WEBVTT 00:00.120 --> 00:01.000 Welcome back. 00:01.200 --> 00:08.720 In this video, we're gonna learn about something special in Google Maps called geocoding API. 00:08.920 --> 00:17.840 Geocoding and reverse geocoding are essential features for converting between addresses and geographic 00:17.840 --> 00:18.760 coordinates. 00:18.800 --> 00:20.520 Latitude and longitude. 00:20.720 --> 00:28.880 So if we go to Developers.google.com and search for geocoding, you will get directed to this page. 00:29.000 --> 00:31.480 Geocoding API overview. 00:31.600 --> 00:39.440 The geocoding API is a service that accepts a place as an address, latitude and longitude coordinates, 00:39.440 --> 00:41.240 or place ID. 00:41.320 --> 00:48.680 It converts the address into latitude and longitude coordinates, and the place ID or converts latitude 00:48.680 --> 00:52.760 and longitude coordinates, or a place ID into an address. 00:53.000 --> 00:56.400 This is called reverse geocoding. 00:56.440 --> 00:56.920 Okay. 00:57.120 --> 01:00.480 Now, uh, for example, what is this geocoding? 01:00.480 --> 01:10.130 If you have this map, I want to, uh, search for, um, for example, France and uh, for example, 01:10.170 --> 01:11.330 select France. 01:11.370 --> 01:15.890 You notice that there is a new marker placed into France. 01:15.930 --> 01:25.970 If I want to search for New York State or New York City, uh, public library, for example, I get 01:25.970 --> 01:29.890 directed to this public library in New York. 01:29.890 --> 01:34.850 So if we zoom out, you notice that we are in New York. 01:34.890 --> 01:35.410 Okay. 01:35.690 --> 01:42.610 So we need to allow this feature in our application using the geocoding. 01:42.850 --> 01:49.530 By the way, whenever you import the play services location you import the geocoding. 01:49.690 --> 01:53.210 So there is no need to implement any thing. 01:53.330 --> 02:01.690 You need to add only the codes without adding new libraries, because we added the location and the 02:01.690 --> 02:04.130 play services A location. 02:04.170 --> 02:05.090 A dependency. 02:05.130 --> 02:08.650 Okay, now I want from you to focus with me. 02:08.850 --> 02:12.010 Let me just make a new note here. 02:12.050 --> 02:15.370 Geocoding converts an address to lat long. 02:15.370 --> 02:24.970 For example, Eiffel Tower for 8.8 at 2.29, and the reverse geocoding converts lat long into an address. 02:24.970 --> 02:31.850 For example, this is the coordinates and the lat long for Eiffel Tower, and the address is Eiffel 02:31.970 --> 02:32.450 Tower. 02:32.490 --> 02:38.770 So there is no required dependencies, uh, except the location that we implemented in the previous 02:38.770 --> 02:39.330 video. 02:39.530 --> 02:42.450 And let me start geocoding. 02:42.610 --> 02:47.610 Create a new function here called du code address. 02:47.730 --> 02:53.210 This function takes three parameters the context object. 02:53.330 --> 03:03.290 The address which is a string on result, which is a lambda expression, takes lat long as a parameter 03:03.610 --> 03:05.740 and returns nothing. 03:05.780 --> 03:15.820 Okay, now val Geocoder equals to new instance of geocoder from Android dot location. 03:16.060 --> 03:24.580 So don't miss to add this correct package and new that the Geocoder class and pass the context. 03:24.620 --> 03:31.020 This function, called geocode address takes a context object address and on result. 03:31.300 --> 03:39.500 The Geocoder is a system service that performs geocoding address to lat long conversion and reverse 03:39.540 --> 03:42.220 geocoding lat long to address. 03:42.260 --> 03:49.980 It uses the device local by default and requires internet connection because it uses a back end service, 03:50.020 --> 03:52.620 not a local data. 03:52.620 --> 04:02.220 But at first we that that the algorithm and the idea behind creating this function is to get a geographic 04:02.300 --> 04:10.460 address, convert it to coordinates, and then call on a result callback with a lat long object, or 04:10.500 --> 04:12.580 null if conversion fails. 04:12.660 --> 04:21.900 So this is the Geocoder class, and we need to use it in order to convert the addresses into lat long. 04:22.100 --> 04:35.140 Start with try addresses equals to geocoding or geocoder dot get location from location name and pass 04:35.140 --> 04:37.700 the address and one. 04:37.740 --> 04:44.060 This is the maximum result one and pass the address that we pass as a parameter. 04:44.220 --> 04:49.220 Then check if address or addresses is not empty. 04:49.540 --> 04:52.980 Is not empty equals to true. 04:53.300 --> 04:56.260 Then we need to go here. 04:56.580 --> 05:07.700 Then val location equals to addresses at index zero val lat long equals to lat long. 05:07.870 --> 05:09.550 Get the location. 05:09.550 --> 05:11.670 Latitude and location. 05:12.030 --> 05:13.110 Longitude. 05:13.150 --> 05:13.630 Okay. 05:13.790 --> 05:18.630 And on a result, get back the lat long. 05:18.670 --> 05:20.590 Else what we need to do. 05:20.750 --> 05:25.390 We need to make on result and pass null to it. 05:25.430 --> 05:35.110 Catch block exception I o exception e dot print stack trace and on result pass null. 05:35.150 --> 05:39.590 Okay, this is the logic what we did here. 05:39.830 --> 05:46.670 We create a geocoding function that takes into the parameter context address. 05:46.670 --> 05:48.750 And on result the. 05:49.350 --> 05:53.430 The check here is Geocoder dot get from location name. 05:53.630 --> 05:57.110 Pass the address and maximum result should be one. 05:57.430 --> 06:05.430 If there is a result, go and call the result callback function which is this and pass the lat long 06:05.470 --> 06:07.230 of the location. 06:07.230 --> 06:08.630 So give me the address. 06:08.630 --> 06:10.550 I give you the lat long.