Endless RecyclerView with ProgressBar for pagination

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HERE IS SIMPLER AND CLEANER APPROACH.

Implement Endless Scrolling from this Codepath Guide and then follow the following steps.

1. Add progress bar under the RecyclerView.

    <android.support.v7.widget.RecyclerView
        android:id="@+id/rv_movie_grid"
        android:layout_width="0dp"
        android:layout_height="0dp"
        android:paddingBottom="50dp"
        android:clipToPadding="false"
        android:background="@android:color/black"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent">

    </android.support.v7.widget.RecyclerView>

    <ProgressBar
        android:id="@+id/progressBar"
        style="?android:attr/progressBarStyle"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:visibility="invisible"
        android:background="@android:color/transparent"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent" />

Here android:paddingBottom=”50dp” and android:clipToPadding=”false” are very important.

2. Get a reference to the progress bar.

progressBar = findViewById(R.id.progressBar);

3. Define methods to show and hide progress bar.

void showProgressView() {
    progressBar.setVisibility(View.VISIBLE);
}

void hideProgressView() {
    progressBar.setVisibility(View.INVISIBLE);
}

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