组件化之路 - ViewBinding基类封装

既然已经对 ViewBinding一知半解，那么接下来肯定是要集成到项目中跑起来，所以此篇主讲关于ViewBinding集成在基类的具体方式~

兄弟篇

组件化之路 - ViewBinding一知半解
组件化之路 - ViewBinding基类封装

我看了看网上关于ViewBinding基类集成，一般都是通过反射、非反射的方法去集成基类，进行使用的 > <

我自己稍作总结后，得出以下结论，通篇也以此结论进行说明

关于ViewBinding基类集成，主要集成有俩种方式

常规写法，手动通过原始代码封装Base基类，达到基类封装效果，从而运用到自己的项目
三方框架，如加入 ViewBindingKTX 框架，包体积虽有增大，但作者能解决一些自己后续会遇到或忽略的问题 (起初是我朋友推荐，后来在知乎看到了原作者也在推荐)

关于ViewBinding基类集成，主要集成有俩种用法

非反射（不使用反射，常规写法）
反射（如果代码混淆的话，容易出现找不到类的场景）

关于ViewBinding基类集成，主要集成有俩种开发语言

Java
Kotlin

因为我用Kotlin经验还不足，所以我自己写了一下Java - BaseActivity基类封装 ~

常规集成（不使用反射）
- Java - BaseActivity
- Kotlin - BaseActivity
- Kotlin - BaseFragment
反射集成
- Java - BaseActivity
- Java - BaseFragment
- Kotlin - BaseActivity
- Kotlin - BaseFragment
三方框架
- Feature
- 基础配置
- Java改造基类
- - 不使用反射
  - 反射

常规集成（不使用反射）

关于ViewBinding基类封装的很多知识，借鉴了此篇 blog 的尾部代码（当然，这类型代码太常见了，至少我看到多篇相似的封装方式，不过一点儿都不影响我的学习热情，加油） ~

Java - BaseActivity

这种方式，也是我在项目中使用的方式，经本人亲自尝试，可用 ~ 但要注意ViewBinding在不同场景的使用方式有所不同，此处仅作用于Activity相关组件, 如不懂可前往ViewBinding继续进阶 ~

//基类封装
public abstract class BaseBindingActivity<T extends ViewBinding>  extends AppCompatActivity {private T mBinding;@Overrideprotected void onCreate(@Nullable Bundle savedInstanceState) {super.onCreate(savedInstanceState);mBinding = getViewBinding();setContentView(mBinding.getRoot());}public abstract T getViewBinding();
}//使用方式
public class MainActivity extends AppCompatActivity {private ActivityMainBinding mBinding;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);mBinding.textView.text = "冲刺把，卡布达~"}@Overridepublic ViewBinding getViewBinding() {mBinding = ActivityMainBinding.inflate(getLayoutInflater());return mBinding;}
}

Kotlin - BaseActivity

//基类封装
abstract class BaseActivity<T : ViewBinding> : AppCompatActivity() {private lateinit var _binding: Tprotected val binding get() = _binding;override fun onCreate(savedInstanceState: Bundle?) {super.onCreate(savedInstanceState)_binding = getViewBinding()setContentView(_binding.root)}protected abstract fun getViewBinding(): T
}//使用方式
class MainActivity : BaseActivity<ActivityMainBinding>() {override fun onCreate(savedInstanceState: Bundle?) {super.onCreate(savedInstanceState)binding.textView.text = "这是MainActivity"}override fun getViewBinding() = ActivityMainBinding.inflate(layoutInflater)
}

Kotlin - BaseFragment

//基类封装
abstract class BaseFragment<T : ViewBinding> : Fragment() {private lateinit var _binding: Tprotected val binding get() = _binding;override fun onCreateView(inflater: LayoutInflater,container: ViewGroup?,savedInstanceState: Bundle?): View? {_binding = getViewBinding(inflater, container)return _binding.root}protected abstract fun getViewBinding(inflater: LayoutInflater, container: ViewGroup?): T
}//使用方式
class FirstFragment : BaseFragment<FragmentFirstBinding>() {override fun onViewCreated(view: View, savedInstanceState: Bundle?) {super.onViewCreated(view, savedInstanceState)binding.textView.text = "这是FirstFragment"}override fun getViewBinding(inflater: LayoutInflater,container: ViewGroup?) = FragmentFirstBinding.inflate(inflater, container, false)
}

