既然已經(jīng)對 ViewBinding一知半解 ，那么接下來肯定是要集成到項目中跑起來，所以此篇主講關(guān)于ViewBinding集成在基類的具體方式~

兄弟篇

• 組件化之路 - ViewBinding一知半解
• 組件化之路 - ViewBinding基類封裝

我看了看網(wǎng)上關(guān)于ViewBinding基類集成，一般都是通過反射、非反射的方法去集成基類，進行使用的 > <

我自己稍作總結(jié)后，得出以下結(jié)論，通篇也以此結(jié)論進行說明

關(guān)于ViewBinding基類集成，主要集成有倆種方式

• 常規(guī)寫法，手動通過原始代碼封裝Base基類，達到基類封裝效果，從而運用到自己的項目
• 三方框架，如加入 ViewBindingKTX 框架，包體積雖有增大，但作者能解決一些自己后續(xù)會遇到或忽略的問題 (起初是我朋友推薦，后來在知乎看到了原作者也在推薦)

關(guān)于ViewBinding基類集成，主要集成有倆種用法

• 非反射（不使用反射，常規(guī)寫法）
• 反射（如果代碼混淆的話，容易出現(xiàn)找不到類的場景）

關(guān)于ViewBinding基類集成，主要集成有倆種開發(fā)語言

• Java
• Kotlin

因為我用Kotlin經(jīng)驗還不足，所以我自己寫了一下Java - BaseActivity基類封裝 ~

• • • • 常規(guī)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
        • 基礎(chǔ)配置
        • Java改造基類
        • • 不使用反射
          • 反射

常規(guī)集成（不使用反射）

關(guān)于ViewBinding基類封裝的很多知識，借鑒了此篇 blog 的尾部代碼（當然，這類型代碼太常見了，至少我看到多篇相似的封裝方式，不過一點兒都不影響我的學習熱情，加油 ） ~

Java - BaseActivity

這種方式，也是我在項目中使用的方式，經(jīng)本人親自嘗試，可用 ~ 但要注意ViewBinding在不同場景的使用方式有所不同，此處僅作用于Activity相關(guān)組件, 如不懂可前往ViewBinding繼續(xù)進階 ~

//基類封裝 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 = "沖刺把，卡布達~"}@Overridepublic ViewBinding getViewBinding() {mBinding = ActivityMainBinding.inflate(getLayoutInflater());return mBinding;} }

Kotlin - BaseActivity

//基類封裝 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 = "這是MainActivity"}override fun getViewBinding() = ActivityMainBinding.inflate(layoutInflater) }

Kotlin - BaseFragment

//基類封裝 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 = "這是FirstFragment"}override fun getViewBinding(inflater: LayoutInflater,container: ViewGroup?) = FragmentFirstBinding.inflate(inflater, container, false) }

---

反射集成

不推薦使用，會有混淆問題

Java - BaseActivity

//基類封裝 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("這是 MainActivity ViewBinding");viewBinding.button.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {Log.d("MainView","點擊按鈕");}});} }

Java - BaseFragment

//基類封裝 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("這是 MainFragment ViewBinding");viewBinding.button.setOnClickListener(new View.OnClickListener() {@Overridepublic void onClick(View view) {Log.d("MainView","點擊按鈕");}});} }

Kotlin - BaseActivity

//基類封裝 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 = "這是MainActivity"} }

Kotlin - BaseFragment

//基類封裝 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 = "這是FirstFragment"} }

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三方框架

這里使用的主要是 ViewBindingKTX 框架，此處僅介紹簡單的使用方式，如有具體需求，可前往原作者的 Github ~

以下部分基本都是copy的原作者，實屬無聊，權(quán)當記錄把...

Feature

• 支持 Kotlin 和 Java 用法
• 支持多種使用反射和不使用反射的用法
• 支持封裝改造自己的基類，使其用上 ViewBinding
• 支持 BaseRecyclerViewAdapterHelper
• 支持 Activity、Fragment、Dialog、Adapter
• 支持在 Fragment 自動釋放綁定類的實例對象
• 支持實現(xiàn)自定義組合控件
• 支持 TabLayout 實現(xiàn)自定義標簽布局
• 支持 NavigationView 設(shè)置頭部控件
• 支持 DataBinding 自動設(shè)置 lifecycleOwner

基礎(chǔ)配置

build（project）

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

build（app）

android {buildFeatures {viewBinding = true} }dependencies {// 以下都是可選，請根據(jù)需要進行添加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改造基類

因?qū)τ贙otlin還不熟，所以僅copy - Java改造基類做個記錄，有需要看Ktolin改造基類的話， 直接跳這里看Ktolin封裝的基類把 ~

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());} }

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