MainActivity.java 文件源码

@Override
protected void onCreate(Bundle savedInstanceState) {
    fragmentManager = getSupportFragmentManager();
    sharedPreferences = PreferenceManager.getDefaultSharedPreferences(this);
    int nightMode = sharedPreferences.getInt(getResources().getString(R.string.key_night_mode),
            AppCompatDelegate.MODE_NIGHT_YES);
    AppCompatDelegate.setDefaultNightMode(nightMode);
    setTheme(R.style.AppTheme_NoActionBar);
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Toolbar toolbar = findViewById(R.id.toolbar);
    setSupportActionBar(toolbar);
    if (findViewById(R.id.main_fragment_container) != null) {
        if (savedInstanceState != null) {
            return;
        }
        SearchFragment searchFragment = new SearchFragment();
        fragmentManager.beginTransaction()
                .add(R.id.main_fragment_container, searchFragment)
                .commit();
    }
}