MVVMExample

This is basic tutorial for beginner of MVVM This is simple example of pure MVVM (Model VIew View-Model) android architecture example using Data Binding, ViewModel and many more features.

In this example we can find three packages

1. Model
2. View
3. ViewModel

Model-- It can your pojo class of your model like- UserLogin, ApiResponseModel etc View- This is basically a Activity or Fragment that has enable Data biniding as

ActivityLoginBinding  binding =DataBindingUtil.setContentView(this, R.layout.activity_login);

Here you can set your model to viewmodel

      LoginViewModel loginViewModel = new LoginViewModel(activity);
     
       binding.setLoginData(loginViewModel);  // for bind the ViewModel

In the Layout add

<layout>

<data class="ActivityLoginBinding">

    <variable
        name="loginData"
        type="com.mvvmexample.viewmodel.LoginViewModel" />   this is your viewmodel class
</data>
 <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="10dp"
        android:hint="Username"
        android:imeOptions="actionNext"
        android:inputType="textEmailAddress"
        android:text="@={loginData.dataEmail}" />     //always use @={loginData.dataEmail} for getting the value from model and @{loginData.dataEmail} for set the dynamically value

</layout>
 
 In the viewmodel class
 
     @Bindable
     public String getDataEmail() {
       return loginModel.getEmail();
        }
  
 Add @Bindable for bind the view     

Note: Make sure that "DataEmail" should be same as in the layout name @={loginData.dataEmail}

ViewModel-- This is the main class that can cominucate with both View and Model The ViewModel class is designed to store and manage UI-related data in a lifecycle conscious way. The ViewModel class allows data to survive configuration changes such as screen rotations ViewModel lifecycle is binded with the Activity or Fragment life Cycle

    All the business logic will be implemented in viewmodel class.
    You can add all your work like  Webserices calling, Map, Tab,TabHost, Facebook , GoogleSignIn in your ViewModel

Note:- ViewModel is extends by BaseObservable so that you can get your xml view easily You can also use Observable , Event Bus , Live Data for communication with the view and model.

///Run the Project

1. Download or add the github repo

2. Launch the Login Activity--- when you add anything in email field of edittext it is automatically show to textview that is below the password

     notifyPropertyChanged(BR.dataEmail);   
     // This is used to have instant change in the text view with respect to edittext value
   

You can make change accordingly to your business logic