Android Open Source - screenstandby Time Picker

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License

The source code is released under:

GNU General Public License

Java Source Code

/*******************************************************************************
 * Copyright (c) 2014 Hoang Nguyen.//ww w  .j  av a2 s . c  o  m
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the GNU Public License v2.0
 * which accompanies this distribution, and is available at
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 * 
 * Contributors:
 *     Hoang Nguyen - initial API and implementation
 ******************************************************************************/
package com.nkahoang.screenstandby;


// import android.annotation.Widget;
import android.content.Context;
import android.os.Parcel;
import android.os.Parcelable;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.widget.FrameLayout;
/**
 * A view for selecting the time of day, in either 24 hour or AM/PM mode.
 *
 * The hour, each minute digit, and AM/PM (if applicable) can be conrolled by
 * vertical spinners.
 *
 * The hour can be entered by keyboard input.  Entering in two digit hours
 * can be accomplished by hitting two digits within a timeout of about a
 * second (e.g. '1' then '2' to select 12).
 *
 * The minutes can be entered by entering single digits.
 *
 * Under AM/PM mode, the user can hit 'a', 'A", 'p' or 'P' to pick.
 *
 * For a dialog using this view, see {@link android.app.TimePickerDialog}.
 */
// @Widget
public class TimePicker extends FrameLayout {
    
    /**
     * A no-op callback used in the constructor to avoid null checks
     * later in the code.
     */
    private static final OnTimeChangedListener NO_OP_CHANGE_LISTENER = new OnTimeChangedListener() {
        public void onTimeChanged(TimePicker view, int hourOfDay, int minute, int second) {
        }
    };
    
    // state
    private int mCurrentHour = 0; // 0-
    private int mCurrentMinute = 0; // 0-59
    private int mCurrentSecond = 0; // 0-59

    // ui components
    private final NumberPicker mHourPicker;
    private final NumberPicker mMinutePicker;
    private final NumberPicker mSecondPicker;
    
    // callbacks
    private OnTimeChangedListener mOnTimeChangedListener;

    /**
     * The callback interface used to indicate the time has been adjusted.
     */
    public interface OnTimeChangedListener {

        /**
         * @param view The view associated with this listener.
         * @param hour The current hour.
         * @param minute The current minute.
         * @param second The current second.
         */
        void onTimeChanged(TimePicker view, int hour, int minute, int second);
    }

    public TimePicker(Context context) {
        this(context, null);
    }
    
    public TimePicker(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public TimePicker(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);

        LayoutInflater inflater =
                (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        inflater.inflate(R.layout.time_picker,
            this, // we are the parent
            true);

        // digits of hour
        mHourPicker = (NumberPicker) findViewById(R.id.hour);
        mHourPicker.setRange(0, 99);
        mHourPicker.setSpeed(100);
        mHourPicker.setFormatter(NumberPicker.TWO_DIGIT_FORMATTER);
        mHourPicker.setOnChangeListener(new NumberPicker.OnChangedListener() {
            public void onChanged(NumberPicker spinner, int oldVal, int newVal) {
                mCurrentHour = newVal;
                onTimeChanged();
            }
        });

        // digits of minute
        mMinutePicker = (NumberPicker) findViewById(R.id.minute);
        mMinutePicker.setRange(0, 59);
        mMinutePicker.setSpeed(100);
        mMinutePicker.setFormatter(NumberPicker.TWO_DIGIT_FORMATTER);
        mMinutePicker.setOnChangeListener(new NumberPicker.OnChangedListener() {
            public void onChanged(NumberPicker spinner, int oldVal, int newVal) {
                mCurrentMinute = newVal;
                onTimeChanged();
            }
        });

        // digits of second
        mSecondPicker = (NumberPicker) findViewById(R.id.second);
        mSecondPicker.setRange(0, 59);
        mSecondPicker.setSpeed(100);
        mSecondPicker.setFormatter(NumberPicker.TWO_DIGIT_FORMATTER);
        mSecondPicker.setOnChangeListener(new NumberPicker.OnChangedListener() {
            public void onChanged(NumberPicker spinner, int oldVal, int newVal) {
                mCurrentSecond = newVal;
                onTimeChanged();
            }
        });

