change HttpsEditText to generic PrefixEditText

OpenKeychain/src/main/res/layout/linked_create_https_fragment_step1.xml

@@ -1,5 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:custom="http://schemas.android.com/apk/res-auto"
     android:layout_width="wrap_content"
     android:layout_height="match_parent">
 
@@ -37,7 +38,7 @@
                 android:textAppearance="?android:attr/textAppearanceMedium"
                 android:text="@string/linked_create_https_1_3" />
 
-            <org.sufficientlysecure.keychain.ui.widget.HttpsPrefixedText
+            <org.sufficientlysecure.keychain.ui.widget.PrefixedEditText
                 android:id="@+id/linked_create_https_uri"
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"
@@ -46,6 +47,7 @@
                 android:ems="10"
                 android:inputType="textUri"
                 android:layout_gravity="center_horizontal"
+                custom:prefix="https://"
                 />
 
             <TextView

OpenKeychain/src/main/res/layout/linked_create_twitter_fragment_step1.xml

@@ -1,7 +1,9 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:custom="http://schemas.android.com/apk/res-auto"
     android:layout_width="wrap_content"
-    android:layout_height="match_parent">
+    android:layout_height="match_parent"
+    >
 
     <ScrollView
         android:layout_width="match_parent"
@@ -37,7 +39,7 @@
                 android:textAppearance="?android:attr/textAppearanceMedium"
                 android:text="@string/linked_create_twitter_1_3" />
 
-            <EditText
+            <org.sufficientlysecure.keychain.ui.widget.PrefixedEditText
                 android:id="@+id/linked_create_twitter_handle"
                 android:layout_width="match_parent"
                 android:layout_height="wrap_content"
@@ -45,7 +47,9 @@
                 android:layout_marginTop="16dp"
                 android:ems="10"
                 android:layout_gravity="center_horizontal"
-                android:hint="@string/linked_create_twitter_handle"/>
+                android:hint="@string/linked_create_twitter_handle"
+                custom:prefix="\@"
+                />
 
         </LinearLayout>
 

OpenKeychain/src/main/res/values/attr.xml

@@ -29,4 +29,8 @@
         <attr name="color_strong" format="color" />
     </declare-styleable>
 
+    <declare-styleable name="PrefixedEditText">
+        <attr name="prefix" format="string" />
+    </declare-styleable>
+
 </resources>