src/com/android/timezonepicker/TimeZoneResultAdapter.java - platform/frameworks/opt/timezonepicker - Git at Google

 /*
  * Copyright (C) 2013 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.timezonepicker;

 import android.content.Context;
 import android.content.SharedPreferences;
 import android.text.TextUtils;
 import android.util.Log;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.AdapterView;
 import android.widget.AdapterView.OnItemClickListener;
 import android.widget.BaseAdapter;
 import android.widget.TextView;

 import com.android.timezonepicker.TimeZoneFilterTypeAdapter.OnSetFilterListener;
 import com.android.timezonepicker.TimeZonePickerView.OnTimeZoneSetListener;

 import java.util.ArrayList;
 import java.util.Iterator;
 import java.util.LinkedHashSet;

 public class TimeZoneResultAdapter extends BaseAdapter implements OnItemClickListener,
         OnSetFilterListener {
     private static final String TAG = "TimeZoneResultAdapter";
     private static final boolean DEBUG = false;
     private static final int VIEW_TAG_TIME_ZONE = R.id.time_zone;
     private static final int EMPTY_INDEX = -100;

     /** SharedPref name and key for recent time zones */
     private static final String SHARED_PREFS_NAME = "com.android.calendar_preferences";
     private static final String KEY_RECENT_TIMEZONES = "preferences_recent_timezones";

     private int mLastFilterType;
     private String mLastFilterString;
     private int mLastFilterTime;

     private boolean mHasResults = false;

     /**
      * The delimiter we use when serializing recent timezones to shared
      * preferences
      */
     private static final String RECENT_TIMEZONES_DELIMITER = ",";

     /** The maximum number of recent timezones to save */
     private static final int MAX_RECENT_TIMEZONES = 3;

     static class ViewHolder {
         TextView timeZone;
         TextView timeOffset;
         TextView location;

         static void setupViewHolder(View v) {
             ViewHolder vh = new ViewHolder();
             vh.timeZone = (TextView) v.findViewById(R.id.time_zone);
             vh.timeOffset = (TextView) v.findViewById(R.id.time_offset);
             vh.location = (TextView) v.findViewById(R.id.location);
             v.setTag(vh);
         }
     }

     private Context mContext;
     private LayoutInflater mInflater;

     private OnTimeZoneSetListener mTimeZoneSetListener;
     private TimeZoneData mTimeZoneData;

     private int[] mFilteredTimeZoneIndices;
     private int mFilteredTimeZoneLength = 0;

     public TimeZoneResultAdapter(Context context, TimeZoneData tzd,
             com.android.timezonepicker.TimeZonePickerView.OnTimeZoneSetListener l) {
         super();

         mContext = context;
         mTimeZoneData = tzd;
         mTimeZoneSetListener = l;

         mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

         mFilteredTimeZoneIndices = new int[mTimeZoneData.size()];

         onSetFilter(TimeZoneFilterTypeAdapter.FILTER_TYPE_NONE, null, 0);
     }

     public boolean hasResults() {
         return mHasResults;
     }

     public int getLastFilterType() {
         return mLastFilterType;
     }

     public String getLastFilterString() {
         return mLastFilterString;
     }

     public int getLastFilterTime() {
         return mLastFilterTime;
     }

     // Implements OnSetFilterListener
     @Override
     public void onSetFilter(int filterType, String str, int time) {
         if (DEBUG) {
             Log.d(TAG, "onSetFilter: " + filterType + " [" + str + "] " + time);
         }

         mLastFilterType = filterType;
         mLastFilterString = str;
         mLastFilterTime = time;

         mFilteredTimeZoneLength = 0;
         int idx = 0;

         switch (filterType) {
             case TimeZoneFilterTypeAdapter.FILTER_TYPE_EMPTY:
                 mFilteredTimeZoneIndices[mFilteredTimeZoneLength++] = EMPTY_INDEX;
                 break;
             case TimeZoneFilterTypeAdapter.FILTER_TYPE_NONE:
                 // Show the default/current value first
                 int defaultTzIndex = mTimeZoneData.getDefaultTimeZoneIndex();
                 if (defaultTzIndex != -1) {
                     mFilteredTimeZoneIndices[mFilteredTimeZoneLength++] = defaultTzIndex;
                 }

