Simplest ScrollView Parallax technique in Android. No library required and just with 4 lines of code, you can easily create parallax effect.

activity_parallax.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="@color/white"
    android:orientation="vertical">

    /* image to be parallaxed */
    <ImageView
        android:id="@+id/parallax_image"
        android:layout_width="match_parent"
        android:layout_height="280dp"
        android:scaleType="centerCrop"
        android:src="@drawable/img_user_avatar" />

    <ScrollView
        android:id="@+id/scrollView"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:clipToPadding="false"
        android:orientation="vertical">

        <TextView
            android:id="@+id/tv_perhour"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginTop="280dp"
            android:layout_weight="1"
            android:background="@color/white"
            android:gravity="left"
            android:text="@string/lorem_ipsum"
            android:textColor="@color/black"
            android:textSize="20sp" />

    </ScrollView>

</RelativeLayout>

ScrollParallaxActivity.java

/**
 * Created by Saurabh(aqua) in 2017.
 */

public class ParallaxActivity extends BaseActivity {

    /* view binding */
    @BindView(R.id.scrollView)ScrollView scrollView;
    @BindView(R.id.parallax_image)ImageView parallaxImage;
    @BindView(R.id.tv_perhour)TextView textView;
    /* color binding */
    @BindColor(R.color.white)int whiteColor;
    @BindColor(android.R.color.transparent)int transparentColor;

    int maxTexSize = 30;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        /* set scroll listener on scroll view */
        scrollView.getViewTreeObserver().addOnScrollChangedListener(new ViewTreeObserver.OnScrollChangedListener() {
            @Override
            public void onScrollChanged() {
                /* calculating the maximum distance we need to scroll for parallax */
                int maxDistance = parallaxImage.getHeight();
                /* getting the amount of scroll on Y-axis */
                int movement = scrollView.getScrollY();
                /* checking if we've reached the top. if yes then stop translation otherwise continue */
                if (movement >= 0 && movement <= maxDistance) {
                    /* moving the parallax image by half the distance of the total scroll */
                    parallaxImage.setTranslationY(-movement/2);
                }
            }
        });
    }

    /* this can be deleted in place of setContentView() in onCreate() */
    /* added for brevity */
    @Override
    protected int getActivityLayout() {
        return R.layout.activity_parallax;
    }
}

Thanks! It was helpful 👍