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/*
* Copyright (C) 2009 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.camera;
import android.location.Address;
import android.location.Geocoder;
import android.os.AsyncTask;
import android.util.Log;
import java.io.IOException;
import java.util.List;
/**
* A asynchronous task which does reverse geocoding.
*
* <p>Because it may take a long time to return, we put it in an AsyncTask.
* The input is latitude and longitude, and the output is a descriptive string
* for the specified location. The result is passed to a callback.
*/
public class ReverseGeocoderTask extends AsyncTask<Void, Void, String> {
private static final String TAG = "ReverseGeocoder";
/**
* A callback to be invoked when the reverse geocoding task is done.
*/
public static interface Callback {
public void onComplete(String location);
}
private Geocoder mGeocoder;
private float mLat;
private float mLng;
private Callback mCallback;
public ReverseGeocoderTask(Geocoder geocoder, float[] latlng,
Callback callback) {
mGeocoder = geocoder;
mLat = latlng[0];
mLng = latlng[1];
mCallback = callback;
}
@Override
protected String doInBackground(Void... params) {
String value = MenuHelper.EMPTY_STRING;
try {
List<Address> address = mGeocoder.getFromLocation(mLat, mLng, 1);
StringBuilder sb = new StringBuilder();
for (Address addr : address) {
int index = addr.getMaxAddressLineIndex();
sb.append(addr.getAddressLine(index));
}
value = sb.toString();
} catch (IOException ex) {
value = MenuHelper.EMPTY_STRING;
Log.e(TAG, "Geocoder exception: ", ex);
} catch (RuntimeException ex) {
value = MenuHelper.EMPTY_STRING;
Log.e(TAG, "Geocoder exception: ", ex);
}
return value;
}
@Override
protected void onPostExecute(String location) {
mCallback.onComplete(location);
}
}
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