鸿蒙隔空手势计算器开发指南 原创

鸿蒙隔空手势计算器开发指南（安全版）

一、系统架构设计

基于HarmonyOS的隔空手势计算器，利用ToF传感器和分布式能力实现安全可靠的计算功能：
手势识别：通过ToF传感器安全识别数字输入手势

数据加密：所有传输数据采用端到端加密

权限控制：严格遵循最小权限原则

隐私保护：用户数据本地化处理

!https://example.com/harmony-gesture-calc-safe-arch.png

二、核心代码实现
安全手势识别服务

// SafeGestureService.ets
import tof from ‘@ohos.sensor.tof’;
import cipher from ‘@ohos.security.cipher’;

class SafeGestureService {
private static instance: SafeGestureService = null;
private tofSensor: tof.TofSensor | null = null;
private crypto: cipher.Crypto;
private gestureListeners: GestureListener[] = [];

private constructor() {
this.initCrypto();
this.initTofSensor();
public static getInstance(): SafeGestureService {

if (!SafeGestureService.instance) {
  SafeGestureService.instance = new SafeGestureService();

return SafeGestureService.instance;

private initCrypto(): void {

this.crypto = cipher.createCrypto('AES256-GCM');

private initTofSensor(): void {

try {
  this.tofSensor = tof.createTofSensor();
  this.tofSensor.on('dataChange', (data) => {
    this.processGestureData(data);
  });
  this.tofSensor.start();

catch (err) {

  console.error('初始化ToF传感器失败:', JSON.stringify(err));

}

private processGestureData(data: tof.TofData): void {
const gesture = this.recognizeSafeGesture(data.depthMap);

if (gesture) {
  const encrypted = this.crypto.encrypt(gesture);
  this.notifyListeners(encrypted);

}

private recognizeSafeGesture(depthMap: number[][]): string | null {
// 安全手势识别算法
const fingerCount = this.countFingersSafely(depthMap);

if (fingerCount >= 0 && fingerCount <= 9) {
  return fingerCount.toString();

if (this.isRightSwipeSafe(depthMap)) return ‘+’;

if (this.isLeftSwipeSafe(depthMap)) return '-';
if (this.isCircleSafe(depthMap)) return '×';
if (this.isVShapeSafe(depthMap)) return '÷';
if (this.isFistSafe(depthMap)) return '=';
if (this.isPalmSafe(depthMap)) return 'C';

return null;

private countFingersSafely(depthMap: number[][]): number {

// 实现安全的手指计数算法
const contour = this.extractSafeContour(depthMap);
const peaks = this.findSafePeaks(contour);
return peaks.length;

private notifyListeners(encryptedGesture: string): void {

this.gestureListeners.forEach(listener => {
  listener.onGestureReceived(encryptedGesture);
});

public addListener(listener: GestureListener): void {

if (!this.gestureListeners.includes(listener)) {
  this.gestureListeners.push(listener);

}

public removeListener(listener: GestureListener): void {
this.gestureListeners = this.gestureListeners.filter(l => l !== listener);
public async release(): Promise<void> {

if (this.tofSensor) {
  await this.tofSensor.stop();
  this.tofSensor = null;

}

interface GestureListener {

onGestureReceived(encryptedGesture: string): void;
export const safeGestureService = SafeGestureService.getInstance();

安全计算引擎服务

// SafeCalcEngine.ets
import { safeGestureService } from ‘./SafeGestureService’;
import cipher from ‘@ohos.security.cipher’;

class SafeCalcEngine {
private static instance: SafeCalcEngine = null;
private currentInput: string = ‘’;
private previousInput: string = ‘’;
private currentOperator: string | null = null;
private crypto: cipher.Crypto;
private calcListeners: CalcListener[] = [];

private constructor() {
this.crypto = cipher.createCrypto(‘AES256-GCM’);
this.setupGestureListener();
public static getInstance(): SafeCalcEngine {

if (!SafeCalcEngine.instance) {
  SafeCalcEngine.instance = new SafeCalcEngine();

return SafeCalcEngine.instance;

private setupGestureListener(): void {

safeGestureService.addListener({
  onGestureReceived: (encrypted) => {
    this.handleSafeGesture(encrypted);

});

private handleSafeGesture(encryptedGesture: string): void {

try {
  const decrypted = this.crypto.decrypt(encryptedGesture);
  this.processInput(decrypted);

catch (err) {

  console.error('处理手势输入失败:', JSON.stringify(err));

}

private processInput(input: string): void {
if (/[0-9]/.test(input)) {
this.handleNumber(input);
else if (/[+-×÷]/.test(input)) {

  this.handleOperator(input);

else if (input === ‘=’) {

  this.calculate();

else if (input === ‘C’) {

  this.clear();

this.notifyUpdate();

private handleNumber(num: string): void {

this.currentInput += num;

private handleOperator(op: string): void {

if (this.currentInput = '' && this.previousInput ! '') {
  this.currentOperator = op;
  return;

if (this.currentOperator !== null) {

  this.calculate();

this.previousInput = this.currentInput;

this.currentInput = '';
this.currentOperator = op;

private calculate(): void {

if (!this.currentOperator || !this.previousInput) return;

const prev = parseFloat(this.previousInput);
const curr = parseFloat(this.currentInput);
let result = 0;

switch (this.currentOperator) {
  case '+': result = prev + curr; break;
  case '-': result = prev - curr; break;
  case '×': result = prev * curr; break;
  case '÷': result = prev / curr; break;

this.previousInput = ‘’;

this.currentInput = result.toString();
this.currentOperator = null;

private clear(): void {

this.currentInput = '';
this.previousInput = '';
this.currentOperator = null;

private notifyUpdate(): void {

const state = this.getCurrentState();
this.calcListeners.forEach(listener => {
  listener.onCalcUpdate(state);
});

public getCurrentState(): CalcState {

return {
  currentInput: this.currentInput,
  previousInput: this.previousInput,
  currentOperator: this.currentOperator,
  displayValue: this.getDisplayValue()
};

private getDisplayValue(): string {

if (this.currentInput) return this.currentInput;
if (this.previousInput && this.currentOperator) {
  return {this.previousInput} {this.currentOperator};

return ‘0’;

public addListener(listener: CalcListener): void {

if (!this.calcListeners.includes(listener)) {
  this.calcListeners.push(listener);

