new update

app/src/main/AndroidManifest.xml

@@ -20,7 +20,7 @@
         android:roundIcon="@mipmap/ic_launcher_round"
         android:supportsRtl="true"
         android:theme="@style/AppTheme2">
-        <activity android:name=".activities.OrderActivity"></activity>
+        <activity android:name=".activities.OrderActivity" />
         <activity
             android:name=".activities.SkActivity"
             android:screenOrientation="portrait" />

app/src/main/java/com/example/yourcashiertest/activities/MainActivity.java

 package com.example.yourcashiertest.activities;
 
 import androidx.annotation.NonNull;
+import androidx.annotation.RequiresApi;
 import androidx.appcompat.app.AppCompatActivity;
 import androidx.databinding.DataBindingUtil;
 import androidx.lifecycle.ViewModelProvider;
@@ -12,6 +13,7 @@ import android.annotation.SuppressLint;
 
 import android.content.Intent;
 import android.content.SharedPreferences;
+import android.os.Build;
 import android.os.Bundle;
 import android.text.Editable;
 import android.text.TextWatcher;
@@ -30,7 +32,10 @@ import com.example.yourcashiertest.viewmodels.CartViewModel;
 import com.example.yourcashiertest.viewmodels.ProductViewModel;
 
 import java.util.ArrayList;
+import java.util.HashSet;
 import java.util.List;
+import java.util.Set;
+import java.util.stream.Collectors;
 
 
 public class MainActivity extends AppCompatActivity {
@@ -51,6 +56,7 @@ public class MainActivity extends AppCompatActivity {
     CartViewModel cartViewModel;
     boolean added = false;
 
+    @RequiresApi(api = Build.VERSION_CODES.N)
     @SuppressLint("WrongConstant")
     @Override
     protected void onCreate(Bundle savedInstanceState) {
@@ -120,10 +126,12 @@ public class MainActivity extends AppCompatActivity {
         viewModel.getProducts().observe(this, adapter::setProducts);
 
         List<Product> product = DBHelper.getAllProduct(getApplicationContext());
+        Set<String> set = new HashSet<>();
         List<String> category = new ArrayList<>();
         for (int i = 0; i < product.size(); i++){
-            category.add(product.get(i).getCategory());
+            set.add(product.get(i).getCategory());
         }
+        category.addAll(set);
         categoryAdapter.setCategories(category);
         categoryAdapter.setListener(c -> viewModel.filter(c.toLowerCase()));
 

app/src/main/java/com/example/yourcashiertest/daos/TransaksiDao.java

 package com.example.yourcashiertest.daos;
 
+import androidx.room.Dao;
+import androidx.room.Delete;
+import androidx.room.Insert;
+import androidx.room.OnConflictStrategy;
 import androidx.room.Query;
+import androidx.room.Update;
 
 import com.example.yourcashiertest.entities.Transaksi;
 
 import java.util.List;
 
+@Dao
 public interface TransaksiDao {
+    @Query("SELECT * FROM Transaksi")
+    public List<Transaksi> getAll();
 
-    @Query("SELECT * FROM transaksi")
-    public List<Transaksi> getAllTransaksi();
+    @Insert(onConflict = OnConflictStrategy.IGNORE)
+    public void insertTransaksi(Transaksi transaksi);
 
+    @Update
+    public void updateTransaksi(Transaksi transaksi);
+
+    @Delete
+    public void deleteTransaksi(Transaksi transaksi);
 }

app/src/main/java/com/example/yourcashiertest/repositories/TransaksiRepository.java

@@ -2,7 +2,6 @@ package com.example.yourcashiertest.repositories;
 
 import android.app.Application;
 
-import androidx.lifecycle.LiveData;
 
 import com.example.yourcashiertest.daos.TransaksiDao;
 import com.example.yourcashiertest.databases.LocalDatabase;
@@ -17,7 +16,7 @@ public class TransaksiRepository {
     public TransaksiRepository(Application application){
         LocalDatabase db = LocalDatabase.getDatabase(application);
         dao = db.transaksiDao();
-        allTransaksi = dao.getAllTransaksi();
+        allTransaksi = dao.getAll();
     }
 
     public List<Transaksi> getAllTransaksi(){

app/src/main/java/com/example/yourcashiertest/viewmodels/TransaksiViewModel.java

 package com.example.yourcashiertest.viewmodels;
 
+
 import android.app.Application;
 
 import androidx.annotation.NonNull;
 import androidx.lifecycle.AndroidViewModel;
 import androidx.lifecycle.LiveData;
-import androidx.lifecycle.MutableLiveData;
 
 import com.example.yourcashiertest.entities.Transaksi;
 import com.example.yourcashiertest.repositories.TransaksiRepository;
@@ -13,13 +13,11 @@ import com.example.yourcashiertest.repositories.TransaksiRepository;
 import java.util.List;
 
 public class TransaksiViewModel extends AndroidViewModel {
-
-    private MutableLiveData<Transaksi> transaksi = new MutableLiveData<>();
+    private LiveData<List<Transaksi>> list;
     private TransaksiRepository repository;
-    private LiveData<List<Transaksi>> allTransaksi;
 
     public TransaksiViewModel(@NonNull Application application) {
         super(application);
-//        repository =
+        repository = new TransaksiRepository(application);
     }
 }