Implement upload any type of file action

app/src/main/java/chat/rocket/android/fragment/chatroom/RoomFragment.java

@@ -22,6 +22,7 @@ import android.support.v7.widget.RecyclerView;
 import android.view.View;
 
 import chat.rocket.android.fragment.sidebar.SidebarMainFragment;
+import chat.rocket.android.layouthelper.extra_action.upload.FileUploadActionItem;
 import chat.rocket.android.widget.RoomToolbar;
 import chat.rocket.core.models.User;
 import java.lang.reflect.Field;
@@ -248,10 +249,11 @@ public class RoomFragment extends AbstractChatRoomFragment implements
   }
 
   private void setupMessageActions() {
-    extraActionItems = new ArrayList<>(3); // fixed number as of now
+    extraActionItems = new ArrayList<>(4); // fixed number as of now
     extraActionItems.add(new ImageUploadActionItem());
     extraActionItems.add(new AudioUploadActionItem());
     extraActionItems.add(new VideoUploadActionItem());
+    extraActionItems.add(new FileUploadActionItem());
   }
 
   private void scrollToLatestMessage() {

app/src/main/java/chat/rocket/android/layouthelper/extra_action/upload/FileUploadActionItem.java

+package chat.rocket.android.layouthelper.extra_action.upload;
+
+import android.content.Intent;
+
+import chat.rocket.android.R;
+
+public class FileUploadActionItem extends AbstractUploadActionItem {
+
+  @Override
+  public int getItemId() {
+    return 13;
+  }
+
+  @Override
+  protected Intent getIntentForPickFile() {
+    Intent intent = new Intent();
+    intent.setType("*/*");
+    intent.setAction(Intent.ACTION_GET_CONTENT);
+    return Intent.createChooser(intent, "Select File to Upload");
+  }
+
+  @Override
+  public int getIcon() {
+    return R.drawable.ic_insert_drive_file_white_24dp;
+  }
+
+  @Override
+  public int getTitle() {
+    return R.string.doc_upload_message_spec_title;
+  }
+}

app/src/main/res/drawable/ic_insert_drive_file_white_24dp.xml

+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+        android:width="24dp"
+        android:height="24dp"
+        android:viewportWidth="24.0"
+        android:viewportHeight="24.0">
+    <path
+        android:fillColor="#FFFFFFFF"
+        android:pathData="M6,2c-1.1,0 -1.99,0.9 -1.99,2L4,20c0,1.1 0.89,2 1.99,2L18,22c1.1,0 2,-0.9 2,-2L20,8l-6,-6L6,2zM13,9L13,3.5L18.5,9L13,9z"/>
+</vector>