                 // Show the recent selections
                 SharedPreferences prefs = mContext.getSharedPreferences(SHARED_PREFS_NAME,
                         Context.MODE_PRIVATE);
                 String recentsString = prefs.getString(KEY_RECENT_TIMEZONES, null);
                 if (!TextUtils.isEmpty(recentsString)) {
                     String[] recents = recentsString.split(RECENT_TIMEZONES_DELIMITER);
                     for (int i = recents.length - 1; i >= 0; i--) {
                         if (!TextUtils.isEmpty(recents[i])
                                 && !recents[i].equals(mTimeZoneData.mDefaultTimeZoneId)) {
                             int index = mTimeZoneData.findIndexByTimeZoneIdSlow(recents[i]);
                             if (index != -1) {
                                 mFilteredTimeZoneIndices[mFilteredTimeZoneLength++] = index;
                             }
                         }
                     }
                 }

                 break;
             case TimeZoneFilterTypeAdapter.FILTER_TYPE_GMT:
                 ArrayList<Integer> indices = mTimeZoneData.getTimeZonesByOffset(time);
                 if (indices != null) {
                     for (Integer i : indices) {
                         mFilteredTimeZoneIndices[mFilteredTimeZoneLength++] = i;
                     }
                 }
                 break;
             case TimeZoneFilterTypeAdapter.FILTER_TYPE_COUNTRY:
                 ArrayList<Integer> tzIds = mTimeZoneData.mTimeZonesByCountry.get(str);
                 if (tzIds != null) {
                     for (Integer tzi : tzIds) {
                         mFilteredTimeZoneIndices[mFilteredTimeZoneLength++] = tzi;
                     }
                 }
                 break;
             case TimeZoneFilterTypeAdapter.FILTER_TYPE_STATE:
                 // TODO Filter by state
                 break;
             default:
                 throw new IllegalArgumentException();
         }
         mHasResults = mFilteredTimeZoneLength > 0;

         notifyDataSetChanged();
     }

     /**
      * Saves the given timezone ID as a recent timezone under shared
      * preferences. If there are already the maximum number of recent timezones
      * saved, it will remove the oldest and append this one.
      *
      * @param id the ID of the timezone to save
      * @see {@link #MAX_RECENT_TIMEZONES}
      */
     public void saveRecentTimezone(String id) {
         SharedPreferences prefs = mContext.getSharedPreferences(SHARED_PREFS_NAME,
                 Context.MODE_PRIVATE);
         String recentsString = prefs.getString(KEY_RECENT_TIMEZONES, null);
         if (recentsString == null) {
             recentsString = id;
         } else {
             // De-dup
             LinkedHashSet<String> recents = new LinkedHashSet<String>();
             for(String tzId : recentsString.split(RECENT_TIMEZONES_DELIMITER)) {
                 if (!recents.contains(tzId) && !id.equals(tzId)) {
                     recents.add(tzId);
                 }
             }

             Iterator<String> it = recents.iterator();
             while (recents.size() >= MAX_RECENT_TIMEZONES) {
                 if (!it.hasNext()) {
                     break;
                 }
                 it.next();
                 it.remove();
             }
             recents.add(id);

             StringBuilder builder = new StringBuilder();
             boolean first = true;
             for (String recent : recents) {
                 if (first) {
                     first = false;
                 } else {
                     builder.append(RECENT_TIMEZONES_DELIMITER);
                 }
                 builder.append(recent);
             }
             recentsString = builder.toString();
         }

         prefs.edit().putString(KEY_RECENT_TIMEZONES, recentsString).apply();
     }

     @Override
     public int getCount() {
         return mFilteredTimeZoneLength;
     }

