Reset color using image button

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

@@ -52,7 +52,7 @@ import android.widget.Button;
 import android.widget.CheckBox;
 import android.widget.CompoundButton;
 import android.widget.EditText;
-import android.widget.ImageView;
+import android.widget.ImageButton;
 import android.widget.RadioGroup;
 import android.widget.ScrollView;
 import android.widget.Spinner;
@@ -110,7 +110,7 @@ public class FragmentAccount extends FragmentBase {
     private EditText etName;
     private Button btnColor;
     private View vwColor;
-    private ImageView ibColorDefault;
+    private ImageButton ibColorDefault;
 
     private Button btnAdvanced;
     private CheckBox cbSynchronize;

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

@@ -42,7 +42,7 @@ import android.widget.Button;
 import android.widget.CheckBox;
 import android.widget.CompoundButton;
 import android.widget.EditText;
-import android.widget.ImageView;
+import android.widget.ImageButton;
 import android.widget.RadioGroup;
 import android.widget.ScrollView;
 import android.widget.Spinner;
@@ -83,7 +83,7 @@ public class FragmentIdentity extends FragmentBase {
     private EditText etDisplay;
     private Button btnColor;
     private View vwColor;
-    private ImageView ibColorDefault;
+    private ImageButton ibColorDefault;
     private EditText etSignature;
     private Button btnHtml;
 

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

@@ -39,6 +39,7 @@ import android.widget.ArrayAdapter;
 import android.widget.Button;
 import android.widget.CheckBox;
 import android.widget.EditText;
+import android.widget.ImageButton;
 import android.widget.ImageView;
 import android.widget.NumberPicker;
 import android.widget.ScrollView;
@@ -99,7 +100,7 @@ public class FragmentRule extends FragmentBase {
 
     private Button btnColor;
     private View vwColor;
-    private ImageView ibColorDefault;
+    private ImageButton ibColorDefault;
 
     private Spinner spTarget;
     private CheckBox cbMoveSeen;

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

@@ -336,11 +336,12 @@
                 app:layout_constraintStart_toEndOf="@id/btnColor"
                 app:layout_constraintTop_toTopOf="@id/btnColor" />
 
-            <ImageView
+            <ImageButton
                 android:id="@+id/ibColorDefault"
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"
                 android:layout_marginStart="12dp"
+                android:background="@null"
                 android:contentDescription="@string/title_legend_default_color"
                 android:src="@drawable/baseline_delete_24"
                 app:layout_constraintBottom_toBottomOf="@id/btnColor"

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

@@ -129,11 +129,12 @@
                 app:layout_constraintStart_toEndOf="@id/btnColor"
                 app:layout_constraintTop_toTopOf="@id/btnColor" />
 
-            <ImageView
+            <ImageButton
                 android:id="@+id/ibColorDefault"
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"
                 android:layout_marginStart="12dp"
+                android:background="@null"
                 android:contentDescription="@string/title_legend_default_color"
                 android:src="@drawable/baseline_delete_24"
                 app:layout_constraintBottom_toBottomOf="@id/btnColor"

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

@@ -409,11 +409,12 @@
                 app:layout_constraintStart_toEndOf="@id/btnColor"
                 app:layout_constraintTop_toTopOf="@id/btnColor" />
 
-            <ImageView
+            <ImageButton
                 android:id="@+id/ibColorDefault"
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"
                 android:layout_marginStart="12dp"
+                android:background="@null"
                 android:contentDescription="@string/title_legend_default_color"
                 android:src="@drawable/baseline_delete_24"
                 app:layout_constraintBottom_toBottomOf="@id/btnColor"