update

.idea/misc.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" project-jdk-name="1.8" project-jdk-type="JavaSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_7" project-jdk-name="1.8" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/build/classes" />
   </component>
   <component name="ProjectType">

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

@@ -2,6 +2,7 @@ package com.yono.messeripos;
 
 import androidx.appcompat.app.AppCompatActivity;
 
+import android.annotation.SuppressLint;
 import android.os.Bundle;
 import android.view.View;
 import android.widget.ImageButton;
@@ -18,7 +19,7 @@ public class CartActivity extends AppCompatActivity {
     TextInputEditText tiQty;
     TextView tvQtyView, tvPrice, tvTotal;
 
-    private int counter;
+    public int counter, prices;
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
@@ -35,8 +36,12 @@ public class CartActivity extends AppCompatActivity {
         tvTotal = findViewById(R.id.tvTotal);
 
         counter = Integer.parseInt(tvQtyView.getText().toString());
+        prices = Integer.parseInt(tvPrice.getText().toString());
+
+        tvTotal.setText(setToRp().format((double) Integer.parseInt(tvTotal.getText().toString())));
 
         btMinus.setOnClickListener(new View.OnClickListener() {
+            @SuppressLint("SetTextI18n")
             @Override
             public void onClick(View view) {
                 if (counter > 1){
@@ -46,11 +51,11 @@ public class CartActivity extends AppCompatActivity {
 
                     countTotal();
                 }
-
             }
         });
 
         btPlus.setOnClickListener(new View.OnClickListener() {
+            @SuppressLint("SetTextI18n")
             @Override
             public void onClick(View view) {
                 counter++;
@@ -63,19 +68,22 @@ public class CartActivity extends AppCompatActivity {
     }
 
     private void countTotal() {
-        int price = Integer.parseInt(tvPrice.getText().toString());
+        int price = prices;
         int qtyView = Integer.parseInt(tvQtyView.getText().toString());
         int count = price*qtyView;
-        String result = Integer.toString(price*qtyView);
+//        String result = Integer.toString(price*qtyView);
 
 //        set to view
         tvTotal.setText(setToRp().format((double) count));
     }
 
+    public void setRp() {
+
+    }
+
     private NumberFormat setToRp() {
         Locale ID = new Locale("in", "ID");
 
-        NumberFormat formatRp = NumberFormat.getCurrencyInstance(ID);
-        return formatRp;
+        return NumberFormat.getCurrencyInstance(ID);
     }
 }
\ No newline at end of file

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

@@ -25,7 +25,7 @@ public class MainActivity extends AppCompatActivity {
             w.setFlags(WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS, WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS);
         }
 
-        Toolbar toolbar = findViewById(R.id.app_bar);
+//        Toolbar toolbar = findViewById(R.id.app_bar);
     }
 
     @Override