Android: empty lists and loading error feedback

docs-android/app/src/main/java/com/sismics/docs/MainApplication.java

@@ -20,7 +20,7 @@ public class MainApplication extends Application {
         JSONObject json = PreferenceUtil.getCachedJson(getApplicationContext(), PreferenceUtil.PREF_CACHED_USER_INFO_JSON);
         ApplicationContext.getInstance().setUserInfo(getApplicationContext(), json);
 
-        // TODO Error feedback (all REST request, even login)
+        // TODO Documents list page loading feedback
         // TODO Fullscreen preview
         // TODO Caching preferences
         // TODO Edit sharing

docs-android/app/src/main/java/com/sismics/docs/activity/DocumentActivity.java

@@ -16,10 +16,10 @@ import android.view.View;
 import android.widget.ImageView;
 import android.widget.TextView;
 
-import com.loopj.android.http.JsonHttpResponseHandler;
 import com.sismics.docs.R;
 import com.sismics.docs.adapter.FilePagerAdapter;
 import com.sismics.docs.event.DocumentFullscreenEvent;
+import com.sismics.docs.listener.JsonHttpResponseHandler;
 import com.sismics.docs.model.application.ApplicationContext;
 import com.sismics.docs.resource.FileResource;
 import com.sismics.docs.util.PreferenceUtil;
@@ -139,14 +139,27 @@ public class DocumentActivity extends ActionBarActivity {
         sharedImageView.setVisibility(shared ? View.VISIBLE : View.GONE);
 
         // Grab the attached files
+        final View progressBar = findViewById(R.id.progressBar);
+        final TextView filesEmptyView = (TextView) findViewById(R.id.filesEmptyView);
+        fileViewPager = (ViewPager) findViewById(R.id.fileViewPager);
+        fileViewPager.setOffscreenPageLimit(1);
+
         FileResource.list(this, id, new JsonHttpResponseHandler() {
             @Override
             public void onSuccess(int statusCode, Header[] headers, JSONObject response) {
-                fileViewPager = (ViewPager) findViewById(R.id.fileViewPager);
+                JSONArray files = response.optJSONArray("files");
-                fileViewPager.setOffscreenPageLimit(1);
+                filePagerAdapter = new FilePagerAdapter(DocumentActivity.this, files);
-                filePagerAdapter = new FilePagerAdapter(DocumentActivity.this, response.optJSONArray("files"));
                 fileViewPager.setAdapter(filePagerAdapter);
-                findViewById(R.id.progressBar).setVisibility(View.GONE);
+
+                progressBar.setVisibility(View.GONE);
+                if (files.length() == 0) filesEmptyView.setVisibility(View.VISIBLE);
+            }
+
+            @Override
+            public void onAllFailure(int statusCode, Header[] headers, byte[] responseBytes, Throwable throwable) {
+                filesEmptyView.setText(R.string.error_loading_files);
+                progressBar.setVisibility(View.GONE);
+                filesEmptyView.setVisibility(View.VISIBLE);
             }
         });
     }

docs-android/app/src/main/java/com/sismics/docs/activity/LoginActivity.java

@@ -12,9 +12,9 @@ import android.widget.Button;
 import android.widget.EditText;
 
 import com.androidquery.AQuery;
-import com.loopj.android.http.JsonHttpResponseHandler;
 import com.sismics.docs.R;
 import com.sismics.docs.listener.CallbackListener;
+import com.sismics.docs.listener.JsonHttpResponseHandler;
 import com.sismics.docs.model.application.ApplicationContext;
 import com.sismics.docs.resource.UserResource;
 import com.sismics.docs.ui.form.Validator;
@@ -109,11 +109,11 @@ public class LoginActivity extends ActionBarActivity {
                         }
 
                         @Override
-                        public void onFailure(int statusCode, Header[] headers, String responseString, Throwable throwable) {
+                        public void onAllFailure(int statusCode, Header[] headers, byte[] responseBytes, Throwable throwable) {
                             loginForm.setVisibility(View.VISIBLE);
                             progressBar.setVisibility(View.GONE);
 
