Question

我有一个RecyclerView。每行都有一个开关按钮，我点击开关改变它的状态。当我向下滚动并回来时，recyclerview忽略了我在切换时所做的更改。所有的Recyclerview都会重置。

我希望在滚动期间对recyclerview进行任何更改。

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

将此添加到recycleview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侦听器和搜索栏侦听器上，您没有改变Light对象的状态。为此，当您的视图被回收时，它们会获得旧数据，因此您会遇到这种奇怪的行为你应该写

light.setLightIsActivated(mSwitch.isChecked())

在checkChange侦听器中。

Answer 3

没有任何作品按预期工作，直到你制作一个记住更改项目的列表。

我可能稍后发布一个例子。但是想想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。

RecyclerView：在滚动期间不断更改数据

3 个答案: