replace button with borderless image button + ripple effect + click binding

src/main/java/com/owncloud/android/ui/fragment/FileDetailActivitiesFragment.java

@@ -39,7 +39,7 @@ import android.support.v7.widget.RecyclerView;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
-import android.widget.Button;
+import android.widget.ImageButton;
 import android.widget.ImageView;
 import android.widget.LinearLayout;
 import android.widget.ProgressBar;
@@ -76,6 +76,7 @@ import java.util.ArrayList;
 import butterknife.BindString;
 import butterknife.BindView;
 import butterknife.ButterKnife;
+import butterknife.OnClick;
 import butterknife.Unbinder;
 
 public class FileDetailActivitiesFragment extends Fragment implements ActivityListInterface, VersionListInterface.View {
@@ -118,9 +119,6 @@ public class FileDetailActivitiesFragment extends Fragment implements ActivityLi
     @BindView(android.R.id.list)
     public RecyclerView recyclerView;
 
-    @BindView(R.id.submitComment)
-    public Button submitComment;
-
     @BindView(R.id.commentInputField)
     public TextInputEditText commentInput;
 
@@ -129,9 +127,11 @@ public class FileDetailActivitiesFragment extends Fragment implements ActivityLi
 
     @BindString(R.string.activities_no_results_message)
     public String noResultsMessage;
+
     private boolean restoreFileVersionSupported;
     private String userId;
     private FileOperationsHelper operationsHelper;
+    private VersionListInterface.CommentCallback callback;
 
     public static FileDetailActivitiesFragment newInstance(OCFile file, Account account) {
         FileDetailActivitiesFragment fragment = new FileDetailActivitiesFragment();
@@ -165,16 +165,14 @@ public class FileDetailActivitiesFragment extends Fragment implements ActivityLi
 
         fetchAndSetData(null);
 
-        swipeListRefreshLayout.setOnRefreshListener(
+        swipeListRefreshLayout.setOnRefreshListener(() -> onRefreshListLayout(swipeListRefreshLayout));
-                () -> onRefreshListLayout(swipeListRefreshLayout));
+        swipeEmptyListRefreshLayout.setOnRefreshListener(() -> onRefreshListLayout(swipeEmptyListRefreshLayout));
-        swipeEmptyListRefreshLayout.setOnRefreshListener(
-                () -> onRefreshListLayout(swipeEmptyListRefreshLayout));
 
         AccountManager accountManager = AccountManager.get(getContext());
         userId = accountManager.getUserData(account,
                 com.owncloud.android.lib.common.accounts.AccountUtils.Constants.KEY_USER_ID);
 
-        submitComment.setOnClickListener((l) -> submitComment(new VersionListInterface.CommentCallback() {
+        callback = new VersionListInterface.CommentCallback() {
 
             @Override
             public void onSuccess() {
@@ -186,16 +184,17 @@ public class FileDetailActivitiesFragment extends Fragment implements ActivityLi
             public void onError(int error) {
                 Snackbar.make(recyclerView, error, Snackbar.LENGTH_LONG).show();
             }
-        }));
+        };
 
         return view;
     }
 
-    private void submitComment(VersionListInterface.CommentCallback callback) {
+    @OnClick(R.id.submitComment)
-        String message = commentInput.getText().toString();
+    public void submitComment() {
-        new RestoreFileVersionTask.SubmitCommentTask(message, userId, file.getLocalId(), callback, ownCloudClient)
+        if (commentInput.getText().toString().trim().length() > 0) {
-                .execute();
+            new RestoreFileVersionTask.SubmitCommentTask(commentInput.getText().toString(), userId, file.getLocalId(),
-
+                    callback, ownCloudClient).execute();
+        }
     }
 
     private void onRefreshListLayout(SwipeRefreshLayout refreshLayout) {

src/main/res/drawable/ic_send.xml

@@ -0,0 +1,25 @@
+<!--
+    @author Google LLC
+    Copyright (C) 2018 Google LLC
+
+    Licensed under the Apache License, Version 2.0 (the "License");
+    you may not use this file except in compliance with the License.
+    You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+    Unless required by applicable law or agreed to in writing, software
+    distributed under the License is distributed on an "AS IS" BASIS,
+    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+    See the License for the specific language governing permissions and
+    limitations under the License.
+-->
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="24dp"
+    android:height="24dp"
+    android:viewportHeight="24"
+    android:viewportWidth="24">
+    <path
+        android:fillColor="#757575"
+        android:pathData="M2,21L23,12L2,3V10L17,12L2,14V21Z" />
+</vector>

src/main/res/layout/file_details_activities_fragment.xml

@@ -26,20 +26,33 @@
     <LinearLayout
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
+        android:layout_marginEnd="@dimen/zero"
+        android:layout_marginLeft="@dimen/standard_padding"
+        android:layout_marginRight="@dimen/zero"
+        android:layout_marginStart="@dimen/standard_padding"
         android:orientation="horizontal">
 
         <android.support.design.widget.TextInputEditText
             android:id="@+id/commentInputField"
-            android:layout_width="wrap_content"
+            android:layout_width="0dp"
             android:layout_height="wrap_content"
             android:layout_weight="1"
-            android:hint="@string/new_comment"/>
+            android:hint="@string/new_comment"
+            android:paddingTop="@dimen/standard_padding" />
 
-        <Button
+        <ImageButton
             android:id="@+id/submitComment"
             android:layout_width="wrap_content"
             android:layout_height="wrap_content"
-            android:text="→"/>
+            android:background="?attr/selectableItemBackgroundBorderless"
+            android:contentDescription="@string/common_send"
+            android:paddingBottom="@dimen/standard_padding"
+            android:paddingEnd="@dimen/standard_padding"
+            android:paddingLeft="@dimen/standard_padding"
+            android:paddingRight="@dimen/standard_padding"
+            android:paddingStart="@dimen/standard_padding"
+            android:paddingTop="@dimen/standard_padding"
+            android:src="@drawable/ic_send" />
     </LinearLayout>
 
     <android.support.v4.widget.SwipeRefreshLayout