-                            if (responseString != null && responseString.contains("\"ForbiddenError\"")) {
+                            if (responseBytes != null && new String(responseBytes).contains("\"ForbiddenError\"")) {
                                 DialogUtil.showOkDialog(LoginActivity.this, R.string.login_fail_title, R.string.login_fail);
                             } else {
                                 DialogUtil.showOkDialog(LoginActivity.this, R.string.network_error_title, R.string.network_error);
@@ -167,9 +167,9 @@ public class LoginActivity extends ActionBarActivity {
                     startActivity(intent);
                     finish();
                 }
-                
+
                 @Override
-                public void onFailure(int statusCode, Header[] headers, String responseString, Throwable throwable) {
+                public void onAllFailure(int statusCode, Header[] headers, byte[] responseBytes, Throwable throwable) {
                     DialogUtil.showOkDialog(LoginActivity.this, R.string.network_error_title, R.string.network_error);
                     loginForm.setVisibility(View.VISIBLE);
                 }

docs-android/app/src/main/java/com/sismics/docs/activity/MainActivity.java

@@ -18,10 +18,10 @@ import android.widget.AdapterView;
 import android.widget.ListView;
 import android.widget.TextView;
 
-import com.loopj.android.http.JsonHttpResponseHandler;
 import com.sismics.docs.R;
 import com.sismics.docs.adapter.TagListAdapter;
 import com.sismics.docs.event.SearchEvent;
+import com.sismics.docs.listener.JsonHttpResponseHandler;
 import com.sismics.docs.model.application.ApplicationContext;
 import com.sismics.docs.provider.RecentSuggestionsProvider;
 import com.sismics.docs.resource.TagResource;
@@ -79,12 +79,20 @@ public class MainActivity extends ActionBarActivity {
         // Get tag list to fill the drawer
         final ListView tagListView = (ListView) findViewById(R.id.tagListView);
         final View tagProgressView = findViewById(R.id.tagProgressView);
-        final View tagEmptyView = findViewById(R.id.tagEmptyView);
+        final TextView tagEmptyView = (TextView) findViewById(R.id.tagEmptyView);
         tagListView.setEmptyView(tagProgressView);
         TagResource.stats(this, new JsonHttpResponseHandler() {
             @Override
             public void onSuccess(int statusCode, Header[] headers, JSONObject response) {
                 tagListView.setAdapter(new TagListAdapter(response.optJSONArray("stats")));
+                tagProgressView.setVisibility(View.GONE);
+                tagListView.setEmptyView(tagEmptyView);
+            }
+
+            @Override
+            public void onAllFailure(int statusCode, Header[] headers, byte[] responseBytes, Throwable throwable) {
+                tagEmptyView.setText(R.string.error_loading_tags);
+                tagProgressView.setVisibility(View.GONE);
                 tagListView.setEmptyView(tagEmptyView);
             }
         });

docs-android/app/src/main/java/com/sismics/docs/fragment/DocListFragment.java

@@ -8,15 +8,18 @@ import android.support.v7.widget.RecyclerView;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
+import android.widget.TextView;
+import android.widget.Toast;
 
-import com.loopj.android.http.JsonHttpResponseHandler;
 import com.sismics.docs.R;
 import com.sismics.docs.activity.DocumentActivity;
 import com.sismics.docs.adapter.DocListAdapter;
 import com.sismics.docs.event.SearchEvent;
+import com.sismics.docs.listener.JsonHttpResponseHandler;
 import com.sismics.docs.listener.RecyclerItemClickListener;
 import com.sismics.docs.resource.DocumentResource;
 import com.sismics.docs.ui.view.DividerItemDecoration;
+import com.sismics.docs.ui.view.EmptyRecyclerView;
 
 import org.apache.http.Header;
 import org.json.JSONObject;
@@ -27,6 +30,11 @@ import de.greenrobot.event.EventBus;
  * @author bgamard.
  */
 public class DocListFragment extends Fragment {
+    /**
+     * Recycler view.
+     */
+    private EmptyRecyclerView recyclerView;
+
     /**
      * Documents adapter.
      */
@@ -46,7 +54,7 @@ public class DocListFragment extends Fragment {
         View view = inflater.inflate(R.layout.doc_list_fragment, container, false);
 
