data binding is not updating view

Question

I am trying to update a view from my viewmodel class but it is not working. Here is my xml file

<data>

    <variable
        name="mainViewModel"
        type=".MainViewModel" />
</data>

<RelativeLayout 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"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

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

        <android.support.v7.widget.Toolbar
            android:id="@+id/toolbar"
            android:layout_width="match_parent"
            android:layout_height="?attr/actionBarSize"
            android:background="@color/black"
            android:elevation="4dp" />

        <View
            android:layout_width="match_parent"
            android:layout_height="4dp"
            android:background="@color/base_color" />

        <TextView
            android:id="@+id/personalNumber"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@drawable/text_border"
            android:gravity="center_vertical"
            android:padding="8dp"
            android:text="@{String.valueOf(mainViewModel.personalNumber)}"
            android:textSize="16sp" />

        <TextView
            android:id="@+id/location"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@drawable/text_border"
            android:gravity="center_vertical"
            android:padding="8dp"
            android:text="@{mainViewModel.location}"
            android:textSize="16sp" />

        <TextView
            android:id="@+id/ordersCount"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@drawable/text_border"
            android:gravity="center_vertical"
            android:padding="8dp"
            android:text="@{mainViewModel.ordersCount}"
            android:textSize="16sp" />

        <Button
            android:layout_width="200dp"
            android:layout_height="wrap_content"
            android:layout_gravity="center_horizontal"
            android:layout_marginTop="30dp"
            android:background="@drawable/main_activity_buttons"
            android:textColor="@color/white" />
    </LinearLayout>
</RelativeLayout>
</layout>

MainViewModel class

public class MainViewModel extends BaseObservable {

private int ordersCount;

@Bindable
public int getPersonalNumber() {
    return MyApplication.getClientPreferences().getPersonalNumber();
}

@Bindable
public String getLocation() {
    return MyApplication.getClientPreferences().getLocation();
}

@Bindable
public String getOrdersCount(){
    return 

MyApplication.getInstance().getResources().getString(R.string.orders_count,ordersCount); }

public void setOrdersCount(int ordersCount) {
    this.ordersCount = ordersCount;
    notifyPropertyChanged(this.ordersCount);
    Toast.makeText(MyApplication.getInstance(), String.valueOf(ordersCount), Toast.LENGTH_SHORT).show();
}
}

I tried to use Observable field for updating view from MainViewModel and it worked. But it is not working by extending MainViewModel from BaseObservable

Answer 1

you might not have called

yourBindingObject.setMainViewModel(mainViewModelObj);

try this and let me know

Answer 2

Please use below property to update data:

notifyPropertyChanged(BR.ordersCount); 

When Notify any listeners, BR is a generated class and BR.ordersCount update your value into Textview at runtime.

Also define like below:

<variable
        name="mainViewModel"
        type="com.app.YourAppName.MainViewModel" /> 

if in that any package is there then also define it's absolute path into it.

Also set value like below:

<TextView
            android:id="@+id/ordersCount"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:background="@drawable/text_border"
            android:gravity="center_vertical"
            android:padding="8dp"
            android:text="@={mainViewModel.ordersCount}"
            android:textSize="16sp" />

hope this helped you.