BindableLayoutBuilder add hasStableIds(),viewItemId()

library/src/main/java/io/nlopez/smartadapters/SmartAdapter.java

@@ -1,6 +1,7 @@
 package io.nlopez.smartadapters;
 
 import android.support.annotation.NonNull;
+import android.support.annotation.Nullable;
 import android.support.annotation.VisibleForTesting;
 import android.support.v7.widget.RecyclerView;
 import android.widget.AbsListView;
@@ -24,6 +25,10 @@ private SmartAdapter() {
 
     }
 
+    public interface ConstructorRecyclerAdapter {
+        RecyclerMultiAdapter constructor(Mapper mapper, List listItems, BindableLayoutBuilder builder);
+    }
+
     /**
      * Include the object list that is going to be represented in our collection view.
      *
@@ -129,6 +134,18 @@ public RecyclerMultiAdapter recyclerAdapter() {
             return response;
         }
 
+        /**
+         *  Returns the instantiated adapter for RecyclerView
+         *
+         * @param constructorRecyclerAdapter
+         * @return adapter based on {@code RecyclerView.Adapter}
+         */
+        public RecyclerMultiAdapter recyclerAdapter(@NonNull ConstructorRecyclerAdapter constructorRecyclerAdapter) {
+            RecyclerMultiAdapter response = constructorRecyclerAdapter.constructor(mapper, elements, builder);
+            response.setViewEventListener(listener);
+            return response;
+        }
+
         /**
          * Assigns the created adapter to the given {@code AbsListView} inherited widget (ListView, GridView).
          *
@@ -149,8 +166,19 @@ public MultiAdapter into(@NonNull AbsListView widget) {
          * @return assigned adapter
          */
         public RecyclerMultiAdapter into(@NonNull RecyclerView recyclerView) {
+           return into(recyclerView,null);
+        }
+
+        /**
+         * Assigns the created adapter to the given {@code RecyclerView}.
+         *
+         * @param recyclerView instance of RecyclerView
+         * @param constructorRecyclerAdapter
+         * @return assigned adapter
+         */
+        public RecyclerMultiAdapter into(@NonNull RecyclerView recyclerView,@Nullable ConstructorRecyclerAdapter constructorRecyclerAdapter) {
             validateMapper();
-            RecyclerMultiAdapter adapter = recyclerAdapter();
+            RecyclerMultiAdapter adapter = constructorRecyclerAdapter == null ? recyclerAdapter() : recyclerAdapter(constructorRecyclerAdapter);
             recyclerView.setAdapter(adapter);
             return adapter;
         }

library/src/main/java/io/nlopez/smartadapters/adapters/MultiAdapter.java

@@ -3,16 +3,15 @@
 import android.view.View;
 import android.view.ViewGroup;
 import android.widget.BaseAdapter;
-
-import java.util.List;
-
 import io.nlopez.smartadapters.builders.BindableLayoutBuilder;
 import io.nlopez.smartadapters.builders.DefaultBindableLayoutBuilder;
 import io.nlopez.smartadapters.utils.Mapper;
 import io.nlopez.smartadapters.utils.ThreadHelper;
 import io.nlopez.smartadapters.utils.ViewEventListener;
 import io.nlopez.smartadapters.views.BindableLayout;
 
+import java.util.List;
+
 /**
  * Adapter for {@code AbsListView} based widgets
  */
@@ -131,7 +130,16 @@ public Object getItem(int position) {
 
     @Override
     public long getItemId(int position) {
-        return position;
+        Object object = listItems.get(position);
+        return builder.viewItemId(object, position, mapper);
+    }
+
+    @Override
+    public boolean hasStableIds() {
+        if(builder.hasStableIds())
+            return builder.hasStableIds();
+        else
+            return super.hasStableIds();
     }
 