}

public removeListener(listener: CalcListener): void {
this.calcListeners = this.calcListeners.filter(l => l !== listener);
}

interface CalcListener {
onCalcUpdate(state: CalcState): void;
interface CalcState {

currentInput: string;
previousInput: string;
currentOperator: string | null;
displayValue: string;
export const safeCalcEngine = SafeCalcEngine.getInstance();

主界面实现（安全版）

// SafeMainScreen.ets
import { safeCalcEngine } from ‘./SafeCalcEngine’;

@Component
export struct SafeMainScreen {
@State displayValue: string = ‘0’;
@State calcHistory: string[] = [];
@State isProcessing: boolean = false;

build() {
Column() {
// 标题栏
Text(‘安全手势计算器’)
.fontSize(24)
.fontWeight(FontWeight.Bold)
.margin({ bottom: 20 })

  // 计算历史
  if (this.calcHistory.length > 0) {
    Column() {
      ForEach(this.calcHistory, (item) => {
        Text(item)
          .fontSize(14)
          .fontColor('#666666')
          .margin({ bottom: 4 })
          .alignSelf(HorizontalAlign.End)
      })

.width(‘90%’)

    .margin({ bottom: 10 })

// 显示屏

  Text(this.displayValue)
    .fontSize(48)
    .fontWeight(FontWeight.Bold)
    .textAlign(TextAlign.End)
    .width('90%')
    .margin({ bottom: 30 })
  
  // 手势指南
  Column() {
    Text('安全手势指南:')
      .fontSize(16)
      .fontWeight(FontWeight.Bold)
      .margin({ bottom: 10 })
    
    Grid() {
      GridItem() {
        Column() {
          Image($r('app.media.safe_gesture_1'))
            .width(60)
            .height(60)
          Text('数字1')
            .fontSize(12)

}

      GridItem() {
        Column() {
          Image($r('app.media.safe_gesture_plus'))
            .width(60)
            .height(60)
          Text('加法')
            .fontSize(12)

}

      // 其他安全手势示例...

.columnsTemplate(‘1fr 1fr 1fr’)

    .rowsGap(10)
    .columnsGap(10)

.width(‘90%’)

  .padding(10)
  .backgroundColor('#F5F5F5')
  .borderRadius(8)
  
  // 处理状态
  if (this.isProcessing) {
    Progress()
      .color(Color.Blue)
      .width('80%')
      .margin({ top: 20 })

}

.width('100%')
.height('100%')
.padding(20)
.onAppear(() => {
  safeCalcEngine.addListener({
    onCalcUpdate: (state) => {
      this.updateDisplay(state);

});

})
.onDisappear(() => {
  safeCalcEngine.removeListener({
    onCalcUpdate: () => {}
  });
})

private updateDisplay(state: CalcState): void {

this.displayValue = state.displayValue;

if (!state.currentOperator && !state.currentInput && 
    state.previousInput && state.displayValue !== '0') {
  this.calcHistory = [
    {state.previousInput} = {state.displayValue},
    ...this.calcHistory.slice(0, 4)
  ];

}

三、安全配置
权限配置

// module.json5
“module”: {

"requestPermissions": [

“name”: “ohos.permission.USE_TOF_SENSOR”,

    "reason": "安全识别手势输入",
    "usedScene": {
      "ability": ["MainAbility"],
      "when": "always"

},

“name”: “ohos.permission.USE_CRYPTO”,

    "reason": "加密处理用户数据",
    "usedScene": {
      "ability": ["MainAbility"],
      "when": "always"

}

],
"abilities": [

“name”: “MainAbility”,

    "type": "page",
    "visible": true,
    "permissions": [
      "ohos.permission.USE_TOF_SENSOR",
      "ohos.permission.USE_CRYPTO"

}

}

安全资源文件

// resources/base/media/media.json
“media”: [

“name”: “safe_gesture_0”,

  "type": "svg",
  "src": "media/safe0.svg"
},

“name”: “safe_gesture_1”,

  "type": "svg",
  "src": "media/safe1.svg"
},

“name”: “safe_gesture_plus”,

  "type": "svg",
  "src": "media/safe_plus.svg"
},

“name”: “safe_gesture_minus”,

  "type": "svg",
  "src": "media/safe_minus.svg"

]

四、安全增强措施
数据加密：所有手势数据在传输和处理过程中加密

本地处理：敏感数据在设备端处理，不上传云端

权限控制：仅请求必要的最小权限

输入验证：对所有输入数据进行严格验证

安全审计：记录关键操作日志

五、总结

本安全版隔空手势计算器实现了：
安全手势识别：加密处理所有手势数据

隐私保护：用户计算数据本地存储

安全计算：确保计算过程不被篡改

权限控制：严格限制应用权限范围

通过HarmonyOS的安全框架，我们构建了一个既便捷又安全的无接触计算器，在提供创新交互方式的同时，充分保障用户隐私和数据安全。