反射集成

不推荐使用，会有混淆问题

Java - BaseActivity

//基类封装
public class BaseActivity<T extends ViewBinding> extends AppCompatActivity {protected T viewBinding;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);ParameterizedType type = (ParameterizedType) getClass().getGenericSuperclass();Class cls = (Class) type.getActualTypeArguments()[0];try {Method inflate = cls.getDeclaredMethod("inflate", LayoutInflater.class);viewBinding = (T) inflate.invoke(null, getLayoutInflater());setContentView(viewBinding.getRoot());} catch (NoSuchMethodException | IllegalAccessException| InvocationTargetException e) {e.printStackTrace();}}
}//使用方式
public class MainActivity extends BaseActivity<ActivityMainBinding> {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);viewBinding.button.setText("这是 MainActivity ViewBinding");viewBinding.button.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {Log.d("MainView","点击按钮");}});}
}

Java - BaseFragment

//基类封装
public class BaseFragment<T extends ViewBinding> extends Fragment {protected T viewBinding;@Nullable@Overridepublic View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {ParameterizedType type = (ParameterizedType) getClass().getGenericSuperclass();Class cls = (Class) type.getActualTypeArguments()[0];try {Method inflate = cls.getDeclaredMethod("inflate", LayoutInflater.class, ViewGroup.class, boolean.class);viewBinding = (T) inflate.invoke(null, inflater, container, false);}  catch (NoSuchMethodException | IllegalAccessException| InvocationTargetException e) {e.printStackTrace();}return viewBinding.getRoot();}
}//使用方式
public class MainFragment extends BaseFragment<FragmentMainBinding>{@Overridepublic void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {super.onViewCreated(view, savedInstanceState);viewBinding.button.setText("这是 MainFragment ViewBinding");viewBinding.button.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {Log.d("MainView","点击按钮");}});}
}

Kotlin - BaseActivity

//基类封装
open class BaseActivity<T : ViewBinding> : AppCompatActivity() {protected lateinit var binding: Toverride fun onCreate(savedInstanceState: Bundle?) {super.onCreate(savedInstanceState)val type = javaClass.genericSuperclass as ParameterizedTypeval aClass = type.actualTypeArguments[0] as Class<*>val method = aClass.getDeclaredMethod("inflate", LayoutInflater::class.java)binding = method.invoke(null, layoutInflater) as TsetContentView(binding.root)}
}//使用方式
class MainActivity : BaseActivity<ActivityMainBinding>() {override fun onCreate(savedInstanceState: Bundle?) {super.onCreate(savedInstanceState)binding.textView.text = "这是MainActivity"}
}

Kotlin - BaseFragment

//基类封装
open class BaseFragment<T:ViewBinding>:Fragment(){lateinit var binding: Toverride fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {val type = javaClass.genericSuperclass as ParameterizedTypeval 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 Treturn binding.root}
}//使用方式
class FirstFragment : BaseFragment<FragmentFirstBinding>() {override fun onViewCreated(view: View, savedInstanceState: Bundle?) {super.onViewCreated(view, savedInstanceState)binding.textView.text = "这是FirstFragment"}
}

三方框架

这里使用的主要是 ViewBindingKTX 框架，此处仅介绍简单的使用方式，如有具体需求，可前往原作者的 Github ~

以下部分基本都是copy的原作者，实属无聊，权当记录把...

Feature

支持 Kotlin 和 Java 用法
支持多种使用反射和不使用反射的用法
支持封装改造自己的基类，使其用上 ViewBinding
支持 BaseRecyclerViewAdapterHelper
支持 Activity、Fragment、Dialog、Adapter
支持在 Fragment 自动释放绑定类的实例对象
支持实现自定义组合控件
支持 TabLayout 实现自定义标签布局
支持 NavigationView 设置头部控件
支持 DataBinding 自动设置 lifecycleOwner

基础配置

build（project）

allprojects {repositories {...maven { url 'https://www.jitpack.io' }}
}

build（app）

android {buildFeatures {viewBinding = true}
}dependencies {// 以下都是可选，请根据需要进行添加implementation 'com.github.DylanCaiCoding.ViewBindingKTX:viewbinding-ktx:1.2.4'implementation 'com.github.DylanCaiCoding.ViewBindingKTX:viewbinding-nonreflection-ktx:1.2.4'implementation 'com.github.DylanCaiCoding.ViewBindingKTX:viewbinding-base:1.2.4'implementation 'com.github.DylanCaiCoding.ViewBindingKTX:viewbinding-brvah:1.2.4'
}

