Media send fragment close button.

res/layout/mediasend_fragment.xml

@@ -153,4 +153,22 @@
 
     </org.thoughtcrime.securesms.components.InputAwareLayout>
 
+    <FrameLayout
+        android:id="@+id/mediasend_close_button"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_margin="@dimen/small_spacing"
+        android:padding="@dimen/small_spacing"
+        android:background="@drawable/circle_touch_highlight_background"
+        android:clickable="true"
+        android:focusable="true">
+
+        <ImageView
+            android:layout_width="36dp"
+            android:layout_height="36dp"
+            android:src="@drawable/ic_baseline_clear_24"
+            android:tint="@android:color/white"/>
+
+    </FrameLayout>
+
 </FrameLayout>

src/org/thoughtcrime/securesms/mediasend/MediaSendFragment.java

@@ -91,6 +91,7 @@ public class MediaSendFragment extends Fragment implements ViewTreeObserver.OnGl
   private Stub<MediaKeyboard> emojiDrawer;
   private ViewGroup         playbackControlsContainer;
   private TextView          charactersLeft;
+  private View              closeButton;
 
   private ControllableViewPager         fragmentPager;
   private MediaSendFragmentPagerAdapter fragmentPagerAdapter;
@@ -154,6 +155,7 @@ public class MediaSendFragment extends Fragment implements ViewTreeObserver.OnGl
     mediaRail                 = view.findViewById(R.id.mediasend_media_rail);
     playbackControlsContainer = view.findViewById(R.id.mediasend_playback_controls_container);
     charactersLeft            = view.findViewById(R.id.mediasend_characters_left);
+    closeButton               = view.findViewById(R.id.mediasend_close_button);
 
     View sendButtonBkg = view.findViewById(R.id.mediasend_send_button_bkg);
 
@@ -227,6 +229,8 @@ public class MediaSendFragment extends Fragment implements ViewTreeObserver.OnGl
     } else {
       emojiToggle.setOnClickListener(this::onEmojiToggleClicked);
     }
+
+    closeButton.setOnClickListener(v -> requireActivity().onBackPressed());
   }
 
   @Override