for creating something like this in android you can use alertDialog with custom layout and blur the background:
custom_layout

    <?xml version="1.0" encoding="utf-8"?>
    <LinearLayout xmlns_android="http://schemas.android.com/apk/res/android"
                  android_orientation="vertical"
                  android_paddingLeft="30dp"
                  android_paddingRight="30dp"
                  android_layout_width="match_parent"
                  android_layout_height="match_parent">
        <ImageView
            android_id="@+id/imageView"
            android_layout_width="match_parent"
            android_layout_height="wrap_content"/>
        <LinearLayout
                  android_orientation="horizontal"
                  android_paddingLeft="10dp"
                  android_paddingRight="10dp"
                  android_layout_width="match_parent"
                  android_layout_height="wrap_content">
        <Button
            android_id="@+id/button1"
            android:layout_below
            android_layout_width="wrap_content"
            android_layout_height="wrap_content"/>
        <Button
            android_id="@+id/button2"
            android_layout_width="wrap_content"
            android_layout_height="wrap_content"/>
        </LinearLayout>
     </LinearLayout>

in Activity:

        //create an alert builder
            AlertDialog.Builder builder = new AlertDialog.Builder(this);
            builder.setTitle("Name"); //you can add this to your custom layout only
        // set the custom layout
            final View view = getLayoutInflater().inflate(R.layout.custom_layout, null);
            builder.setView(view);
            Button button1 = (Button) view.findViewById(R.id.button1); // etc.. for button2,3,4.
        // onclick functions
        // create and show the alert dialog
            AlertDialog dialog = builder.create();
            dialog.show();

for blur background, you can add a theme like https://stackoverflow.com/a/41373144/7364284 but, I would suggest using window attributes like https://stackoverflow.com/a/10381077/7364284 because of its less code and easy to use.

I want to implement something like what instagram does here.
Upon long pressing on a post it opens up another view on top the screen to show the post and makes the remaining part of the screen blur.