adding support action bar

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

@@ -8,6 +8,7 @@ import android.view.View;
 import android.widget.ImageButton;
 import android.widget.TextView;
 
+import com.google.android.material.appbar.MaterialToolbar;
 import com.google.android.material.textfield.TextInputEditText;
 
 import java.text.NumberFormat;
@@ -26,6 +27,13 @@ public class CartActivity extends AppCompatActivity {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_cart);
 
+        MaterialToolbar toolbars = findViewById(R.id.cAppBar);
+        setSupportActionBar(toolbars);
+        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
+        getSupportActionBar().setDisplayShowHomeEnabled(true);
+        getSupportActionBar().setTitle("Checkout");
+        toolbars.setNavigationOnClickListener(view -> onBackPressed());
+
         btMinus = findViewById(R.id.btMinus);
         btPlus = findViewById(R.id.btPlus);
         btDelete = findViewById(R.id.btDelete);