Question

当我滚动recyclerView时，某些项目出现在不应该出现的位置。

我应该只有“第一个”或者只有“第二个”突然间我在视图中同时拥有“第一秒”。

编辑：最有可能重用一些观点，但我该如何检查这是否正确？

我的代码是：

    @Override
public void onBindViewHolder(MyRecyclerAdapter.ViewHolder holder, int position) {
    DiaryDay item = items.get(position);
    holder.tvDay.setText(item.getDay());
    holder.tvMonth.setText(item.getMonth());
    showSplash(holder, item);

    if (holder.tvSunBathingMins!=null) {
        holder.tvSunBathingMins.setText(String.valueOf(item.getSunBathing()) + "  mins sunbathing. ");
    }

}

private void showSplash(ViewHolder holder, DiaryDay item) {
    if ( item.getSun_1() + item.getSun_2() + item.getSun_3() + item.getSun_4()  == 4   ) {
            holder.tvSplash2.setText( "All day! Amazing!");
    } else {
        if (item.getSun_1() != 0) {
            holder.tvSplash1.setText("First ");
        }
        if (item.getSun_2() != 0) {
            holder.tvSplash2.setText("Second ");
        }
        if (item.getSun_3() != 0) {
            holder.tvSplash3.setText("Third ");
        }
        if (item.getSun_4() != 0) {
            holder.tvSplash4.setText("Fourth ");
        }
    }

}




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

最后我的ViewHolder是：

   public static class ViewHolder extends RecyclerView.ViewHolder {
    public TextView tvDay;
    public TextView tvMonth;
    public TextView tvSplash1; public TextView tvSplash2; public TextView tvSplash3; public TextView tvSplash4;
    public TextView tvSunBathingMins;
    public TextView tvSumMins;

    public ViewHolder(View itemView) {
        super(itemView);
        tvDay = (TextView) itemView.findViewById(R.id.dayID);
        tvMonth = (TextView) itemView.findViewById(R.id.monthID);
        tvSplash1 = (TextView) itemView.findViewById(R.id.sun1);
        tvSplash2 = (TextView) itemView.findViewById(R.id.sun2);
        tvSplash3 = (TextView) itemView.findViewById(R.id.sun3);
        tvSplash4 = (TextView) itemView.findViewById(R.id.sun4);
        tvSunBathingMins = (TextView) itemView.findViewById(R.id.sunbathMinsID);
        tvSumMins = (TextView) itemView.findViewById(R.id.sumMinsID);

    }
}

Answer 1

问题在于你定义if语句而没有else子句。当视图持有者被回收时，会发生这样的事情，例如tvSplash1，tvSplash2等视图仍然具有从离开屏幕的视图中分配的值。这就是您需要按如下方式重置这些项目的原因：

@Override
public void onBindViewHolder(MyRecyclerAdapter.ViewHolder holder, int position) {
    DiaryDay item = items.get(position);
    holder.tvDay.setText(item.getDay());
    holder.tvMonth.setText(item.getMonth());
    showSplash(holder, item);

    if (holder.tvSunBathingMins!=null) {
        holder.tvSunBathingMins.setText(String.valueOf(item.getSunBathing()) + "  mins sunbathing. ");
    } else {
        holder.tvSunBathingMins.setText("");
    }
}

private void showSplash(ViewHolder holder, DiaryDay item) {
    if ( item.getSun_1() + item.getSun_2() + item.getSun_3() + item.getSun_4()  == 4   ) {
            holder.tvSplash2.setText( "All day! Amazing!");
    } else {
        if (item.getSun_1() != 0) {
            holder.tvSplash1.setText("First ");
        } else {
            holder.tvSplash1.setText("");
        }

        if (item.getSun_2() != 0) {
            holder.tvSplash2.setText("Second ");
        } else {
            holder.tvSplash2.setText("");
        }
        if (item.getSun_3() != 0) {
            holder.tvSplash3.setText("Third ");
        } else {
            holder.tvSplash3.setText("");
        }
        if (item.getSun_4() != 0) {
            holder.tvSplash4.setText("Fourth ");
        } else {
            holder.tvSplash4.setText("");
        }
    }
}

RecyclerView的项目没有出现正确的位置

1 个答案: