Where to call Handler Class's constructor in activity lifecycle

Question

I'm a beginner to android, so sorry in advance for any mistakes.

So I have an activity in which I have a handler to execute a message. Now I don't know where should I call the constructor of this handler in the activity life cycle. Should it be in the activity's constructor or onCreate() or onInit(), which one would be most suitable. I have this handler's static object to be initialised so I guess it won't be suitable to call it in activity's constructor. Please help.

score 2 · Accepted Answer · answered Feb 08 '19 at 14:48

There is no method called onInit in Activity's life cycle and we do not use a constructor in Activity either .

Activity is a component of android its object is initialize by OS itself whenever we call startActivity.

Now for your answer you can initialize Handler inside #onCreate(). You can also use runOnUiThread for limited purpose. Try not to use static properties .

class A extends AppCompatActivity{
    private Handler handler;
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        //Other stuff
        handler=new Handler();
    }
}

Where to call Handler Class's constructor in activity lifecycle

1 Answers1