Android Programming for Beginners

FAQ

1. What is wrong with this method definition?

   doSomething(){
     // Do something here
   }

   No return type is declared. You do not have to return a value from a method, but its return type must be void in this case. This is how the method should look:

   void doSomething(){
     // Do something here
   }

2. What is wrong with this method definition?

   float getBalance(){
     String customerName = "Linus Torvalds";
     float balance = 429.66f;
     return customerName;
   }

   The method returns a String (userName) variable, but the signature states that it must return a float. With a method name like getBalance, this code is probably what was intended:

   float getBalance(){
     String customerName = "Linus Torvalds";
     float balance = 429.66f;
     return balance;
   }

3. When do we call the onCreate method? !Trick ...