     @Override
     public Object getItem(int position) {
         if (position < 0 || position >= mFilteredTimeZoneLength) {
             return null;
         }

         return mTimeZoneData.get(mFilteredTimeZoneIndices[position]);
     }

     @Override
     public boolean areAllItemsEnabled() {
         return false;
     }

     @Override
     public boolean isEnabled(int position) {
         return mFilteredTimeZoneIndices[position] >= 0;
     }

     @Override
     public long getItemId(int position) {
         return mFilteredTimeZoneIndices[position];
     }

     @Override
     public View getView(int position, View convertView, ViewGroup parent) {
         View v = convertView;

         if (mFilteredTimeZoneIndices[position] == EMPTY_INDEX) {
             v = mInflater.inflate(R.layout.empty_time_zone_item, null);
             return v;
         }

         // We'll need to re-inflate the view if it was null, or if it was used as an empty item.
         if (v == null || v.findViewById(R.id.empty_item) != null) {
             v = mInflater.inflate(R.layout.time_zone_item, null);
             ViewHolder.setupViewHolder(v);
         }

         ViewHolder vh = (ViewHolder) v.getTag();

         TimeZoneInfo tzi = mTimeZoneData.get(mFilteredTimeZoneIndices[position]);
         v.setTag(VIEW_TAG_TIME_ZONE, tzi);

         vh.timeZone.setText(tzi.mDisplayName);

         vh.timeOffset.setText(tzi.getGmtDisplayName(mContext));

         String location = tzi.mCountry;
         if (location == null) {
             vh.location.setVisibility(View.INVISIBLE);
         } else {
             vh.location.setText(location);
             vh.location.setVisibility(View.VISIBLE);
         }

         return v;
     }

     @Override
     public boolean hasStableIds() {
         return true;
     }

     // Implements OnItemClickListener
     @Override
     public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
         if (mTimeZoneSetListener != null) {
             TimeZoneInfo tzi = (TimeZoneInfo) v.getTag(VIEW_TAG_TIME_ZONE);
             if (tzi != null) {
               mTimeZoneSetListener.onTimeZoneSet(tzi);
               saveRecentTimezone(tzi.mTzId);
             }
         }
     }
 }
	/*
	* Copyright (C) 2013 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.timezonepicker;

	import android.content.Context;
	import android.content.SharedPreferences;
	import android.text.TextUtils;
	import android.util.Log;
	import android.view.LayoutInflater;
	import android.view.View;
	import android.view.ViewGroup;
	import android.widget.AdapterView;
	import android.widget.AdapterView.OnItemClickListener;
	import android.widget.BaseAdapter;
	import android.widget.TextView;

	import com.android.timezonepicker.TimeZoneFilterTypeAdapter.OnSetFilterListener;
	import com.android.timezonepicker.TimeZonePickerView.OnTimeZoneSetListener;

	import java.util.ArrayList;
	import java.util.Iterator;
	import java.util.LinkedHashSet;

	public class TimeZoneResultAdapter extends BaseAdapter implements OnItemClickListener,
	OnSetFilterListener {
	private static final String TAG = "TimeZoneResultAdapter";
	private static final boolean DEBUG = false;
	private static final int VIEW_TAG_TIME_ZONE = R.id.time_zone;
	private static final int EMPTY_INDEX = -100;

	/** SharedPref name and key for recent time zones */
	private static final String SHARED_PREFS_NAME = "com.android.calendar_preferences";
	private static final String KEY_RECENT_TIMEZONES = "preferences_recent_timezones";

	private int mLastFilterType;
	private String mLastFilterString;
	private int mLastFilterTime;

	private boolean mHasResults = false;

	/**
	* The delimiter we use when serializing recent timezones to shared
	* preferences
	*/
	private static final String RECENT_TIMEZONES_DELIMITER = ",";

