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Attempt to invoke virtual method 'android.view.View android.view.View.findViewById(int)' [duplicate] This question already has an answer here: It is showing error -> at com.thoughtworks.mythoughtworks.MainActivity.onCreateOptionsMenu(MainActivity.java:66) .It is showing null pointer exception when I load notification badge in onCreateOptionMenu... Please help MainActivity.java public class MainActivity extends AppCompatActivity { ProgressDialog progress; ListView ls; int count = 0; SearchView searchView; NotificationBadge badge; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); ls = (ListView)findViewById(R.id.listView); progress = new ProgressDialog(this); BackgroundTask process = new BackgroundTask(); process.execute(); } @Override public boolean onCreateOptionsMenu(Menu menu) { getMenuInflater().inflate(R.menu.menu_main,menu); View mview = menu.findI...

Updating Values in A Multidimensional Cart Array I am writing a custom shopping cart in PHP, I add product info to the cart session like this: $product_array=array($title,$price,$qty); if(!isset($_SESSION['cart'])) $_SESSION['cart']=array(); if(!in_array($product_array,$_SESSION['cart'])) $_SESSION['cart']=$product_array; else { // update price and quantity here } My challenge: I want to update the price and quantity($qty) of the product if it already exists in $_SESSION['cart'] array rather than adding it. Something like this price = price + $price, qty = qty + $qty 1 Answer 1 This example is similar to your example. you can add code from foreach loop in else condition. I am considering product_id instead of $title variable. $_SESSION['cart'] = [ 'product_id'=> 12, 'price' => 100 , 'quantity' => 2 ]; $_SESSION['...