         // Configure the RecyclerView
-        RecyclerView recyclerView = (RecyclerView) view.findViewById(R.id.docList);
+        recyclerView = (EmptyRecyclerView) view.findViewById(R.id.docList);
         adapter = new DocListAdapter();
         recyclerView.setAdapter(adapter);
         recyclerView.setHasFixedSize(true);
@@ -87,14 +95,14 @@ public class DocListFragment extends Fragment {
                     }
                 }
                 if (!loading && totalItemCount - visibleItemCount <= firstVisibleItem + 3) {
-                    loadDocuments(false);
+                    loadDocuments(getView(), false);
                     loading = true;
                 }
             }
         });
 
         // Grab the documents
-        loadDocuments(true);
+        loadDocuments(view, true);
 
         EventBus.getDefault().register(this);
         return view;
@@ -113,30 +121,43 @@ public class DocListFragment extends Fragment {
      */
     public void onEvent(SearchEvent event) {
         query = event.getQuery();
-        loadDocuments(true);
+        loadDocuments(getView(), true);
     }
 
     /**
      * Refresh the document list.
      *
+     * @param view View
      * @param reset If true, reload the documents
      */
-    private void loadDocuments(final boolean reset) {
+    private void loadDocuments(final View view, final boolean reset) {
+        if (view == null) return;
+        final View progressBar = view.findViewById(R.id.progressBar);
+        final TextView documentsEmptyView = (TextView) view.findViewById(R.id.documentsEmptyView);
+
         if (reset) {
             loading = true;
             previousTotal = 0;
             adapter.clearDocuments();
-            if (getView() != null) {
-                getView().findViewById(R.id.progressBar).setVisibility(View.VISIBLE);
-            }
         }
+        recyclerView.setEmptyView(progressBar);
 
         DocumentResource.list(getActivity(), reset ? 0 : adapter.getItemCount(), query, new JsonHttpResponseHandler() {
             @Override
             public void onSuccess(int statusCode, Header[] headers, JSONObject response) {
                 adapter.addDocuments(response.optJSONArray("documents"));
-                if (getView() != null) {
+                documentsEmptyView.setText(R.string.no_documents);
-                    getView().findViewById(R.id.progressBar).setVisibility(View.GONE);
+                recyclerView.setEmptyView(documentsEmptyView);
+            }
+
+            @Override
+            public void onAllFailure(int statusCode, Header[] headers, byte[] responseBytes, Throwable throwable) {
+                documentsEmptyView.setText(R.string.error_loading_documents);
+                recyclerView.setEmptyView(documentsEmptyView);
+
+                if (!reset) {
+                    // We are loading a new page, so the empty view won't be visible, pop a toast
+                    Toast.makeText(getActivity(), R.string.error_loading_documents, Toast.LENGTH_SHORT).show();
                 }
             }
         });

docs-android/app/src/main/java/com/sismics/docs/listener/JsonHttpResponseHandler.java

