How to use data-binding in Dialog?

I am having trouble in implementing databinding in a Dialog. Is it possible?

Below is my xml.

http://schemas.android.com/apk/res/android">

<data>

    <variable
        name="olaBooking"
        type="com.example.myapp.viewmodels.ViewModel" />
</data>

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <android.support.v7.widget.CardView
        android:id="@+id/cv"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_margin="15dp"
        android:elevation="4dp"
        android:padding="15dp">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical">

            <TextView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:background="@color/colorPrimary"
                android:gravity="center"
                android:padding="15dp"
                android:text="OLA Cab Booked !"
                android:textAppearance="@style/TextAppearance.AppCompat.Body1" />

            <View
                android:layout_width="match_parent"
                android:layout_height="2dp"
                android:background="@color/colorPrimaryDark" />

            <TextView
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:gravity="start|center"
                android:padding="15dp"
                android:text="Car Details" />

            <View
                android:layout_width="match_parent"
                android:layout_height="2dp"
                android:background="@color/colorPrimaryDark" />

            <TextView
                android:id="@+id/driverName"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:padding="5dp"
                android:text="@{olaBooking.driverName}" />

            <TextView
                android:id="@+id/carModel"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:padding="5dp"
                android:text="@{olaBooking.getCarName}" />

            <TextView
                android:id="@+id/carNo"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:padding="5dp"
                android:text="@{olaBooking.getCabNo}" />

            <TextView
                android:id="@+id/eta"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:padding="5dp"
                android:text="@{olaBooking.getEta}" />
        </LinearLayout>
    </android.support.v7.widget.CardView>
</LinearLayout>

I want to bind the above layout in a Dialog. How is it possible? Below is my java code i tried but it's not working

        dialog.setContentView(R.layout.dialog_ola_booking_confirmed);
    DialogOlaBookingConfirmedBinding binding = DataBindingUtil.inflate(
            LayoutInflater.from(dialog.getContext()),
            R.layout.dialog_ola_booking_confirmed,
            (ViewGroup) dialog.findViewById(R.id.cv),
            false);
    ViewModel viewModel = new ViewModel(this, event.olaBooking);

It is possible to use databinding in a Dialog, first to get the binding working on your Dialog you should inflate it first and pass it to the setContentView like this.

DialogOlaBookingConfirmedBinding binding = DataBindingUtil.inflate(LayoutInflater.from(getContext()), R.layout. dialog_ola_booking_confirmed, null, false);
setContentView(binding.getRoot());

Then you can pass the viewModel:

binding.setViewModel(new ViewModel(this, event.olaBooking));

And now you can see it working.

Here is a full example of an AlertDialog with Databinding:

import android.app.Dialog;
import android.databinding.DataBindingUtil;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.DialogFragment;
import android.support.v4.app.FragmentActivity;
import android.support.v7.app.AlertDialog;
import android.view.LayoutInflater;


public class MyDialog extends DialogFragment {

    private static final String KEY_MY_INFO = "KEY_MY_INFO";

    private String myInfo;

    public static MyDialog newInstance(String myInfo) {
        MyDialog dialog = new MyDialog();
        Bundle bundle = new Bundle();
        bundle.putString(KEY_MY_INFO, myInfo);
        dialog.setArguments(bundle);
        return dialog;
    }

    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        myInfo = getArguments().getString(KEY_MY_INFO);
    }

    @NonNull
    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        FragmentActivity activity = getActivity();
        
        MyInfoBinding binding = DataBindingUtil.inflate(LayoutInflater.from(getContext()),
                R.layout.my_info_dialog_layout, null, false);

        binding.setMyInfo(myInfo);

        return new AlertDialog.Builder(activity, R.style.AppCompatAlertDialogStyle)
                .setView(binding.getRoot())
                .create();
    }

}

You should not use DataBindingUtil for generated classes as said in Android Documentation

You should use generated binding class's inflate & bind method ( MyDialogBinding.inflate).

public void showDialog(final Context context) {
    Dialog dialog = new Dialog(context);
    MyDialogBinding binding = MyDialogBinding.inflate(LayoutInflater.from(context));
    dialog.setContentView(binding.getRoot());
    dialog.show();
}

###Can it be simpler? No!

Binding Document says for DataBindingUtil class's inflate method.

> Use this version only if layoutId is unknown in advance. Otherwise, > use the generated Binding's inflate method to ensure type-safe > inflation. DataBindingUtil.inflate(LayoutInflater.from(getContext()),R.layout.my_info_dialog_layout, null, false);

This is like finding binding generated class, when we have class already.

Instead use this

MyDialogBinding binding = MyDialogBinding.inflate(LayoutInflater.from(context));
    

or if you want make another class.

public class MyDialog extends Dialog {
    public MyDialog(@NonNull Context context) {
        super(context);
    }
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        MyDialogBinding binding = MyDialogBinding.inflate(LayoutInflater.from(getContext()));
        setContentView(binding.getRoot());
    }
}

You can do the same without calling getRoot().

View view = LayoutInflater.from(getContext()).inflate(R.layout.dialog_delete_confirmation, null, false);

mBinding = DialogDeleteConfirmationBinding.bind(view);

mBinding.setViewModel(viewModel);

builder.setView(view);

builder.create();

  mBinding = DataBindingUtil.inflate(LayoutInflater.from(getContext()), R.layout.dialog_select, null, false);
    setContentView(mBinding.getRoot());
    SelectDialogBean data = new SelectDialogBean();
    mBinding.setData(data);

If you don't want to extend Dialog, another possible solution could be:

Dialog dialog = new Dialog(this); // where "this" is the context

YourClassNameBinding binding = DataBindingUtil.inflate(dialog.getLayoutInflater(), R.layout.your_layout, null, false);
binding.setYourData(yourData);

dialog.setContentView(binding.getRoot());
dialog.show();

Hope it helps.

**

You should use activity inside of context for DialogFragment.

**

The problem when you use databinding in DialogFragment is theme is not respect to dark mode colors. If you have problem with this use LayoutInflater.from(activity) inside of LayoutInflater.from(context)

If your dialog shrink, Try this

I tried @Dullahan's answer, however the dialog seemed to shrink strangely. So I tried another ways, finally found solution.

<layout
    xmlns:android="http://schemas.android.com/apk/res/android">

    <androidx.constraintlayout.widget.ConstraintLayout
        android:id="@+id/root"
        android:layout_width="300dp"
        android:layout_height="500dp">

        <!-- ... -->

    </androidx.constraintlayout.widget.ConstraintLayout>
</layout>

class CustomDialog(context: Context) : Dialog(context) {
    private lateinit var binding: CustomDialogBinding
    
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.custom_dialog)
        binding = CustomDialogBinding.bind(findViewById(R.id.root))
    }
}