Java中代码片段的getCurrentThreadCpuTime diff和System.nanoTime（）差异的巨大差异

Question

public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        lv = (ListView) findViewById(R.id.viewlist);
        dbHelper = new RecordsDbAdapter(this);
        dbHelper.open();
        //Add some data
//        dbHelper.insertSomeRecords();
        //Generate ListView from SQLite Database
        displayListView();
//        setContentView(R.layout.expense_entry);
            Button deleteBtn = (Button) this.findViewById(R.id.btn_delete);
            deleteBtn.setOnClickListener(new Button.OnClickListener(){

                @Override
                public void onClick(View v) {
                    //do something
                    ViewGroup parent = (ViewGroup) v.getParent();
//                    final ConstraintLayout c = this;
                    for (int itemPos = 0; itemPos < parent.getChildCount(); itemPos++) {
                        View view = parent.getChildAt(2);
                        if (view.getParent() == parent) {
                            dbHelper.deleteSingleRow(String.valueOf(view.findViewById(R.id.textViewDateTime)));
                            dataAdapter.notifyDataSetChanged();
                        }
                    }}

JVM启用了详细的GC日志切换功能，并且在上面的代码运行时没有GC日志。那么我们可以得出结论，如果实际延迟和经过的CPU时间之间存在巨大差异，那么该线程是否被操作系统抢占了？

我观察到了巨大的差异：延迟超过1秒，timeElpasedCPU只有几毫秒。