RecyclerView实现购物车的全选、反选功能

实现购物车的全选、反选功能

• 定义一个HasMap集合

private HashMap<Integer, Boolean> isCheckedHasMap;

• 把CheckBox与条目关联

isCheckedHasMap = new HashMap<>();
for (int i = 0; i < mData.size(); i++) {
    isCheckedHasMap.put(i, false);
}

1. CheckBox点击事件 添加在onBindViewHolder里面(cb是CheckBox的ID)

holder.cb.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        isCheckedHasMap.put(position, !isCheckedHasMap.get(position));
        notifyDataSetChanged();
    }
});
holder.cb.setChecked(isCheckedHasMap.get(position));

• 全选功能

public void selectedAll() {
    Set<Map.Entry<Integer, Boolean>> entries = isCheckedHasMap.entrySet();
    boolean shouldSelectedAll = false;
    for (Map.Entry<Integer, Boolean> entryset : entries) {
        Boolean aBoolean = entryset.getValue();
        if (!aBoolean) {
            shouldSelectedAll = true;
            break;
        }
    }
    for (Map.Entry<Integer, Boolean> entryset : entries) {
        entryset.setValue(shouldSelectedAll);
    }
    notifyDataSetChanged();
}

• 反选功能

public void revertSelected() {
    Set<Map.Entry<Integer, Boolean>> entries = isCheckedHasMap.entrySet();
    for (Map.Entry<Integer, Boolean> entryset : entries) {
        entryset.setValue(!entryset.getValue());
    }
    notifyDataSetChanged();
}