fixing bug

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

@@ -10,12 +10,14 @@ import android.content.Intent;
 import android.os.Build;
 import android.os.Bundle;
 
+import android.text.TextUtils;
 import android.view.MotionEvent;
 import android.view.View;
 
 import com.example.yourcashiertest.R;
 import com.example.yourcashiertest.databinding.ActivityPaymentBinding;
 import com.example.yourcashiertest.utils.Convert;
+import com.example.yourcashiertest.utils.ViewUtil;
 import com.example.yourcashiertest.viewmodels.CartViewModel;
 
 public class PaymentActivity extends AppCompatActivity {
@@ -48,14 +50,20 @@ public class PaymentActivity extends AppCompatActivity {
             return true;
         });
 
+
+
     }
 
     public void btnPay(View view) {
-        int amountPaid = Integer.parseInt(binding.etAmountPaid.getText().toString());
-        refund = amountPaid - amount;
-        startActivity(new Intent(PaymentActivity.this, StatusPayment.class).putExtra(REFUND, refund));
-        cartViewModel.clear();
-        finish();
+        if (TextUtils.isEmpty(binding.etAmountPaid.getText().toString())){
+            ViewUtil.showMessage(view, "Amount paid not empty");
+        }else {
+            int amountPaid = Integer.parseInt(binding.etAmountPaid.getText().toString());
+            refund = amountPaid - amount;
+            startActivity(new Intent(PaymentActivity.this, StatusPayment.class).putExtra(REFUND, refund));
+            cartViewModel.clear();
+            finish();
+        }
     }