使用抽象activity托管fragment

抽象activity類

public abstract class SingleFragmentActivity extends AppCompatActivity {

    protected  abstract Fragment createFragment();

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

        FragmentManager fm=getSupportFragmentManager();
        Fragment fragment=fm.findFragmentById(R.id.fragment_container);

        if(fragment==null) {
            fragment=createFragment();
            fm.beginTransaction().add(R.id.fragment_container,fragment).commit();
        }
    }
}

安卓開發學習筆記—————《Anroid編程權威指南》使用RecyclerView顯示列表