从React本机Js代码调用Android Native UI组件方法

发布时间：2020-12-15 20:54:37 所属栏目：百科来源：网络整理

导读：我创建了一个CustomView SignatureView.java,它扩展了LinearLayout以捕获Android Native中的签名. 并创建了SignatureCapturePackage.java和SignatureCaptureViewManager.java public class SignatureCaptureMainView extends LinearLayout { .... public voi

我创建了一个CustomView SignatureView.java,它扩展了LinearLayout以捕获Android Native中的签名.

并创建了SignatureCapturePackage.java和SignatureCaptureViewManager.java

public class SignatureCaptureMainView extends LinearLayout {

     .... 

    public void saveImage(){
               //Save image to file 
     }
}

这个Package类

public class SignatureCapturePackage implements ReactPackage {
      private Activity mCurrentActivity;

      public RSSignatureCapturePackage(Activity activity) {
        mCurrentActivity = activity;
      }

      @Override
      public List<NativeModule> createNativeModules(ReactApplicationContext reactContext) {
        return Arrays.<NativeModule>asList();
      }

      @Override
      public List<ViewManager> createViewManagers(ReactApplicationContext reactApplicationContext) {
        return Arrays.<ViewManager>asList(new SignatureCaptureViewManager(mCurrentActivity));
      }

      @Override
      public List<Class<? extends JavaScriptModule>> createJSModules() {
        return Arrays.asList();
      }
    }

这是ViewManager类

public class SignatureCaptureViewManager extends      ViewGroupManager<SignatureCaptureMainView> {
    private Activity mCurrentActivity;

    public static final String PROPS_SAVE_IMAGE_FILE="saveImageFileInExtStorage";
    public static final String PROPS_VIEW_MODE = "viewMode";

    public RSSignatureCaptureViewManager(Activity activity) {
        mCurrentActivity = activity;
    }

    @Override
    public String getName() {
        return "SignatureView";
    }

    @ReactProp(name = PROPS_SAVE_IMAGE_FILE)
    public void setSaveImageFileInExtStorage(SignatureCaptureMainView view,@Nullable Boolean saveFile) {
        Log.d("React View manager setSaveFileInExtStorage:","" + saveFile);
        if(view!=null){
            view.setSaveFileInExtStorage(saveFile);
        }
    }

    @ReactProp(name = PROPS_VIEW_MODE)
    public void setViewMode(SignatureCaptureMainView view,@Nullable String viewMode) {
        Log.d("React View manager setViewMode:","" + viewMode);
        if(view!=null){
            view.setViewMode(viewMode);
        }
    }

    @Override
    public SignatureCaptureMainView createViewInstance(ThemedReactContext context) {
        Log.d("React"," View manager createViewInstance:");
        return new SignatureCaptureMainView(context,mCurrentActivity);
    }


  }

这是Signature.js包

var React = require('react-native');
  var {
    PropTypes,requireNativeComponent,View,} = React;

  class SignatureCapture extends React.Component {

    constructor() {
      super();
      this.onChange = this.onChange.bind(this);
    }

    onChange(event) {
      console.log("Signature  ON Change Event");
      if (!this.props.onSaveEvent) {
        return;
      }

      this.props.onSaveEvent({
        pathName: event.nativeEvent.pathName,encoded: event.nativeEvent.encoded,});
    }

    render() {
      return (
        <SignatureView {...this.props} style={{flex: 1}} onChange={this.onChange} />
      );
    }

    save(){

    }
  }

  SignatureCapture.propTypes = {
    ...View.propTypes,saveImageFileInExtStorage: PropTypes.bool,viewMode:PropTypes.string
  };

  var SignatureView = requireNativeComponent('SignatureView',SignatureCapture,{
    nativeOnly: {onChange: true}
  });

  module.exports = SignatureCapture;

我在这里使用ReactNative中的Module

<SignatureCapture
                onSaveEvent={this._onSaveEvent}
                saveImageFileInExtStorage={false}
                viewMode={"portrait"}/>

一切都很有效.但是我必须在反应方面发生一些点击事件时才保存图像.即,我必须从reactnative js代码调用SignatureCaptureMainView的saveImage()方法.

