1/*
2 * Copyright (C) 2011 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
17package com.android.gallery3d.ui;
18
19import android.content.Context;
20import android.location.Address;
21import android.os.Handler;
22import android.os.Looper;
23
24import com.android.gallery3d.app.AbstractGalleryActivity;
25import com.android.gallery3d.data.MediaDetails;
26import com.android.gallery3d.util.Future;
27import com.android.gallery3d.util.FutureListener;
28import com.android.gallery3d.util.GalleryUtils;
29import com.android.gallery3d.util.ReverseGeocoder;
30import com.android.gallery3d.util.ThreadPool.Job;
31import com.android.gallery3d.util.ThreadPool.JobContext;
32
33public class DetailsAddressResolver {
34    private AddressResolvingListener mListener;
35    private final AbstractGalleryActivity mContext;
36    private Future<Address> mAddressLookupJob;
37    private final Handler mHandler;
38
39    private class AddressLookupJob implements Job<Address> {
40        private double[] mLatlng;
41
42        protected AddressLookupJob(double[] latlng) {
43            mLatlng = latlng;
44        }
45
46        @Override
47        public Address run(JobContext jc) {
48            ReverseGeocoder geocoder = new ReverseGeocoder(mContext.getAndroidContext());
49            return geocoder.lookupAddress(mLatlng[0], mLatlng[1], true);
50        }
51    }
52
53    public interface AddressResolvingListener {
54        public void onAddressAvailable(String address);
55    }
56
57    public DetailsAddressResolver(AbstractGalleryActivity context) {
58        mContext = context;
59        mHandler = new Handler(Looper.getMainLooper());
60    }
61
62    public String resolveAddress(double[] latlng, AddressResolvingListener listener) {
63        mListener = listener;
64        mAddressLookupJob = mContext.getThreadPool().submit(
65                new AddressLookupJob(latlng),
66                new FutureListener<Address>() {
67                    @Override
68                    public void onFutureDone(final Future<Address> future) {
69                        mAddressLookupJob = null;
70                        if (!future.isCancelled()) {
71                            mHandler.post(new Runnable() {
72                                @Override
73                                public void run() {
74                                    updateLocation(future.get());
75                                }
76                            });
77                        }
78                    }
79                });
80        return GalleryUtils.formatLatitudeLongitude("(%f,%f)", latlng[0], latlng[1]);
81    }
82
83    private void updateLocation(Address address) {
84        if (address != null) {
85            Context context = mContext.getAndroidContext();
86            String parts[] = {
87                address.getAdminArea(),
88                address.getSubAdminArea(),
89                address.getLocality(),
90                address.getSubLocality(),
91                address.getThoroughfare(),
92                address.getSubThoroughfare(),
93                address.getPremises(),
94                address.getPostalCode(),
95                address.getCountryName()
96            };
97
98            String addressText = "";
99            for (int i = 0; i < parts.length; i++) {
100                if (parts[i] == null || parts[i].isEmpty()) continue;
101                if (!addressText.isEmpty()) {
102                    addressText += ", ";
103                }
104                addressText += parts[i];
105            }
106            String text = String.format("%s : %s", DetailsHelper.getDetailsName(
107                    context, MediaDetails.INDEX_LOCATION), addressText);
108            mListener.onAddressAvailable(text);
109        }
110    }
111
112    public void cancel() {
113        if (mAddressLookupJob != null) {
114            mAddressLookupJob.cancel();
115            mAddressLookupJob = null;
116        }
117    }
118}
119