        // initialize to current time
        setOnTimeChangedListener(NO_OP_CHANGE_LISTENER);
        
        setCurrentHour(mCurrentHour);
        setCurrentMinute(mCurrentMinute);
        setCurrentSecond(mCurrentSecond);
        
        if (!isEnabled()) {
            setEnabled(false);
        }
    }
    
    @Override
    public void setEnabled(boolean enabled) {
        super.setEnabled(enabled);
        mHourPicker.setEnabled(enabled);
        mMinutePicker.setEnabled(enabled);
        mSecondPicker.setEnabled(enabled);
    }

    /**
     * Used to save / restore state of time picker
     */
    private static class SavedState extends BaseSavedState {

        private final int mHour;
        private final int mMinute;
        private final int mSecond;

        private SavedState(Parcelable superState, int hour, int minute, int second) {
            super(superState);
            mHour = hour;
            mMinute = minute;
            mSecond = second;
        }
        
        private SavedState(Parcel in) {
            super(in);
            mHour = in.readInt();
            mMinute = in.readInt();
            mSecond = in.readInt();
        }

        public int getHour() {
            return mHour;
        }

        public int getMinute() {
            return mMinute;
        }

        public int getSecond() {
            return mSecond;
        }

        @Override
        public void writeToParcel(Parcel dest, int flags) {
            super.writeToParcel(dest, flags);
            dest.writeInt(mHour);
            dest.writeInt(mMinute);
            dest.writeInt(mSecond);
        }
    }

    @Override
    protected Parcelable onSaveInstanceState() {
        Parcelable superState = super.onSaveInstanceState();
        return new SavedState(superState, mCurrentHour, mCurrentMinute, mCurrentSecond);
    }

    @Override
    protected void onRestoreInstanceState(Parcelable state) {
        SavedState ss = (SavedState) state;
        super.onRestoreInstanceState(ss.getSuperState());
        setCurrentHour(ss.getHour());
        setCurrentMinute(ss.getMinute());
        setCurrentSecond(ss.getSecond());
    }

    /**
     * Set the callback that indicates the time has been adjusted by the user.
     * @param onTimeChangedListener the callback, should not be null.
     */
    public void setOnTimeChangedListener(OnTimeChangedListener onTimeChangedListener) {
        mOnTimeChangedListener = onTimeChangedListener;
    }

    /**
     * @return The current hour (0-).
     */
    public Integer getCurrentHour() {
        return mCurrentHour;
    }

    /**
     * Set the current hour.
     */
    public void setCurrentHour(Integer currentHour) {
        this.mCurrentHour = currentHour;
        updateHourDisplay();
    }

    /**
     * @return The current minute.
     */
    public Integer getCurrentMinute() {
        return mCurrentMinute;
    }

    /**
     * Set the current minute (0-59).
     */
    public void setCurrentMinute(Integer currentMinute) {
        this.mCurrentMinute = currentMinute;
        updateMinuteDisplay();
    }

    /**
     * @return The current second.
     */
    public Integer getCurrentSecond() {
        return mCurrentSecond;
    }

    /**
     * Set the current second (0-59).
     */
    public void setCurrentSecond(Integer currentSecond) {
        this.mCurrentSecond = currentSecond;
        updateSecondDisplay();
    }

    @Override
    public int getBaseline() {
        return mHourPicker.getBaseline(); 
    }

    /**
     * Set the state of the spinners appropriate to the current hour.
     */
    private void updateHourDisplay() {
        int currentHour = mCurrentHour;
        mHourPicker.setCurrent(currentHour);
        onTimeChanged();
    }

    private void onTimeChanged() {
        mOnTimeChangedListener.onTimeChanged(this, getCurrentHour(), getCurrentMinute(), getCurrentSecond());
    }

    /**
     * Set the state of the spinners appropriate to the current minute.
     */
    private void updateMinuteDisplay() {
        mMinutePicker.setCurrent(mCurrentMinute);
        mOnTimeChangedListener.onTimeChanged(this, getCurrentHour(), getCurrentMinute(), getCurrentSecond());
    }

    /**
     * Set the state of the spinners appropriate to the current second.
     */
    private void updateSecondDisplay() {
        mSecondPicker.setCurrent(mCurrentSecond);
        mOnTimeChangedListener.onTimeChanged(this, getCurrentHour(), getCurrentMinute(), getCurrentSecond());
    }
}

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