	/** The maximum number of recent timezones to save */
	private static final int MAX_RECENT_TIMEZONES = 3;

	static class ViewHolder {
	TextView timeZone;
	TextView timeOffset;
	TextView location;

	static void setupViewHolder(View v) {
	ViewHolder vh = new ViewHolder();
	vh.timeZone = (TextView) v.findViewById(R.id.time_zone);
	vh.timeOffset = (TextView) v.findViewById(R.id.time_offset);
	vh.location = (TextView) v.findViewById(R.id.location);
	v.setTag(vh);
	}
	}

	private Context mContext;
	private LayoutInflater mInflater;

	private OnTimeZoneSetListener mTimeZoneSetListener;
	private TimeZoneData mTimeZoneData;

	private int[] mFilteredTimeZoneIndices;
	private int mFilteredTimeZoneLength = 0;

	public TimeZoneResultAdapter(Context context, TimeZoneData tzd,
	com.android.timezonepicker.TimeZonePickerView.OnTimeZoneSetListener l) {
	super();

	mContext = context;
	mTimeZoneData = tzd;
	mTimeZoneSetListener = l;

	mInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);

	mFilteredTimeZoneIndices = new int[mTimeZoneData.size()];

	onSetFilter(TimeZoneFilterTypeAdapter.FILTER_TYPE_NONE, null, 0);
	}

	public boolean hasResults() {
	return mHasResults;
	}

	public int getLastFilterType() {
	return mLastFilterType;
	}

	public String getLastFilterString() {
	return mLastFilterString;
	}

	public int getLastFilterTime() {
	return mLastFilterTime;
	}

	// Implements OnSetFilterListener
	@Override
	public void onSetFilter(int filterType, String str, int time) {
	if (DEBUG) {
	Log.d(TAG, "onSetFilter: " + filterType + " [" + str + "] " + time);
	}

	mLastFilterType = filterType;
	mLastFilterString = str;
	mLastFilterTime = time;

	mFilteredTimeZoneLength = 0;
	int idx = 0;

	switch (filterType) {
	case TimeZoneFilterTypeAdapter.FILTER_TYPE_EMPTY:
	mFilteredTimeZoneIndices[mFilteredTimeZoneLength++] = EMPTY_INDEX;
	break;
	case TimeZoneFilterTypeAdapter.FILTER_TYPE_NONE:
	// Show the default/current value first
	int defaultTzIndex = mTimeZoneData.getDefaultTimeZoneIndex();
	if (defaultTzIndex != -1) {
	mFilteredTimeZoneIndices[mFilteredTimeZoneLength++] = defaultTzIndex;
	}

	// Show the recent selections
	SharedPreferences prefs = mContext.getSharedPreferences(SHARED_PREFS_NAME,
	Context.MODE_PRIVATE);
	String recentsString = prefs.getString(KEY_RECENT_TIMEZONES, null);
	if (!TextUtils.isEmpty(recentsString)) {
	String[] recents = recentsString.split(RECENT_TIMEZONES_DELIMITER);
	for (int i = recents.length - 1; i >= 0; i--) {
	if (!TextUtils.isEmpty(recents[i])
	&& !recents[i].equals(mTimeZoneData.mDefaultTimeZoneId)) {
	int index = mTimeZoneData.findIndexByTimeZoneIdSlow(recents[i]);
	if (index != -1) {
	mFilteredTimeZoneIndices[mFilteredTimeZoneLength++] = index;
	}
	}
	}
	}

	break;
	case TimeZoneFilterTypeAdapter.FILTER_TYPE_GMT:
	ArrayList<Integer> indices = mTimeZoneData.getTimeZonesByOffset(time);
	if (indices != null) {
	for (Integer i : indices) {
	mFilteredTimeZoneIndices[mFilteredTimeZoneLength++] = i;
	}
	}
	break;
	case TimeZoneFilterTypeAdapter.FILTER_TYPE_COUNTRY:
	ArrayList<Integer> tzIds = mTimeZoneData.mTimeZonesByCountry.get(str);
	if (tzIds != null) {
	for (Integer tzi : tzIds) {
	mFilteredTimeZoneIndices[mFilteredTimeZoneLength++] = tzi;
	}
	}
	break;
	case TimeZoneFilterTypeAdapter.FILTER_TYPE_STATE:
	// TODO Filter by state
	break;
	default:
	throw new IllegalArgumentException();
	}
	mHasResults = mFilteredTimeZoneLength > 0;

