ViewBinding封装基类(BaseActivity,BaseFragment)

//混淆规则

-keep class  包名.databinding.* {*;}

BaseActivity:

public class BaseActivity<T extends ViewBinding> extends AppCompatActivity {
    protected T binding;
    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Type superclass = getClass().getGenericSuperclass();
        Class<?> aClass = (Class<?>) ((ParameterizedType) superclass).getActualTypeArguments()[0];
        try {
            Method method = aClass.getDeclaredMethod("inflate", LayoutInflater.class);
            binding = (T) method.invoke(null, getLayoutInflater());
            setContentView(binding.getRoot());
        } catch (NoSuchMethodException | IllegalAccessException| InvocationTargetException e) {
            e.printStackTrace();
        }
    }
}

使用 泛型传入ViewBinding即可：

public class MainActivity extends BaseActivity<ActivityMainBinding> {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        // binding.button1 ……
      
    }

}

BaseFragment

public class BaseFragment<T extends ViewBinding> extends Fragment {
    protected T binding;
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        Type superclass = getClass().getGenericSuperclass();
        Class<?> aClass = (Class<?>) ((ParameterizedType) superclass).getActualTypeArguments()[0];
        try {
            Method method = aClass.getDeclaredMethod("inflate", LayoutInflater.class,ViewGroup.class,boolean.class);
            binding = (T) method.invoke(null, getLayoutInflater(),container,false);
        } catch (NoSuchMethodException | IllegalAccessException| InvocationTargetException e) {
            e.printStackTrace();
        }
        return binding.getRoot();
    }
}

使用：

public class BlankFragment extends BaseFragment<FragmentBlankBinding> {
    @Override
    public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        //binding.textView ……
    }
}

kotlin的写法：

open class BaseActivity<VB:ViewBinding> :AppCompatActivity() {
    protected val binding: VB by lazy {
        //使用反射得到viewbinding的class
        val type = javaClass.genericSuperclass as ParameterizedType
        val aClass = type.actualTypeArguments[0] as Class<*>
        val method = aClass.getDeclaredMethod("inflate", LayoutInflater::class.java)
        method.invoke(null, layoutInflater) as VB
    }

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(binding.root)
    }
}

open class BaseFragment<VB:ViewBinding>:Fragment(){

    lateinit var binding: VB

    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
        val type = javaClass.genericSuperclass as ParameterizedType
        val aClass = type.actualTypeArguments[0] as Class<*>
        val method = aClass.getDeclaredMethod("inflate", LayoutInflater::class.java,ViewGroup::class.java,Boolean::class.java)
        binding = method.invoke(null,layoutInflater,container,false) as VB
        return binding.root
    }
}