Android Open Source - ExpertAndroid Duration Control

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The source code is released under:
MIT License
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Java Source Code

package com.iuriio.demos.expertandroid.ch2durationcontrol;
//w  w w.  j  a v a  2 s.com
import android.app.Activity;
import android.app.DialogFragment;
import android.app.FragmentManager;
import android.content.Context;
import android.content.res.TypedArray;
import android.os.Parcel;
import android.os.Parcelable;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.TextView;

import java.text.SimpleDateFormat;
import java.util.Calendar;

public class DurationControl extends LinearLayout implements View.OnClickListener {
    private Button fromButton;
    private Button toButton;

    private Calendar fromDate;
    private Calendar toDate;
    private int durationUnits;

    public DurationControl(Context context) {
        super(context);
        this.initialize(context);
    }

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

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

        TypedArray t = context.obtainStyledAttributes(attrs, R.styleable.DurationControl, defStyle, 0);
        this.durationUnits = t.getInt(R.styleable.DurationControl_durationUnits, this.durationUnits);
        t.recycle();

        this.initialize(context);
    }

    private void initialize(Context context) {
        LayoutInflater inflater = LayoutInflater.from(context);
        inflater.inflate(R.layout.duration_view_layout, this);

        // Load controls.
        this.fromButton = (Button) this.findViewById(R.id.fromButton);
        this.fromButton.setOnClickListener(this);
        this.toButton = (Button) this.findViewById(R.id.toButton);
        this.toButton.setOnClickListener(this);

        // Enable state saving.
        this.setSaveEnabled(true);
    }

    private FragmentManager getFragmentManager() {
        final Context context = this.getContext();
        if (context instanceof Activity) {
            return ((Activity) context).getFragmentManager();
        }

        throw new RuntimeException("Activity context expected instead");
    }

    /**
     * Called when a view has been clicked.
     *
     * @param v The view that was clicked.
     */
    @Override
    public void onClick(View v) {
        DialogFragment newFragment = null;
        switch (v.getId()) {
            case R.id.fromButton:
                newFragment = new DatePickerFragment(this, R.id.fromButton);
                newFragment.show(this.getFragmentManager(), "com.iuriio.demos.tags.datePicker");
                break;
            case R.id.toButton:
                newFragment = new DatePickerFragment(this, R.id.toButton);
                newFragment.show(this.getFragmentManager(), "com.iuriio.demos.tags.datePicker");
                break;
        }
    }

    public void onDateSet(int buttonId, int year, int monthOfYear, int dayOfMonth) {
        final Calendar calendar = this.getDate(year, monthOfYear, dayOfMonth);
        switch (buttonId) {
            case R.id.fromButton:
                this.setFromDate(calendar);
                break;
            case R.id.toButton:
                this.setToDate(calendar);
                break;
        }
    }

    private void setToDate(Calendar calendar) {
        if (calendar == null) {
            return;
        }

        this.toDate = calendar;
        TextView toText = (TextView) this.findViewById(R.id.toDate);
        toText.setText(this.getDateString(calendar));
    }

    private void setFromDate(Calendar calendar) {
        if (calendar == null) {
            return;
        }

        this.fromDate = calendar;
        TextView fromText = (TextView) this.findViewById(R.id.fromDate);
        fromText.setText(this.getDateString(calendar));
    }

    private String getDateString(Calendar calendar) {
        if (calendar == null) {
            return "null";
        }

        final SimpleDateFormat format = new SimpleDateFormat("MM/dd/yyyy");
        format.setLenient(false);
        String result = format.format(calendar.getTime());
        return result;
    }

    private Calendar getDate(int year, int month, int day) {
        final Calendar calendar = Calendar.getInstance();
        calendar.set(year, month, day);
        return calendar;
    }

