Support for direct photo capture from app.

Make the send button toggle to an attach button when the
compose text and attachments are emmpty.

Part of #520
Closes #3186

// FREEBIE

res/layout/conversation_activity.xml

@@ -97,19 +97,37 @@
                         android:contentDescription="@string/conversation_activity__compose_description"
                         android:textColor="?conversation_editor_text_color" />
 
-                <org.thoughtcrime.securesms.components.SendButton
-                    android:id="@+id/send_button"
-                    android:layout_width="wrap_content"
-                    android:layout_height="fill_parent"
-                    android:layout_gravity="center_vertical"
-                    android:background="@drawable/touch_highlight_background"
-                    android:contentDescription="@string/conversation_activity__send"
-                    android:nextFocusLeft="@+id/embedded_text_editor"
-                    android:padding="12dp"
-                    android:src="?conversation_transport_sms_indicator"
-                    android:focusable="true"
-                    android:clickable="false"
-                    android:enabled="false" />
+                <org.thoughtcrime.securesms.components.AnimatingToggle
+                        android:id="@+id/button_toggle"
+                        android:layout_width="wrap_content"
+                        android:layout_height="wrap_content">
+
+                    <ImageButton
+                            android:id="@+id/attach_button"
+                            android:layout_gravity="center_vertical"
+                            android:background="@drawable/touch_highlight_background"
+                            android:padding="12dp"
+                            android:src="?conversation_attach_file"
+                            android:contentDescription="@string/ConversationActivity_add_attachment"
+                            android:nextFocusLeft="@+id/embedded_text_editor"
+                            android:layout_width="wrap_content"
+                            android:layout_height="fill_parent"/>
+
+                    <org.thoughtcrime.securesms.components.SendButton
+                            android:id="@+id/send_button"
+                            android:layout_width="wrap_content"
+                            android:layout_height="fill_parent"
+                            android:layout_gravity="center_vertical"
+                            android:background="@drawable/touch_highlight_background"
+                            android:contentDescription="@string/conversation_activity__send"
+                            android:nextFocusLeft="@+id/embedded_text_editor"
+                            android:padding="12dp"
+                            android:src="?conversation_transport_sms_indicator"
+                            android:focusable="true"
+                            android:clickable="false"
+                            android:enabled="false" />
+
+                </org.thoughtcrime.securesms.components.AnimatingToggle>
 
             </LinearLayout>
 

res/values/attrs.xml

@@ -37,6 +37,7 @@
     <attr name="conversation_attach_video" format="reference"/>
     <attr name="conversation_attach_sound" format="reference"/>
     <attr name="conversation_attach_contact_info" format="reference"/>
+    <attr name="conversation_attach_photo" format="reference"/>
 
     <attr name="conversation_item_background" format="reference"/>
     <attr name="conversation_item_received_background" format="reference" />

res/values/strings.xml

@@ -50,6 +50,7 @@
     <string name="AttachmentManager_cant_open_media_selection">Can\'t find an app to select media.</string>
 
     <!-- AttachmentTypeSelectorAdapter -->
+    <string name="AttachmentTypeSelectorAdapter_take_photo">Take Photo</string>
     <string name="AttachmentTypeSelectorAdapter_picture">Picture</string>
     <string name="AttachmentTypeSelectorAdapter_video">Video</string>
     <string name="AttachmentTypeSelectorAdapter_audio">Audio</string>

res/values/themes.xml

@@ -53,6 +53,7 @@
         <item name="conversation_attach_video">@drawable/ic_movie_creation_light</item>
         <item name="conversation_attach_sound">@drawable/ic_volume_up_light</item>
         <item name="conversation_attach_contact_info">@drawable/ic_account_box_light</item>
+        <item name="conversation_attach_photo">@drawable/ic_photo_camera_light</item>
 
         <item name="conversation_item_background">@drawable/conversation_item_background</item>
         <item name="conversation_item_received_background">@color/conversation_item_received_background_light</item>
@@ -188,6 +189,7 @@
         <item name="conversation_attach_video">@drawable/ic_movie_creation_dark</item>
         <item name="conversation_attach_sound">@drawable/ic_volume_up_dark</item>
         <item name="conversation_attach_contact_info">@drawable/ic_account_box_dark</item>
+        <item name="conversation_attach_photo">@drawable/ic_photo_camera_dark</item>
 
         <item name="menu_new_conversation_icon">@drawable/ic_add_white_24dp</item>
         <item name="menu_group_icon">@drawable/ic_group_white_24dp</item>