diff --git a/app/src/main/java/com/m2049r/xmrwallet/layout/DiffCallback.java b/app/src/main/java/com/m2049r/xmrwallet/layout/DiffCallback.java
index 0cb84ae..4cd6481 100644
--- a/app/src/main/java/com/m2049r/xmrwallet/layout/DiffCallback.java
+++ b/app/src/main/java/com/m2049r/xmrwallet/layout/DiffCallback.java
@@ -23,6 +23,7 @@ public abstract class DiffCallback<T> extends DiffUtil.Callback {
     public int getNewListSize() {
         return mNewList.size();
     }
+
     public abstract boolean areItemsTheSame(int oldItemPosition, int newItemPosition);
 
     public abstract boolean areContentsTheSame(int oldItemPosition, int newItemPosition);
diff --git a/app/src/main/java/com/m2049r/xmrwallet/layout/NodeInfoAdapter.java b/app/src/main/java/com/m2049r/xmrwallet/layout/NodeInfoAdapter.java
index 31e3f60..fcd2099 100644
--- a/app/src/main/java/com/m2049r/xmrwallet/layout/NodeInfoAdapter.java
+++ b/app/src/main/java/com/m2049r/xmrwallet/layout/NodeInfoAdapter.java
@@ -54,7 +54,7 @@ public class NodeInfoAdapter extends RecyclerView.Adapter<NodeInfoAdapter.ViewHo
     private final List<NodeInfo> nodeItems = new ArrayList<>();
     private final OnInteractionListener listener;
 
-    private Context context;
+    private final Context context;
 
     public NodeInfoAdapter(Context context, OnInteractionListener listener) {
         this.context = context;
@@ -72,23 +72,20 @@ public class NodeInfoAdapter extends RecyclerView.Adapter<NodeInfoAdapter.ViewHo
 
         @Override
         public boolean areItemsTheSame(int oldItemPosition, int newItemPosition) {
-            return mOldList.get(oldItemPosition).equals(
-                    mNewList.get(newItemPosition)
-            );
+            return mOldList.get(oldItemPosition).equals(mNewList.get(newItemPosition));
         }
 
         @Override
         public boolean areContentsTheSame(int oldItemPosition, int newItemPosition) {
             return mOldList.get(oldItemPosition).toNodeString().equals(mNewList.get(newItemPosition).toNodeString())
-                    &&  mOldList.get(oldItemPosition).isSelected() == mNewList.get(newItemPosition).isSelected() ;
+                    && (mOldList.get(oldItemPosition).isSelected() == mNewList.get(newItemPosition).isSelected());
         }
     }
 
     @Override
     public @NonNull
     ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
-        View view = LayoutInflater.from(parent.getContext())
-                .inflate(R.layout.item_node, parent, false);
+        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_node, parent, false);
         return new ViewHolder(view);
     }
 
@@ -111,18 +108,19 @@ public class NodeInfoAdapter extends RecyclerView.Adapter<NodeInfoAdapter.ViewHo
 
     public void setNodes(Collection<NodeInfo> newItemsCollection) {
         List<NodeInfo> newItems;
-        if(newItemsCollection !=null) {
+        if (newItemsCollection != null) {
             newItems = new ArrayList<>(newItemsCollection);
             Collections.sort(newItems, NodeInfo.BestNodeComparator);
         } else {
             newItems = new ArrayList<>();
         }
-        final NodeInfoAdapter.NodeDiff diffCallback = new NodeInfoAdapter.NodeDiff(nodeItems,newItems);
+        final NodeInfoAdapter.NodeDiff diffCallback = new NodeInfoAdapter.NodeDiff(nodeItems, newItems);
         final DiffUtil.DiffResult diffResult = DiffUtil.calculateDiff(diffCallback);
         nodeItems.clear();
         nodeItems.addAll(newItems);
         diffResult.dispatchUpdatesTo(this);
     }
+
     public void setNodes() {
         setNodes(nodeItems);
     }
diff --git a/app/src/main/java/com/m2049r/xmrwallet/layout/TransactionInfoAdapter.java b/app/src/main/java/com/m2049r/xmrwallet/layout/TransactionInfoAdapter.java
index 2e971c1..2699818 100644
--- a/app/src/main/java/com/m2049r/xmrwallet/layout/TransactionInfoAdapter.java
+++ b/app/src/main/java/com/m2049r/xmrwallet/layout/TransactionInfoAdapter.java
@@ -23,6 +23,7 @@ import android.view.ViewGroup;
 import android.widget.ImageView;
 import android.widget.TextView;
 
