Refactoring

app/src/main/java/eu/faircode/email/FragmentAccount.java

@@ -91,7 +91,7 @@ public class FragmentAccount extends FragmentBase {
     private EditText etRealm;
 
     private EditText etName;
-    private ButtonColor btnColor;
+    private ViewButtonColor btnColor;
     private TextView tvColorPro;
 
     private Button btnAdvanced;

app/src/main/java/eu/faircode/email/FragmentIdentity.java

@@ -82,7 +82,7 @@ public class FragmentIdentity extends FragmentBase {
     private Spinner spAccount;
 
     private EditText etDisplay;
-    private ButtonColor btnColor;
+    private ViewButtonColor btnColor;
     private TextView tvColorPro;
     private EditText etSignature;
     private Button btnHtml;

app/src/main/java/eu/faircode/email/FragmentPop.java

@@ -67,7 +67,7 @@ public class FragmentPop extends FragmentBase {
     private TextInputLayout tilPassword;
 
     private EditText etName;
-    private ButtonColor btnColor;
+    private ViewButtonColor btnColor;
     private TextView tvColorPro;
 
     private CheckBox cbSynchronize;

app/src/main/java/eu/faircode/email/FragmentRule.java

@@ -110,7 +110,7 @@ public class FragmentRule extends FragmentBase {
     private NumberPicker npDuration;
     private CheckBox cbScheduleEnd;
 
-    private ButtonColor btnColor;
+    private ViewButtonColor btnColor;
 
     private Spinner spTarget;
     private CheckBox cbMoveSeen;

app/src/main/java/eu/faircode/email/ViewButtonColor.java

@@ -30,18 +30,18 @@ import android.view.View;
 import androidx.appcompat.widget.AppCompatButton;
 import androidx.core.graphics.ColorUtils;
 
-public class ButtonColor extends AppCompatButton {
+public class ViewButtonColor extends AppCompatButton {
     private int color = Color.TRANSPARENT;
 
-    public ButtonColor(Context context) {
+    public ViewButtonColor(Context context) {
         super(context);
     }
 
-    public ButtonColor(Context context, AttributeSet attrs) {
+    public ViewButtonColor(Context context, AttributeSet attrs) {
         super(context, attrs);
     }
 
-    public ButtonColor(Context context, AttributeSet attrs, int defStyleAttr) {
+    public ViewButtonColor(Context context, AttributeSet attrs, int defStyleAttr) {
         super(context, attrs, defStyleAttr);
     }
 

app/src/main/res/layout/fragment_account.xml

@@ -320,7 +320,7 @@
             app:layout_constraintStart_toStartOf="parent"
             app:layout_constraintTop_toBottomOf="@id/etName" />
 
-        <eu.faircode.email.ButtonColor
+        <eu.faircode.email.ViewButtonColor
             android:id="@+id/btnColor"
             style="@style/buttonStyleSmall"
             android:layout_width="wrap_content"

app/src/main/res/layout/fragment_identity.xml

@@ -114,7 +114,7 @@
             app:layout_constraintStart_toStartOf="parent"
             app:layout_constraintTop_toBottomOf="@id/etDisplay" />
 
-        <eu.faircode.email.ButtonColor
+        <eu.faircode.email.ViewButtonColor
             android:id="@+id/btnColor"
             style="@style/buttonStyleSmall"
             android:layout_width="wrap_content"

app/src/main/res/layout/fragment_pop.xml

@@ -194,7 +194,7 @@
             app:layout_constraintStart_toStartOf="parent"
             app:layout_constraintTop_toBottomOf="@id/etName" />
 
-        <eu.faircode.email.ButtonColor
+        <eu.faircode.email.ViewButtonColor
             android:id="@+id/btnColor"
             style="@style/buttonStyleSmall"
             android:layout_width="wrap_content"

app/src/main/res/layout/fragment_rule.xml

@@ -496,7 +496,7 @@
                     app:layout_constraintStart_toStartOf="parent"
                     app:layout_constraintTop_toBottomOf="@id/cbScheduleEnd" />
 
-                <eu.faircode.email.ButtonColor
+                <eu.faircode.email.ViewButtonColor
                     android:id="@+id/btnColor"
                     style="@style/buttonStyleSmall"
                     android:layout_width="wrap_content"