software copyright
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jiahong
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/*
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* 自然写互动课堂应用开发SDK软件 V1.0
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* WritechSDK - SDK初始化与鉴权入口
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*
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* 功能说明：
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* 1. SDK全局初始化（配置加载、模块注册）
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* 2. 应用鉴权（AppKey/AppSecret验证）
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* 3. 各子模块生命周期管理
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* 4. 全局配置管理（服务器地址、超时、日志级别）
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* 5. SDK版本信息与功能授权查询
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*/
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package com.writech.sdk.android;
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import android.content.Context;
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import android.content.SharedPreferences;
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import android.util.Log;
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import java.io.IOException;
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import java.util.concurrent.atomic.AtomicBoolean;
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/**
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* 自然写SDK主入口类
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* 使用前必须先调用 init() 方法进行初始化和鉴权
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*
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* 典型使用流程：
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* 1. WritechSDK.init(context, config)
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* 2. WritechSDK.getInstance().getPenManager().startScan()
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* 3. WritechSDK.getInstance().getOCREngine().recognizeHandwriting(...)
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*/
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public class WritechSDK {
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private static final String TAG = "WritechSDK";
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/* SDK版本号 */
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public static final String SDK_VERSION = "1.0.0";
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/* SDK构建号 */
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public static final int SDK_BUILD = 100;
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/* 单例实例 */
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private static volatile WritechSDK sInstance;
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/* 是否已初始化 */
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private static final AtomicBoolean sInitialized = new AtomicBoolean(false);
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/* ========== 配置类 ========== */
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/** SDK初始化配置 */
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public static class Config {
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/** 云平台API地址 */
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public String cloudBaseUrl = "https://api.writech.com";
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/** SDK应用标识（从自然写开放平台获取） */
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public String appKey;
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/** SDK应用密钥 */
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public String appSecret;
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/** 离线OCR模型文件路径（可选） */
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public String offlineModelPath;
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/** 是否启用调试日志 */
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public boolean debugMode = false;
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/** 笔迹数据本地缓存目录 */
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public String cacheDir;
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/** BLE扫描超时时间（毫秒） */
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public int bleScanTimeout = 30000;
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/** 网关自动发现 */
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public boolean autoDiscoverGateway = true;
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/** 最大同时连接笔数 */
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public int maxPenConnections = 60;
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}
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/* ========== 成员变量 ========== */
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private Context mContext;
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private Config mConfig;
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/* 各子模块实例 */
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private PenManager mPenManager;
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private StrokeCanvas mDefaultCanvas;
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private OCREngine mOCREngine;
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private GatewaySDK mGatewaySDK;
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private CloudClient mCloudClient;
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/* 鉴权状态 */
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private boolean mIsAuthenticated = false;
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private String mLicenseType; /* 授权类型: trial/standard/enterprise */
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private long mLicenseExpireTime; /* 授权到期时间 */
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/* 本地存储 */
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private SharedPreferences mPrefs;
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/* ========== 初始化入口 ========== */
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/**
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* 初始化SDK（必须在使用任何功能前调用）
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*
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* @param context Android上下文（Application级别）
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* @param config SDK配置
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* @return 初始化结果：true成功，false失败
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*/
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public static boolean init(Context context, Config config) {
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if (sInitialized.getAndSet(true)) {
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Log.w(TAG, "SDK已初始化，忽略重复调用");
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return true;
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}
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if (context == null || config == null) {
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Log.e(TAG, "初始化失败：context或config为null");
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sInitialized.set(false);
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return false;
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}
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if (config.appKey == null || config.appSecret == null) {
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Log.e(TAG, "初始化失败：appKey或appSecret未配置");
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sInitialized.set(false);
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return false;
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}
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sInstance = new WritechSDK();
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boolean success = sInstance.doInit(context, config);
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if (!success) {
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sInstance = null;
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sInitialized.set(false);
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}
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return success;
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}
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/** 获取SDK单例 */
