java.lang.RuntimeException: Unable to start activity ComponentInfo{com.tony.timepicker/com.tony.timepicker.MainActivity}: android.view.InflateException: Binary XML file line #11: Error inflating class com.tony.timepicker.TimePicker

package com.tony.timepicker;

import java.util.Calendar;

import android.content.Context;

import android.text.format.DateFormat;

import android.util.AttributeSet;

import android.widget.FrameLayout;

import android.widget.NumberPicker;

import android.widget.NumberPicker.OnValueChangeListener;

public class TimePicker extends FrameLayout {

    private NumberPicker mHourSpinner;

    private NumberPicker mMinuteSpinner;

    private Calendar mDate;

    private int mHour, mMinute;

    private String[] mDateDisplayValues = new String[7];

    private OnTimeChangedListener mOnTimeChangedListener;

    public TimePicker(Context context) {

        super(context);

        init(context);

    }

    public void init(Context context) {

        mDate = Calendar.getInstance();

        // android.widget.TimePicker

        mHour = mDate.get(Calendar.HOUR_OF_DAY);

        mMinute = mDate.get(Calendar.MINUTE);

        inflate(context, R.layout.time_picker, this);

        updateTimeControl();

        mHourSpinner = (NumberPicker) this.findViewById(R.id.np_hour);

        mHourSpinner.setMaxValue(23);

        mHourSpinner.setMinValue(0);

        mHourSpinner.setValue(mHour);

        mHourSpinner.setOnValueChangedListener(mOnHourChangedListener);

        mMinuteSpinner = (NumberPicker) this.findViewById(R.id.np_minute);

        mMinuteSpinner.setMaxValue(59);

        mMinuteSpinner.setMinValue(0);

        mMinuteSpinner.setValue(mMinute);

        mMinuteSpinner.setOnValueChangedListener(mOnMinuteChangedListener);

    }

    private NumberPicker.OnValueChangeListener mOnDateChangedListener = new OnValueChangeListener() {

        @Override

        public void onValueChange(NumberPicker picker, int oldVal, int newVal) {

            mDate.add(Calendar.DAY_OF_MONTH, newVal - oldVal);

            updateTimeControl();

            onTimeChanged();

        }

    };

    private NumberPicker.OnValueChangeListener mOnHourChangedListener = new OnValueChangeListener() {

        @Override

        public void onValueChange(NumberPicker picker, int oldVal, int newVal) {

            mHour = mHourSpinner.getValue();

            onTimeChanged();

        }

    };

    private NumberPicker.OnValueChangeListener mOnMinuteChangedListener = new OnValueChangeListener() {

        @Override

        public void onValueChange(NumberPicker picker, int oldVal, int newVal) {

            mMinute = mMinuteSpinner.getValue();

            onTimeChanged();

        }

    };

    private void updateTimeControl() {

        Calendar cal = Calendar.getInstance();

        cal.setTimeInMillis(mDate.getTimeInMillis());

        cal.add(Calendar.DAY_OF_YEAR, -7 / 2 - 1);

        for (int i = 0; i < 7; ++i) {

            cal.add(Calendar.DAY_OF_YEAR, 1);

            mDateDisplayValues[i] = (String) DateFormat.format("MM.dd EEEE",

                    cal);

        }

    }

    public interface OnTimeChangedListener {

        void onTimeChanged(TimePicker view, int year, int month, int day,

                int hour, int minute);

    }

    public void setOnTimeChangedListener(OnTimeChangedListener callback) {

        mOnTimeChangedListener = callback;

    }

    private void onTimeChanged() {

        if (mOnTimeChangedListener != null) {

            mOnTimeChangedListener.onTimeChanged(this,

                    mDate.get(Calendar.YEAR), mDate.get(Calendar.MONTH),

                    mDate.get(Calendar.DAY_OF_MONTH), mHour, mMinute);

        }

    }

}