@@ -0,0 +1,241 @@
+/*
+    Android Asynchronous Http Client
+    Copyright (c) 2011 James Smith <james@loopj.com>
+    http://loopj.com
+
+    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.
+*/
+
+package com.sismics.docs.listener;
+
+import android.util.Log;
+
+import com.loopj.android.http.TextHttpResponseHandler;
+
+import org.apache.http.Header;
+import org.apache.http.HttpStatus;
+import org.json.JSONArray;
+import org.json.JSONException;
+import org.json.JSONObject;
+import org.json.JSONTokener;
+
+/**
+ * Used to intercept and handle the responses from requests made using {@link com.loopj.android.http.AsyncHttpClient}, with
+ * automatic parsing into a {@link JSONObject} or {@link JSONArray}. <p>&nbsp;</p> This class is
+ * designed to be passed to get, post, put and delete requests with the {@link #onSuccess(int,
+ * org.apache.http.Header[], org.json.JSONArray)} or {@link #onSuccess(int,
+ * org.apache.http.Header[], org.json.JSONObject)} methods anonymously overridden. <p>&nbsp;</p>
+ * Additionally, you can override the other event methods from the parent class.
+ */
+public class JsonHttpResponseHandler extends TextHttpResponseHandler {
+
+    private static final String LOG_TAG = "JsonHttpResponseHandler";
+
+    /**
+     * Creates new JsonHttpResponseHandler, with JSON String encoding UTF-8
+     */
+    public JsonHttpResponseHandler() {
+        super(DEFAULT_CHARSET);
+    }
+
+    /**
+     * Creates new JsonHttpRespnseHandler with given JSON String encoding
+     *
+     * @param encoding String encoding to be used when parsing JSON
+     */
+    public JsonHttpResponseHandler(String encoding) {
+        super(encoding);
+    }
+
+    /**
+     * Returns when request succeeds
+     *
+     * @param statusCode http response status line
+     * @param headers    response headers if any
+     * @param response   parsed response if any
+     */
+    public void onSuccess(int statusCode, Header[] headers, JSONObject response) {
+        Log.w(LOG_TAG, "onSuccess(int, Header[], JSONObject) was not overriden, but callback was received");
+    }
+
+    /**
+     * Returns when request succeeds
+     *
+     * @param statusCode http response status line
+     * @param headers    response headers if any
+     * @param response   parsed response if any
+     */
+    public void onSuccess(int statusCode, Header[] headers, JSONArray response) {
+        Log.w(LOG_TAG, "onSuccess(int, Header[], JSONArray) was not overriden, but callback was received");
+    }
+
+    /**
+     * Returns when request failed
+     *
+     * @param statusCode    http response status line
+     * @param headers       response headers if any
+     * @param throwable     throwable describing the way request failed
+     * @param errorResponse parsed response if any
+     */
+    public void onFailure(int statusCode, Header[] headers, Throwable throwable, JSONObject errorResponse) {
+        Log.w(LOG_TAG, "onFailure(int, Header[], Throwable, JSONObject) was not overriden, but callback was received", throwable);
+    }
+
+    /**
+     * Returns when request failed
+     *
+     * @param statusCode    http response status line
+     * @param headers       response headers if any
+     * @param throwable     throwable describing the way request failed
+     * @param errorResponse parsed response if any
+     */
+    public void onFailure(int statusCode, Header[] headers, Throwable throwable, JSONArray errorResponse) {
+        Log.w(LOG_TAG, "onFailure(int, Header[], Throwable, JSONArray) was not overriden, but callback was received", throwable);
+    }
+
+    @Override
+    public void onFailure(int statusCode, Header[] headers, String responseString, Throwable throwable) {
+        Log.w(LOG_TAG, "onFailure(int, Header[], String, Throwable) was not overriden, but callback was received", throwable);
+    }
+
+    @Override
+    public void onSuccess(int statusCode, Header[] headers, String responseString) {
+        Log.w(LOG_TAG, "onSuccess(int, Header[], String) was not overriden, but callback was received");
+    }
+
+    @Override
+    public final void onSuccess(final int statusCode, final Header[] headers, final byte[] responseBytes) {
+        if (statusCode != HttpStatus.SC_NO_CONTENT) {
+            Runnable parser = new Runnable() {
+                @Override
+                public void run() {
+                    try {
+                        final Object jsonResponse = parseResponse(responseBytes);
+                        postRunnable(new Runnable() {
+                            @Override
+                            public void run() {
+                                if (jsonResponse instanceof JSONObject) {
+                                    onSuccess(statusCode, headers, (JSONObject) jsonResponse);
+                                } else if (jsonResponse instanceof JSONArray) {
+                                    onSuccess(statusCode, headers, (JSONArray) jsonResponse);
+                                } else if (jsonResponse instanceof String) {