+import androidx.annotation.NonNull;
 import androidx.core.content.ContextCompat;
 import androidx.recyclerview.widget.DiffUtil;
 import androidx.recyclerview.widget.RecyclerView;
@@ -47,10 +48,10 @@ public class TransactionInfoAdapter extends RecyclerView.Adapter<TransactionInfo
 
     private final SimpleDateFormat DATETIME_FORMATTER = new SimpleDateFormat("yyyy-MM-dd HH:mm");
 
-    private int outboundColour;
-    private int inboundColour;
-    private int pendingColour;
-    private int failedColour;
+    private final int outboundColour;
+    private final int inboundColour;
+    private final int pendingColour;
+    private final int failedColour;
 
     public interface OnInteractionListener {
         void onInteraction(View view, TransactionInfo item);
@@ -59,7 +60,7 @@ public class TransactionInfoAdapter extends RecyclerView.Adapter<TransactionInfo
     private final List<TransactionInfo> infoItems;
     private final OnInteractionListener listener;
 
-    private Context context;
+    private final Context context;
 
     public TransactionInfoAdapter(Context context, OnInteractionListener listener) {
         this.context = context;
@@ -74,7 +75,6 @@ public class TransactionInfoAdapter extends RecyclerView.Adapter<TransactionInfo
         DATETIME_FORMATTER.setTimeZone(tz);
     }
 
-
     private static class TransactionInfoDiff extends DiffCallback<TransactionInfo> {
 
         public TransactionInfoDiff(List<TransactionInfo> oldList, List<TransactionInfo> newList) {
@@ -83,25 +83,23 @@ public class TransactionInfoAdapter extends RecyclerView.Adapter<TransactionInfo
 
         @Override
         public boolean areItemsTheSame(int oldItemPosition, int newItemPosition) {
-            return mOldList.get(oldItemPosition).hash.equals(
-                    mNewList.get(newItemPosition).hash
-            );
+            return mOldList.get(oldItemPosition).hash.equals(mNewList.get(newItemPosition).hash);
         }
 
         @Override
         public boolean areContentsTheSame(int oldItemPosition, int newItemPosition) {
             final TransactionInfo oldItem = mOldList.get(oldItemPosition);
             final TransactionInfo newItem = mNewList.get(newItemPosition);
-            return oldItem.isPending == newItem.isPending
-                    && oldItem.isFailed == newItem.isFailed
-                    && oldItem.direction == newItem.direction;
+            return (oldItem.direction == newItem.direction)
+                    && (oldItem.isPending == newItem.isPending)
+                    && (oldItem.isFailed == newItem.isFailed);
         }
     }
 
+    @NonNull
     @Override
     public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
-        View view = LayoutInflater.from(parent.getContext())
-                .inflate(R.layout.item_transaction, parent, false);
+        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_transaction, parent, false);
         return new ViewHolder(view);
     }
 
@@ -116,14 +114,14 @@ public class TransactionInfoAdapter extends RecyclerView.Adapter<TransactionInfo
     }
 
     public void setInfos(List<TransactionInfo> newItems) {
-        if(newItems == null) {
+        if (newItems == null) {
             newItems = new ArrayList<>();
             Timber.d("setInfos null");
         } else {
             Timber.d("setInfos %s", newItems.size());
         }
         Collections.sort(newItems);
-        final DiffCallback<TransactionInfo> diffCallback = new TransactionInfoAdapter.TransactionInfoDiff(infoItems,newItems);
+        final DiffCallback<TransactionInfo> diffCallback = new TransactionInfoAdapter.TransactionInfoDiff(infoItems, newItems);
         final DiffUtil.DiffResult diffResult = DiffUtil.calculateDiff(diffCallback);
         infoItems.clear();
         infoItems.addAll(newItems);
@@ -132,7 +130,7 @@ public class TransactionInfoAdapter extends RecyclerView.Adapter<TransactionInfo
 
     public void removeItem(int position) {
         List<TransactionInfo> newItems = new ArrayList<>(infoItems);
-        if (newItems.size()>position)
+        if (newItems.size() > position)
             newItems.remove(position);
         setInfos(newItems); // in case the nodeinfo has changed
     }
diff --git a/app/src/main/java/com/m2049r/xmrwallet/layout/WalletInfoAdapter.java b/app/src/main/java/com/m2049r/xmrwallet/layout/WalletInfoAdapter.java
index 514b9a6..b9ad73c 100644
--- a/app/src/main/java/com/m2049r/xmrwallet/layout/WalletInfoAdapter.java
+++ b/app/src/main/java/com/m2049r/xmrwallet/layout/WalletInfoAdapter.java
@@ -24,6 +24,7 @@ import android.view.ViewGroup;
 import android.widget.ImageButton;
 import android.widget.TextView;
 
