diff --git a/app/src/main/java/com/example/examengapsi/MainActivity.java b/app/src/main/java/com/example/examengapsi/MainActivity.java
index a41e0d9..eb968f2 100644
--- a/app/src/main/java/com/example/examengapsi/MainActivity.java
+++ b/app/src/main/java/com/example/examengapsi/MainActivity.java
@@ -1,5 +1,6 @@
 package com.example.examengapsi;
 
+import android.annotation.SuppressLint;
 import android.os.AsyncTask;
 import android.os.Bundle;
 
@@ -8,8 +9,8 @@
 import com.example.examengapsi.db.AppDataBase;
 import com.example.examengapsi.model.Producto;
 import com.example.examengapsi.model.SearchHistory;
-import com.google.gson.Gson;
 
+import androidx.annotation.NonNull;
 import androidx.appcompat.app.AlertDialog;
 import androidx.appcompat.app.AppCompatActivity;
 import androidx.appcompat.widget.SearchView;
@@ -19,7 +20,6 @@
 import androidx.recyclerview.widget.LinearLayoutManager;
 import androidx.recyclerview.widget.RecyclerView;
 
-import android.util.Log;
 import android.view.Menu;
 import android.view.MenuItem;
 import android.view.View;
@@ -38,7 +38,6 @@ public class MainActivity extends AppCompatActivity implements MainInterface.Mai
     SearchHistory searchHistory;
     InserBDTask inserBDTask;
     SearchHistoryDBTask searchHistoryDBTask;
-    private List<SearchHistory> listHistory;
     AlertDialog alertDialog;
 
     @Override
@@ -51,7 +50,7 @@ protected void onCreate(Bundle savedInstanceState) {
 
         llEmpty = findViewById(R.id.llEmpty);
 
-        mainPresenter = new MainPresenter(this, this);
+        mainPresenter = new MainPresenter( this);
 
         searchHistory = new SearchHistory();
 
@@ -60,6 +59,7 @@ protected void onCreate(Bundle savedInstanceState) {
 
     }
 
+    @SuppressLint("NotifyDataSetChanged")
     private void createRecyclerView(ArrayList<Producto> products) {
         if (products.size() > 0) llEmpty.setVisibility(View.GONE);
         recyclerView = findViewById(R.id.idRvProducts);
@@ -104,10 +104,8 @@ private void searchProduct(String query) {
     }
 
     @Override
-    public boolean onOptionsItemSelected(MenuItem item) {
-        int id = item.getItemId();
-
-        return super.onOptionsItemSelected(item);
+    public boolean onOptionsItemSelected(@NonNull MenuItem item) {
+           return super.onOptionsItemSelected(item);
     }
 
     @Override
@@ -134,6 +132,7 @@ public void selectItem(String text) {
         searchProduct(text);
     }
 
+    @SuppressLint("StaticFieldLeak")
     private class InserBDTask extends AsyncTask<SearchHistory, Void, Void> {
 
         @Override
@@ -143,12 +142,12 @@ protected Void doInBackground(SearchHistory... searchHistories) {
         }
     }
 
+    @SuppressLint("StaticFieldLeak")
     private class SearchHistoryDBTask extends AsyncTask<Void, Void, List<SearchHistory>> {
 
         @Override
         protected List<SearchHistory> doInBackground(Void... voids) {
-            listHistory = AppDataBase.getAppDB(getApplicationContext()).searchHistoryDAO().findAllHistory();
-            return listHistory;
+            return AppDataBase.getAppDB(getApplicationContext()).searchHistoryDAO().findAllHistory();
         }
 
         @Override
@@ -162,6 +161,7 @@ private void showHistory(List<SearchHistory> searchHistory) {
     }
 
 
+    @SuppressLint("NotifyDataSetChanged")
     private void createRecyclerHistory(List<SearchHistory> searchHistory) {
         if (searchHistory.size() > 0) llEmpty.setVisibility(View.GONE);
         recyclerViewHistory = findViewById(R.id.idRvProducts);
diff --git a/app/src/main/java/com/example/examengapsi/MainPresenter.java b/app/src/main/java/com/example/examengapsi/MainPresenter.java
index e35d727..db11fe5 100644
--- a/app/src/main/java/com/example/examengapsi/MainPresenter.java
+++ b/app/src/main/java/com/example/examengapsi/MainPresenter.java
@@ -2,8 +2,8 @@
 
 import android.content.Context;
 import android.os.Build;
-import android.util.Log;
 
