add empty cart

app/src/main/java/com/yono/messeripos/BottomSheets.java

@@ -64,7 +64,7 @@ public class BottomSheets extends BottomSheetDialogFragment {
 
                 long grossAmount = paymentsModels.getGrossAmount();
                 long input = Long.parseLong(inputAmount.getText().toString());
-                long result = grossAmount - input;
+                long result = input-grossAmount;
 
                 hargaChange.setText(utils.convertPrice("Rp.", result));
 

app/src/main/java/com/yono/messeripos/CartActivity.java

@@ -11,6 +11,7 @@ import android.view.View;
 import android.view.Window;
 import android.view.WindowManager;
 import android.widget.Button;
+import android.widget.ImageView;
 
 import androidx.annotation.RequiresApi;
 import androidx.appcompat.app.AppCompatActivity;
@@ -21,6 +22,7 @@ import androidx.recyclerview.widget.LinearLayoutManager;
 import androidx.recyclerview.widget.RecyclerView;
 
 import com.google.android.material.appbar.MaterialToolbar;
+import com.google.android.material.textview.MaterialTextView;
 import com.yono.messeripos.adapter.CartAdapter;
 import com.yono.messeripos.models.MainViewModelsCart;
 import com.yono.messeripos.models.ProductCartModels;
@@ -39,13 +41,16 @@ public class CartActivity extends AppCompatActivity {
     List<ProductCartModels> dataCart = null;
     public static Boolean statusPost;
     SharedPreferences sharedPreferences;
+    Button btnCheckout;
+    ImageView cartEmptyImage;
+    MaterialTextView cartEmptyText;
 
     @RequiresApi(api = Build.VERSION_CODES.N)
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_cart);
-        Button btnCheckout;
+
         Window w = getWindow();
         w.setFlags(WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS, WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS);
         sharedPreferences = getSharedPreferences(SplashScreen.MY_SHARED_PREFERENCES, Context.MODE_PRIVATE);
@@ -61,6 +66,12 @@ public class CartActivity extends AppCompatActivity {
 
         recyclerView = findViewById(R.id.rvCart);
         btnCheckout = findViewById(R.id.btCheckout);
+        cartEmptyImage = findViewById(R.id.cartEmpty);
+        cartEmptyText = findViewById(R.id.cartEmptyText);
+
+        // set visibility gone for cartEmpty
+        cartEmptyImage.setVisibility(View.GONE);
+        cartEmptyText.setVisibility(View.GONE);
 
         cartAdapter = new CartAdapter();
         LinearLayoutManager llm = new LinearLayoutManager(this);

app/src/main/res/layout/activity_cart.xml

@@ -11,6 +11,24 @@
         android:id="@+id/cAppBar"
         layout="@layout/app_bar"/>
 
+    <ImageView
+        android:id="@+id/cartEmpty"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_centerInParent="true"
+        android:src="@drawable/emptycart"/>
+
+    <com.google.android.material.textview.MaterialTextView
+        android:id="@+id/cartEmptyText"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Cart is empty!"
+        android:layout_below="@id/cartEmpty"
+        android:layout_centerInParent="true"
+        android:textSize="30dp"
+        android:textColor="#61333333"
+        />
+
     <androidx.recyclerview.widget.RecyclerView
         android:id="@+id/rvCart"
         android:layout_width="match_parent"