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This example will be further enhanced in the next chapter with the inclusion of LiveData and data binding support. In the chapter entitled Creating an Example Java Android App in Android Studio , a project named AndroidSample was created in which all of the code for the app was bundled into the main Activity class file.
In the chapter that followed, an AVD emulator was created and used to run the app. While the app was running, we experienced first-hand the kind of problems that occur when developing apps in this way when the data displayed on a TextView widget was lost during a device rotation.
This chapter will implement the same currency converter app, this time using the ViewModel component and following the Google app architecture guidelines to avoid Activity lifecycle complications.
The first step in this exercise is to create the new project. Select the Start a new Android Studio project quick start option from the welcome screen and, within the resulting new project dialog, enter ViewModelDemo into the Application name field and ebookfrenzy.
When the AndroidSample project was created, the Basic Activity template was chosen as the basis for the project. This will generate an Android Studio project structured to conform to the architectural guidelines.
Select this option as shown in Figure before clicking the Next button:. On the final setup screen, accept the default file names and create the project using the Finish button.
The key components of the project are as follows:. The first point to note is that the user interface of the main activity has been structured so as to allow a single activity to act as a container for all of the screens that will eventually be needed for the completed app.
The FrameLayout container is just a placeholder which will be replaced at runtime by the content of the first screen that is to appear when the app launches.
This content will typically take the form of a Fragment consisting of an XML layout resource file and corresponding class file.
In fact, when the project was created, Android Studio created an initial fragment for this very purpose. It is worth taking some time at this point to look at the code that has already been generated by Android Studio to display this fragment within the activity container area.
The key lines of code appear within the onCreate method of this class and replace the object with the id of container which has already been assigned to the FrameLayout placeholder view with the MainFragment class:.
The code that accompanies the fragment can be found in the MainFragment. Within this class file is the onCreateView method which is called when the fragment is created.
This is declared as a sub-class of the ViewModel Android architecture component class and is ready to be modified to store the data model for the app:.
The next step is to design the layout of the fragment. Once the layout has loaded, select the existing TextView widget and use the Attributes tool window to change the id property to resultText.
Drag a Number Decimal view from the palette and position it above the existing TextView. With the view selected in the layout refer to the Attributes tool window and change the id to dollarText.
With the button still selected, change the id property to convertButton. At this point, the layout should resemble that illustrated in Figure Click on the Infer constraints button Figure to add any missing layout constraints:.
With the user interface layout completed, the data model for the app needs to be created within the view model.
Within the Project tool window, locate the MainViewModel. The class declares variables to store the current dollar string value and the converted amount together with getter and setter methods to provide access to those data values.
When called, the setAmount method takes as an argument the current dollar amount and stores it in the local dollarText variable.
The dollar string value is converted to a floating point number, multiplied by a fictitious exchange rate and the resulting euro value stored in the result variable.
The getResult method, on the other hand, simply returns the current value assigned to the result variable. A Fragment or Activity maintains references to the ViewModels on which it relies for data using an instance of the ViewModelProvider class.
When called, the method is passed a reference to the current Fragment or Activity and returns a ViewModelProvider instance as follows:.
Once the ViewModelProvider instance has been created, the get method can be called on that instance passing through the class of specific ViewModel that is required.
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