split up viewHolder

Signed-off-by: tobiasKaminsky <tobias@kaminsky.me>

src/main/java/com/owncloud/android/ui/adapter/SyncedFolderAdapter.java

@@ -23,7 +23,6 @@ package com.owncloud.android.ui.adapter;
 
 import android.content.Context;
 import android.support.annotation.NonNull;
-import android.support.annotation.Nullable;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -52,7 +51,7 @@ import butterknife.ButterKnife;
 /**
  * Adapter to display all auto-synced folders and/or instant upload media folders.
  */
-public class SyncedFolderAdapter extends SectionedRecyclerViewAdapter<SyncedFolderAdapter.MainViewHolder> {
+public class SyncedFolderAdapter extends SectionedRecyclerViewAdapter<SectionedViewHolder> {
 
     private final Context mContext;
     private final int mGridWidth;
@@ -99,7 +98,9 @@ public class SyncedFolderAdapter extends SectionedRecyclerViewAdapter<SyncedFold
 
     @Override
     public int getItemCount(int section) {
-        if (mSyncFolderItems.get(section).getFilePaths() != null) {
+        List<String> filePaths = mSyncFolderItems.get(section).getFilePaths();
+
+        if (filePaths != null) {
             return mSyncFolderItems.get(section).getFilePaths().size();
         } else {
             return 1;
@@ -129,7 +130,9 @@ public class SyncedFolderAdapter extends SectionedRecyclerViewAdapter<SyncedFold
     }
 
     @Override
-    public void onBindHeaderViewHolder(final MainViewHolder holder, final int section, boolean expanded) {
+    public void onBindHeaderViewHolder(SectionedViewHolder commonHolder, final int section, boolean expanded) {
+        HeaderViewHolder holder = (HeaderViewHolder) commonHolder;
+
         holder.mainHeaderContainer.setVisibility(View.VISIBLE);
 
         holder.title.setText(mSyncFolderItems.get(section).getFolderName());
@@ -171,14 +174,17 @@ public class SyncedFolderAdapter extends SectionedRecyclerViewAdapter<SyncedFold
     }
 
     @Override
-    public void onBindFooterViewHolder(MainViewHolder holder, int section) {
+    public void onBindFooterViewHolder(SectionedViewHolder holder, int section) {
         // not needed
     }
 
 
     @Override
-    public void onBindViewHolder(MainViewHolder holder, int section, int relativePosition, int absolutePosition) {
+    public void onBindViewHolder(SectionedViewHolder commonHolder, int section, int relativePosition,
+                                 int absolutePosition) {
         if (mSyncFolderItems.get(section).getFilePaths() != null) {
+            MainViewHolder holder = (MainViewHolder) commonHolder;
+
             File file = new File(mSyncFolderItems.get(section).getFilePaths().get(relativePosition));
 
             ThumbnailsCacheManager.MediaThumbnailGenerationTask task =
@@ -201,7 +207,7 @@ public class SyncedFolderAdapter extends SectionedRecyclerViewAdapter<SyncedFold
 
             if (mSyncFolderItems.get(section).getNumberOfFiles() > mGridTotal && relativePosition >= mGridTotal - 1) {
                 holder.counterValue.setText(String.format(Locale.US, "%d",
-                    mSyncFolderItems.get(section).getNumberOfFiles() - mGridTotal);)
+                    mSyncFolderItems.get(section).getNumberOfFiles() - mGridTotal));
                 holder.counterBar.setVisibility(View.VISIBLE);
                 holder.thumbnailDarkener.setVisibility(View.VISIBLE);
             } else {
@@ -213,11 +219,14 @@ public class SyncedFolderAdapter extends SectionedRecyclerViewAdapter<SyncedFold
 
     @NonNull
     @Override
-    public MainViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
-        View v = LayoutInflater.from(parent.getContext()).inflate(
-            viewType == VIEW_TYPE_HEADER ?
-                R.layout.synced_folders_item_header : R.layout.grid_sync_item, parent, false);
-        return new MainViewHolder(v);
+    public SectionedViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
+        if (viewType == VIEW_TYPE_HEADER) {
+            View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.synced_folders_item_header, parent, false);
+            return new HeaderViewHolder(v);
+        } else {
+            View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.grid_sync_item, parent, false);
+            return new MainViewHolder(v);
+        }
     }
 
     public interface ClickListener {
@@ -225,43 +234,41 @@ public class SyncedFolderAdapter extends SectionedRecyclerViewAdapter<SyncedFold
         void onSyncFolderSettingsClick(int section, SyncedFolderDisplayItem syncedFolderDisplayItem);
     }
 
-    static class MainViewHolder extends SectionedViewHolder {
-        @Nullable
-        @BindView(R.id.thumbnail)
-        public ImageView image;
+    static class HeaderViewHolder extends SectionedViewHolder {
+        @BindView(R.id.header_container)
+        public RelativeLayout mainHeaderContainer;
+
+        @BindView(R.id.type)
+        public ImageView type;
 
-        @Nullable
         @BindView(R.id.title)
         public TextView title;
 
-        @Nullable
-        @BindView(R.id.type)
-        public ImageView type;
+        @BindView(R.id.syncStatusButton)
+        public ImageButton syncStatusButton;
 
-        @Nullable
         @BindView(R.id.settingsButton)
         public ImageButton menuButton;
 
-        @Nullable
-        @BindView(R.id.syncStatusButton)
-        public ImageButton syncStatusButton;
+        private HeaderViewHolder(View itemView) {
+            super(itemView);
+            ButterKnife.bind(this, itemView);
+        }
+    }
+
+    static class MainViewHolder extends SectionedViewHolder {
+        @BindView(R.id.thumbnail)
+        public ImageView image;
 
-        @Nullable
         @BindView(R.id.counterLayout)
         public LinearLayout counterBar;
 
-        @Nullable
         @BindView(R.id.counter)
         public TextView counterValue;
 
-        @Nullable
         @BindView(R.id.thumbnailDarkener)
         public ImageView thumbnailDarkener;
 
-        @Nullable
-        @BindView(R.id.header_container)
-        public RelativeLayout mainHeaderContainer;
-
         private MainViewHolder(View itemView) {
             super(itemView);
             ButterKnife.bind(this, itemView);