- DataBinding
- LiveData
- include
・ activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<layout>
<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<include layout="@layout/content_main" android:id="@+id/content_main_binding" />
</android.support.constraint.ConstraintLayout>
</layout>・ content_main.xml
<?xml version="1.0" encoding="utf-8"?>
<layout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools" >
<data>
<variable name="viewModel" type="com.nambry.android.androidcalculatorapp.viewmodels.CalculatorViewModel" />
</data>
<android.support.constraint.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
・・・
</android.support.constraint.ConstraintLayout>
</layout>・ MainActivity.java
public class MainActivity extends AppCompatActivity {
private CalculatorViewModel viewModel;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
ActivityMainBinding activityMainBinding = DataBindingUtil.setContentView(this, R.layout.activity_main);
// <include layout="..." android:id="@+id/content_main_binding />のidからcontentMainBindingが参照できるようになる
ContentMainBinding contentMainBinding = activityMainBinding.contentMainBinding;
viewModel = ViewModelProviders.of(this).get(CalculatorViewModel.class);
contentMainBinding.setViewModel(viewModel);
contentMainBinding.setLifecycleOwner(this);
}
}