Created ScrollListView

app/src/main/java/org/communiquons/android/comunic/client/ui/listeners/OnScrollChangeDetectListener.java

@@ -0,0 +1,19 @@
+package org.communiquons.android.comunic.client.ui.listeners;
+
+/**
+ * On Scroll change listener
+ *
+ * This listener works with {@link org.communiquons.android.comunic.client.ui.views.ScrollListView}
+ *
+ * @author Pierre HUBERT
+ * Created by pierre on 4/28/18.
+ */
+
+public interface OnScrollChangeDetectListener {
+
+    /**
+     * This method is triggered when the user reach the top (first item) of the list view
+     */
+    void onReachTop();
+
+}

app/src/main/java/org/communiquons/android/comunic/client/ui/views/ScrollListView.java

@@ -0,0 +1,102 @@
+package org.communiquons.android.comunic.client.ui.views;
+
+import android.content.Context;
+import android.util.AttributeSet;
+import android.util.Log;
+import android.widget.AbsListView;
+
+import org.communiquons.android.comunic.client.ui.listeners.OnScrollChangeDetectListener;
+
+/**
+ * Custom ListView with extended functions
+ *
+ * This class use some concepts from maXp StackOverFlow answer
+ * on question "Detect Scroll Up & Scroll down in ListView"
+ *
+ * @author Pierre HUBERT
+ * Created by pierre on 4/28/18.
+ */
+
+public class ScrollListView extends android.widget.ListView {
+
+    /**
+     * Debug tag
+     */
+    private static final String TAG = "ScrollListView";
+
+    /**
+     * Optional additional scroll listener
+     */
+    private OnScrollListener onScrollListener;
+
+    /**
+     * Scroll change detection listener
+     */
+    private OnScrollChangeDetectListener onScrollChangeDetectListener;
+
+    public ScrollListView(Context context) {
+        super(context);
+        init();
+    }
+
+    public ScrollListView(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        init();
+    }
+
+    public ScrollListView(Context context, AttributeSet attrs, int defStyleAttr) {
+        super(context, attrs, defStyleAttr);
+        init();
+    }
+
+    public ScrollListView(Context context, AttributeSet attrs, int defStyleAttr, int defStyleRes) {
+        super(context, attrs, defStyleAttr, defStyleRes);
+        init();
+    }
+
+    /**
+     * Initialize this view
+     */
+    private void init(){
+
+        super.setOnScrollListener(new OnScrollListener() {
+            @Override
+            public void onScrollStateChanged(AbsListView view, int scrollState) {
+
+                //Call additional listener (if any)
+                if(onScrollListener != null)
+                    onScrollListener.onScrollStateChanged(view, scrollState);
+
+            }
+
+            @Override
+            public void onScroll(AbsListView view, int firstVisibleItem,
+                                 int visibleItemCount, int totalItemCount) {
+
+                //Call additional listener (if any)
+                if(onScrollListener != null)
+                    onScrollListener.onScroll(view, firstVisibleItem,
+                            visibleItemCount, totalItemCount);
+
+
+                if(onScrollChangeDetectListener != null && firstVisibleItem == 0
+                        && visibleItemCount > 0)
+                    onScrollChangeDetectListener.onReachTop();
+            }
+        });
+
+    }
+
+    @Override
+    public void setOnScrollListener(OnScrollListener onScrollListener) {
+        this.onScrollListener = onScrollListener;
+    }
+
+    public void setOnScrollChangeDetectListener(OnScrollChangeDetectListener onScrollChangeDetectListener) {
+        this.onScrollChangeDetectListener = onScrollChangeDetectListener;
+    }
+
+    public OnScrollListener getOnScrollListener() {
+        return onScrollListener;
+    }
+}

app/src/main/res/layout/fragment_conversation.xml

@@ -21,7 +21,7 @@
         android:layout_marginTop="10dp"/>
 
     <!-- Messages -->
-    <ListView
+    <org.communiquons.android.comunic.client.ui.views.ScrollListView
         android:id="@+id/fragment_conversation_messageslist"
         android:layout_width="match_parent"
         android:layout_height="0dp"