Android DataBinding onClick event not working-CodePudding

Tries to add actions to the onClick() event button (with DataBinding). I do everything like in the materials found on the web, but it doesn't work. The onSetLocationClick() method is not called.

activity_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="location"
            type="com.example.mytracker.model.Location" />

        <variable
            name="activity"
            type="com.example.mytracker.MainActivity" />
    </data>

    <androidx.constraintlayout.widget.ConstraintLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:paddingLeft="10dp"
        android:paddingTop="10dp"
        android:paddingRight="10dp"
        android:paddingBottom="10dp"
        tools:context=".MainActivity">

        <TextView
            android:id="@ id/tvLongitude"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="20dp"
            android:layout_marginTop="20dp"
            android:text='@{location.longitudeText}'
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintTop_toTopOf="parent" />

        <Button
            android:id="@ id/bSetLocation"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginLeft="20dp"
            android:layout_marginTop="20dp"
            android:onClick="@{() -> activity.onSetLocationClick()}"
            android:text="SET LOCATION"
            app:layout_constraintLeft_toLeftOf="parent"
            app:layout_constraintTop_toBottomOf="@id/tvLongitude" />
    </androidx.constraintlayout.widget.ConstraintLayout>
</layout>

MainActivity.java:

public class MainActivity extends AppCompatActivity {

    private ActivityMainBinding binding;
    Location location = new Location();

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        binding = DataBindingUtil.setContentView(this, R.layout.activity_main);
        binding.setLocation(location);
        TextView tvLabel = binding.tvLabel;

        location.longitude = 1.1;
    }

    public void onSetLocationClick() {
        location.longitude=99;
    }
}

In build.gradle file i was added:

buildFeatures {
    dataBinding true
}

I found a few similar threads but found no solution in any of them.

I will add that after changing the declaration

android:onClick="@{() -> activity.onSetLocationClick()}"

android:onClick="onSetLocationClick"

and declaration method from

 public void onSetLocationClick()

 public void onSetLocationClick(View view)

the code works fine.

However, I would like to use:

android:onClick="@{() -> activity.onSetLocationClick()}"

CodePudding user response：

You have to call setActivity() on your binding to actually initialize your activity variable.

CodePudding user response：

    setContentView(R.layout.activity_main);

Remove this line in your code and check it,