如何获取用户选中的所有复选框

Question

我有一个带有复选框的列表视图。

以下是我的getView方法，

@Override
    public View getView(int position, View convertView, ViewGroup parent) {
        view = convertView;

        if (convertView == null) {
            //inflate the view for each row of listview
            view = layoutInflater.inflate(R.layout.rating_item, null);
            mViewHolder = new ViewHolder();

            mViewHolder.mstatus = (TextView) view.findViewById(R.id.ratingStatus);
            mViewHolder.mCheckBox = (CheckBox) view.findViewById(R.id.checkBox);
            view.setTag(mViewHolder);
        } else {
            mViewHolder = (ViewHolder) view.getTag();
        }

        if (StarListHolder.getInstance().getStarOne().toString() != null) {

            String starTest = String.valueOf(listForView.get(position));
            ArrayList<String> starOne = StarListHolder.getInstance().getStarOne();
            List<String> starList = StarTest.getInstance().getStarList();
            mViewHolder.mstatus.setText(starList.get(position));
        }
        return view;
    }}

我如何知道用户选中的复选框数量。

Answer 1

我猜你会想用这些数据做一些事情并在列表上反映变化。以下是步骤：

1) 在您的适配器中创建一个接口。

interface OnListFragmentInteractionListener {
    void onListFragmentInteraction(String strSelectedItemName, int intPosition);
}

2) 在onBindViewHolder 方法或getView 方法内的整行/复选框上应用点击侦听器，具体取决于您分别使用的是RecyclerView 还是BaseAdapter。

holder.Row.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            if (null != mListener) {
                // Notify the active callbacks interface (the activity, if the
                // fragment is attached to one) that an item has been selected.
                mListener.onListFragmentInteraction(holder. strSelectedItemName, intPosition);
            }
        }
    });

3) 在您的 Activity 中实现接口并通知适配器 List 中发生了更改。

@Override
public void onListFragmentInteraction(String strSelectedItemName, int intPosition) {
    if(lsSelection == null)
        lsSelection = new ArrayList<>();
    if(lsSelection.contains(strSelectedItemName)) {
        lsSelectedAreas.remove(strSelectedItemName);
        recyclerViewAdapter.getSelection().remove(strSelectedItemName);
        recyclerViewAdapter.getSelection().put(strSelectedItemName, false);
        recyclerViewAdapter.notifyItemChanged(intPosition);
    } else {
        lsSelectedAreas.add(strSelectedItemName);
        recyclerViewAdapter.getSelection().remove(strSelectedItemName);
        recyclerViewAdapter.getSelection().put(strSelectedItemName, true);
        recyclerViewAdapter.notifyItemChanged(intPosition);
    }
}

这将触发行刷新。要处理 UI 以反映此用户交互，请在您的 getView 或 onBindViewHolder 方法中插入此条件

//Show selected / unselected checkbox based on isSelected Value
//hmSelection is the HashMap that maintains the list of items selected in the adapter. 
    if((hmSelection.containsKey(holder.strSelectedItemName) && hmSelection.get(holder.strSelectedItemName))
            || lsSelectedList != null && lsSelectedList.contains(holder.strSelectedItemName)) {
        if(!hmSelection.containsKey(holder.strSelectedItemName))
            hmSelection.put(holder.strSelectedItemName, true);
        holder.cbCheckBox.setImageResource(R.drawable.checkedtick_checkbox);
    } else {
        if(!hmSelection.containsKey(holder.strSelectedItemName))
            hmSelection.put(holder.strSelectedItemName, false);
        holder.cbCheckBox.setImageResource(R.drawable.ic_checkbox_unselected);
    }

完成所有操作后，只需返回 List<String> lsSelectedItems 即可获得最终选择。

注意：由于我使用的是自定义设计的复选框，因此我使用 ImageView 代替复选框并将点击事件应用于整行。

Answer 2

//On your Activity or fragment Class
btn.setOnClickListener(new OnClickListener() {

