moved static functions to util class

app/src/main/java/org/kiwix/kiwixmobile/settings/KiwixSettingsActivity.java

@@ -52,6 +52,7 @@ import org.kiwix.kiwixmobile.database.RecentSearchDao;
 import org.kiwix.kiwixmobile.utils.LanguageUtils;
 import org.kiwix.kiwixmobile.utils.StyleUtils;
 import org.kiwix.kiwixmobile.views.SliderPreference;
+import org.kiwix.kiwixmobile.zim_manager.library_view.LibraryUtils;
 
 import static org.kiwix.kiwixmobile.utils.StyleUtils.dialogStyle;
 
@@ -165,7 +166,7 @@ public class KiwixSettingsActivity extends AppCompatActivity {
           getPrefrence(PREF_STORAGE).setTitle(PreferenceManager.getDefaultSharedPreferences(getActivity())
               .getString(KiwixMobileActivity.PREF_STORAGE_TITLE, "External"));
         }
-        getPrefrence(PREF_STORAGE).setSummary(LibraryFragment.bytesToHuman( new File(PreferenceManager.getDefaultSharedPreferences(getActivity())
+        getPrefrence(PREF_STORAGE).setSummary(LibraryUtils.bytesToHuman( new File(PreferenceManager.getDefaultSharedPreferences(getActivity())
             .getString(KiwixMobileActivity.PREF_STORAGE, Environment.getExternalStorageDirectory().getPath())).getFreeSpace()));
       }
     }

app/src/main/java/org/kiwix/kiwixmobile/zim_manager/library_view/LibraryFragment.java

@@ -219,7 +219,7 @@ public class LibraryFragment extends Fragment
         < Long.parseLong(((Book) (parent.getAdapter().getItem(position))).getSize()) * 1024f) {
       Toast.makeText(super.getActivity(), getString(R.string.download_no_space)
           + "\n" + getString(R.string.space_available) + " "
-          + bytesToHuman(getSpaceAvailable()), Toast.LENGTH_LONG).show();
+          + LibraryUtils.bytesToHuman(getSpaceAvailable()), Toast.LENGTH_LONG).show();
       Snackbar snackbar = Snackbar.make(libraryList,
           getString(R.string.download_change_storage),
           Snackbar.LENGTH_LONG)
@@ -271,44 +271,6 @@ public class LibraryFragment extends Fragment
     }
   }
 
-  public static String bytesToHuman(long size) {
-    long KB = 1024;
-    long MB = KB * 1024;
-    long GB = MB * 1024;
-    long TB = GB * 1024;
-    long PB = TB * 1024;
-    long EB = PB * 1024;
-
-    if (size < KB) {
-      return size + " Bytes";
-    }
-    if (size >= KB && size < MB) {
-      return round3SF((double) size / KB) + " KB";
-    }
-    if (size >= MB && size < GB) {
-      return round3SF((double) size / MB) + " MB";
-    }
-    if (size >= GB && size < TB) {
-      return round3SF((double) size / GB) + " GB";
-    }
-    if (size >= TB && size < PB) {
-      return round3SF((double) size / TB) + " TB";
-    }
-    if (size >= PB && size < EB) {
-      return round3SF((double) size / PB) + " PB";
-    }
-    if (size >= EB) {
-      return round3SF((double) size / EB) + " EB";
-    }
-
-    return "???";
-  }
-
-  public static String round3SF(double size) {
-    BigDecimal bd = new BigDecimal(size);
-    bd = bd.round(new MathContext(3));
-    return String.valueOf(bd.doubleValue());
-  }
 
   public void mobileDownloadDialog(int position, AdapterView<?> parent) {
     new AlertDialog.Builder(super.getActivity(), dialogStyle())

app/src/main/java/org/kiwix/kiwixmobile/zim_manager/library_view/LibraryUtils.java

@@ -1,9 +1,5 @@
 package org.kiwix.kiwixmobile.zim_manager.library_view;
 
-import android.net.ConnectivityManager;
-import android.net.NetworkInfo;
-import android.os.Build;
-
 import java.math.BigDecimal;
 import java.math.MathContext;
 
@@ -11,7 +7,7 @@ import java.math.MathContext;
  * Created by EladKeyshawn on 06/04/2017.
  */
 
-public class UtilFunctions {
+public class LibraryUtils {
   public static String bytesToHuman(long size) {
     long KB = 1024;
     long MB = KB * 1024;