Adds drag handle to list items

Author: iPaulPro

app/src/main/java/co/paulburke/android/itemtouchhelperdemo/RecyclerListAdapter.java

@@ -1,10 +1,13 @@
 package co.paulburke.android.itemtouchhelperdemo;
 
 import android.graphics.Color;
+import android.support.v4.view.MotionEventCompat;
 import android.support.v7.widget.RecyclerView;
 import android.view.LayoutInflater;
+import android.view.MotionEvent;
 import android.view.View;
 import android.view.ViewGroup;
+import android.widget.ImageView;
 import android.widget.TextView;
 
 import java.util.ArrayList;
@@ -24,9 +27,16 @@ public class RecyclerListAdapter extends RecyclerView.Adapter<RecyclerListAdapte
             "One", "Two", "Three", "Four", "Five", "Six", "Seven", "Eight", "Nine", "Ten"
     };
 
+    public interface OnDragStartListener {
+        void onDragStarted(RecyclerView.ViewHolder viewHolder);
+    }
+
     private final List<String> mItems = new ArrayList<>();
 
-    public RecyclerListAdapter() {
+    private final OnDragStartListener mDragStartListener;
+
+    public RecyclerListAdapter(OnDragStartListener dragStartListener) {
+        mDragStartListener = dragStartListener;
         mItems.addAll(Arrays.asList(STRINGS));
     }
 
@@ -40,6 +50,15 @@ public ItemViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
     @Override
     public void onBindViewHolder(final ItemViewHolder holder, int position) {
         holder.textView.setText(mItems.get(position));
+        holder.handleView.setOnTouchListener(new View.OnTouchListener() {
+            @Override
+            public boolean onTouch(View v, MotionEvent event) {
+                if (MotionEventCompat.getActionMasked(event) == MotionEvent.ACTION_DOWN) {
+                    mDragStartListener.onDragStarted(holder);
+                }
+                return false;
+            }
+        });
     }
 
     @Override
@@ -64,10 +83,12 @@ public static class ItemViewHolder extends RecyclerView.ViewHolder implements
             ItemTouchHelperViewHolder {
 
         public final TextView textView;
+        public final ImageView handleView;
 
         public ItemViewHolder(View itemView) {
             super(itemView);
-            textView = (TextView) itemView;
+            textView = (TextView) itemView.findViewById(R.id.text);
+            handleView = (ImageView) itemView.findViewById(R.id.handle);
         }
 
         @Override

app/src/main/java/co/paulburke/android/itemtouchhelperdemo/RecyclerListFragment.java

@@ -15,7 +15,7 @@
 /**
  * @author Paul Burke (ipaulpro)
  */
-public class RecyclerListFragment extends Fragment {
+public class RecyclerListFragment extends Fragment implements RecyclerListAdapter.OnDragStartListener {
 
     private ItemTouchHelper mItemTouchHelper;
 
@@ -32,7 +32,7 @@ public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle sa
     public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
         super.onViewCreated(view, savedInstanceState);
 
-        RecyclerListAdapter adapter = new RecyclerListAdapter();
+        RecyclerListAdapter adapter = new RecyclerListAdapter(this);
 
         RecyclerView recyclerView = (RecyclerView) view.findViewById(R.id.recycler_view);
         recyclerView.setHasFixedSize(true);
@@ -44,4 +44,8 @@ public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
         mItemTouchHelper.attachToRecyclerView(recyclerView);
     }
 
+    @Override
+    public void onDragStarted(RecyclerView.ViewHolder viewHolder) {
+        mItemTouchHelper.startDrag(viewHolder);
+    }
 }

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

@@ -1,8 +1,22 @@
 <?xml version="1.0" encoding="utf-8"?>
-<TextView xmlns:android="http://schemas.android.com/apk/res/android"
-    android:id="@+id/text"
+<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/item"
     android:layout_width="match_parent"
-    android:layout_height="?listPreferredItemHeight"
-    android:gravity="center_vertical"
-    android:paddingLeft="@dimen/activity_horizontal_margin"
-    android:textAppearance="?android:attr/textAppearanceMedium" />
+    android:layout_height="?listPreferredItemHeight">
+
+    <TextView
+        android:id="@+id/text"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center_vertical"
+        android:layout_marginLeft="@dimen/activity_horizontal_margin"
+        android:textAppearance="?android:attr/textAppearanceMedium" />
+
+    <ImageView
+        android:id="@+id/handle"
+        android:layout_width="?listPreferredItemHeight"
+        android:layout_height="match_parent"
+        android:layout_gravity="center_vertical|right"
+        android:scaleType="center"
+        android:src="@drawable/ic_reorder_grey_500_24dp" />
+</FrameLayout>