安卓开发学习笔记—————《Anroid编程权威指南》使用RecyclerView显示列表

使用抽象activity托管fragment

抽象activity类

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();
        }
    }
}