+                                    onFailure(statusCode, headers, (String) jsonResponse, new JSONException("Response cannot be parsed as JSON data"));
+                                } else {
+                                    onFailure(statusCode, headers, new JSONException("Unexpected response type " + jsonResponse.getClass().getName()), (JSONObject) null);
+                                }
+
+                            }
+                        });
+                    } catch (final JSONException ex) {
+                        postRunnable(new Runnable() {
+                            @Override
+                            public void run() {
+                                onFailure(statusCode, headers, ex, (JSONObject) null);
+                            }
+                        });
+                    }
+                }
+            };
+            if (!getUseSynchronousMode()) {
+                new Thread(parser).start();
+            } else {
+                // In synchronous mode everything should be run on one thread
+                parser.run();
+            }
+        } else {
+            onSuccess(statusCode, headers, new JSONObject());
+        }
+    }
+
+    @Override
+    public final void onFailure(final int statusCode, final Header[] headers, final byte[] responseBytes, final Throwable throwable) {
+        if (responseBytes != null) {
+            Runnable parser = new Runnable() {
+                @Override
+                public void run() {
+                    try {
+                        final Object jsonResponse = parseResponse(responseBytes);
+                        postRunnable(new Runnable() {
+                            @Override
+                            public void run() {
+                                if (jsonResponse instanceof JSONObject) {
+                                    onFailure(statusCode, headers, throwable, (JSONObject) jsonResponse);
+                                } else if (jsonResponse instanceof JSONArray) {
+                                    onFailure(statusCode, headers, throwable, (JSONArray) jsonResponse);
+                                } else if (jsonResponse instanceof String) {
+                                    onFailure(statusCode, headers, (String) jsonResponse, throwable);
+                                } else {
+                                    onFailure(statusCode, headers, new JSONException("Unexpected response type " + jsonResponse.getClass().getName()), (JSONObject) null);
+                                }
+                            }
+                        });
+
+                    } catch (final JSONException ex) {
+                        postRunnable(new Runnable() {
+                            @Override
+                            public void run() {
+                                onFailure(statusCode, headers, ex, (JSONObject) null);
+                            }
+                        });
+
+                    }
+                }
+            };
+            if (!getUseSynchronousMode()) {
+                new Thread(parser).start();
+            } else {
+                // In synchronous mode everything should be run on one thread
+                parser.run();
+            }
+        } else {
+            Log.v(LOG_TAG, "response body is null, calling onFailure(Throwable, JSONObject)");
+            onFailure(statusCode, headers, throwable, (JSONObject) null);
+        }
+
+        // In all cases, call the default failure listener
+        onAllFailure(statusCode, headers, responseBytes, throwable);
+    }
+
+    public void onAllFailure(int statusCode, Header[] headers, byte[] responseBytes, Throwable throwable) {
+        // All failures go there
+    }
+
+    /**
+     * Returns Object of type {@link JSONObject}, {@link JSONArray}, String, Boolean, Integer, Long,
+     * Double or {@link JSONObject#NULL}, see {@link org.json.JSONTokener#nextValue()}
+     *
+     * @param responseBody response bytes to be assembled in String and parsed as JSON
+     * @return Object parsedResponse
+     * @throws org.json.JSONException exception if thrown while parsing JSON
+     */
+    protected Object parseResponse(byte[] responseBody) throws JSONException {
+        if (null == responseBody)
+            return null;
+        Object result = null;
+        //trim the string to prevent start with blank, and test if the string is valid JSON, because the parser don't do this :(. If JSON is not valid this will return null
+        String jsonString = getResponseString(responseBody, getCharset());
+        if (jsonString != null) {
+            jsonString = jsonString.trim();
+            if (jsonString.startsWith(UTF8_BOM)) {
+                jsonString = jsonString.substring(1);
+            }
+            if (jsonString.startsWith("{") || jsonString.startsWith("[")) {
+                result = new JSONTokener(jsonString).nextValue();
+            }
+        }
+        if (result == null) {
+            result = jsonString;
+        }
+        return result;
+    }
+}