+import androidx.annotation.NonNull;
 import androidx.annotation.RequiresApi;
 
 import com.example.examengapsi.model.Producto;
@@ -15,6 +15,7 @@
 import org.json.JSONObject;
 
 import java.util.ArrayList;
+import java.util.Objects;
 
 import retrofit2.Call;
 import retrofit2.Callback;
@@ -22,14 +23,12 @@
 
 public class MainPresenter implements MainInterface.MainPresenter {
 
-    private Context context;
-    private MainInterface.MainView view;
-    private ApiService apiService;
+    private final MainInterface.MainView view;
+    private final ApiService apiService;
 
-    public MainPresenter(Context context, MainInterface.MainView mainView) {
-        this.context = context;
+    public MainPresenter(MainInterface.MainView mainView) {
         this.view = mainView;
-        apiService = new ApiService().initApiService(context);
+        apiService = new ApiService().initApiService();
     }
 
     @Override
@@ -38,7 +37,7 @@ public void searchProduct(String text) {
         call.enqueue(new Callback<String>() {
             @RequiresApi(api = Build.VERSION_CODES.N)
             @Override
-            public void onResponse(Call<String> call, Response<String> response) {
+            public void onResponse(@NonNull Call<String> call, @NonNull Response<String> response) {
                 if (response.isSuccessful()) {
                     try {
                         if (response.body() != null) {
@@ -46,7 +45,7 @@ public void onResponse(Call<String> call, Response<String> response) {
                             getResultProductos(jsonObject.getJSONObject("plpResults").getJSONArray("records"));
                         }
                     } catch (JSONException e) {
-                        view.resultError(e.getCause().toString(), e.getMessage());
+                        view.resultError(Objects.requireNonNull(e.getCause()).toString(), e.getMessage());
                         e.printStackTrace();
                     }
 
@@ -54,13 +53,15 @@ public void onResponse(Call<String> call, Response<String> response) {
 
             }
 
+            @RequiresApi(api = Build.VERSION_CODES.KITKAT)
             @Override
-            public void onFailure(Call<String> call, Throwable t) {
-                view.resultError(t.getCause().toString(), t.getMessage());
+            public void onFailure(@NonNull Call<String> call, @NonNull Throwable t) {
+                view.resultError(Objects.requireNonNull(t.getCause()).toString(), t.getMessage());
             }
         });
     }
 
+    @RequiresApi(api = Build.VERSION_CODES.KITKAT)
     private void getResultProductos(JSONArray records) {
         ArrayList<Producto> products = new ArrayList<>();
         for (int x = 0; x < records.length(); x++) {
@@ -69,7 +70,7 @@ private void getResultProductos(JSONArray records) {
                 Producto product = new Gson().fromJson(String.valueOf(jsonObject), Producto.class);
                 products.add(product);
             } catch (JSONException e) {
-                view.resultError(e.getCause().toString(), e.getMessage());
+                view.resultError(Objects.requireNonNull(e.getCause()).toString(), e.getMessage());
                 e.printStackTrace();
             }
         }
diff --git a/app/src/main/java/com/example/examengapsi/adapter/ProductsListAdapter.java b/app/src/main/java/com/example/examengapsi/adapter/ProductsListAdapter.java
index 8fc5fd7..f27a5aa 100644
--- a/app/src/main/java/com/example/examengapsi/adapter/ProductsListAdapter.java
+++ b/app/src/main/java/com/example/examengapsi/adapter/ProductsListAdapter.java
@@ -1,5 +1,6 @@
 package com.example.examengapsi.adapter;
 
+import android.annotation.SuppressLint;
 import android.content.Context;
 import android.view.LayoutInflater;
 import android.view.View;
@@ -32,6 +33,7 @@ public ProductsListHolder onCreateViewHolder(@NonNull ViewGroup parent, int view
         return new ProductsListHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.item_producto, parent, false));
     }
 
+    @SuppressLint("SetTextI18n")
     @Override
     public void onBindViewHolder(@NonNull ProductsListHolder holder, int position) {
         holder.idTvPrice.setText(productsList.get(position).getListPrice().toString());
@@ -44,7 +46,7 @@ public int getItemCount() {
         return productsList.size();
     }
 
-    public class ProductsListHolder extends RecyclerView.ViewHolder {
+    public static class ProductsListHolder extends RecyclerView.ViewHolder {
 
