examples/tv-app/android/App/platform-app/src/main/java/com/matter/tv/server/MainActivity.java

package com.matter.tv.server;

import android.os.Bundle;
import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.Fragment;
import com.google.android.material.bottomnavigation.BottomNavigationView;
import com.matter.tv.server.fragments.ContentAppFragment;
import com.matter.tv.server.fragments.QrCodeFragment;
import com.matter.tv.server.fragments.TerminalFragment;
import com.matter.tv.server.service.MatterServant;
import java.util.LinkedHashMap;

public class MainActivity extends AppCompatActivity {

  private LinkedHashMap<String, String> packages = new LinkedHashMap<>();

  private BottomNavigationView.OnNavigationItemSelectedListener navListener =
      item -> {
        Fragment selectedFragment = null;
        switch (item.getItemId()) {
          case R.id.content_app:
            selectedFragment = ContentAppFragment.newInstance();
            break;
          case R.id.qr_code:
            selectedFragment = QrCodeFragment.newInstance();
            break;
          case R.id.terminal:
            selectedFragment = TerminalFragment.newInstance();
            break;
        }

        getSupportFragmentManager()
            .beginTransaction()
            .replace(R.id.fragment_container_view, selectedFragment)
            .commit();
        return true;
      };

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    // MainActivity is needed to launch dialog prompt
    // in UserPrompter
    MatterServant.get().setActivity(this);

    BottomNavigationView bottomNavigationView = findViewById(R.id.bottom_navigation);
    bottomNavigationView.setOnItemSelectedListener(navListener);

    getSupportFragmentManager()
        .beginTransaction()
        .replace(R.id.fragment_container_view, new QrCodeFragment())
        .commit();
  }
}