＆＃39; boolean android.util.SparseBooleanArray.get（int）＆＃39;在null对象引用上

Question

我正在尝试删除所选的已检查项目但是从代码中收到此错误。请帮忙。

                submit.setOnClickListener(new View.OnClickListener() {  //set action after clicking submit
                @Override
                public void onClick(View view) {        //delete checked items and refresh
                    SparseBooleanArray checkedItemPositions = lview.getCheckedItemPositions();
                    int itemCount = lview.getCount();

                    for(int i=itemCount-1; i >= 0; i--){
                        if(checkedItemPositions.get(i)){
                            adapter.remove(hangerlist.get(i));
                        }
                    }
                    checkedItemPositions.clear();
                    adapter.notifyDataSetChanged();
                    for (int i = 0; i < lview.getChildCount(); i++) {        //remove checkbox after deleting
                        lview.getChildAt(i).findViewById(R.id.checkDelete).setVisibility(View.INVISIBLE);
                    }
                    btn.setVisibility(View.INVISIBLE);      //remove submit and cancel button after deleting

                }

            });

Answer 1

SparseBooleanArray checkedItemPositions = lview.getCheckedItemPositions（）;

此行返回null SparseBooleanArray。 您需要检查列表视图是否已选中项目位置＆＃39;，尝试添加断点或发布更多代码来初始化lView组件。