Android NDK几点回调方式

来源：互联网发布：吉林农业大学网络课编辑：程序博客网时间：2024/05/14 23:17

原文dellinger：http://www.cnblogs.com/dellinger/p/3454996.html

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：

intget_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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