The beforeBindView () callback method has been added to CoreView; the register method of ViewModelEventBus has been modified, which makes it occupy less memory.

Author: ncoxs269

mvvm/src/main/java/com/wutaodsg/mvvm/core/BaseMVVMActivity.java

@@ -32,6 +32,7 @@ public abstract class BaseMVVMActivity<VM extends BaseViewModel, DB extends View
     @Override
     protected void onCreate(@Nullable Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
+        beforeBindView();
         mBaseViewProxy = new BaseViewProxy<>(this, this, newViewModel());
     }
 
@@ -82,6 +83,12 @@ public VM newViewModel() {
         return null;
     }
 
+    @Override
+    @CallSuper
+    public void beforeBindView() {
+
+    }
+
     @Override
     @CallSuper
     public void beforeDetach() {

mvvm/src/main/java/com/wutaodsg/mvvm/core/BaseMVVMFragment.java

@@ -40,6 +40,7 @@ public abstract class BaseMVVMFragment<VM extends BaseViewModel, DB extends View
     @Override
     public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle
             savedInstanceState) {
+        beforeBindView();
         return inflater.inflate(getLayoutResId(), container, false);
     }
 
@@ -97,6 +98,12 @@ public VM newViewModel() {
         return null;
     }
 
+    @Override
+    @CallSuper
+    public void beforeBindView() {
+
+    }
+
     @Override
     @CallSuper
     public void beforeDetach() {

mvvm/src/main/java/com/wutaodsg/mvvm/core/CoreView.java

@@ -32,8 +32,14 @@ public interface CoreView<VM extends BaseViewModel, DB extends ViewDataBinding>
     VM newViewModel();
 
     /**
-     * 这个方法将在 View 被销毁时，解绑 ViewModel 和 DataBinding 之前被回调。
-     * 因此这允许你在解绑之前做一些数据保存等的工作。
+     * 这个方法将在 View 绑定 UI 视图（也就是 Layout XML 文件）之前调用。
+     * 此时，ViewModel 和 DataBinding 也都还没有绑定。
+     */
+    void beforeBindView();
+
+    /**
+     * 这个方法将在 View 被销毁时（一般是 onDestroy() 方法被调用的时候），
+     * 解绑 ViewModel 和 DataBinding 之前被回调。因此这允许你在解绑之前做一些数据保存等的工作。
      */
     void beforeDetach();
 

mvvm/src/main/java/com/wutaodsg/mvvm/util/vmeventbus/ViewModelEventBus.java

@@ -104,7 +104,7 @@ public <T> boolean register(@NonNull String eventTag,
                 eventMap.put(dataClass, viewModelCommands);
             }
         } else {
-            eventMap = new ConcurrentHashMap<>();
+            eventMap = new ConcurrentHashMap<>(2);
             CopyOnWriteArrayList<ViewModelCommand> viewModelCommands = new CopyOnWriteArrayList<>();
             viewModelCommands.add(command);
             eventMap.put(dataClass, viewModelCommands);
@@ -148,7 +148,7 @@ public boolean register(@NonNull String eventTag,
                 eventMap.put(NoDataEventType.class, viewModelCommands);
             }
         } else {
-            eventMap = new ConcurrentHashMap<>();
+            eventMap = new ConcurrentHashMap<>(2);
             CopyOnWriteArrayList<ViewModelCommand> viewModelCommands = new CopyOnWriteArrayList<>();
             viewModelCommands.add(command);
             eventMap.put(NoDataEventType.class, viewModelCommands);