Write Android app program for cake order and delivery to customers

 It would be a complex task to write a complete program for an Android app for cake ordering and delivery, as it would involve many different components and programming concepts. However, I can provide you an example in pseudocode that describes some of the main features of the app and how they could be implemented.

// MainActivity.java - the main activity of the app

public class MainActivity extends AppCompatActivity {

    // global variables

    private RecyclerView cakeListView;

    private CakeAdapter cakeAdapter;

    private List<Cake> cakes;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_main);

        // initializing global variables

        cakeListView = findViewById(R.id.cake_list);

        cakes = new ArrayList<>();

        cakeAdapter = new CakeAdapter(this, cakes);

        cakeListView.setAdapter(cakeAdapter);

        cakeListView.setLayoutManager(new LinearLayoutManager(this));

        // Retrieve the list of cakes from the server

        new GetCakesTask().execute();

        // when user clicks on a cake, start the CakeDetailActivity

        cakeListView.addOnItemTouchListener(new RecyclerTouchListener(this, cakeListView, new ClickListener() {

            @Override

            public void onClick(View view, int position) {

                Cake cake = cakes.get(position);

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

                intent.putExtra("cake", cake);

                startActivity(intent);

            }

        }));

    }

    private class GetCakesTask extends AsyncTask<Void, Void, List<Cake>> {

        @Override

        protected List<Cake> doInBackground(Void... voids) {

            // retrieve the list of cakes from the server

            //using some http library 

            return cakes;

        }

        @Override

        protected void onPostExecute(List<Cake> cakes) {

            MainActivity.this.cakes.clear();

            MainActivity.this.cakes.addAll(cakes);

            cakeAdapter.notifyDataSetChanged();

        }

    }

}

// CakeDetailActivity.java - the activity that displays the details of a cake

public class CakeDetailActivity extends AppCompatActivity {

    private Cake cake;

    @Override

    protected void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.activity_cake_detail);

        // get the cake from the intent

        cake = getIntent().getParcelableExtra("cake");

        // set the details of the cake in the UI

        ImageView cakeImage = findViewById(R.id.cake_image);

        TextView cakeName = findViewById(R.id.cake_name);

        TextView cakeDescription = findViewById(R.id.cake_description);

        TextView cakePrice = findViewById(R.id.cake_price);

        cakeImage.setImageBitmap(cake.getImage());

        cakeName.setText(cake.getName());

        cakeDescription.setText(cake.getDescription());