android - What is the best way of getting / using Context inside AsyncTask? -

i've defined separate thread extending asynctask class. within class perform toasts , dialogs within asynctask's onpostexecute , oncancelled methods. toasts require application's context such need is:

toast.maketext(getapplicationcontext(),"some string",1); 

the dialogs created using alertdialog.builder requires context in constructor. right in thinking context should activity's context? i.e.

alertdialog.builder builder = new alertdialog.builder(getactivity());   

where getactivity user defined class returns current activity. if best way handle situation? creating class getactivity or passing current activity's context asynctask's constructor?

i guess i'm trying understand use of context - have noticed memory leaks can issue (don't understand yet) , how using getapplicationcontext() best approach possible.

simply create asynctask inner class of activity, or pass context constructor of asynctask.

inner class: myactivity.java

public class myactivity extends activity {      // other methods of activity here...       private class mytask extends asynctask<void, void, void> {           protected void doinbackground(void... param) {               publishprogress(...);  // call onprogressupdate();          }           protected void onprogressupdate(void... prog) {               toast.maketext(getactivity(), "text", 1000).show();           }     } } 

constructor: mytask.java

public class mytask extends asynctask<void, void, void> {       context c;       public mytask(context c) {           this.c = c;      }       protected void doinbackground(void... param) {            publishprogress(...);  // call onprogressupdate();      }       protected void onprogressupdate(void... prog) {           toast.maketext(c, "text", 1000).show();      } } 

furthermore, please not forget call .show() on dialog.

alertdialog.builder builder = new alertdialog.builder(getactivity()); builder.show();