有没有办法让react原生android应用程序中的视图组件（由JS编写）更新？

我正在使用react native构建一个android应用程序，我想知道如何解决这种情况：在Java代码中，一些更新必须通知javascript刷新视图

是的，这是可能的。此页面上有更多信息：

您需要使用发射器在JavaScript中发回事件信号

实际上，我还没有在实践中做到这一点，但我很快就会做到。让我知道你进展如何

要使用他们的示例，请在Java中：

...
private void sendEvent(ReactContext reactContext,
                   String eventName,
                   @Nullable WritableMap params) {
  reactContext
  .getJSModule(DeviceEventManagerModule.RCTDeviceEventEmitter.class)
  .emit(eventName, params);
}
...
WritableMap params = Arguments.createMap();
...
sendEvent(reactContext, "keyboardWillShow", params); 

然后在JS中：

var { DeviceEventEmitter } = require('react-native');
...
var ScrollResponderMixin = {
  mixins: [Subscribable.Mixin],

  componentWillMount: function() {
  ...
  this.addListenerOn(DeviceEventEmitter,
                   'keyboardWillShow',
                   this.scrollResponderKeyboardWillShow);
  ...
  },
  scrollResponderKeyboardWillShow:function(e: Event) {
  this.keyboardWillOpenTo = e;
  this.props.onKeyboardWillShow && this.props.onKeyboardWillShow(e);
},

...
componentWillMount: function() {
     DeviceEventEmitter.addListener('keyboardWillShow', function(e: Event) {
      // handle event.
 });
}
...

或者，您可以直接在JS中侦听事件：

var { DeviceEventEmitter } = require('react-native');
...
var ScrollResponderMixin = {
  mixins: [Subscribable.Mixin],

  componentWillMount: function() {
  ...
  this.addListenerOn(DeviceEventEmitter,
                   'keyboardWillShow',
                   this.scrollResponderKeyboardWillShow);
  ...
  },
  scrollResponderKeyboardWillShow:function(e: Event) {
  this.keyboardWillOpenTo = e;
  this.props.onKeyboardWillShow && this.props.onKeyboardWillShow(e);
},

...
componentWillMount: function() {
     DeviceEventEmitter.addListener('keyboardWillShow', function(e: Event) {
      // handle event.
 });
}
...