Java改造基类

因对于Kotlin还不熟，所以仅copy - Java改造基类做个记录，有需要看Ktolin改造基类的话，直接跳这里看Ktolin封装的基类把 ~

不使用反射

Activity

public abstract class BaseBindingActivity<VB extends ViewBinding> extends AppCompatActivity {private VB binding;@Overrideprotected void onCreate(@Nullable Bundle savedInstanceState) {super.onCreate(savedInstanceState);binding = onCreateViewBinding(getLayoutInflater());setContentView(binding.getRoot());}protected abstract VB onCreateViewBinding(@NonNull LayoutInflater layoutInflater);public VB getBinding() {return binding;}
}//使用方式
public class MainActivity extends BaseBindingActivity<ActivityMainBinding> {@Overrideprotected ActivityMainBinding onCreateViewBinding(@NonNull LayoutInflater layoutInflater) {return ActivityMainBinding.inflate(layoutInflater);}@Overrideprotected void onCreate(@Nullable Bundle savedInstanceState) {super.onCreate(savedInstanceState);getBinding().getTvHelloWord().setText("Hello Android!");}
}

Fragment

public abstract class BaseBindingFragment<VB extends ViewBinding> extends Fragment {private VB binding;@Nullable@Overridepublic View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {binding = onCreateViewBinding(inflater, container);return binding.getRoot();}@Overridepublic void onDestroyView() {super.onDestroyView();binding = null;}public VB getBinding() {return binding;}protected abstract VB onCreateViewBinding(@NonNull LayoutInflater inflater, @Nullable ViewGroup parent);
}//使用方式
public class HomeFragment extends BaseBindingFragment<FragmentHomeBinding> {@Overrideprotected FragmentHomeBinding onCreateViewBinding(@NonNull LayoutInflater inflater, @Nullable ViewGroup parent) {return FragmentHomeBinding.inflate(inflater, parent, false);}@Overridepublic void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {super.onViewCreated(view, savedInstanceState);getBinding().getTvHelloWord().setText("Hello Android!");}
}

Adapter

public abstract class BaseBindingQuickAdapter<T, VB extends ViewBinding>extends BaseQuickAdapter<T, BaseBindingQuickAdapter.BaseBindingHolder> {public BaseBindingQuickAdapter() {this(-1);}public BaseBindingQuickAdapter(@LayoutRes int layoutResId) {super(-layoutResId);}@NotNull@Overrideprotected BaseBindingHolder onCreateDefViewHolder(@NotNull ViewGroup parent, int viewType) {return new BaseBindingHolder(onCreateViewBinding(LayoutInflater.from(parent.getContext()), parent));}protected abstract VB onCreateViewBinding(@NonNull LayoutInflater inflater, @NonNull ViewGroup parent);public static class BaseBindingHolder extends BaseViewHolder {private final ViewBinding binding;public BaseBindingHolder(@NotNull View view) {this(() -> view);}public BaseBindingHolder(@NotNull ViewBinding binding) {super(binding.getRoot());this.binding = binding;}@NonNull@SuppressWarnings("unchecked")public <VB extends ViewBinding> VB getViewBinding() {return (VB) binding;}}
}//使用方式
public class FooAdapter extends BaseBindingQuickAdapter<Foo, ItemFooBinding> {@Overrideprotected ItemFooBinding onCreateViewBinding(@NonNull LayoutInflater inflater, @NonNull ViewGroup parent) {return ItemFooBinding.inflate(inflater, parent, false);}@Overrideprotected void convert(@NotNull BaseBindingHolder holder, Foo item) {ItemFooBinding binding = holder.getViewBinding();binding.tvFoo.setText(item.getValue());}
}

