Pretty up the attachment drawer a little.

1) Rounded corners on the image.

2) A circle X on top of the image, rather than a remove button.

3) Quick 200ms fade on clear.

Closes #3439
// FREEBIE

res/drawable/conversation_attachment_close_circle.xml

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
+    <item>
+        <shape android:shape="oval">
+            <size android:height="24dp" android:width="24dp"/>
+            <solid android:color="@color/white"/>
+        </shape>
+    </item>
+    <item>
+        <shape android:shape="oval">
+            <size android:height="21dp" android:width="21dp"/>
+            <solid android:color="@color/textsecure_primary_dark"/>
+            <stroke android:color="@android:color/transparent"
+                    android:width="3dp"/>
+        </shape>
+    </item>
+    <item>
+        <bitmap android:src="@drawable/ic_clear_white_24dp"
+                android:gravity="center" />
+    </item>
+</layer-list>

res/layout/conversation_activity.xml

@@ -3,6 +3,7 @@
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
               android:layout_width="fill_parent"
               android:layout_height="fill_parent"
+              xmlns:app="http://schemas.android.com/apk/res-auto"
               android:orientation="vertical">
 
     <RelativeLayout
@@ -28,35 +29,34 @@
             <ScrollView android:layout_width="fill_parent"
                         android:layout_height="0dp"
                         android:layout_weight="1">
-                <LinearLayout
+                <FrameLayout
                         android:id="@+id/attachment_editor"
-                        android:layout_width="fill_parent"
+                        android:layout_width="wrap_content"
                         android:layout_height="wrap_content"
-                        android:orientation="horizontal"
+                        android:layout_gravity="center_horizontal"
                         android:visibility="gone">
 
+                    <FrameLayout
+                            android:paddingLeft="10dp"
+                            android:paddingTop="10dp"
+                            android:layout_width="fill_parent"
+                            android:layout_height="fill_parent">
+
                         <org.thoughtcrime.securesms.components.ThumbnailView
                                 android:id="@+id/attachment_thumbnail"
-                            android:layout_width="0dp"
-                            android:layout_height="150dip"
-                            android:layout_weight="1"
-                            android:contentDescription="@string/conversation_activity__attachment_thumbnail"/>
-
-                    <LinearLayout
-                            android:orientation="vertical"
                                 android:layout_width="wrap_content"
-                            android:layout_height="fill_parent"
+                                android:layout_height="150dip"
-                            android:gravity="center_vertical">
+                                app:riv_corner_radius="3dp"
+                                android:contentDescription="@string/conversation_activity__attachment_thumbnail"/>
+                    </FrameLayout>
 
-                        <Button
+                    <ImageView android:id="@+id/remove_image_button"
-                                android:id="@+id/remove_image_button"
+                               android:layout_width="wrap_content"
-                                style="?android:attr/buttonStyleSmall"
+                               android:layout_height="wrap_content"
-                                android:layout_width="100dip"
+                               android:src="@drawable/conversation_attachment_close_circle"
-                                android:layout_height="50dip"
+                               android:layout_gravity="top|left"/>
-                                android:text="@string/conversation_activity__remove" />
 
-                    </LinearLayout>
+               </FrameLayout>
-               </LinearLayout>
             </ScrollView>
 
             <View android:layout_width="match_parent"

src/org/thoughtcrime/securesms/mms/AttachmentManager.java

@@ -26,7 +26,12 @@ import android.provider.ContactsContract;
 import android.provider.MediaStore;
 import android.util.Log;
 import android.view.View;
+import android.view.animation.AlphaAnimation;
+import android.view.animation.Animation;
+import android.view.animation.ScaleAnimation;
 import android.widget.Button;
+import android.widget.ImageButton;
+import android.widget.ImageView;
 import android.widget.Toast;
 
 import org.thoughtcrime.securesms.R;
@@ -42,7 +47,7 @@ public class AttachmentManager {
   private final Context            context;
   private final View               attachmentView;
   private final ThumbnailView      thumbnail;
-  private final Button             removeButton;
+  private final ImageView          removeButton;
   private final SlideDeck          slideDeck;
   private final AttachmentListener attachmentListener;
 
@@ -51,7 +56,7 @@ public class AttachmentManager {
   public AttachmentManager(Activity view, AttachmentListener listener) {
     this.attachmentView     = view.findViewById(R.id.attachment_editor);
     this.thumbnail          = (ThumbnailView)view.findViewById(R.id.attachment_thumbnail);
-    this.removeButton       = (Button)view.findViewById(R.id.remove_image_button);
+    this.removeButton       = (ImageView)view.findViewById(R.id.remove_image_button);
     this.slideDeck          = new SlideDeck();
     this.context            = view;
     this.attachmentListener = listener;
@@ -60,11 +65,30 @@ public class AttachmentManager {
   }
 
   public void clear() {
+    AlphaAnimation animation = new AlphaAnimation(1.0f, 0.0f);
+    animation.setDuration(200);
+    animation.setAnimationListener(new Animation.AnimationListener() {
+      @Override
+      public void onAnimationStart(Animation animation) {
+
+      }
+
+      @Override
+      public void onAnimationEnd(Animation animation) {
         slideDeck.clear();
         attachmentView.setVisibility(View.GONE);
         attachmentListener.onAttachmentChanged();
       }
 
+      @Override
+      public void onAnimationRepeat(Animation animation) {
+
+      }
+    });
+
+    attachmentView.startAnimation(animation);
+  }
+
   public void cleanup() {
     if (captureFile != null) captureFile.delete();
     captureFile = null;