问题描述
我创建了一个CustomView SignatureView.java,它扩展了LinearLayout以便在Android Native中捕获签名.
I have created a CustomView SignatureView.java which extends LinearLayout for capturing signature in Android Native.
并创建了SignatureCapturePackage.java和SignatureCaptureViewManager.java
And created SignatureCapturePackage.java and SignatureCaptureViewManager.java
public class SignatureCaptureMainView extends LinearLayout {
....
public void saveImage(){
//Save image to file
}
}
这是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
this is the ViewManager class
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捆绑包
This is Signature.js bundle
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;
我正在像这样在ReactNative中使用模块
I am using the Module in ReactNative like this
<SignatureCapture
onSaveEvent={this._onSaveEvent}
saveImageFileInExtStorage={false}
viewMode={"portrait"}/>
一切正常.但是我只需要在反应侧发生一些单击事件时才保存图像.即,我必须从反应式js代码中调用SignatureCaptureMainView的saveImage()方法.
Everything worksFine. But i have to save the image only when some click event occurs in the react side. ie, i have to call SignatureCaptureMainView's saveImage() method from reactnative js code.
我该如何实现?请帮助
推荐答案
按照@agent_hunt给定的指针.
As per the pointer given by @agent_hunt.
检查此博客进行解释
我在SignatureCaptureViewManager中使用了ui管理器命令.发布我的解决方案
I have used ui manager commands in SignatureCaptureViewManager. Posting my solutions
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,我已经在Signature Capture组件中添加了此方法
For sending commands to ViewManager i have added this method in Signature Capture component
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} />
);
}
saveImage(){
UIManager.dispatchViewManagerCommand(
React.findNodeHandle(this),
UIManager.SignatureView.Commands.saveImage,
[],
);
}
}
SignatureCapture.propTypes = {
...View.propTypes,
rotateClockwise: PropTypes.bool,
square:PropTypes.bool,
saveImageFileInExtStorage: PropTypes.bool,
viewMode:PropTypes.string
};
var SignatureView = requireNativeComponent('SignatureView', SignatureCapture, {
nativeOnly: {onChange: true}
});
module.exports = SignatureCapture;
这就是我在父级Signature组件中使用SignatureCapture组件的方式
This is how i am using SignatureCapture component in my parent Signature component
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;
这篇关于从React Native Js代码调用Android Native UI组件方法的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!