Plugging in the Data

Our next step is to update our data model. 0:00 In current weather, we need to create two different constructors for our class. 0:03 Fortunately, Android Studio can generate those for us. 0:07 Go to Code > Generate > Constructor. 0:11 As I mentioned, we need two different constructors in our class. 0:16 So we'll generate the first one that will accept no arguments. 0:20 We just need to click on Select None. 0:23 Give some space. 0:26 We'll generate our second one. 0:28 Instructor, this one, we'll select all the variables. 0:32 And let's clean this up a little bit. 0:38 The basic constructor is used in main activity 0:40 in our get current details method. 0:43 The second constructor will be used when we bind our data. 0:45 And these dual constructors are a great example 0:49 of constructor overloading in Java. 0:52 For more information about this, check the teachers notes. 0:55 Alright, with our model updated, 0:58 let's take another look at the data binding documentation. 1:00 If we look here at Binding Data, we see that the easiest means for 1:04 creating the bindings is to do it while inflating. 1:09 I'm all about doing things the easiest way possible. 1:13 So let's follow this example. 1:16 So we need to go back into onCreate and adjust our set content view statement. 1:18 Back into MainActivity, so here we're at SetContentView. 1:26 ActivityMainBinding, Binding, do our imports. 1:33 It's gonna be a DataBindingUtil, 1:41 convert context, MainActivity.this. 1:46 Let's drop that down to a new line. 1:52 The documentation says that we need to bind our data to our new binding variable. 1:54 Well, we don't have any data at this point in onCreate. 1:59 We do, however, have it down in onResponse, 2:02 where we're making a call to getCurrentDetails. 2:05 So let's bind our data at that point. 2:08 So down here in onResponse, We'll 2:11 make a new CurrentWeather, Object, we'll call it displayWeather. 2:16 Will be new CurrentWeather. 2:25 Here's where we'll use our new constructor. 2:30 We'll pass in the information from our CurrentWeather variable as called for 2:32 in the constructor. 2:36 GetIcon. 2:44 GetTime. 2:48 GetTemperature. 2:54 GetHumidity. 2:59 GetPrecipChance. 3:02 Get our summary. 3:07 And get our time zone. 3:11 Fantastic, now we need to use this new displayWeather with our binding 3:15 variable to bind our data. 3:20 We can do binding.setWeather, and we'll pass in displayWeather. 3:22 Since we're using binding from within an inter class, 3:29 we need to make sure that it's declared final. 3:32 And it is, thank you Android Studio. 3:37 Since we already have one data point, our summary, set up in our layout, 3:41 let's run this and make sure our data is coming through. 3:44 And it's changed in our app, and if we look in Logcat and our JSON data. 3:53 It's the same there. 4:05 That's awesome. 4:07 Let's head over to our activity main XML file and update the rest of our fields. 4:08 Before we get started on this process, 4:16 let's think a little bit about what our text field is wanting. 4:18 It's expecting string values, so we're going to have to make a decision. 4:22 Do we want to alter our model and store data as strings? 4:26 Or do we want to convert them to strings here in the XML? 4:30 I think it makes more sense to keep our data in its native state in our model. 4:34 With that in mind, let's look at our temperature value here. 4:38 We want to update this static value to our data value. 4:43 We'll do @ with our curly braces. 4:48 We wanna convert it to a string and get the value of, 4:52 weather.tempeture. 5:00 Next up is our time value. 5:03 Here we want to use our formatted time and 5:09 add it into the middle of our statement of at such and such a time it will be. 5:12 To concatenate text inside an Android text value, 5:17 we need to use the grave accent character instead of quotes. 5:20 That character is found above the Tab key on most keyboards. 5:25 Inside our time value then, our string will look like this. 5:29 Grave accent At space and we'll concatenate, 5:38 String.valueOf. 5:46 Weather.formattedTime, and then the rest of our string characters. 5:51 It will be and another grave accent. 5:56 Let's go down to humidity. 6:00 Humidity value, String, 6:04 value of, weather.humidity. 6:11 And for precipitation, 6:21 we need to concatenate that percent sign in there as well. 6:23 Add in a grave accent with a percent. 6:40 Let's run it again and see how that looks. 6:43 Well, there's our data, but our temperature has a decimal point in there, 6:53 and our precipitation value is a decimal. 6:57 I think just having the whole number is better, and 7:01 it fits with our design markups also. 7:03 Again, it's decision time for how we handle that. 7:06 We can do it in our model or in our XML. 7:09 We can certainly handle it in either place but changing it in the XML allows for 7:12 more flexibility if we decide to expand our app to another activity and 7:17 need to use the data elsewhere. 7:22 Therefore, let's update the temperature and precipitation values in there. 7:24 We can use the round method from Java's Math class to round our values. 7:28 For temperature, then, we can go back up here to temperature. 7:33 We'll do Math.round, weather.Temperature. 7:44 And for precipitation, 7:56 we want to multiply it by 100 to make the decimal into a percentage as well. 7:58 Math.round. 8:08 Let's run it again. 8:18 Very nice, our text data is coming through and updating our view. 8:26 This is looking great. 8:30 We lost all of our default text though, in this process, 8:32 making it a bit of a challenge in our design pane. 8:35 Let's add the default values back in, not only for ourselves during the development 8:38 process, but also so our users don't have to stare at a blank screen. 8:44 So we'll come here, Default, 50%. 8:48 For humidity, Default, 9:00 0.88. 9:09 Default here will be at 5 o'clock PM, it will be. 9:19 For temperature, we'll do a default, 100. 9:32 And we'll add one for the summary as well. 9:41 Default is stormy with a chance of meatballs. 9:52 Remember to use the grave accent character there to be able to have spaces in our 10:00 strings. 10:04 This is looking nice, but what about that weather icon? 10:05 Let's see about updating that next. 10:08