在android6.0.1上测试发现TimePickerDialog的onTimeSet和DatePickerDialog的onDateSet不回调，查看SDK源码发现，TimePickerDialog源码中该回调的调用在下面方法中调用：

@Override
public void onClick(DialogInterface dialog, int which) {
    switch (which) {
        case BUTTON_POSITIVE:
            // Note this skips input validation and just uses the last valid time and hour
            // entry. This will only be invoked programmatically. User clicks on BUTTON_POSITIVE
            // are handled in show().
            if (mTimeSetListener != null) {
                mTimeSetListener.onTimeSet(mTimePicker, mTimePicker.getCurrentHour(),
                        mTimePicker.getCurrentMinute());
            }
            break;
        case BUTTON_NEGATIVE:
            cancel();
            break;
    }
而我在上层调用时，使用了dialog.setButton重新实现了按钮功能，导致了该问题的发生。在代码中去掉dialog.setButton的实现即可解决该问题。DatePcikerDialog同理。