CODEWITHSUNDEEP
javaandroid
GurpreetSK95
GurpreetSK95

Reputation: 87

What's the difference between these two pieces of code?

These are two intents which start another activity named StartActivity. They both run in different contexts but are not replaceable.

Intent intent = new Intent(MainActivity.this, StartActivity.class);
startActivity(intent);

and 

Intent intent = new Intent(this, StartActivity.class);
startActivity(intent);

Upvotes: 1

Views: 55

Answers (2)

Simas
Simas

Reputation: 44188

You only need to use MainActivity.this when there are multiple wrapping classes.

E.g. 

public class MainActivity extends AppCompatActivity {

  Runnable runnable = new Runnable() {
    @Override
    public void run() {
      // this refers to the Runnable
      // MainActivity.this refers to the activity
    }
  };

}

Upvotes: 0

CommonsWare
CommonsWare

Reputation: 1007624

You would see the first syntax when this code appears in an inner class of MainActivity, such as the anonymous inner class implementation of View.OnClickListener that you create for a setOnClickListener() call. It says "the this we want is the instance of MainActivity, not the instance of the View.OnClickListener implementation".

Upvotes: 5

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