如何从android中的recyclerView中删除项目

Question

在我的应用程序中,我应该使用recyclerView并删除一些项目.
我想从中删除一些项目recyclerview,为此我在下面的代码中编写适配器:

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

    private Context context;
    private List<TvTonightResult> model;

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

    @Override
    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.row_tv_tonight, parent, false);

        return new ViewHolder(view);
    }

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

        holder.tvTonightTitle.setText(Html.fromHtml(model.get(position).getName()));
        Glide.with(context)
                .load(model.get(position).getImageUrl())
                .placeholder(R.drawable.default_image)
                .override(600, 900)
                .diskCacheStrategy(DiskCacheStrategy.ALL)
                .listener(new RequestListener<String, GlideDrawable>() {
                    @Override
                    public boolean onException(Exception e, String model, Target<GlideDrawable> target, boolean isFirstResource) {
                        return false;
                    }

                    @Override
                    public boolean onResourceReady(GlideDrawable resource, String model,
                                                   Target<GlideDrawable> target, boolean isFromMemoryCache, boolean isFirstResource) {
                        return false;
                    }
                })
                .into(holder.tvTonightImage);

        long time = 5 * 1000;
        holder.tvTonightTimeCounter.start(time);
        holder.tvTonightTimeCounter.setOnCountdownEndListener(new CountdownView.OnCountdownEndListener() {
            @Override
            public void onEnd(CountdownView cv) {
                removeItem(position);
            }
        });
    }

    @Override
    public int getItemCount() {
        return 4;
    }

    public class ViewHolder extends RecyclerView.ViewHolder {

        private ImageView tvTonightImage, tvTonightChannel;
        private TextView tvTonightTitle, tvTonightDate;
        private CountdownView tvTonightTimeCounter;

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

            tvTonightImage = (ImageView) itemView.findViewById(R.id.row_tvTonightImage);
            tvTonightChannel = (ImageView) itemView.findViewById(R.id.row_tvTonightChannelImage);
            tvTonightTitle = (TextView) itemView.findViewById(R.id.row_tvTonightTitle);
            tvTonightTimeCounter = (CountdownView) itemView.findViewById(R.id.row_tvTonightTime);

        }
    }

    private void removeItem(int position) {
        model.remove(position);
        notifyItemRemoved(position);
        notifyItemRangeChanged(position, model.size());
    }
}

我想在运行此代码时删除项目:

holder.tvTonightTimeCounter.setOnCountdownEndListener(new CountdownView.OnCountdownEndListener() {
                @Override
                public void onEnd(CountdownView cv) {
                    removeItem(position);
                }
            });

但是告诉我这个错误:

FATAL EXCEPTION: main
Process: com.example.app, PID: 9711
java.lang.IndexOutOfBoundsException: Index: 2, Size: 2
    at java.util.ArrayList.remove(ArrayList.java:477)
    at com.example.app.Adapters.TvTonightAdapter.removeItem(TvTonightAdapter.java:102)
    at com.example.app.Adapters.TvTonightAdapter.access$300(MyAdapter.java:29)
    at com.example.app.Adapters.TvTonightAdapter$2.onEnd(MyAdapter.java:74)
    at com.example.app.Utils.Componenets.CountDownTimer.CountdownView$1.onFinish(CountdownView.java:129)
    at com.example.app.Utils.Componenets.CountDownTimer.CustomCountDownTimer$1.handleMessage(CustomCountDownTimer.java:74)
    at android.os.Handler.dispatchMessage(Handler.java:102)
    at android.os.Looper.loop(Looper.java:154)
    at android.app.ActivityThread.main(ActivityThread.java:6247)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:872)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:762)

如何修复此错误并从中删除项目recyclerview？

Answer 1

试一试 ,

int newPosition = holder.getAdapterPosition();

在您的removeItem()方法和newPosition的repalce位置.

喜欢 ,

  private void removeItem(int position) {
    int newPosition = holder.getAdapterPosition();
    model.remove(newPosition);
    notifyItemRemoved(newPosition);
    notifyItemRangeChanged(newPosition, model.size());
}

Answer 2

我认为你应该打电话remove(holder.getAdapterPosition())而不是remove(position)因为,当持有人的倒计时结束时,它可能已经改变了它的位置.

假设以下情况:

1º持有者 - > 5秒倒计时

2º持有者 - > 10秒倒计时

由于第二个支架在第一个支架完成后,在10秒之后完成 remove(1),因为第一个支架已经被移除,因此,第二个支架的位置将为0.因此,应该调用remove(0)而不是remove(1)(这将导致一个IndexOutOfBoundsException).