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public static WritechSDK getInstance() {
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if (sInstance == null) {
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throw new IllegalStateException("WritechSDK未初始化，请先调用 WritechSDK.init()");
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}
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return sInstance;
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}
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/** 检查SDK是否已初始化 */
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public static boolean isInitialized() {
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return sInitialized.get();
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}
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/* ========== 内部初始化流程 ========== */
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/** 执行具体的初始化逻辑 */
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private boolean doInit(Context context, Config config) {
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mContext = context.getApplicationContext();
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mConfig = config;
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mPrefs = mContext.getSharedPreferences("writech_sdk", Context.MODE_PRIVATE);
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Log.i(TAG, "=== 自然写SDK V" + SDK_VERSION + " 初始化开始 ===");
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Log.i(TAG, "云平台地址: " + config.cloudBaseUrl);
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Log.i(TAG, "AppKey: " + config.appKey.substring(0, 8) + "****");
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Log.i(TAG, "调试模式: " + config.debugMode);
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/* 步骤1：应用鉴权（验证AppKey和AppSecret） */
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if (!authenticate(config.appKey, config.appSecret)) {
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Log.e(TAG, "SDK鉴权失败，请检查AppKey和AppSecret");
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return false;
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}
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/* 步骤2：初始化云平台客户端 */
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mCloudClient = new CloudClient(config.cloudBaseUrl, config.appKey, config.appSecret);
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/* 恢复本地缓存的令牌 */
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restoreTokens();
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/* 步骤3：初始化蓝牙笔管理器 */
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mPenManager = new PenManager(mContext);
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/* 步骤4：初始化OCR引擎 */
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mOCREngine = new OCREngine(mContext, config.cloudBaseUrl, null);
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if (config.offlineModelPath != null) {
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mOCREngine.loadOfflineModel(config.offlineModelPath);
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}
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/* 步骤5：初始化网关SDK */
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mGatewaySDK = new GatewaySDK(mContext);
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if (config.autoDiscoverGateway) {
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mGatewaySDK.startDiscovery();
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}
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Log.i(TAG, "=== 自然写SDK初始化完成 ===");
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return true;
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}
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/* ========== 应用鉴权 ========== */
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/**
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* 验证AppKey和AppSecret的有效性
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* 首次验证需要联网，之后缓存鉴权结果
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*/
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private boolean authenticate(String appKey, String appSecret) {
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/* 检查本地缓存的鉴权结果 */
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String cachedLicense = mPrefs.getString("license_type", null);
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long cachedExpire = mPrefs.getLong("license_expire", 0);
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if (cachedLicense != null && cachedExpire > System.currentTimeMillis()) {
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mIsAuthenticated = true;
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mLicenseType = cachedLicense;
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mLicenseExpireTime = cachedExpire;
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Log.i(TAG, "使用缓存鉴权结果: " + mLicenseType
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+ "，到期: " + new java.util.Date(mLicenseExpireTime));
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return true;
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}
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/* 在线鉴权 */
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try {
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String authUrl = mConfig.cloudBaseUrl + "/api/v1/sdk/authenticate";
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String body = "{\"appKey\":\"" + appKey
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+ "\",\"appSecret\":\"" + appSecret
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+ "\",\"sdkVersion\":\"" + SDK_VERSION + "\"}";
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/* 使用CloudClient的静态方法发送无认证请求 */
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java.net.HttpURLConnection conn =
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(java.net.HttpURLConnection) new java.net.URL(authUrl).openConnection();
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conn.setRequestMethod("POST");
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conn.setRequestProperty("Content-Type", "application/json");
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conn.setDoOutput(true);
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conn.setConnectTimeout(10000);
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conn.getOutputStream().write(body.getBytes(java.nio.charset.StandardCharsets.UTF_8));
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int responseCode = conn.getResponseCode();
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if (responseCode == 200) {
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java.io.InputStream is = conn.getInputStream();
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java.io.ByteArrayOutputStream baos = new java.io.ByteArrayOutputStream();
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byte[] buf = new byte[1024];
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int len;
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while ((len = is.read(buf)) != -1) {
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baos.write(buf, 0, len);
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}
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String response = baos.toString("UTF-8");
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is.close();
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conn.disconnect();
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/* 解析鉴权结果 */
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mLicenseType = extractJsonField(response, "licenseType");
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String expireStr = extractJsonField(response, "expireTime");
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if (mLicenseType != null) {
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mLicenseExpireTime = expireStr != null ? Long.parseLong(expireStr)
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: System.currentTimeMillis() + 365L * 24 * 3600 * 1000;
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mIsAuthenticated = true;
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/* 缓存鉴权结果 */
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mPrefs.edit()