            @Override
            public void onClick(View v) {   



int count = listView.getAdapter().getCount();
            LinearLayout ll=(LinearLayout)v.findViewById(R.id.ll1);

            for (int i = 0; i < count; i++) {

                ll = (LinearLayout) gridView.getChildAt(i);

                CheckBox cb = (CheckBox)ll.findViewById(R.id.checkbox1);
                TextView tv = (TextView)ll.findViewById(R.id.textView1);
                //  StringBuilder stringBuilder=new StringBuilder();
                if (cb.isChecked()) {

                    Log.e("CheckBoxch", "" + cb.getTag().toString());
                    Log.e("text", "" + tv.getTag().toString());
                    stringBuilder.append(tv.getTag().toString() + ",");
                    type_of_truck_appended = stringBuilder.toString();
                    if (pwindowforTruckName.isShowing()) {
                        pwindowforTruckName.dismiss();
                    }


                }
            } 
}

Answer 3

像这样试试。

在您的适配器中全局定义它。

private static int checkBoxCounter = 0;

mViewHolder.mCheckBox.setOnCheckedChangeListener(new OnCheckedChangeListener() {
    @Override
    public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
        if(isChecked && checkBoxCounter>=2){
            list.get(position).setChecked(false);
            mViewHolder.mCheckBox.setChecked(false);

        }else {
            if (isChecked) {
                starOne.add((Integer) mViewHolder.mCheckBox.getTag());
                checkBoxCounter++;              
            } else {
                checkBoxCounter--;
            }
            cCheckedItems.setText(checkBoxCounter); //<-- ADD THIS
            Toast.makeText(context, "there are " + checkBoxCounter + " items selected", Toast.LENGTH_LONG).show();
        }}});

希望这能帮助您解决问题。

Answer 4

//add a int to you adapter class
int count = 0;

//add listener to getView()
mViewHolder.mCheckBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
        @Override
        public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
            if (isChecked) {
                count++;
            } else {
                count--;
            }
        }
    });

Answer 5

//Create a modal class
mSparseBooleanArray = new SparseBooleanArray();

@Override
    public View getView(int position, View convertView, ViewGroup parent) {
        view = convertView;

        if (convertView == null) {
            //inflate the view for each row of listview
            view = layoutInflater.inflate(R.layout.rating_item, null);
            mViewHolder = new ViewHolder();

            mViewHolder.mstatus = (TextView) view.findViewById(R.id.ratingStatus);
            mViewHolder.mCheckBox = (CheckBox) view.findViewById(R.id.checkBox);
            view.setTag(mViewHolder);
        } else {
            mViewHolder = (ViewHolder) view.getTag();
        }

        if (StarListHolder.getInstance().getStarOne().toString() != null) {
mViewHolder.mCheckBox.setTag(position);
            String starTest = String.valueOf(listForView.get(position));
            ArrayList<String> starOne = StarListHolder.getInstance().getStarOne();
            List<String> starList = StarTest.getInstance().getStarList();
            mViewHolder.mstatus.setText(starList.get(position));

            mViewHolder.mstatus.setOnCheckedChangeListener(new CheckchangeListener(data,mCheckBox));
        }
        return view;
    }

    //get all checked items by calling this method

    public ArrayList<String> getCheckedItems() {
        ArrayList<String> mTempArry = new ArrayList<String>();

        for (int i = 0; i < listForView.size(); i++) {
            if (mSparseBooleanArray.get(i)) {

                String data = listForView.get(i);

                mTempArry.add(data);
            }
        }

        return mTempArry;
    }
    class CheckchangeListener implements OnCheckedChangeListener {
        private int position;

        public CheckchangeListener(int position) {
            // TODO Auto-generated constructor stub

            this.position= position;

        }

        @Override
        public void onCheckedChanged(CompoundButton buttonView,
                boolean isChecked) {
            if (isChecked) {
                checkbox
                        .setButtonDrawable(R.drawable.notification_selected_checkbox);

            } else {
                checkbox
                        .setButtonDrawable(R.drawable.notification_checkbox);

            }
            buttonView.setChecked(isChecked);

            mSparseBooleanArray.put((Integer) buttonView.getTag(), isChecked);

        }
    }
    }