选择android中listview的所有复选框

Question

我有用于列表视图,其内部包括复选框5次定制arrayadapter,在这里,我要实现的选择列表视图中所有的复选框,并取消所有复选框,我试着用getchildat()的方法oncreate(),onresume()以及onpostcreate同时,但不做出运气给我.如果你能告诉我解决方案,我很感激.

@Override
      public void onPostCreate(Bundle savedInstanceState){
          super.onPostCreate(savedInstanceState);

      Button selectall=(Button) findViewById(R.id.allselect);

      selectall.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View v) {

            int count = listview.getCount();

            System.out.println("the count is "+count);
            for (int i = 0; i < listview.getLastVisiblePosition() - listview.getFirstVisiblePosition(); i++)  {

                RelativeLayout itemLayout = (RelativeLayout)listview.getChildAt(i);
                CheckBox cb = (CheckBox)itemLayout.findViewById(R.id.chkbx);
                cb.setChecked(true);

            }

        }
    });
  }

Arrayadapter类

@SuppressWarnings("unchecked")
    public MultipleLeadSyncAdapter(Context context, String[] values,String[] values1,List<Model> qrcode ,String[] values3,String[] values4,String[] values5) {
        super(context, R.layout.multipleselectlist, values1);
        this.context = context;
        this.values = values;
        this.values1 = values1;
        this.list=qrcode;
        this.values3=values3;
        this.values4=values4;
        this.eventid=values5;
    }

@Override
public View getView(int position, View convertView, ViewGroup parent) {
    LayoutInflater inflater = (LayoutInflater) context
            .getSystemService(Context.LAYOUT_INFLATER_SERVICE); 


    ViewHolder holder =null;
    if (convertView == null) {


            convertView = inflater.inflate(R.layout.multipleselectlist, parent, false);

            holder = new ViewHolder();
            holder.textView1 = (TextView) convertView.findViewById(R.id.multileadfirst_name);

            holder.textView3 = (TextView) convertView
                    .findViewById(R.id.multileadcompany_name);

            holder.rate=(RatingBar) convertView.findViewById(R.id.multileadlistrating);

            holder.chkbox = (CheckBox) convertView.findViewById(R.id.chkbx);

            holder.chkbox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {

                @Override
                public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                    int getPosition = (Integer) buttonView.getTag();  
                    list.get(getPosition).setSelected(buttonView.isChecked()); 
                }
            });

            convertView.setTag(holder);
            convertView.setTag(R.id.chkbx,holder.chkbox);
            convertView.setTag(R.id.multileadfirst_name,holder.textView1);
            convertView.setTag(R.id.multileadcompany_name,holder.textView3);
            convertView.setTag(R.id.multileadlistrating,holder.rate);

    }else {
        holder = (ViewHolder) convertView.getTag();
    }


     holder = (ViewHolder) convertView.getTag();


    holder.textView1.setText(values[position]);

    if(values3[position].equals(" ")||values3[position].equals("null")||values3[position].equals("")){

    }else{

        String[] temp=values3[position].split(" ");

    }

    holder.textView3.setText(values1[position]);

    holder.rate.setRating(Float.valueOf(values4[position]).floatValue());

    String s = values[position];
    String ss = values1[position];

    System.out.println(s + ss );


    holder.chkbox.setTag(position);

    //holder.textView3.setText(list.get(position).getName());
    holder.chkbox.setChecked(list.get(position).isSelected());
    String igurl=values[position];
    System.out.println("the imagurl is "+igurl);

    return convertView;



}

class ViewHolder {

    String qrcode,Boothid;
    TextView textView1, textView2, textView3,textView4,textView5;
    RatingBar rate;
    ImageView imageView;
    CheckBox chkbox;

    public String getQrcode() {
        return qrcode;
    }

    public void setQrcode(String qrcode) {
        this.qrcode = qrcode;
    }

    public String getBoothID() {
        return Boothid;
    }

    public void setBoothID(String Boothid) {
        this.Boothid = Boothid;
    }

}

}

Answer 1

A ListView只是数据的表示.数据ListView由a 给出Adapter.话虽如此,我可以解释你做错了什么:

里面你OnClickListener,你是检查(UN)View的的ListView本身.这意味着数据未被更改,ListView并且表示此数据的数据不显示所需行为.

一个简单的解决方案是在你的Model-object中添加一个布尔值,表示检查状态:

Model {
   boolean isChecked = false;

   public void setChecked(boolean checked){
        isChecked = checked;
   }

   public boolean isChecked(){
        return isChecked;
   }
}

每当您单击"selectall"按钮时,您将简单地切换此布尔值,并Adapter通过该方法通知他的数据已更改notifyDataSetChanged.这将轮到他自己更新ListView.在伪代码中:

 onClick(..) {
     foreach (model inside my adapter){
         model.setChecked(true);
     }
     listview.getAdapter().notifyDataSetChanged()
 }

最后但并非最不重要的是,在你getView()内部的方法中Adapter你可以看到是否Model检查了一个并采取相应的行动.

getView(...){

   if (listOfModel.get(position).isChecked){
       // do stuff, probably check a CheckBox
   } else {
       // uncheck...
   }

祝好运!