	notifyDataSetChanged();
	}

	/**
	* Saves the given timezone ID as a recent timezone under shared
	* preferences. If there are already the maximum number of recent timezones
	* saved, it will remove the oldest and append this one.
	*
	* @param id the ID of the timezone to save
	* @see {@link #MAX_RECENT_TIMEZONES}
	*/
	public void saveRecentTimezone(String id) {
	SharedPreferences prefs = mContext.getSharedPreferences(SHARED_PREFS_NAME,
	Context.MODE_PRIVATE);
	String recentsString = prefs.getString(KEY_RECENT_TIMEZONES, null);
	if (recentsString == null) {
	recentsString = id;
	} else {
	// De-dup
	LinkedHashSet<String> recents = new LinkedHashSet<String>();
	for(String tzId : recentsString.split(RECENT_TIMEZONES_DELIMITER)) {
	if (!recents.contains(tzId) && !id.equals(tzId)) {
	recents.add(tzId);
	}
	}

	Iterator<String> it = recents.iterator();
	while (recents.size() >= MAX_RECENT_TIMEZONES) {
	if (!it.hasNext()) {
	break;
	}
	it.next();
	it.remove();
	}
	recents.add(id);

	StringBuilder builder = new StringBuilder();
	boolean first = true;
	for (String recent : recents) {
	if (first) {
	first = false;
	} else {
	builder.append(RECENT_TIMEZONES_DELIMITER);
	}
	builder.append(recent);
	}
	recentsString = builder.toString();
	}

	prefs.edit().putString(KEY_RECENT_TIMEZONES, recentsString).apply();
	}

	@Override
	public int getCount() {
	return mFilteredTimeZoneLength;
	}

	@Override
	public Object getItem(int position) {
	if (position < 0 \|\| position >= mFilteredTimeZoneLength) {
	return null;
	}

	return mTimeZoneData.get(mFilteredTimeZoneIndices[position]);
	}

	@Override
	public boolean areAllItemsEnabled() {
	return false;
	}

	@Override
	public boolean isEnabled(int position) {
	return mFilteredTimeZoneIndices[position] >= 0;
	}

	@Override
	public long getItemId(int position) {
	return mFilteredTimeZoneIndices[position];
	}

	@Override
	public View getView(int position, View convertView, ViewGroup parent) {
	View v = convertView;

	if (mFilteredTimeZoneIndices[position] == EMPTY_INDEX) {
	v = mInflater.inflate(R.layout.empty_time_zone_item, null);
	return v;
	}

	// We'll need to re-inflate the view if it was null, or if it was used as an empty item.
	if (v == null \|\| v.findViewById(R.id.empty_item) != null) {
	v = mInflater.inflate(R.layout.time_zone_item, null);
	ViewHolder.setupViewHolder(v);
	}

	ViewHolder vh = (ViewHolder) v.getTag();

	TimeZoneInfo tzi = mTimeZoneData.get(mFilteredTimeZoneIndices[position]);
	v.setTag(VIEW_TAG_TIME_ZONE, tzi);

	vh.timeZone.setText(tzi.mDisplayName);

	vh.timeOffset.setText(tzi.getGmtDisplayName(mContext));

	String location = tzi.mCountry;
	if (location == null) {
	vh.location.setVisibility(View.INVISIBLE);
	} else {
	vh.location.setText(location);
	vh.location.setVisibility(View.VISIBLE);
	}

	return v;
	}

	@Override
	public boolean hasStableIds() {
	return true;
	}

	// Implements OnItemClickListener
	@Override
	public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
	if (mTimeZoneSetListener != null) {
	TimeZoneInfo tzi = (TimeZoneInfo) v.getTag(VIEW_TAG_TIME_ZONE);
	if (tzi != null) {
	mTimeZoneSetListener.onTimeZoneSet(tzi);
	saveRecentTimezone(tzi.mTzId);
	}
	}
	}
	}