充我的recyclerview。我该怎么做？我的问题是在recyclerview上调用getChildCount（）只会获取屏幕上的可见子项。但是，我需要所有的孩子。我是以正确的方式来做这件事的吗？或者我应该在屏幕上显示数据时使用数据填充我的视图？

澄清代码

这是我用来获取数据的内容，以便我可以将其插入Firebase

int numberOfViews = displayWorkoutAdapter.rowTypeList.size() - 1;
                                    Log.d("numberOfViews", String.format("%s", numberOfViews));
                                    for (int a = 0; a < numberOfViews; a++) {
                                        RowType rowType = displayWorkoutAdapter.rowTypeList.get(a);
                                        Log.d("rowTypeClass", rowType.getClass().toString());

                                        if (rowType.getClass() == ExerciseModel.class) {
                                            ExerciseModel exerciseModel = (ExerciseModel) rowType;
                                            String exerciseString = exerciseModel.getExercise();
                                            String weightString = exerciseModel.getWeight();
                                            String setString = exerciseModel.getSets();
                                            String repsString = exerciseModel.getReps();
                                            Log.d("exerciseString", exerciseString);


                                            insertDataToTable(tableName, exerciseView, null, exerciseString, weightString, setString, repsString, null, null, "0");

                                        }

OnBindViewHolder

    @Override
public void onBindViewHolder(final RecyclerView.ViewHolder holder, int position){

    if(holder instanceof ExerciseRowHolder) {
        ((ExerciseRowHolder) holder).exercise.setText(((ExerciseModel) rowTypeList.get(position)).getExercise());
        ((ExerciseRowHolder) holder).weight.setText(((ExerciseModel) rowTypeList.get(position)).getWeight());
        ((ExerciseRowHolder) holder).set.setText(((ExerciseModel) rowTypeList.get(position)).getSets());
        ((ExerciseRowHolder) holder).rep.setText(((ExerciseModel) rowTypeList.get(position)).getReps());
        ((ExerciseRowHolder) holder).dragHandle.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {
                if (event.getAction() == MotionEvent.ACTION_DOWN) {
                    mDragStartListener.onStartDrag(holder);
                }
                return false;
            }
        });
        ((ExerciseRowHolder) holder).exercise.setAdapter(getExerciseAdapter(home.getContext()));
    }

ExerciseRowHolder类

    public static class ExerciseRowHolder extends RecyclerView.ViewHolder{

    public ImageView dragHandle;
    public EditText weight;
    public EditText set;
    public EditText rep;
    public AutoCompleteTextView exercise;
    public ExerciseRowTextListener exerciseRowTextListener;

    public ExerciseRowHolder(View view, ExerciseRowTextListener exerciseRowTextListener){
        super(view);

        dragHandle = view.findViewById(R.id.reorder);
        weight = view.findViewById(R.id.weight);
        set = view.findViewById(R.id.sets);
        rep = view.findViewById(R.id.reps);
        exercise = view.findViewById(R.id.autoCompleteTextView);


    }
}

Answer 1

adapter.notifyDataSetChanged（）是活动中更改所有数据的方法...您可以在活动中执行所有firebase操作，然后您可以调用此方法..这将更新所有数据。

Answer 2

将数据存储在适配器而不是视图中，请参阅：RecyclerView Creating Lists and Cards

onclick按钮，我想循环遍历所有recyclerview的子项（包括屏幕上看不到的视图）并将其保存到Firebase。

要循环浏览所有recyclerview的数据，而不是使用recyclerview.getChildCount()，请使用adapter.getItemCount()。

然后，我想从Firebase获取该信息，并使用该数据重新填充我的recyclerview。我该怎么做呢？

从firebase获取所有数据后，将数据存储在适配器中。然后使用adapter.notifyDataSetChanged()

示例：

你的适配器：公共类YourAdapter扩展了RecyclerView.Adapter { private ArrayList mData;

public AppPickerGridListAdapter(@NonNull Context context, ArrayList<ExerciseModel> apps) {
    mData = apps;
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
   // create a new view
    View v = (View) LayoutInflater.from(parent.getContext())
            .inflate(R.layout.your_view_layout, parent, false);
    // set the view's size, margins, paddings and layout parameters
    ...
    ExerciseRowHolder vh = new ExerciseRowHolder(v, exerciseRowHolderListener);
    vh..dragHandle.setOnTouchListener(new View.OnTouchListener() {
        @Override
        public boolean onTouch(View v, MotionEvent event) {
            if (event.getAction() == MotionEvent.ACTION_DOWN) {
                mDragStartListener.onStartDrag(holder);
            }
            return false;
        }
    });
    return vh;
}

@Override
public void onBindViewHolder(ViewHolder holder, int position) {
    ExerciseModel item = mData.get(position);
    ((ExerciseRowHolder) holder).exercise.setText(item.getExercise());
    ((ExerciseRowHolder) holder).weight.setText(item.getWeight());
    ((ExerciseRowHolder) holder).set.setText(item.getSets());
    ((ExerciseRowHolder) holder).rep.setText(item.getReps());

}

@Override
public int getItemCount() {
    return mData.size();
}

public ExerciseModel getItem(int position) {
   return mData.get(position);
}

public ArrayList<ExerciseModel> getData() {
    return mData;
}

public void setData(ArrayList<ExerciseModel> data) {
   mData = data;
   notifyDataSetChanged();
}
}

点击保存按钮后的活动：

ArrayList<ExerciseModel> data = mAdapter.getData();
// save this data to firebase

从firebase获取数据后：

ArrayList<ExcerciseModal> data = getFirebaseData();
mAdapter.setData(data);

希望有所帮助

Recyclerview更新所有视图

2 个答案: