DataBindingExample

• Library Data Binding

Important enable DataBinding on your project, setup in gradle.

android {

    ...
    
    //Android Studio Version Until 4
    dataBinding {
        enabled = true
    }
    
    //Android Studio Version 4 -> gradle version 6.1.1 -> android gradle plugin version 4.0.0
    buildFeatures{
        dataBinding = true
    }

}

Add Dependencies to enable ViewModel.

dependencies {
    
    ...
    
    //mvvm
    implementation 'android.arch.lifecycle:viewmodel:1.1.1'
    implementation 'android.arch.lifecycle:livedata:1.1.1'
    implementation 'android.arch.lifecycle:extensions:1.1.1'
}

ViewModel Example.

import androidx.lifecycle.ViewModel;

public class MyViewModel extends ViewModel {

    public MutableLiveData<String> str = new MutableLiveData<>();
    
    public MyViewModel() {
    }
}

DataBinding On Activity

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<layout>

    <data>

        <variable
            name="viewModel"
            type="com.gzeinnumer.databindingexample.MyViewModel" />
    </data>
    
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
    
        <TextView
            android:text="@{viewModel.str}"
            android:id="@+id/my_text_view"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"/>
    
    </LinearLayout>
</layout>

MainActivity.java

public class MainActivity extends AppCompatActivity implements AdapterRVMultiType.MyOnClick {

    private ActivityMainBinding binding;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        binding = DataBindingUtil.setContentView(this, R.layout.activity_main);
        binding.setViewModel(new MyViewModel());
        
        binding.myTextView.setText("Hallo GZeinNumer");
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
        binding = null;
    }
}

FullCode

DataBinding On Fragment

fragment_main.xml

<?xml version="1.0" encoding="utf-8"?>
<layout>

    <data>

        <variable
            name="viewModel"
            type="com.gzeinnumer.databindingexample.MyViewModel" />
    </data>
    
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
    
        <TextView
            android:text="@{viewModel.str}"
            android:id="@+id/my_text_view"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"/>
    
    </LinearLayout>
</layout>

MainFragment.java

public class MainFragment extends Fragment {

    private FragmentMainBinding binding;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        binding = DataBindingUtil.setContentView(requireActivity(), R.layout.fragment_main);
        binding.setViewModel(new MyViewModel());
        return binding.getRoot();
    }

    @Override
    public void onDestroyView() {
        super.onDestroyView();
        binding = null;
    }
}

FullCode

DataBinding On AdapterRecyclerView (Single Type)

item_list.xml

<?xml version="1.0" encoding="utf-8"?>
<layout>

    <data>

        <variable
            name="viewModel"
            type="com.gzeinnumer.databindingexample.MyViewModel" />
    </data>
    
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
    
        <TextView
            android:text="@{viewModel.str}"
            android:id="@+id/my_text_view"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"/>
    
    </LinearLayout>
</layout>

AdapterRV.java

public class AdapterRV extends RecyclerView.Adapter<AdapterRV.MyHolder> {
    
    ...
    
    @NonNull
    @Override
    public MyHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        ItemListBinding binding = ItemListBinding.inflate(LayoutInflater.from(parent.getContext()), parent, false)
        binding.setViewModel(new MyViewModel());
        return new MyHolder(binding);
    }

    public static class MyHolder extends RecyclerView.ViewHolder {
        ItemAdapterRvBinding binding;

        public MyHolder(ItemAdapterRvBinding itemView) {
            super(itemView.getRoot());
            binding = itemView;
        }

        public void bindData(String data){
            binding.myTextView.setText(data);
        }
    }
}

FullCode

DataBinding On AdapterRecyclerView (Multi Type)

item_list.xml

<?xml version="1.0" encoding="utf-8"?>
<layout>

    <data>

        <variable
            name="viewModel"
            type="com.gzeinnumer.databindingexample.MyViewModel" />
    </data>
    
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
    
        <TextView
            android:text="@{viewModel.str}"
            android:id="@+id/my_text_view"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"/>
    
    </LinearLayout>
</layout>

AdapterRV.java

public class AdapterRV extends RecyclerView.Adapter<AdapterRV.MyHolder> {
    
    ...
    
    @NonNull
    @Override
    public MyHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        if (holder.getItemViewType() == TYPE_NORMAL) {
            ItemListBinding binding = ItemListBinding.inflate(LayoutInflater.from(parent.getContext()), parent, false)
            binding.setViewModel(new MyViewModel());
            return new MyHolder(binding);
        } else {
            throw new IllegalStateException("Unexpected value: " + holder.getItemViewType());
        }
        
    }

    public static class MyHolder extends RecyclerView.ViewHolder {
        ItemAdapterRvBinding binding;

        public MyHolder(ItemAdapterRvBinding itemView) {
            super(itemView.getRoot());
            binding = itemView;
        }

        public void bindData(String data){
            binding.myTextView.setText(data);
        }
    }
    
    private static int TYPE_NORMAL = 1;

    @Override
    public int getItemViewType(int position) {
        if (position!=-1){
            return TYPE_NORMAL;
        } else {
            return 0;
        }
    }
}

FullCode

DataBinding On DialogFragment

fragment_main_dialog.xml

<?xml version="1.0" encoding="utf-8"?>
<layout>

    <data>

        <variable
            name="viewModel"
            type="com.gzeinnumer.databindingexample.MyViewModel" />
    </data>
    
    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
    
        <TextView
            android:text="@{viewModel.str}"
            android:id="@+id/my_text_view"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"/>
    
    </LinearLayout>
</layout>

MainDialog.java

public class MainDialog extends DialogFragment {

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        binding = DataBindingUtil.setContentView(requireActivity(), R.layout.fragment_main_dialog);
        binding.setViewModel(new MyViewModel());
        
        return binding.getRoot();
    }

    @Override
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        
        binding.myTextView.setText("Hallo GZeinNumer");
    }

    @Override
    public void onDestroyView() {
        super.onDestroyView();
        binding = null;
    }
}

FullCode

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Copyright 2020 M. Fadli Zein