     @Override

library/src/main/java/io/nlopez/smartadapters/adapters/RecyclerMultiAdapter.java

@@ -3,10 +3,6 @@
 import android.support.v7.widget.RecyclerView;
 import android.view.View;
 import android.view.ViewGroup;
-
-import java.util.ArrayList;
-import java.util.List;
-
 import io.nlopez.smartadapters.builders.BindableLayoutBuilder;
 import io.nlopez.smartadapters.builders.DefaultBindableLayoutBuilder;
 import io.nlopez.smartadapters.utils.Mapper;
@@ -15,6 +11,9 @@
 import io.nlopez.smartadapters.views.BindableLayout;
 import io.nlopez.smartadapters.views.BindableViewHolder;
 
+import java.util.ArrayList;
+import java.util.List;
+
 /**
  * Adapter for {@code RecyclerView} based widgets
  */
@@ -40,6 +39,7 @@ public RecyclerMultiAdapter(Mapper mapper, List listItems, BindableLayoutBuilder
             this.builder = builder;
         }
         this.itemClassArray = new ArrayList<>(mapper.objectClasses());
+        this.setHasStableIds(this.builder.hasStableIds());
     }
 
     @Override
@@ -136,7 +136,8 @@ public int getItemViewType(int position) {
 
     @Override
     public long getItemId(int position) {
-        return position;
+        Object object = listItems.get(position);
+        return builder.viewItemId(object, position, mapper);
     }
 
     @Override

library/src/main/java/io/nlopez/smartadapters/builders/BindableLayoutBuilder.java

@@ -13,4 +13,8 @@ public interface BindableLayoutBuilder<T> {
     Class<? extends BindableLayout> viewType(@NonNull T item, int position, @NonNull Mapper mapper);
 
     boolean allowsMultimapping();
+
+    boolean hasStableIds();
+
+    long viewItemId(@NonNull T item, int position, @NonNull Mapper mapper);
 }

library/src/main/java/io/nlopez/smartadapters/builders/DefaultBindableLayoutBuilder.java

@@ -4,14 +4,13 @@
 import android.support.annotation.NonNull;
 import android.view.View;
 import android.view.ViewGroup;
-
-import java.lang.reflect.Constructor;
-import java.util.List;
-
 import io.nlopez.smartadapters.utils.Mapper;
 import io.nlopez.smartadapters.utils.Reflections;
 import io.nlopez.smartadapters.views.BindableLayout;
 
+import java.lang.reflect.Constructor;
+import java.util.List;
+
 /**
  * Basic layout builder for most of the cases. It handles the reflection caching so the impact
  * done by it is very little.
@@ -51,4 +50,14 @@ public Class<? extends BindableLayout> viewType(@NonNull Object item, int positi
     @Override public boolean allowsMultimapping() {
         return false;
     }
+
+    @Override
+    public boolean hasStableIds() {
+        return false;
+    }
+
+    @Override
+    public long viewItemId(@NonNull Object item, int position, @NonNull Mapper mapper) {
+        return position;
+    }
 }

library/src/test/java/io/nlopez/smartadapters/builders/DefaultBindableLayoutBuilderTest.java

@@ -1,5 +1,6 @@
 package io.nlopez.smartadapters.builders;
 
+import android.support.annotation.NonNull;
 import android.view.View;
 import android.view.ViewGroup;
 
@@ -15,6 +16,7 @@
 import io.nlopez.smartadapters.mocks.MockModel2;
 import io.nlopez.smartadapters.utils.Mapper;
 
+import static junit.framework.Assert.assertEquals;
 import static junit.framework.Assert.assertNotNull;
 import static junit.framework.Assert.assertTrue;
 import static org.mockito.Mockito.when;
@@ -58,4 +60,25 @@ public void test_crash_if_unknown_view_class() {
         int viewType = Mapper.viewTypeFromViewClass(builder.viewType(new Object(), 0, mapper));
         View bindableLayout = builder.build(parent, viewType, null, mapper);
     }
+
+    @Test
+    public void test_build_view_item_id() {
+        DefaultBindableLayoutBuilder builder = new DefaultBindableLayoutBuilder(){
+            @Override
+            public boolean hasStableIds() {
+                return true;
+            }
+
+            @Override
+            public long viewItemId(@NonNull Object item, int position, @NonNull Mapper mapper) {
+                return 100 + position;
+            }
+        };
+
+        long itemId = builder.viewItemId(mockModel, 0, mapper);
+
+        assertEquals(itemId,100);
+        assertTrue(builder.hasStableIds());
+    }
+
 }