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.putString("license_type", mLicenseType)
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.putLong("license_expire", mLicenseExpireTime)
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.apply();
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Log.i(TAG, "在线鉴权成功: " + mLicenseType);
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return true;
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}
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}
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conn.disconnect();
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} catch (Exception e) {
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Log.w(TAG, "在线鉴权异常: " + e.getMessage());
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/* 联网失败时允许离线试用（7天） */
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mLicenseType = "trial";
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mLicenseExpireTime = System.currentTimeMillis() + 7L * 24 * 3600 * 1000;
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mIsAuthenticated = true;
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Log.i(TAG, "离线模式，试用授权7天");
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return true;
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}
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return false;
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}
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/** 恢复本地缓存的认证令牌 */
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private void restoreTokens() {
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String accessToken = mPrefs.getString("access_token", null);
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String refreshToken = mPrefs.getString("refresh_token", null);
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long expireTime = mPrefs.getLong("token_expire", 0);
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if (accessToken != null && refreshToken != null) {
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mCloudClient.setTokens(accessToken, refreshToken, expireTime);
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Log.d(TAG, "已恢复缓存的认证令牌");
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}
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}
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/* ========== 对外接口 ========== */
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/** 获取笔管理器 */
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public PenManager getPenManager() {
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return mPenManager;
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}
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/** 获取OCR引擎 */
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public OCREngine getOCREngine() {
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return mOCREngine;
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}
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/** 获取网关SDK */
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public GatewaySDK getGatewaySDK() {
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return mGatewaySDK;
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}
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/** 获取云平台客户端 */
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public CloudClient getCloudClient() {
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return mCloudClient;
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}
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/** 获取SDK版本 */
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public String getVersion() {
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return SDK_VERSION;
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}
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/** 获取授权类型 */
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public String getLicenseType() {
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return mLicenseType;
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}
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/** 检查是否已鉴权 */
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public boolean isAuthenticated() {
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return mIsAuthenticated;
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}
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/** 用户登录（通过云平台认证） */
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public boolean loginUser(String username, String password) {
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try {
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String response = mCloudClient.login(username, password);
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String accessToken = extractJsonField(response, "accessToken");
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String refreshToken = extractJsonField(response, "refreshToken");
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if (accessToken != null) {
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long expireTime = System.currentTimeMillis() + 30 * 60 * 1000;
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mCloudClient.setTokens(accessToken, refreshToken, expireTime);
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/* 缓存令牌 */
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mPrefs.edit()
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.putString("access_token", accessToken)
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.putString("refresh_token", refreshToken)
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.putLong("token_expire", expireTime)
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.apply();
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return true;
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}
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} catch (IOException e) {
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Log.e(TAG, "登录失败: " + e.getMessage());
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}
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return false;
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}
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/* ========== 资源释放 ========== */
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/** 释放SDK所有资源 */
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public static void destroy() {
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if (sInstance != null) {
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if (sInstance.mGatewaySDK != null) sInstance.mGatewaySDK.destroy();
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if (sInstance.mOCREngine != null) sInstance.mOCREngine.destroy();
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if (sInstance.mPenManager != null) sInstance.mPenManager.destroy();
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sInstance = null;
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}
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sInitialized.set(false);
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Log.i(TAG, "WritechSDK已释放所有资源");
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}
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/** 从JSON提取字段值 */
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private String extractJsonField(String json, String key) {
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if (json == null) return null;
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String search = "\"" + key + "\"";
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int idx = json.indexOf(search);
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if (idx < 0) return null;
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int start = json.indexOf("\"", idx + search.length() + 1) + 1;
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int end = json.indexOf("\"", start);
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return (start > 0 && end > start) ? json.substring(start, end) : null;
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}
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}
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