我怎样才能实现它？.请帮助

根据@agent_hunt给出的指针.

检查这个blog进行解释

我在SignatureCaptureViewManager中使用了ui manager命令.发布我的解决方案

public class SignatureCaptureViewManager extends ViewGroupManager<SignatureCaptureMainView> {
private Activity mCurrentActivity;

public static final String PROPS_SAVE_IMAGE_FILE="saveImageFileInExtStorage";
public static final String PROPS_VIEW_MODE = "viewMode";

public static final int COMMAND_SAVE_IMAGE = 1;


public SignatureCaptureViewManager(Activity activity) {
    mCurrentActivity = activity;
}

@Override
public String getName() {
    return "SignatureView";
}

@ReactProp(name = PROPS_SAVE_IMAGE_FILE)
public void setSaveImageFileInExtStorage(SignatureCaptureMainView view,@Nullable Boolean saveFile) {
    Log.d("React View manager setSaveFileInExtStorage:","" + saveFile);
    if(view!=null){
        view.setSaveFileInExtStorage(saveFile);
    }
}

@ReactProp(name = PROPS_VIEW_MODE)
public void setViewMode(SignatureCaptureMainView view,@Nullable String viewMode) {
    Log.d("React View manager setViewMode:","" + viewMode);
    if(view!=null){
        view.setViewMode(viewMode);
    }
}

@Override
public SignatureCaptureMainView createViewInstance(ThemedReactContext context) {
    Log.d("React"," View manager createViewInstance:");
    return new SignatureCaptureMainView(context,mCurrentActivity);
}

@Override
public Map<String,Integer> getCommandsMap() {
    Log.d("React"," View manager getCommandsMap:");
    return MapBuilder.of(
            "saveImage",COMMAND_SAVE_IMAGE);
}

@Override
public void receiveCommand(
        SignatureCaptureMainView view,int commandType,@Nullable ReadableArray args) {
    Assertions.assertNotNull(view);
    Assertions.assertNotNull(args);
    switch (commandType) {
        case COMMAND_SAVE_IMAGE: {
            view.saveImage();
            return;
        }

        default:
            throw new IllegalArgumentException(String.format(
                    "Unsupported command %d received by %s.",commandType,getClass().getSimpleName()));
    }
}


}

为了向ViewManager发送命令,我在Signature Capture组件中添加了此方法

class SignatureCapture extends React.Component {

constructor() {
super();
this.onChange = this.onChange.bind(this);
}

onChange(event) {
console.log("Signature  ON Change Event");
if (!this.props.onSaveEvent) {
  return;
}

this.props.onSaveEvent({
  pathName: event.nativeEvent.pathName,});
 }

 render() {
  return (
   <SignatureView {...this.props} style={{flex: 1}} onChange=      {this.onChange} />
);
  }

saveImage(){
 UIManager.dispatchViewManagerCommand(
        React.findNodeHandle(this),UIManager.SignatureView.Commands.saveImage,[],);
   }
 }

SignatureCapture.propTypes = {
...View.propTypes,rotateClockwise: PropTypes.bool,square:PropTypes.bool,viewMode:PropTypes.string
};

  var SignatureView = requireNativeComponent('SignatureView',{
 nativeOnly: {onChange: true}
 });

 module.exports = SignatureCapture;

这就是我在父Signature组件中使用SignatureCapture组件的方法

class Signature extends Component {

render() {

    return (
        <View style={{ flex: 1,flexDirection: "column" }}>

            <SignatureCapture
                style={{ flex: 8 }}
                ref="sign",onSaveEvent={this._onSaveEvent}
                saveImageFileInExtStorage={false}
                viewMode={"portrait"}/>

            <TouchableHighlight style={{ flex: 2 }}
                onPress={() => { this.saveSign() } } >
                <Text>Save</Text>
            </TouchableHighlight>

        </View>
    );
}
// Calls Save method of native view and triggers onSaveEvent callback
saveSign() {
    this.refs["sign"].saveImage();        
}

_onSaveEvent(result) {
    //result.encoded - for the base64 encoded png
    //result.pathName - for the file path name
    console.log(result);
  }

  }

 export default Signature;

（编辑：李大同）

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