Nsryjdtyk

I want to know what 'this' means in the below Toast command:

Toast.makeText(MainActivity.this, "msg" ,Toast.Length_long ).show();

If possible could you please explain the whole command.

In general when you use construct SomeClass.this that means that you are referring to the specific (frequently 'outer' class). In example you can have a code like:

class Apple { 



void outherMethod() {

}



class AppleType {



    void innerMethod(){}

        void method(){ 

            Apple.this.outerMethod();

        this.innerMethod();

    }

 }

 }

Additionally, in this specific case on Android it means that you are using the activity's Context which is provided via MainActivity class.

So the whole command should be read as:

• Create Toast widget inside context provided by MainActivity


• It should display some text: "msg"


• It should be visible for specific time defined by the constant: Toast.Length_long


• finally, via show() method display it on device.

'this' means itself.

Toast.makeText(MainActivity.this, "msg" ,Toast.Length_long ).show();

Call the toast method, and the required parameters are 'context', 'toast message' and 'toast duration'.

Finally .show() means make toast to show.

its clear and you can use it like this

Toast toast =Toast.makeText(this, "msg", duration);

toast.show();

this: context

"msg": your message

duration: Toast.LENGTH_SHORT or Toast.LENGTH_LONG

and you can change position by setting gravity

toast.setGravity(Gravity.CENTER_VERTICAL|Gravity.CENTER_HORIZONTAL, 0, 0);

this will show toast center screen