style: make utility classes proper utilities

core/src/androidTest/java/com/cloudinary/android/TestUtils.java

@@ -8,7 +8,9 @@
 import java.lang.reflect.Field;
 import java.util.Map;
 
-public class TestUtils {
+public final class TestUtils {
+    private TestUtils() {}
+
     public static AbstractUploaderStrategy replaceWithTimeoutStrategy(Cloudinary cloudinary) throws NoSuchFieldException, IllegalAccessException, IOException {
         return TestUtils.replaceStrategyForIntsance(cloudinary, new AbstractUploaderStrategy() {
 

core/src/main/java/com/cloudinary/android/BackgroundStrategyProvider.java

@@ -1,6 +1,8 @@
 package com.cloudinary.android;
 
-class BackgroundStrategyProvider {
+final class BackgroundStrategyProvider {
+    private BackgroundStrategyProvider() {}
+
     static BackgroundRequestStrategy provideStrategy(){
         return new AndroidJobStrategy();
     }

core/src/main/java/com/cloudinary/android/Logger.java

@@ -2,7 +2,9 @@
 
 import android.util.Log;
 
-public class Logger {
+public final class Logger {
+    private Logger() {}
+
     static LogLevel logLevel = LogLevel.ERROR;
 
     public static void i(String tag, String message) {

core/src/main/java/com/cloudinary/android/Utils.java

@@ -5,7 +5,9 @@
 import android.content.pm.PackageManager;
 import android.content.pm.PackageManager.NameNotFoundException;
 
-public class Utils {
+public final class Utils {
+    private Utils() {}
+
     public static String cloudinaryUrlFromContext(Context context) {
         String url = "";
         try {

core/src/main/java/com/cloudinary/android/payload/PayloadFactory.java

@@ -5,7 +5,9 @@
 /**
  * This class is used to construct Payload instances from URIs.
  */
-public class PayloadFactory {
+public final class PayloadFactory {
+    private PayloadFactory() {}
+
     private static final String TAG = PayloadFactory.class.getSimpleName();
 
     /**

sample/src/main/java/com/cloudinary/sample/helpers/CloudinaryHelper.java

@@ -7,7 +7,8 @@
 import java.util.HashMap;
 import java.util.Map;
 
-public class CloudinaryHelper {
+public final class CloudinaryHelper {
+    private CloudinaryHelper() {}
 
     public static void setMediaManager(Context context, String cloudName) {
         Map config = new HashMap();

sample/src/main/java/com/cloudinary/sample/helpers/StringHelper.java

@@ -1,6 +1,7 @@
 package com.cloudinary.sample.helpers;
 
-public class StringHelper {
+public final class StringHelper {
+    private StringHelper() {}
 
     public static String captialLetter(String input) {
 

sample/src/main/java/com/cloudinary/sample/helpers/Utils.java

@@ -6,7 +6,8 @@
 import android.graphics.drawable.BitmapDrawable;
 import android.graphics.drawable.Drawable;
 
-public class Utils {
+public final class Utils {
+    private Utils() {}
 
     public static String UPLOAD_PRESET = "android_sample";
     public static String getImageWidhtAndHeightString(Drawable drawable) {

ui/src/main/java/com/cloudinary/android/uploadwidget/UploadWidget.java

@@ -21,7 +21,8 @@
 /**
  * Helper class to start the UploadWidget and preprocess its results.
  */
-public class UploadWidget {
+public final class UploadWidget {
+    private UploadWidget() {}
 
     /**
      * The key used to pass upload widget result data back from {@link UploadWidgetActivity}.

ui/src/main/java/com/cloudinary/android/uploadwidget/UploadWidgetResultProcessor.java

@@ -12,7 +12,8 @@
 import com.cloudinary.android.uploadwidget.utils.MediaType;
 import com.cloudinary.android.uploadwidget.utils.UriUtils;
 
-class UploadWidgetResultProcessor {
+final class UploadWidgetResultProcessor {
+    private UploadWidgetResultProcessor() {}
 
     static UploadRequest process(Context context, UploadWidget.Result result) {
         UploadRequest uploadRequest = MediaManager.get().upload(result.uri);

ui/src/main/java/com/cloudinary/android/uploadwidget/utils/BitmapUtils.java

@@ -11,7 +11,8 @@
 import java.io.IOException;
 import java.io.InputStream;
 
-public class BitmapUtils {
+public final class BitmapUtils {
+    private BitmapUtils() {}
 
     /**
      * Decode a sampled bitmap to the required width and height.

ui/src/main/java/com/cloudinary/android/uploadwidget/utils/UriUtils.java

@@ -8,7 +8,8 @@
 import androidx.annotation.NonNull;
 import android.webkit.MimeTypeMap;
 
-public class UriUtils {
+public final class UriUtils {
+    private UriUtils() {}
 
     /**
      * Get the media type of the Uri.