MultiType

public abstract class BindingViewDelegate<T, VB extends ViewBinding> extendsItemViewDelegate<T, BindingViewDelegate.BindingViewHolder<VB>> {@NotNull@Overridepublic BindingViewHolder<VB> onCreateViewHolder(@NotNull Context context, @NotNull ViewGroup parent) {return new BindingViewHolder<>(onCreateViewBinding(LayoutInflater.from(parent.getContext()), parent));}protected abstract VB onCreateViewBinding(@NonNull LayoutInflater inflater, @NonNull ViewGroup parent);public static class BindingViewHolder<VB extends ViewBinding> extends RecyclerView.ViewHolder {private final VB binding;public BindingViewHolder(@NonNull VB binding) {super(binding.getRoot());this.binding = binding;}@NonNullpublic VB getBinding() {return binding;}}
}//使用方式
public class FooViewDelegate extends BindingViewDelegate<Foo, ItemFooBinding> {@Overrideprotected ItemFooBinding onCreateViewBinding(@NonNull LayoutInflater inflater, @NonNull ViewGroup parent) {return ItemFooBinding.inflate(inflater, parent, false);}@Overridepublic void onBindViewHolder(@NotNull BindingViewHolder<ItemFooBinding> holder, Foo foo) {holder.getBinding().tvFoo.setText(item.getValue());}
}

反射

Activity

public abstract class BaseBindingActivity<VB extends ViewBinding> extends AppCompatActivity {private VB binding;@Overrideprotected void onCreate(@Nullable Bundle savedInstanceState) {super.onCreate(savedInstanceState);binding = ViewBindingUtil.inflateWithGeneric(this, getLayoutInflater());setContentView(binding.getRoot());}public VB getBinding() {return binding;}
}//使用方式
public class MainActivity extends BaseBindingActivity<ActivityMainBinding>{@Overrideprotected void onCreate(@Nullable Bundle savedInstanceState) {super.onCreate(savedInstanceState);getBinding().getTvHelloWord().setText("Hello Android!");}
}

Fragment

public abstract class BaseBindingFragment<VB extends ViewBinding> extends Fragment {private VB binding;@Nullable@Overridepublic View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {binding = ViewBindingUtil.inflateWithGeneric(this, getLayoutInflater(), container, false);return binding.getRoot();}@Overridepublic void onDestroyView() {super.onDestroyView();binding = null;}public VB getBinding() {return binding;}
}//使用方式
class HomeFragment extends BaseBindingFragment<FragmentHomeBinding> {@Overridepublic void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {super.onViewCreated(view, savedInstanceState);getBinding().tvHelloWorld.setText("Hello Android!");}
}

Adapter

public abstract class BaseBindingQuickAdapter<T, VB extends ViewBinding>extends BaseQuickAdapter<T, BaseBindingQuickAdapter.BaseBindingHolder> {public BaseBindingQuickAdapter() {this(-1);}public BaseBindingQuickAdapter(@LayoutRes int layoutResId) {super(layoutResId);}@NotNull@Overrideprotected BaseBindingHolder onCreateDefViewHolder(@NotNull ViewGroup parent, int viewType) {VB viewBinding = ViewBindingUtil.inflateWithGeneric(this, parent);return new BaseBindingHolder(viewBinding);}public static class BaseBindingHolder extends BaseViewHolder {private final ViewBinding binding;public BaseBindingHolder(@NotNull View view) {this(() -> view);}public BaseBindingHolder(@NotNull ViewBinding binding) {super(binding.getRoot());this.binding = binding;}@NonNull@SuppressWarnings("unchecked")public <VB extends ViewBinding> VB getViewBinding() {return (VB) binding;}}
}//使用方式
class FooAdapter extends BaseBindingQuickAdapter<Foo, ItemFooBinding> {@Overridepublic void convert(@NotNull BindingViewHolder<ItemFooBinding> holder, Foo item) {ItemFooBinding binding = holder.getViewBinding();binding.tvFoo.setText(item.getValue());}
}

MultiType

public abstract class BindingViewDelegate<T, VB extends ViewBinding> extendsItemViewDelegate<T, BindingViewDelegate.BindingViewHolder<VB>> {@NotNull@Overridepublic BindingViewHolder<VB> onCreateViewHolder(@NotNull Context context, @NotNull ViewGroup parent) {return new BindingViewHolder<>(ViewBindingUtil.inflateWithGeneric(this, parent));}public static class BindingViewHolder<VB extends ViewBinding> extends RecyclerView.ViewHolder {private final VB binding;public BindingViewHolder(@NonNull VB binding) {super(binding.getRoot());this.binding = binding;}@NonNullpublic VB getBinding() {return binding;}}
}//使用方式
class FooViewDelegate extends BindingViewDelegate<Foo, ItemFooBinding> {@Overridepublic void onBindViewHolder(@NotNull BindingViewHolder<ItemFooBinding> holder, Foo item) {holder.getBinding().tvFoo.setText(item.getValue());}
}