1 /* 2 * Copyright (C) 2018 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.settings.datetime.timezone.model; 18 19 import android.app.LoaderManager; 20 import android.content.Context; 21 import android.content.Loader; 22 import android.os.Bundle; 23 24 import com.android.settingslib.utils.AsyncLoader; 25 26 public class TimeZoneDataLoader extends AsyncLoader<TimeZoneData> { 27 TimeZoneDataLoader(Context context)28 public TimeZoneDataLoader(Context context) { 29 super(context); 30 } 31 32 @Override loadInBackground()33 public TimeZoneData loadInBackground() { 34 // Heavy operation due to reading the underlying file 35 return TimeZoneData.getInstance(); 36 } 37 38 @Override onDiscardResult(TimeZoneData result)39 protected void onDiscardResult(TimeZoneData result) { 40 // This class doesn't hold resource of the result. 41 } 42 43 public interface OnDataReadyCallback { onTimeZoneDataReady(TimeZoneData data)44 void onTimeZoneDataReady(TimeZoneData data); 45 } 46 47 public static class LoaderCreator implements LoaderManager.LoaderCallbacks<TimeZoneData> { 48 49 private final Context mContext; 50 private final OnDataReadyCallback mCallback; 51 LoaderCreator(Context context, OnDataReadyCallback callback)52 public LoaderCreator(Context context, OnDataReadyCallback callback) { 53 mContext = context; 54 mCallback = callback; 55 } 56 57 @Override onCreateLoader(int id, Bundle args)58 public Loader onCreateLoader(int id, Bundle args) { 59 return new TimeZoneDataLoader(mContext); 60 } 61 62 @Override onLoadFinished(Loader<TimeZoneData> loader, TimeZoneData data)63 public void onLoadFinished(Loader<TimeZoneData> loader, TimeZoneData data) { 64 if (mCallback != null) { 65 mCallback.onTimeZoneDataReady(data); 66 } 67 } 68 69 @Override onLoaderReset(Loader<TimeZoneData> loader)70 public void onLoaderReset(Loader<TimeZoneData> loader) { 71 //It's okay to keep the time zone data when loader is reset 72 } 73 } 74 } 75