android - getCheckedItemPositions 总是返回 false

Question

我正在使用此处链接中的源代码

从上面的来源，我尝试选择选中的项目并从列表中删除。

在布局中添加删除按钮：

  <Button
    android:id="@+id/button1"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:text="Delete" />

将选择模式设置为 multichoice ：

adapter = new MyAdapter(this,getModel());
    listView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
    listView.setAdapter(adapter);
    listView.setOnItemClickListener(this);
    del_btn.setOnClickListener(new OnClickListener() {

        @Override
        public void onClick(View arg0) {
            // TODO Auto-generated method stub
            DeleteSelecteditems();
        }
    });

这是 DeleteSelecteditems 方法：

DeleteSelecteditems(){
int len = listView.getCount();
SparseBooleanArray checked = listView.getCheckedItemPositions();

Log.d("DeleteSelecteditems","no of checked item:"+checked.size());
    for (int i = 0; i < checked.size(); i++){
        //item position in adapter
        int pos= checked.keyAt(i);
        Log.d("DeleteSelecteditems","pos: "+pos);
        boolean valueat = checked.valueAt(i);
        boolean get = checked.get(i);
        Log.d("DeleteSelecteditems","get: "+get+" valueat:"+valueat);
        if (checked.valueAt(i)) {

            Model item = adapter.getItem(pos);//list.get(i);

            adapter.remove(item);
            adapter.notifyDataSetChanged();

        }

}

获取视图（）

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

    ViewHolder viewHolder = null;
    if (convertView == null) {
        LayoutInflater inflator = context.getLayoutInflater();
        convertView = inflator.inflate(R.layout.row, null);
        viewHolder = new ViewHolder();
        viewHolder.text = (TextView) convertView.findViewById(R.id.label);
        viewHolder.checkbox = (CheckBox) convertView.findViewById(R.id.check);
        viewHolder.checkbox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {

            @Override
            public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) {
                int getPosition = (Integer) buttonView.getTag();  // Here we get the position that we have set for the checkbox using setTag.
                list.get(getPosition).setSelected(buttonView.isChecked()); // Set the value of checkbox to maintain its state.
            }
        });
        convertView.setTag(viewHolder);
        convertView.setTag(R.id.label, viewHolder.text);
        convertView.setTag(R.id.check, viewHolder.checkbox);
        } else {
        viewHolder = (ViewHolder) convertView.getTag();
    }
    viewHolder.checkbox.setTag(position); // This line is important.

    viewHolder.text.setText(list.get(position).getName());
    viewHolder.checkbox.setChecked(list.get(position).isSelected());

    return convertView;
}
}

检查的数组总是有 13 个项目，所有的值都是假的。为什么？

Answer 1

SparseBooleanArray sarray = mMyAdapter.getarray();
    int size =sarray .size();
for(int i=0;i<size;i++)
     {
     int pos= sarray.keyAt(i);
     boolean valueat = sarray.valueAt(i);
     boolean get = sarray.get(i);
    if(valueat )
    {
        Model itemadpter= mMyAdapter.getItem(pos);

    }
}

Answer 2

利用：

SparseBooleanArray arraySparse = myGridView.getcheckeditempositions();

for(int i=0;i<arraySparse.size();i++){
//Shows values boolean of keys 
     Log.d("MI_APP",""+arraySparce.valueAt(i));
//Shows keys id or position of your element in the GridView
     Log.d("MI_APP",""+arraySparce.keyAt(i));
}

问候！