sample/build.gradle

@@ -20,6 +20,8 @@ dependencies {
     compile 'com.android.support:appcompat-v7:23.1.0'
     compile 'com.jakewharton:butterknife:6.1.0'
     compile 'com.squareup.picasso:picasso:2.5.2'
+    //https://github.com/timehop/sticky-headers-recyclerview
+    compile 'com.timehop.stickyheadersrecyclerview:library:0.4.3@aar'
     compile project(':library')
     debugCompile 'com.squareup.leakcanary:leakcanary-android:1.3'
     releaseCompile 'com.squareup.leakcanary:leakcanary-android-no-op:1.3'

sample/src/main/AndroidManifest.xml

@@ -30,5 +30,6 @@
         <activity android:name=".SingleRecyclerViewActivity" />
         <activity android:name=".MultiRecyclerViewActivity" />
         <activity android:name=".MultiRecyclerViewCustomBuilderActivity" />
+        <activity android:name=".StickyHeadersRecyclerViewActivity" />
     </application>
 </manifest>

sample/src/main/java/io/nlopez/smartadapters/sample/MainActivity.java

@@ -42,4 +42,9 @@ void launchMultiRecyclerViewCustomBuilder() {
         startActivity(new Intent(this, MultiRecyclerViewCustomBuilderActivity.class));
     }
 
+    @OnClick(R.id.sticky_headers_recyclerview_custom_builder_button)
+    void launchStickyHeadersRecyclerViewCustomBuilder() {
+        startActivity(new Intent(this, StickyHeadersRecyclerViewActivity.class));
+    }
+
 }

sample/src/main/java/io/nlopez/smartadapters/sample/SingleRecyclerViewActivity.java

@@ -10,6 +10,7 @@
 import butterknife.ButterKnife;
 import butterknife.InjectView;
 import io.nlopez.smartadapters.SmartAdapter;
+import io.nlopez.smartadapters.adapters.RecyclerMultiAdapter;
 import io.nlopez.smartadapters.sample.model.User;
 import io.nlopez.smartadapters.sample.util.DataGenerator;
 import io.nlopez.smartadapters.sample.view.UserView;
@@ -31,7 +32,8 @@ public void onCreate(Bundle bundle) {
     private void initView() {
         List<User> userList = DataGenerator.generateUsers(100);
         recyclerView.setLayoutManager(new LinearLayoutManager(this));
-        SmartAdapter.items(userList).map(User.class, UserView.class).into(recyclerView);
+        RecyclerMultiAdapter adapter = SmartAdapter.items(userList).map(User.class, UserView.class).into(recyclerView);
+
     }
 
 }

sample/src/main/java/io/nlopez/smartadapters/sample/StickyHeadersRecyclerViewActivity.java

