hide toolbar and fab on doc list scroll

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

@@ -9,11 +9,13 @@ import android.provider.SearchRecentSuggestions;
 import android.support.v4.widget.DrawerLayout;
 import android.support.v7.app.ActionBarDrawerToggle;
 import android.support.v7.app.AppCompatActivity;
+import android.support.v7.widget.Toolbar;
 import android.view.Menu;
 import android.view.MenuInflater;
 import android.view.MenuItem;
 import android.view.View;
 import android.widget.AdapterView;
+import android.widget.ImageButton;
 import android.widget.ListView;
 import android.widget.SearchView;
 import android.widget.TextView;
@@ -61,7 +63,10 @@ public class MainActivity extends AppCompatActivity {
         setContentView(R.layout.main_activity);
 
         // Enable ActionBar app icon to behave as action to toggle nav drawer
-        drawerLayout = (DrawerLayout) findViewById(R.id.drawer_layout);
+        drawerLayout = findViewById(R.id.drawer_layout);
+        Toolbar toolbar = findViewById(R.id.toolbar);
+        toolbar.setTitleTextColor(getResources().getColor(android.R.color.white));
+        setSupportActionBar(toolbar);
         if (getSupportActionBar() != null) {
             getSupportActionBar().setDisplayHomeAsUpEnabled(true);
             getSupportActionBar().setHomeButtonEnabled(true);
@@ -75,15 +80,15 @@ public class MainActivity extends AppCompatActivity {
 
         // Fill the drawer user info
         JSONObject userInfo = ApplicationContext.getInstance().getUserInfo();
-        TextView usernameTextView = (TextView) findViewById(R.id.usernameTextView);
+        TextView usernameTextView = findViewById(R.id.usernameTextView);
         usernameTextView.setText(userInfo.optString("username"));
-        TextView emailTextView = (TextView) findViewById(R.id.emailTextView);
+        TextView emailTextView = findViewById(R.id.emailTextView);
         emailTextView.setText(userInfo.optString("email"));
 
         // Get tag list to fill the drawer
-        final ListView tagListView = (ListView) findViewById(R.id.tagListView);
+        final ListView tagListView = findViewById(R.id.tagListView);
         final View tagProgressView = findViewById(R.id.tagProgressView);
-        final TextView tagEmptyView = (TextView) findViewById(R.id.tagEmptyView);
+        final TextView tagEmptyView = findViewById(R.id.tagEmptyView);
         tagListView.setEmptyView(tagProgressView);
         JSONObject cacheTags = PreferenceUtil.getCachedJson(this, PreferenceUtil.PREF_CACHED_TAGS_JSON);
         if (cacheTags != null) {
@@ -145,6 +150,15 @@ public class MainActivity extends AppCompatActivity {
             }
         });
 
+        // Add document button
+        ImageButton addDocumentButton = findViewById(R.id.addDocumentButton);
+        addDocumentButton.setOnClickListener(new View.OnClickListener() {
+            @Override
+            public void onClick(View v) {
+                startActivity(new Intent(MainActivity.this, DocumentEditActivity.class));
+            }
+        });
+
         handleIntent(getIntent());
 
         EventBus.getDefault().register(this);

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

@@ -2,6 +2,7 @@ package com.sismics.docs.fragment;
 
 import android.content.Intent;
 import android.os.Bundle;
+import android.support.annotation.NonNull;
 import android.support.v4.app.Fragment;
 import android.support.v4.widget.SwipeRefreshLayout;
 import android.support.v7.widget.LinearLayoutManager;
@@ -9,12 +10,10 @@ import android.support.v7.widget.RecyclerView;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
-import android.widget.ImageButton;
 import android.widget.TextView;
 import android.widget.Toast;
 
 import com.sismics.docs.R;
-import com.sismics.docs.activity.DocumentEditActivity;
 import com.sismics.docs.activity.DocumentViewActivity;
 import com.sismics.docs.adapter.DocListAdapter;
 import com.sismics.docs.event.DocumentAddEvent;
@@ -46,11 +45,6 @@ public class DocListFragment extends Fragment {
      */
     private String query;
 
-    /**
-     * Request code of adding document.
-     */
-    private static final int REQUEST_CODE_ADD_DOCUMENT = 1;
-
     // View cache
     private EmptyRecyclerView recyclerView;
     private SwipeRefreshLayout swipeRefreshLayout;
@@ -60,11 +54,11 @@ public class DocListFragment extends Fragment {
     private int previousTotal = 0;
 
     @Override
-    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
+    public View onCreateView(@NonNull LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
         final View view = inflater.inflate(R.layout.doc_list_fragment, container, false);
 
         // Configure the RecyclerView
-        recyclerView = (EmptyRecyclerView) view.findViewById(R.id.docList);
+        recyclerView = view.findViewById(R.id.docList);
         adapter = new DocListAdapter();
         recyclerView.setAdapter(adapter);
         recyclerView.setHasFixedSize(true);
@@ -122,16 +116,6 @@ public class DocListFragment extends Fragment {
             }
         });
 
-        // Add document button
-        ImageButton addDocumentButton = (ImageButton) view.findViewById(R.id.addDocumentButton);
-        addDocumentButton.setOnClickListener(new View.OnClickListener() {
-            @Override
-            public void onClick(View v) {
-                Intent intent = new Intent(getActivity(), DocumentEditActivity.class);
-                startActivityForResult(intent, REQUEST_CODE_ADD_DOCUMENT);
-            }
-        });
-
         // Grab the documents
         loadDocuments(view, true);
 

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

@@ -0,0 +1,47 @@
+package com.sismics.docs.ui;
+
+import android.content.Context;
+import android.content.res.TypedArray;
+import android.support.annotation.NonNull;
+import android.support.design.widget.AppBarLayout;
+import android.support.design.widget.CoordinatorLayout;
+import android.support.design.widget.FloatingActionButton;
+import android.util.AttributeSet;
+import android.view.View;
+
+import com.sismics.docs.R;
+
+public class ScrollingFABBehavior extends CoordinatorLayout.Behavior<FloatingActionButton> {
+    private int toolbarHeight;
+
+    public ScrollingFABBehavior(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        this.toolbarHeight = getToolbarHeight(context);
+    }
+
+    @Override
+    public boolean layoutDependsOn(@NonNull CoordinatorLayout parent, @NonNull FloatingActionButton fab, @NonNull View dependency) {
+        return dependency instanceof AppBarLayout;
+    }
+
+    @Override
+    public boolean onDependentViewChanged(@NonNull CoordinatorLayout parent, @NonNull FloatingActionButton fab, @NonNull View dependency) {
+        if (dependency instanceof AppBarLayout) {
+                CoordinatorLayout.LayoutParams lp = (CoordinatorLayout.LayoutParams) fab.getLayoutParams();
+                int fabBottomMargin = lp.bottomMargin;
+                int distanceToScroll = fab.getHeight() + fabBottomMargin;
+                float ratio = dependency.getY() /(float) toolbarHeight;
+                fab.setTranslationY(- distanceToScroll * ratio);
+        }
+        return true;
+    }
+
+    private int getToolbarHeight(Context context) {
+        final TypedArray styledAttributes = context.getTheme().obtainStyledAttributes(
+                new int[] { R.attr.actionBarSize });
+        int toolbarHeight = (int) styledAttributes.getDimension(0, 0);
+        styledAttributes.recycle();
+
+        return toolbarHeight;
+    }
+}