         TextView idTvPrice, idTvName;
         ImageView idTvImage;
diff --git a/app/src/main/java/com/example/examengapsi/adapter/SearchHistoryAdapter.java b/app/src/main/java/com/example/examengapsi/adapter/SearchHistoryAdapter.java
index 64e9464..4ffa999 100644
--- a/app/src/main/java/com/example/examengapsi/adapter/SearchHistoryAdapter.java
+++ b/app/src/main/java/com/example/examengapsi/adapter/SearchHistoryAdapter.java
@@ -1,7 +1,7 @@
 package com.example.examengapsi.adapter;
 
+import android.annotation.SuppressLint;
 import android.content.Context;
-import android.util.Log;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -39,7 +39,7 @@ public SearchHistoryAdapter.SearchHistoryHolder onCreateViewHolder(@NonNull View
     }
 
     @Override
-    public void onBindViewHolder(@NonNull SearchHistoryAdapter.SearchHistoryHolder holder, final int position) {
+    public void onBindViewHolder(@NonNull SearchHistoryAdapter.SearchHistoryHolder holder, @SuppressLint("RecyclerView") final int position) {
         holder.text.setText(searchHistory.get(position).getText());
         holder.itemView.setOnClickListener(new View.OnClickListener() {
             @Override
@@ -56,7 +56,7 @@ public int getItemCount() {
         return searchHistory.size();
     }
 
-    public class SearchHistoryHolder extends RecyclerView.ViewHolder {
+    public static class SearchHistoryHolder extends RecyclerView.ViewHolder {
 
         TextView text;
 
diff --git a/app/src/main/java/com/example/examengapsi/db/AppDataBase.java b/app/src/main/java/com/example/examengapsi/db/AppDataBase.java
index 53e72f0..93931b1 100644
--- a/app/src/main/java/com/example/examengapsi/db/AppDataBase.java
+++ b/app/src/main/java/com/example/examengapsi/db/AppDataBase.java
@@ -21,8 +21,4 @@ public static  AppDataBase getAppDB(Context context){
         }
         return INSTANCE;
     }
-
-    public  static  void  destroyBD(){
-        INSTANCE=null;
-    }
 }
diff --git a/app/src/main/java/com/example/examengapsi/model/Producto.java b/app/src/main/java/com/example/examengapsi/model/Producto.java
index 8c9a998..d730283 100644
--- a/app/src/main/java/com/example/examengapsi/model/Producto.java
+++ b/app/src/main/java/com/example/examengapsi/model/Producto.java
@@ -1,9 +1,9 @@
 package com.example.examengapsi.model;
 
 public class Producto {
-    private String productDisplayName;
-    private Double listPrice;
-    private String smImage;
+    private final String productDisplayName;
+    private final Double listPrice;
+    private final String smImage;
 
     public Producto(String productDisplayName, Double listPrice, String smImage) {
         this.productDisplayName = productDisplayName;
@@ -11,18 +11,6 @@ public Producto(String productDisplayName, Double listPrice, String smImage) {
         this.smImage = smImage;
     }
 
-    public void setProductDisplayName(String productDisplayName) {
-        this.productDisplayName = productDisplayName;
-    }
-
-    public void setListPrice(Double listPrice) {
-        this.listPrice = listPrice;
-    }
-
-    public void setSmImage(String smImage) {
-        this.smImage = smImage;
-    }
-
     public String getProductDisplayName() {
         return productDisplayName;
     }
diff --git a/app/src/main/java/com/example/examengapsi/model/SearchHistory.java b/app/src/main/java/com/example/examengapsi/model/SearchHistory.java
index f2f7209..56eca1a 100644
--- a/app/src/main/java/com/example/examengapsi/model/SearchHistory.java
+++ b/app/src/main/java/com/example/examengapsi/model/SearchHistory.java
@@ -9,7 +9,6 @@
 public class SearchHistory {
 
