AnonymousClassLeakActivity.java

package pl.pszklarska.leakexample;

public class AnonymousClassLeakActivity extends AppCompatActivity {

    @Override
    protected void onCreate(@Nullable final Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        
        new AsyncTask<Void, Void, Void>() {
            @Override
            protected Void doInBackground(final Void... voids) {
                // Here is operation, which takes a long time...
                Context context = AnonymousClassLeakActivity.this;
                loadMillionCatsPhotos(context);
                return null;
            }
        }.execute();
    }

    private void loadMillionCatsPhotos(Context context) {
        // Cat 1 loading...
        // Cat 2 loading...
    }
}