+import androidx.annotation.NonNull;
 import androidx.appcompat.widget.PopupMenu;
 import androidx.recyclerview.widget.DiffUtil;
 import androidx.recyclerview.widget.RecyclerView;
@@ -64,6 +65,7 @@ public class WalletInfoAdapter extends RecyclerView.Adapter<WalletInfoAdapter.Vi
         TimeZone tz = cal.getTimeZone(); //get the local time zone.
         DATETIME_FORMATTER.setTimeZone(tz);
     }
+
     private static class WalletInfoDiff extends DiffCallback<WalletManager.WalletInfo> {
 
         public WalletInfoDiff(List<WalletManager.WalletInfo> oldList, List<WalletManager.WalletInfo> newList) {
@@ -72,9 +74,7 @@ public class WalletInfoAdapter extends RecyclerView.Adapter<WalletInfoAdapter.Vi
 
         @Override
         public boolean areItemsTheSame(int oldItemPosition, int newItemPosition) {
-            return mOldList.get(oldItemPosition).name.equals(
-                    mNewList.get(newItemPosition).name
-            );
+            return mOldList.get(oldItemPosition).name.equals(mNewList.get(newItemPosition).name);
         }
 
         @Override
@@ -83,6 +83,7 @@ public class WalletInfoAdapter extends RecyclerView.Adapter<WalletInfoAdapter.Vi
         }
     }
 
+    @NonNull
     @Override
     public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
         View view = LayoutInflater.from(parent.getContext())
@@ -105,21 +106,20 @@ public class WalletInfoAdapter extends RecyclerView.Adapter<WalletInfoAdapter.Vi
     }
 
     public void setInfos(List<WalletManager.WalletInfo> newItems) {
-        if(newItems == null) {
+        if (newItems == null) {
             newItems = new ArrayList<>();
             Timber.d("setInfos null");
         } else {
             Timber.d("setInfos %s", newItems.size());
         }
         Collections.sort(newItems);
-        final DiffCallback<WalletManager.WalletInfo> diffCallback = new WalletInfoAdapter.WalletInfoDiff(infoItems,newItems);
+        final DiffCallback<WalletManager.WalletInfo> diffCallback = new WalletInfoAdapter.WalletInfoDiff(infoItems, newItems);
         final DiffUtil.DiffResult diffResult = DiffUtil.calculateDiff(diffCallback);
         infoItems.clear();
         infoItems.addAll(newItems);
         diffResult.dispatchUpdatesTo(this);
     }
 
-
     class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
         final TextView tvName;
         final TextView tvAddress;
@@ -132,35 +132,24 @@ public class WalletInfoAdapter extends RecyclerView.Adapter<WalletInfoAdapter.Vi
             tvName = itemView.findViewById(R.id.tvName);
             tvAddress = itemView.findViewById(R.id.tvAddress);
             ibOptions = itemView.findViewById(R.id.ibOptions);
-            ibOptions.setOnClickListener(new View.OnClickListener() {
-                @Override
-                public void onClick(View view) {
-                    if (popupOpen) return;
-                    //creating a popup menu
-                    PopupMenu popup = new PopupMenu(context, ibOptions);
-                    //inflating menu from xml resource
-                    popup.inflate(R.menu.list_context_menu);
-                    popupOpen = true;
-                    //adding click listener
-                    popup.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
-                        @Override
-                        public boolean onMenuItemClick(MenuItem item) {
-                            if (listener != null) {
-                                return listener.onContextInteraction(item, infoItem);
-                            }
-                            return false;
-                        }
-                    });
-                    //displaying the popup
-                    popup.show();
-                    popup.setOnDismissListener(new PopupMenu.OnDismissListener() {
-                        @Override
-                        public void onDismiss(PopupMenu menu) {
-                            popupOpen = false;
-                        }
-                    });
+            ibOptions.setOnClickListener(view -> {
+                if (popupOpen) return;
+                //creating a popup menu
+                PopupMenu popup = new PopupMenu(context, ibOptions);
+                //inflating menu from xml resource
+                popup.inflate(R.menu.list_context_menu);
+                popupOpen = true;
+                //adding click listener
+                popup.setOnMenuItemClickListener(item -> {
+                    if (listener != null) {
+                        return listener.onContextInteraction(item, infoItem);
+                    }
+                    return false;
+                });
+                //displaying the popup
+                popup.show();
+                popup.setOnDismissListener(menu -> popupOpen = false);
 
-                }
             });
             itemView.setOnClickListener(this);
         }