Merge the Share process of the two classes into one

A new class has been added in the util package: NewPipeTextViewHelper.
It shares the selected text of a TextView with ShareUtils#shareText (with the created shareSelectedTextWithShareUtils static method).
Only this static method can be used by other classes, other methods are private.

app/src/main/java/org/schabi/newpipe/util/NewPipeTextViewHelper.java

@@ -0,0 +1,86 @@
+package org.schabi.newpipe.util;
+
+import android.content.Context;
+import android.text.Selection;
+import android.text.Spannable;
+import android.widget.TextView;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+
+import org.schabi.newpipe.util.external_communication.ShareUtils;
+import org.schabi.newpipe.views.NewPipeEditText;
+import org.schabi.newpipe.views.NewPipeTextView;
+
+public final class NewPipeTextViewHelper {
+    private NewPipeTextViewHelper() {
+    }
+
+    /**
+     * Share the selected text of {@link NewPipeTextView NewPipeTextViews} and
+     * {@link NewPipeEditText NewPipeEditTexts} with
+     * {@link ShareUtils#shareText(Context, String, String)}.
+     *
+     * <p>
+     * This allows EMUI users to get the Android share sheet instead of the EMUI share sheet when
+     * using the {@code Share} command of the popup menu which appears when selecting text.
+     * </p>
+     *
+     * @param textView the {@link TextView} on which sharing the selected text. It should be a
+     *                 {@link NewPipeTextView} or a {@link NewPipeEditText} (even if
+     *                 {@link TextView standard TextViews} are supported).
+     *
+     * @return true if no exceptions occurred when getting the selected text, sharing it and
+     * deselecting it, otherwise an exception
+     */
+    public static boolean shareSelectedTextWithShareUtils(@NonNull final TextView textView) {
+        if (textView instanceof NewPipeTextView) {
+            final NewPipeTextView newPipeTextView = (NewPipeTextView) textView;
+            final CharSequence text = newPipeTextView.getText();
+            final CharSequence selectedText = getSelectedText(newPipeTextView, text);
+
+            shareSelectedTextIfNotNullAndNotEmpty(newPipeTextView, selectedText);
+
+            final Spannable spannable = (text instanceof Spannable) ? (Spannable) text : null;
+            Selection.setSelection(spannable, newPipeTextView.getSelectionEnd());
+        } else if (textView instanceof NewPipeEditText) {
+            final NewPipeEditText editText = (NewPipeEditText) textView;
+            final Spannable text = editText.getText();
+
+            final CharSequence selectedText = getSelectedText(textView, text);
+            shareSelectedTextIfNotNullAndNotEmpty(textView, selectedText);
+            Selection.setSelection(text, editText.getSelectionEnd());
+        } else {
+            final CharSequence text = textView.getText();
+            final CharSequence selectedText = getSelectedText(textView, text);
+
+            shareSelectedTextIfNotNullAndNotEmpty(textView, selectedText);
+
+            final Spannable spannable = (text instanceof Spannable) ? (Spannable) text : null;
+            Selection.setSelection(spannable, textView.getSelectionEnd());
+        }
+
+        return true;
+    }
+
+    @Nullable
+    private static CharSequence getSelectedText(@NonNull final TextView textView,
+                                               @Nullable final CharSequence text) {
+        if (!textView.hasSelection() || text == null) {
+            return null;
+        }
+
+        final int start = textView.getSelectionStart();
+        final int end = textView.getSelectionEnd();
+        return String.valueOf(start > end ? text.subSequence(end, start)
+                : text.subSequence(start, end));
+    }
+
+    private static void shareSelectedTextIfNotNullAndNotEmpty(
+            @NonNull final TextView textView,
+            @Nullable final CharSequence selectedText) {
+        if (selectedText != null && selectedText.length() != 0) {
+            ShareUtils.shareText(textView.getContext(), "", selectedText.toString());
+        }
+    }
+}

app/src/main/java/org/schabi/newpipe/views/NewPipeEditText.java

@@ -1,8 +1,6 @@
 package org.schabi.newpipe.views;
 
 import android.content.Context;
-import android.text.Selection;
-import android.text.Spannable;
 import android.util.AttributeSet;
 
 import androidx.annotation.NonNull;
@@ -11,6 +9,8 @@
 
 import org.schabi.newpipe.util.external_communication.ShareUtils;
 
+import static org.schabi.newpipe.util.NewPipeTextViewHelper.shareSelectedTextWithShareUtils;
+
 /**
  * An {@link AppCompatEditText} which uses {@link ShareUtils#shareText(Context, String, String)}
  * when sharing selected text by using the {@code Share} command of the floating actions.
@@ -38,27 +38,9 @@ public NewPipeEditText(@NonNull final Context context,
     @Override
     public boolean onTextContextMenuItem(final int id) {
         if (id == android.R.id.shareText) {
-            final Spannable text = getText();
-            final CharSequence selectedText = getSelectedText(text);
-            if (selectedText != null && selectedText.length() != 0) {
-                ShareUtils.shareText(getContext(), "", selectedText.toString());
-            }
-            Selection.setSelection(text, getSelectionEnd());
-            return true;
+            return shareSelectedTextWithShareUtils(this);
         } else {
             return super.onTextContextMenuItem(id);
         }
     }
-
-    @Nullable
-    private CharSequence getSelectedText(@Nullable final CharSequence text) {
-        if (!hasSelection() || text == null) {
-            return null;
-        }
-
-        final int start = getSelectionStart();
-        final int end = getSelectionEnd();
-        return String.valueOf(start > end ? text.subSequence(end, start)
-                : text.subSequence(start, end));
-    }
 }

app/src/main/java/org/schabi/newpipe/views/NewPipeTextView.java

@@ -1,8 +1,6 @@
 package org.schabi.newpipe.views;
 
 import android.content.Context;
-import android.text.Selection;
-import android.text.Spannable;
 import android.util.AttributeSet;
 
 import androidx.annotation.NonNull;
@@ -11,6 +9,8 @@
 
 import org.schabi.newpipe.util.external_communication.ShareUtils;
 
+import static org.schabi.newpipe.util.NewPipeTextViewHelper.shareSelectedTextWithShareUtils;
+
 /**
  * An {@link AppCompatTextView} which uses {@link ShareUtils#shareText(Context, String, String)}
  * when sharing selected text by using the {@code Share} command of the floating actions.
@@ -38,28 +38,9 @@ public NewPipeTextView(@NonNull final Context context,
     @Override
     public boolean onTextContextMenuItem(final int id) {
         if (id == android.R.id.shareText) {
-            final CharSequence text = getText();
-            final CharSequence selectedText = getSelectedText(text);
-            if (selectedText != null && selectedText.length() != 0) {
-                ShareUtils.shareText(getContext(), "", selectedText.toString());
-            }
-            final Spannable spannable = (text instanceof Spannable) ? (Spannable) text : null;
-            Selection.setSelection(spannable, getSelectionEnd());
-            return true;
+            return shareSelectedTextWithShareUtils(this);
         } else {
             return super.onTextContextMenuItem(id);
         }
     }
-
-    @Nullable
-    private CharSequence getSelectedText(@Nullable final CharSequence text) {
-        if (!hasSelection() || text == null) {
-            return null;
-        }
-
-        final int start = getSelectionStart();
-        final int end = getSelectionEnd();
-        return String.valueOf(start > end ? text.subSequence(end, start)
-                : text.subSequence(start, end));
-    }
 }