    /**
     * Hook allowing a view to re-apply a representation of its internal state that had previously
     * been generated by {@link #onSaveInstanceState}. This function will never be called with a
     * null state.
     *
     * @param state The frozen state that had previously been returned by
     *              {@link #onSaveInstanceState}.
     * @see #onSaveInstanceState()
     * @see #restoreHierarchyState(android.util.SparseArray)
     * @see #dispatchRestoreInstanceState(android.util.SparseArray)
     */
    @Override
    protected void onRestoreInstanceState(Parcelable state) {
        if (!(state instanceof SavedState)) {
            super.onRestoreInstanceState(state);
            return;
        }

        SavedState ss = (SavedState) state;
        super.onRestoreInstanceState(ss.getSuperState());
        this.setFromDate(ss.fromDate);
        this.setToDate(ss.toDate);
    }

    /**
     * Hook allowing a view to generate a representation of its internal state
     * that can later be used to create a new instance with that same state.
     * This state should only contain information that is not persistent or can
     * not be reconstructed later. For example, you will never store your
     * current position on screen because that will be computed again when a
     * new instance of the view is placed in its view hierarchy.
     * <p/>
     * Some examples of things you may store here: the current cursor position
     * in a text view (but usually not the text itself since that is stored in a
     * content provider or other persistent storage), the currently selected
     * item in a list view.
     *
     * @return Returns a Parcelable object containing the view's current dynamic
     * state, or null if there is nothing interesting to save. The
     * default implementation returns null.
     * @see #onRestoreInstanceState(android.os.Parcelable)
     * @see #saveHierarchyState(android.util.SparseArray)
     * @see #dispatchSaveInstanceState(android.util.SparseArray)
     * @see #setSaveEnabled(boolean)
     */
    @Override
    protected Parcelable onSaveInstanceState() {
        Parcelable superState = super.onSaveInstanceState();
        return new SavedState(superState, this.fromDate, this.toDate);
    }

    public static class SavedState extends BaseSavedState {
        public static final Parcelable.Creator<SavedState> CREATOR = new Parcelable.Creator<SavedState>() {

            /**
             * Create a new instance of the Parcelable class, instantiating it
             * from the given Parcel whose data had previously been written by
             * {@link android.os.Parcelable#writeToParcel Parcelable.writeToParcel()}.
             *
             * @param source The Parcel to read the object's data from.
             * @return Returns a new instance of the Parcelable class.
             */
            @Override
            public SavedState createFromParcel(Parcel source) {
                return new SavedState(source);
            }

            /**
             * Create a new array of the Parcelable class.
             *
             * @param size Size of the array.
             * @return Returns an array of the Parcelable class, with every entry
             * initialized to null.
             */
            @Override
            public SavedState[] newArray(int size) {
                return new SavedState[size];
            }
        };

        private Calendar fromDate;
        private Calendar toDate;

        /**
         * Constructor called by derived classes when creating their SavedState objects
         *
         * @param superState The state of the superclass of this view
         */
        public SavedState(Parcelable superState) {
            super(superState);
        }

        public SavedState(Parcelable superState, Calendar fromDate, Calendar toDate) {
            super(superState);
            this.fromDate = fromDate;
            this.toDate = toDate;
        }

        /**
         * Constructor used when reading from a parcel. Reads the state of the superclass.
         *
         * @param source Source to restore saved state from.
         */
        public SavedState(Parcel source) {
            super(source);

            long fromDateValue = source.readLong();
            if (fromDateValue == -1) {
                this.fromDate = null;
            } else {
                this.fromDate = Calendar.getInstance();
                this.fromDate.setTimeInMillis(fromDateValue);
            }

            long toDateValue = source.readLong();
            if (toDateValue == -1) {
                this.toDate = null;
            } else {
                this.toDate = Calendar.getInstance();
                this.toDate.setTimeInMillis(toDateValue);
            }
        }

        @Override
        public void writeToParcel(Parcel dest, int flags) {
            super.writeToParcel(dest, flags);

            if (this.fromDate != null) {
                dest.writeLong(this.fromDate.getTimeInMillis());
            } else {
                dest.writeLong(-1L);
            }

            if (this.toDate != null) {
                dest.writeLong(this.toDate.getTimeInMillis());
            } else {
                dest.writeLong(-1L);
            }
        }
    }
}
Java Source Code List