docs-android/app/src/main/java/com/sismics/docs/model/application/ApplicationContext.java

@@ -3,8 +3,8 @@ package com.sismics.docs.model.application;
 import android.app.Activity;
 import android.content.Context;
 
-import com.loopj.android.http.JsonHttpResponseHandler;
 import com.sismics.docs.listener.CallbackListener;
+import com.sismics.docs.listener.JsonHttpResponseHandler;
 import com.sismics.docs.resource.UserResource;
 import com.sismics.docs.util.PreferenceUtil;
 

docs-android/app/src/main/java/com/sismics/docs/resource/DocumentResource.java

@@ -2,8 +2,8 @@ package com.sismics.docs.resource;
 
 import android.content.Context;
 
-import com.loopj.android.http.JsonHttpResponseHandler;
 import com.loopj.android.http.RequestParams;
+import com.sismics.docs.listener.JsonHttpResponseHandler;
 
 /**
  * Access to /document API.

docs-android/app/src/main/java/com/sismics/docs/resource/FileResource.java

@@ -2,7 +2,8 @@ package com.sismics.docs.resource;
 
 import android.content.Context;
 
-import com.loopj.android.http.JsonHttpResponseHandler;
+import com.sismics.docs.listener.JsonHttpResponseHandler;
+
 
 /**
  * Access to /file API.

docs-android/app/src/main/java/com/sismics/docs/resource/TagResource.java

@@ -2,7 +2,8 @@ package com.sismics.docs.resource;
 
 import android.content.Context;
 
-import com.loopj.android.http.JsonHttpResponseHandler;
+import com.sismics.docs.listener.JsonHttpResponseHandler;
+
 
 /**
  * Access to /tag API.

docs-android/app/src/main/java/com/sismics/docs/resource/UserResource.java

@@ -2,8 +2,8 @@ package com.sismics.docs.resource;
 
 import android.content.Context;
 
-import com.loopj.android.http.JsonHttpResponseHandler;
 import com.loopj.android.http.RequestParams;
+import com.sismics.docs.listener.JsonHttpResponseHandler;
 
 /**
  * Access to /user API.

docs-android/app/src/main/java/com/sismics/docs/ui/view/EmptyRecyclerView.java

@@ -0,0 +1,57 @@
+package com.sismics.docs.ui.view;
+
+import android.content.Context;
+import android.support.v7.widget.RecyclerView;
+import android.util.AttributeSet;
+import android.view.View;
+
+/**
+ * RecyclerView with empty view support.
+ * Thanks to https://gist.github.com/adelnizamutdinov/31c8f054d1af4588dc5c
+ *
+ * @author Nizamutdinov Adel
+ */
+public class EmptyRecyclerView extends RecyclerView {
+    private View emptyView;
+
+    public EmptyRecyclerView(Context context) { super(context); }
+
+    public EmptyRecyclerView(Context context, AttributeSet attrs) { super(context, attrs); }
+
+    public EmptyRecyclerView(Context context, AttributeSet attrs, int defStyle) {
+        super(context, attrs, defStyle);
+    }
+
+    void checkIfEmpty() {
+        if (emptyView != null) {
+            emptyView.setVisibility(getAdapter().getItemCount() > 0 ? GONE : VISIBLE);
+        }
+    }
+
+    final AdapterDataObserver observer = new AdapterDataObserver() {
+        @Override public void onChanged() {
+            super.onChanged();
+            checkIfEmpty();
+        }
+    };
+
+    @Override public void setAdapter(Adapter adapter) {
+        final Adapter oldAdapter = getAdapter();
+        if (oldAdapter != null) {
+            oldAdapter.unregisterAdapterDataObserver(observer);
+        }
+        super.setAdapter(adapter);
+        if (adapter != null) {
+            adapter.registerAdapterDataObserver(observer);
+        }
+    }
+
+    public void setEmptyView(View emptyView) {
+        // Hide the current empty view
+        if (this.emptyView != null) {
+            this.emptyView.setVisibility(GONE);
+        }
+        this.emptyView = emptyView;
+        checkIfEmpty();
+    }
+}

