I am new to android.I have a RecyclerView which shows list of images from a json.I want to do showing image full screen when item from RecyclerView clicks.Also it should be
follow this steps
create a new Activity like this and retrive url
LAYOUT
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">
    <ImageView
        android:id="@+id/myImage"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:adjustViewBounds="true"
        android:scaleType="fitXY" />
</LinearLayout>
Activity.java
public class MainActivity extends AppCompatActivity {
    ImageView myImage;
    String url = "";
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        url = getIntent().getStringExtra("image_url");
        myImage = findViewById(R.id.myImage);
        Glide.with(this).load(url)
                .placeholder(R.drawable.ic_launcher_background)
                .error(R.drawable.ic_launcher_background)
                .into(myImage);
    }
}
When use click om recyclerview item than pass the url to that activity using intent
 myHolder.imageView.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Intent intent= new Intent(context,MainActivity.this);
            intent.putExtra("image_url",current.flagimage);
            context.startActivity(intent);
        }
    });
you can use PhotoView for zooming
ImageView
PhotoView aims to help produce an easily usable implementation of a zooming Android ImageView.