Enlarge ImageView Android image

I'll put " cat jump " just because the example I made is very large:

I was using GridView to display all the images but you can have a imageView normal.

grid = (GridView) findViewById(R.id.gridview);

        adapter = new GridViewAdapter(this, FilePathStrings, FileNameStrings);

        grid.setAdapter(adapter);

        grid.setOnItemClickListener(new OnItemClickListener()
        {

            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id)
            {

                Intent i = new Intent(MainActivity.this, ViewImage.class);

                i.putExtra("filepath", FilePathStrings);                
                i.putExtra("filename", FileNameStrings);            
                i.putExtra("position", position);

                startActivity(i);
            }

        });

Here is the activity that will be started in the photo click:

public class ViewImage extends Activity {


    ImageView imageview;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        setContentView(R.layout.view_image);

        Intent i = getIntent(); 
        int position = i.getExtras().getInt("position");

        String[] filepath = i.getStringArrayExtra("filepath");

        imageview = (ImageView) findViewById(R.id.full_image_view);     

        Bitmap bmp = BitmapFactory.decodeFile(filepath[position]);

        imageview.setImageBitmap(bmp);

    }
}

Here is the full screen layout after clicking the photo:

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >

    <ImageView
        android:id="@+id/full_image_view"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true" />


</RelativeLayout>

This was my solution because I had a product description with an image of it below and needed the user to see the image in larger size, I only changed the GridView to ImageView when I was deploying.