     @PrimaryKey
-    @NonNull
     @ColumnInfo(name="text")
     private String text;
 
diff --git a/app/src/main/java/com/example/examengapsi/service/ApiRoutes.java b/app/src/main/java/com/example/examengapsi/service/ApiRoutes.java
new file mode 100644
index 0000000..e605ab2
--- /dev/null
+++ b/app/src/main/java/com/example/examengapsi/service/ApiRoutes.java
@@ -0,0 +1,12 @@
+package com.example.examengapsi.service;
+
+public class ApiRoutes {
+
+    public static final String URLSERVICE = "https://shoppapp.liverpool.com.mx";
+
+    public static final String SEARCH_PRODUCTS = "/appclienteservices/services/v3/plp";
+    public static final String FORCE_PLP = "force-plp";
+    public static final String QUERY_SEARCH = "search-string";
+    public static final String PAGE_NUMBER = "page-number";
+    public static final String NUM_FOR_ITEM = "number-of-items-per-page";
+}
diff --git a/app/src/main/java/com/example/examengapsi/service/ApiService.java b/app/src/main/java/com/example/examengapsi/service/ApiService.java
index 3042ba0..1bbe6ea 100644
--- a/app/src/main/java/com/example/examengapsi/service/ApiService.java
+++ b/app/src/main/java/com/example/examengapsi/service/ApiService.java
@@ -1,11 +1,6 @@
 package com.example.examengapsi.service;
 
-import android.content.Context;
-
-import com.example.examengapsi.R;
-
-import java.util.HashMap;
-import java.util.Map;
+import static com.example.examengapsi.service.ApiRoutes.URLSERVICE;
 
 import retrofit2.Retrofit;
 import retrofit2.converter.scalars.ScalarsConverterFactory;
@@ -13,31 +8,15 @@
 public class ApiService {
 
     public ApiServiceInterface apiInterface;
-    private String URL = "https://shoppapp.liverpool.com.mx";
-
-    public ApiService() {
-    }
 
-    public ApiService initApiService(Context context) {
+    public ApiService initApiService() {
 
         Retrofit.Builder apiClientConfig = new Retrofit.Builder()
-                .baseUrl(URL)
+                .baseUrl(URLSERVICE)
                 .addConverterFactory(ScalarsConverterFactory.create());
 
         apiInterface = apiClientConfig.build().create(ApiServiceInterface.class);
         return this;
     }
 
-    private static Map<String, String> mapHeaders = null;
-
-    public static Map<String, String> getMapHeaders(Context context) {
-        if (mapHeaders == null) {
-            mapHeaders = new HashMap<>();
-        } else {
-            mapHeaders.clear();
-        }
-        mapHeaders.put("Content-Type", "application/x-www-form-urlencoded");
-        return mapHeaders;
-    }
-
 }
diff --git a/app/src/main/java/com/example/examengapsi/service/ApiServiceInterface.java b/app/src/main/java/com/example/examengapsi/service/ApiServiceInterface.java
index 906dc67..1ad07bf 100644
--- a/app/src/main/java/com/example/examengapsi/service/ApiServiceInterface.java
+++ b/app/src/main/java/com/example/examengapsi/service/ApiServiceInterface.java
@@ -1,22 +1,22 @@
 package com.example.examengapsi.service;
 
-import java.util.Map;
+import static com.example.examengapsi.service.ApiRoutes.FORCE_PLP;
+import static com.example.examengapsi.service.ApiRoutes.NUM_FOR_ITEM;
+import static com.example.examengapsi.service.ApiRoutes.PAGE_NUMBER;
+import static com.example.examengapsi.service.ApiRoutes.QUERY_SEARCH;
+import static com.example.examengapsi.service.ApiRoutes.SEARCH_PRODUCTS;
+
 
 import retrofit2.Call;
-import retrofit2.http.Field;
-import retrofit2.http.FormUrlEncoded;
 import retrofit2.http.GET;
-import retrofit2.http.HeaderMap;
-import retrofit2.http.POST;
-import retrofit2.http.Path;
 import retrofit2.http.Query;
 
 public interface ApiServiceInterface {
 
-    @GET("/appclienteservices/services/v3/plp")
+    @GET(SEARCH_PRODUCTS)
     Call<String> getProductos(
-            @Query("force-plp") Boolean forcePlp,
-            @Query("search-string") String text,
-            @Query("page-number") Integer page,
-            @Query("number-of-items-per-page") Integer items);
+            @Query(FORCE_PLP) Boolean forcePlp,
+            @Query(QUERY_SEARCH) String text,
+            @Query(PAGE_NUMBER) Integer page,
+            @Query(NUM_FOR_ITEM) Integer items);
 }
diff --git a/creadoportfm b/creadoportfm
deleted file mode 100644
index cedf93e..0000000
--- a/creadoportfm
+++ /dev/null
@@ -1 +0,0 @@
-dbnwsbxkjsbxjskabxasxasxasxasxasx