List view adapter onclick method use in oncreate

Question

My main activity

   public void removefunction(){
    List<CartItem> cartItems = getCartItems(cart);
    cart.remove(cartItems.get(position).getProduct());
    cartItems.remove(position);
    cartItemAdapter.updateCartItems(getCartItems(cart));
    cartItemAdapter.notifyDataSetChanged();
    tvTotalPrice.setText(Constant.CURRENCY+String.valueOf(cart.getTotalPrice().setScale(2, BigDecimal.ROUND_HALF_UP)));
}

Adapter code

 btnremove= (Button) convertView.findViewById(R.id.btnrem);

    btnremove.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            ((ShoppingCartActivity) context).removefunction();


        }
    });

Cause null pointer exception in tvTotalPrice.setText

FATAL EXCEPTION: main Process: com.android.tonyvu.sc.demo, PID: 7601 java.lang.NullPointerException: Attempt to invoke virtual method 'void android.widget.TextView.setText(java.lang.CharSequence)' on a null object reference at com.android.tonyvu.sc.demo.ShoppingCartActivity.removefunction(ShoppingCartActivity.java:263) at com.android.tonyvu.sc.demo.adapter.CartItemAdapter$1.onClick(CartItemAdapter.java:98) at android.view.View.performClick(View.java:6205) at android.widget.TextView.performClick(TextView.java:11103)

score 0 · Accepted Answer · answered Oct 02 '17 at 08:33

0

The ButtonClick event is alright, as your method triggers the setText method. The problem is that your tvTotalPrice-Textview is not set (or wrong set), which is the reason why it is null. That's why you get the NullPointerException.

answered Oct 02 '17 at 08:33

Antonio Vlasic

337
3
15

final TextView tvTotalPrice = (TextView)findViewById(R.id.tvTotalPrice); tvTotalPrice.setText(Constant.CURRENCY+ String.valueOf(cart.getTotalPrice().setScale(2, BigDecimal.ROUND_HALF_UP))); – Hamza Javed Oct 02 '17 at 08:56
Is the TextView in the MainActivity or an item in the ListView? – Antonio Vlasic Oct 02 '17 at 08:59
sir its done thnx alot for ur help – Hamza Javed Oct 02 '17 at 10:57
You're welcome :) Please mark the answer as correct – Antonio Vlasic Oct 02 '17 at 11:56

List view adapter onclick method use in oncreate

1 Answers1