Android(安卓)NDK几点回调方式（device id & signature）
16lz
2021-01-25
一、NDK中获取android设备ID的方式
Java代码如下（获取设备ANDROID_ID）：
final String androidId = Secure.getString(context.getContentResolver(), Secure.ANDROID_ID); 对应的c代码（相当蛋疼），注意如果是C++，需要把所有的(*env)->替换成env->，同时去掉第一个参数env
char *get_android_id(JNIEnv *env, jobject mContext, jobject actObj){ char *szDevId = NULL; if (!mContext) { return szDevId; } jclass resCls = (*env)->FindClass(env, "android/content/Context"); jmethodID getMethod = (*env)->GetMethodID(env, resCls, "getContentResolver", "()Landroid/content/ContentResolver;"); jobject resolver = (*env)->CallObjectMethod(env, actObj, getMethod); if (resolver == NULL) { LOGE("Invalid resolver!"); } jclass cls_context = (*env)->FindClass(env, "android/provider/Settings$Secure"); if (cls_context == NULL) { LOGE("Invalid cls_context!"); } jmethodID getStringMethod = (*env)->GetStaticMethodID(env, cls_context, "getString", "(Landroid/content/ContentResolver;Ljava/lang/String;)Ljava/lang/String;"); if (getStringMethod == NULL) { LOGE("Invalid getStringMethod!"); } jfieldID ANDROID_ID = (*env)->GetStaticFieldID(env, cls_context, "ANDROID_ID", "Ljava/lang/String;"); jstring str = (jstring)((*env)->GetStaticObjectField(env, cls_context, ANDROID_ID)); jstring jId = (jstring)((*env)->CallStaticObjectMethod(env, cls_context, getStringMethod, resolver, str)); szDevId = (char *)((*env)->GetStringUTFChars(env, jId, 0)); return szDevId;}
如果是手机，还可以通过TelephoneManager.getDeviceId()方式来获取：
Java代码：
final String deviceId = ((TelephonyManager) context.getSystemService( Context.TELEPHONY_SERVICE )).getDeviceId(); 对应的C代码：
char * get_telepone_id(JNIEnv *env, jobject mContext, jobject actObj) { char *szDevId = NULL; if(mContext == 0){ return szDevId; } jclass cls_context = (*env)->FindClass(env, "android/content/Context"); jmethodID getSystemService = (*env)->GetMethodID(env, cls_context, "getSystemService", "(Ljava/lang/String;)Ljava/lang/Object;"); if(!getSystemService){ return szDevId; } jfieldID TELEPHONY_SERVICE = (*env)->GetStaticFieldID(env, cls_context, "TELEPHONY_SERVICE", "Ljava/lang/String;"); if(!TELEPHONY_SERVICE){ return szDevId; } jstring str = (jstring)(*env)->GetStaticObjectField(env, cls_context, TELEPHONY_SERVICE); jclass cls_tm = (*env)->FindClass(env, "android/telephony/TelephonyManager"); if(!cls_tm){ return szDevId; } jobject telephonymanager = (*env)->CallObjectMethod(env, actObj, getSystemService, str); if(!telephonymanager){ return szDevId; } jmethodID getDeviceId = (*env)->GetMethodID(env, cls_tm, "getDeviceId", "()Ljava/lang/String;"); if(!getDeviceId){ return szDevId; } jstring deviceid = (jstring)(*env)->CallObjectMethod(env, telephonymanager, getDeviceId); szDevId = (char *)(*env)->GetStringUTFChars(env, deviceid, 0); (*env)->DeleteLocalRef(env, cls_tm); (*env)->DeleteLocalRef(env, cls_context); (*env)->DeleteLocalRef(env, telephonymanager); return szDevId;}
二、通过NDK获取证书签名
Java代码：
PackageInfo pis;try { pis = mContext.getPackageManager().getPackageInfo(packageName, PackageManager.GET_SIGNATURES); //获取包信息 Signature sigs = pis.signatures[0]; //获取签名 int hash = sigs.hashCode(); //获取签名的哈希码} catch(Exception e) { //TODO:log here.}
对应的C代码：
int get_apk_signature(JNIEnv *env, jobject obj) { jclass cls = (*env)->FindClass(env, "android/content/ContextWrapper"); //this.getPackageManager(); jmethodID mid = (*env)->GetMethodID(env, cls, "getPackageManager", "()Landroid/content/pm/PackageManager;"); if (mid == NULL) { return -1; } jobject pm = (*env)->CallObjectMethod(env, obj, mid); if (pm == NULL) { return -2; } //this.getPackageName(); mid = (*env)->GetMethodID(env, cls, "getPackageName", "()Ljava/lang/String;"); if (mid == NULL) { return -3; } jstring packageName = (jstring)(*env)->CallObjectMethod(env, obj, mid); // packageManager->getPackageInfo(packageName, GET_SIGNATURES); cls = (*env)->GetObjectClass(env, pm); mid = (*env)->GetMethodID(env, cls, "getPackageInfo", "(Ljava/lang/String;I)Landroid/content/pm/PackageInfo;"); jobject packageInfo = (*env)->CallObjectMethod(env, pm, mid, packageName, 0x40); //GET_SIGNATURES = 64; cls = (*env)->GetObjectClass(env, packageInfo); jfieldID fid = (*env)->GetFieldID(env, cls, "signatures", "[Landroid/content/pm/Signature;"); jobjectArray signatures = (jobjectArray)(*env)->GetObjectField(env, packageInfo, fid); jobject sig = (*env)->GetObjectArrayElement(env, signatures, 0); cls = (*env)->GetObjectClass(env, sig); mid = (*env)->GetMethodID(env, cls, "hashCode", "()I"); int sig_value = (int)(*env)->CallIntMethod(env, sig, mid); return sig_value;}
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