@@ -0,0 +1,130 @@
+package io.nlopez.smartadapters.sample;
+
+import android.app.Activity;
+import android.graphics.Color;
+import android.os.Bundle;
+import android.support.v7.widget.LinearLayoutManager;
+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.timehop.stickyheadersrecyclerview.StickyRecyclerHeadersAdapter;
+import com.timehop.stickyheadersrecyclerview.StickyRecyclerHeadersDecoration;
+import com.timehop.stickyheadersrecyclerview.StickyRecyclerHeadersTouchListener;
+
+import java.security.SecureRandom;
+import java.util.List;
+
+import butterknife.ButterKnife;
+import butterknife.InjectView;
+import io.nlopez.smartadapters.SmartAdapter;
+import io.nlopez.smartadapters.adapters.RecyclerMultiAdapter;
+import io.nlopez.smartadapters.builders.BindableLayoutBuilder;
+import io.nlopez.smartadapters.sample.model.User;
+import io.nlopez.smartadapters.sample.util.DataGenerator;
+import io.nlopez.smartadapters.sample.view.UserView;
+import io.nlopez.smartadapters.utils.Mapper;
+
+public class StickyHeadersRecyclerViewActivity extends Activity {
+
+    @InjectView(R.id.recycler_view)
+    RecyclerView recyclerView;
+
+    @Override
+    public void onCreate(Bundle bundle) {
+        super.onCreate(bundle);
+        setContentView(R.layout.activity_recyclerview);
+
+        ButterKnife.inject(this);
+        initView();
+    }
+
+    private void initView() {
+        List<User> userList = DataGenerator.generateUsers(100);
+        recyclerView.setLayoutManager(new LinearLayoutManager(this));
+        MyRecyclerMultiAdapter adapter = (MyRecyclerMultiAdapter) SmartAdapter.items(userList).map(User.class, UserView.class)
+                .recyclerAdapter(new SmartAdapter.ConstructorRecyclerAdapter() {
+                    @Override
+                    public RecyclerMultiAdapter constructor(Mapper mapper, List listItems, BindableLayoutBuilder builder) {
+
+                        return new MyRecyclerMultiAdapter(mapper,listItems,builder);
+                    }
+                });
+
+        recyclerView.setAdapter(adapter);
+
+        // Add the sticky headers decoration
+        final StickyRecyclerHeadersDecoration headersDecor = new StickyRecyclerHeadersDecoration(adapter);
+        recyclerView.addItemDecoration(headersDecor);
+
+        // Add decoration for dividers between list items
+//        recyclerView.addItemDecoration(new DividerDecoration(this));
+
+        // Add touch listeners
+        StickyRecyclerHeadersTouchListener touchListener =
+                new StickyRecyclerHeadersTouchListener(recyclerView, headersDecor);
+        touchListener.setOnHeaderClickListener(
+                new StickyRecyclerHeadersTouchListener.OnHeaderClickListener() {
+                    @Override
+                    public void onHeaderClick(View header, int position, long headerId) {
+                        Toast.makeText(StickyHeadersRecyclerViewActivity.this, "Header position: " + position + ", id: " + headerId,
+                                Toast.LENGTH_SHORT).show();
+                    }
+                });
+        recyclerView.addOnItemTouchListener(touchListener);
+
+        adapter.registerAdapterDataObserver(new RecyclerView.AdapterDataObserver() {
+            @Override
+            public void onChanged() {
+                headersDecor.invalidateHeaders();
+            }
+        });
+
+
+    }
+
+    public class MyRecyclerMultiAdapter extends RecyclerMultiAdapter implements StickyRecyclerHeadersAdapter<RecyclerView.ViewHolder> {
+
+        public MyRecyclerMultiAdapter(Mapper mapper, List listItems, BindableLayoutBuilder builder) {
+            super(mapper, listItems, builder);
+        }
+
+        @Override
+        public long getHeaderId(int position) {
+            if (position == 0) {
+                return -1;
+            } else {
+                return 'A';
+            }
+        }
+
+        @Override
+        public RecyclerView.ViewHolder onCreateHeaderViewHolder(ViewGroup parent) {
+            View view = LayoutInflater.from(parent.getContext())
+                    .inflate(R.layout.view_header, parent, false);
+            return new RecyclerView.ViewHolder(view) {
+            };
+        }
+
+        @Override
+        public void onBindHeaderViewHolder(RecyclerView.ViewHolder holder, int position) {
+            TextView textView = (TextView) holder.itemView;
+            textView.setText(String.valueOf('A'));
+            holder.itemView.setBackgroundColor(getRandomColor());
+        }
+
+        private int getRandomColor() {
+            SecureRandom rgen = new SecureRandom();
+            return Color.HSVToColor(150, new float[]{
+                    rgen.nextInt(359), 1, 1
+            });
+        }
+
+    }
+
+
+
+}