RecyclerView：在滚动期间不断更改数据

Question

我有一个 RecyclerView。每行都有一个开关按钮，我点击开关来改变它的状态。当我向下滚动并返回时，recyclerview 忽略了我在 switch 中所做的更改。所有回收站视图都将重置。

我想在滚动期间保留 recyclerview 中的任何更改。

这是我的适配器

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


    private List<Light> mList;
    private LightItemClickListener mListener;
    private MainActivity mMainActivity;

    public LightAdapter(List<Light> mList, LightItemClickListener mListener, MainActivity mMainActivity) {
        this.mList = mList;
        this.mListener = mListener;
        this.mMainActivity = mMainActivity;

    }

    @Override
    public LightViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.layout_item, parent, false);
        return new LightViewHolder(itemView);
    }

    @Override
    public void onBindViewHolder(RecyclerView.ViewHolder holder, final int position) {
        Light light = mList.get(position);
        ((LightViewHolder)holder).getmSwitch().setChecked(light.isLightIsActivated());
        ((LightViewHolder)holder).getmSeekBar().setProgress(light.getLightingValue());
        if(light.isLightIsActivated())
        {
            ((LightViewHolder)holder).getmSwitchOnTextView().setVisibility(View.VISIBLE);
            ((LightViewHolder)holder).getmSwitchOffTextView().setVisibility(View.GONE);
        } else
        {
            ((LightViewHolder)holder).getmSwitchOnTextView().setVisibility(View.GONE);
            ((LightViewHolder)holder).getmSwitchOffTextView().setVisibility(View.VISIBLE);
        }

        ((LightViewHolder)holder).getmLightNameTextView().setText(light.getLightName());
        ((LightViewHolder)holder).populateItemView(light, mListener,mMainActivity);



    }


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

    public void add(List<Light> list) {
        mList.clear();
        mList.addAll(list);
        notifyDataSetChanged();
    }
}

和我的 ViewHolder

public class LightViewHolder extends RecyclerView.ViewHolder {

    private Context mContext;

    private SeekBar mSeekBar;

    private Switch mSwitch;
    private TextView mSwitchOffTextView;
    private TextView mSwitchOnTextView;

    private TextView mLightNameTextView;

    public LightViewHolder(View itemView) {
        super(itemView);
        mSeekBar = itemView.findViewById(R.id.seekBar1);
        mSwitch = itemView.findViewById(R.id.switch1);
        mSwitchOffTextView = itemView.findViewById(R.id.switch_off_textview);
        mSwitchOnTextView = itemView.findViewById(R.id.switch_on_textview);
        mLightNameTextView = itemView.findViewById(R.id.light_name_text_view);

    }

    public void populateItemView(final Light lightData, final LightItemClickListener onLightClickListener, MainActivity mMainActivity) {
        mContext =mMainActivity.getApplicationContext();

        switchClick(lightData,onLightClickListener);
        seekBarChangeValue(lightData,onLightClickListener);
    }
    public SeekBar getmSeekBar() {
        return mSeekBar;
    }
    public TextView getmSwitchOnTextView() {
        return mSwitchOnTextView;
    }

    public TextView getmSwitchOffTextView() {
        return mSwitchOffTextView;
    }

    public TextView getmLightNameTextView() {
        return mLightNameTextView;
    }
    public Switch getmSwitch() {
        return mSwitch;
    }

    public void switchClick(final Light light, final LightItemClickListener onLightClickListener) {
        mSwitch.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                if(mSwitch.isChecked())
                {

                    mSwitchOffTextView.setVisibility(View.GONE);
                    mSwitchOnTextView.setVisibility(View.VISIBLE);


                } else {
                    mSwitchOnTextView.setVisibility(View.GONE);
                    mSwitchOffTextView.setVisibility(View.VISIBLE);

                }

                onLightClickListener.onSwitchClickListener(light);
            }
        });

    }

    private void seekBarChangeValue(final Light light, final LightItemClickListener onLightClickListener) {


        mSeekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
            @Override
            public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
                Log.d("test","changed");
            }

            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {
                Log.d("test","start");
            }

            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {


                onLightClickListener.onSeekBarStopListener(light);
            }
        });

    }
}

提前致谢。

Answer 1

将它添加到 recyclerview 适配器，你应该没问题

 @Override
public int getItemViewType(int position) {
    return position;
}

Answer 2

这是因为在您的 checkedChange 监听器和 seekbar 监听器上，您没有改变 Light 对象的状态。为此，当您的视图被回收时，它们会获取旧数据，因此您会出现这种奇怪的行为你应该写

light.setLightIsActivated(mSwitch.isChecked())

在您的 checkedChange 侦听器中。

Answer 3

在您创建一个可记住已更改项目的列表之前，一切都不会按预期进行。

我可能会 post 稍后举个例子。但是以这种方式思考你是否可以拥有将点击项目存储为是或否的数据列表。然后 Recyclerview 将从列表中获取项目并记住位置。

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