src/com/android/deskclock/timer/TimerFragmentAdapter.java

/*
 * Copyright (C) 2014 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.deskclock.timer;

import android.app.Fragment;
import android.app.FragmentManager;
import android.content.SharedPreferences;
import android.support.v4.view.PagerAdapter;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;

public class TimerFragmentAdapter extends FragmentStatePagerAdapter2 {

    private final ArrayList<TimerObj> mTimerList = new ArrayList<TimerObj>();
    private final SharedPreferences mSharedPrefs;

    public TimerFragmentAdapter(FragmentManager fm, SharedPreferences sharedPreferences) {
        super(fm);
        mSharedPrefs = sharedPreferences;
    }

    @Override
    public int getItemPosition(Object object) {
        // Force return NONE so that the adapter always assumes the item position has changed
        return PagerAdapter.POSITION_NONE;
    }

    @Override
    public int getCount() {
        return mTimerList.size();
    }

    @Override
    public Fragment getItem(int position) {
        return TimerItemFragment.newInstance(mTimerList.get(position));
    }

    public void addTimer(TimerObj timer) {
        // Newly created timer should always show on the top of the list
        mTimerList.add(0, timer);
        notifyDataSetChanged();
    }

    public TimerObj getTimerAt(int position) {
        return mTimerList.get(position);
    }

    public void saveTimersToSharedPrefs() {
        TimerObj.putTimersInSharedPrefs(mSharedPrefs, mTimerList);
    }

    public void populateTimersFromPref() {
        mTimerList.clear();
        TimerObj.getTimersFromSharedPrefs(mSharedPrefs, mTimerList);
        Collections.sort(mTimerList, new Comparator<TimerObj>() {
            @Override
            public int compare(TimerObj o1, TimerObj o2) {
                return (o2.mTimerId < o1.mTimerId) ? -1 : 1;
            }
        });

        notifyDataSetChanged();
    }

    public void deleteTimer(int id) {
        for (int i = 0; i < mTimerList.size(); i++) {
            TimerObj timer = mTimerList.get(i);
            if (timer.mTimerId == id) {
                if (timer.mView != null) {
                    timer.mView.stop();
                }
                timer.deleteFromSharedPref(mSharedPrefs);
                mTimerList.remove(i);
                break;
            }
        }

        notifyDataSetChanged();
        return;
    }

    // Return position of the timer with the given timerId. If the timer is not in the list,
    // return 0 so we get the position of the newest timer.
    public int getTimerPosition(int id) {
        for (int i = 0; i < mTimerList.size(); i++) {
            TimerObj timer = mTimerList.get(i);
            if (timer.mTimerId == id) {
                return i;
            }
        }
        return 0;
    }
}