docs-android/app/src/main/res/layout/doc_list_fragment.xml

@@ -4,20 +4,30 @@
     android:layout_width="match_parent"
     android:layout_height="match_parent">
 
-    <android.support.v7.widget.RecyclerView
+    <com.sismics.docs.ui.view.EmptyRecyclerView
         android:id="@+id/docList"
         android:layout_width="match_parent"
         android:layout_height="match_parent"
         android:scrollbars="vertical">
-
+    </com.sismics.docs.ui.view.EmptyRecyclerView>
-    </android.support.v7.widget.RecyclerView>
 
     <ProgressBar
         android:id="@+id/progressBar"
         style="?android:attr/progressBarStyleLarge"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
+        android:visibility="gone"
         android:layout_centerInParent="true"
         android:indeterminate="true" />
 
+    <TextView
+        android:id="@+id/documentsEmptyView"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:visibility="gone"
+        android:text="@string/no_documents"
+        android:fontFamily="sans-serif-light"
+        android:textSize="16sp"
+        android:layout_centerInParent="true"/>
+
 </RelativeLayout>

docs-android/app/src/main/res/layout/document_activity.xml

@@ -94,6 +94,16 @@
             android:layout_centerInParent="true"
             android:indeterminate="true"/>
 
+        <TextView
+            android:id="@+id/filesEmptyView"
+            android:layout_width="wrap_content"
+            android:layout_height="wrap_content"
+            android:visibility="gone"
+            android:text="@string/no_files"
+            android:fontFamily="sans-serif-light"
+            android:textSize="16sp"
+            android:layout_centerInParent="true"/>
+
     </RelativeLayout>
 
 </LinearLayout>

docs-android/app/src/main/res/values/strings.xml

@@ -1,6 +1,14 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
 
+    <!-- Validation -->
+    <string name="validate_error_email">Invalid email</string>
+    <string name="validate_error_length_min">Too short (min. %d)</string>
+    <string name="validate_error_length_max">Too long (max. %d)</string>
+    <string name="validate_error_required">Required</string>
+    <string name="validate_error_alphanumeric">Only letters and numbers</string>
+
+    <!-- App -->
     <string name="app_name">Sismics Docs</string>
     <string name="drawer_open">Open navigation drawer</string>
     <string name="drawer_close">Close navigation drawer</string>
@@ -28,12 +36,10 @@
     <string name="shared_documents">Shared documents</string>
     <string name="all_tags">All tags</string>
     <string name="no_tags">No tags</string>
-
+    <string name="error_loading_tags">Error loading tags</string>
-    <!-- Validation -->
+    <string name="no_documents">No documents</string>
-    <string name="validate_error_email">Invalid email</string>
+    <string name="error_loading_documents">Error loading documents</string>
-    <string name="validate_error_length_min">Too short (min. %d)</string>
+    <string name="no_files">No files</string>
-    <string name="validate_error_length_max">Too long (max. %d)</string>
+    <string name="error_loading_files">Error loading files</string>
-    <string name="validate_error_required">Required</string>
-    <string name="validate_error_alphanumeric">Only letters and numbers</string>
 
 </resources>