ClarifaiUtil

package com.example.naris.brynmedicalassistant.ComputerVisionJF;

import android.app.Activity;
import android.content.Context;
import android.content.ContextWrapper;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.view.View;
import android.view.ViewGroup;

import java.io.ByteArrayOutputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

public final class ClarifaiUtil {

        private ClarifaiUtil() {
            throw new UnsupportedOperationException("No instances");
        }

        /**
         * @param context
         * @param data
         * @return
         */
        @Nullable
        public static byte[] retrieveSelectedImage(@NonNull Context context, @NonNull Intent data) {
            InputStream inStream = null;
            Bitmap bitmap = null;
            try {
                inStream = context.getContentResolver().openInputStream(data.getData());
                bitmap = BitmapFactory.decodeStream(inStream);
                final ByteArrayOutputStream outStream = new ByteArrayOutputStream();
                bitmap.compress(Bitmap.CompressFormat.JPEG, 100, outStream);
                return outStream.toByteArray();
            } catch (FileNotFoundException e) {
                return null;
            } finally {
                if (inStream != null) {
                    try {
                        inStream.close();
                    } catch (IOException ignored) {
                    }
                }
                if (bitmap != null) {
                    bitmap.recycle();
                }
            }
        }

        @NonNull
        public static Activity unwrapActivity(@NonNull Context startFrom) {
            while (startFrom instanceof ContextWrapper) {
                if (startFrom instanceof Activity) {
                    return ((Activity) startFrom);
                }
                startFrom = ((ContextWrapper) startFrom).getBaseContext();
            }
            throw new IllegalStateException("This Context can't be unwrapped to an Activity!");
        }

        @Nullable
        public static <T> T firstChildOfType(@NonNull View root, @NonNull Class<T> type) {
            if (type.isInstance(root)) {
                return type.cast(root);
            }
            if (root instanceof ViewGroup) {
                final ViewGroup rootGroup = (ViewGroup) root;
                for (int i = 0; i < rootGroup.getChildCount(); i++) {
                    final View child = rootGroup.getChildAt(i);
                    final T childResult = firstChildOfType(child, type);
                    if (childResult != null) {
                        return childResult;
                    }
                }
            }
            return null;
        }

        @NonNull
        public static <T> List<T> childrenOfType(@NonNull View root, @NonNull Class<T> type) {
            final List<T> children = new ArrayList<>();
            if (type.isInstance(root)) {
                children.add(type.cast(root));
            }
            if (root instanceof ViewGroup) {
                final ViewGroup rootGroup = (ViewGroup) root;
                for (int i = 0; i < rootGroup.getChildCount(); i++) {
                    final View child = rootGroup.getChildAt(i);
                    children.addAll(childrenOfType(child, type));
                }
            }
            return children;
        }
}