TimePicker自定义布局，出现空指针异常

[shaoguanglin]

java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.LinearLayout.setBackgroundColor(int)' on a null object reference
at com.bigkoo.pickerview.view.TimePickerView.initView(TimePickerView.java:80)
at com.bigkoo.pickerview.view.TimePickerView.(TimePickerView.java:34)
at com.bigkoo.pickerview.builder.TimePickerBuilder.build(TimePickerBuilder.java:312)

设置的代码如下：
pvTime=new TimePickerBuilder(getActivity(), new OnTimeSelectListener() {
@OverRide
public void onTimeSelect(Date date, View v) {
onTimeSet(date);
}

    }).setOutSideCancelable(true)//点击屏幕，点在控件外部范围时，是否取消显示
            .isCyclic(false)//是否循环滚动
            .setTextColorCenter(Color.BLACK)
            .setContentTextSize(16)
            .setType(new boolean[]{true,true,true,true,true,false})
            .setRangDate(startDate,endDate)//起始终止年月日设定
            .setLabel("","","","","","")//默认设置为年月日时分秒
            .isCenterLabel(false) //是否只显示中间选中项的label文字，false则每项item全部都带有label。
            .isDialog(false)//是否显示为对话框样式
            .setDecorView(mContainer)//getContanir()
            .setLayoutRes(R.layout.pickerview_custom_time, new CustomListener() {
                @Override
                public void customLayout(View v) {
                    TextView tv_cancle=v.findViewById(R.id.iv_cancel);
                    TextView tv_ok=v.findViewById(R.id.tv_finish);
                    tv_cancle.setOnClickListener(new View.OnClickListener() {
                        @Override
                        public void onClick(View v) {
                            pvTime.dismiss();

                        }
                    });
                    tv_ok.setOnClickListener(new View.OnClickListener() {
                        @Override
                        public void onClick(View v) {
                            pvTime.returnData();
                            pvTime.dismiss();
                        }
                    });
                }
            }).build();