Add button to view password, fix #145

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

@@ -3,9 +3,9 @@
     xmlns:app="http://schemas.android.com/apk/res-auto"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
+    android:orientation="vertical"
     android:focusable="true"
     android:focusableInTouchMode="true"
-    android:orientation="vertical"
     android:weightSum="2">
 
 
@@ -55,7 +55,8 @@
 
         <android.support.design.widget.TextInputLayout
             android:layout_width="match_parent"
-            android:layout_height="wrap_content">
+            android:layout_height="wrap_content"
+            app:passwordToggleEnabled="true">
 
             <android.support.design.widget.TextInputEditText
                 android:id="@+id/login_password"