如果你不想使用任何第三方库或任何随机解决方案，那么就使用谷歌库来检测它。

Android设备验证

回应:

{
  "timestampMs": 9860437986543,
  "nonce": "R2Rra24fVm5xa2Mg",
  "apkPackageName": "com.package.name.of.requesting.app",
  "apkCertificateDigestSha256": ["base64 encoded, SHA-256 hash of the
                                  certificate used to sign requesting app"],
  "ctsProfileMatch": true,
  "basicIntegrity": true,
}

ctsprofilmatch如果设备已根，则给出false。

参考链接: [1]: https://developer.android.com/training/safetynet/attestation

谷歌播放服务有安全网络认证API，通过它我们可以评估设备，并确定它是否被根/篡改。

请通过我的回答来处理根设备: https://stackoverflow.com/a/58304556/3908895

一些用于设置系统属性ro的修改版本。Modversion用于此目的。事情似乎已经发生了变化;我几个月前在TheDude上的构建是这样的:

cmb@apollo:~$ adb -d shell getprop |grep build
[ro.build.id]: [CUPCAKE]
[ro.build.display.id]: [htc_dream-eng 1.5 CUPCAKE eng.TheDudeAbides.20090427.235325 test-keys]
[ro.build.version.incremental]: [eng.TheDude.2009027.235325]
[ro.build.version.sdk]: [3]
[ro.build.version.release]: [1.5]
[ro.build.date]: [Mon Apr 20 01:42:32 CDT 2009]
[ro.build.date.utc]: [1240209752]
[ro.build.type]: [eng]
[ro.build.user]: [TheDude]
[ro.build.host]: [ender]
[ro.build.tags]: [test-keys]
[ro.build.product]: [dream]
[ro.build.description]: [kila-user 1.1 PLAT-RC33 126986 ota-rel-keys,release-keys]
[ro.build.fingerprint]: [tmobile/kila/dream/trout:1.1/PLAT-RC33/126986:user/ota-rel-keys,release-keys]
[ro.build.changelist]: [17615# end build properties]

另一方面，来自1.5 SDK的模拟器，运行1.5镜像，也有根，可能类似于Android Dev Phone 1(你可能想要允许)，并有这个:

cmb@apollo:~$ adb -e shell getprop |grep build
[ro.build.id]: [CUPCAKE]
[ro.build.display.id]: [sdk-eng 1.5 CUPCAKE 148875 test-keys]
[ro.build.version.incremental]: [148875]
[ro.build.version.sdk]: [3]
[ro.build.version.release]: [1.5]
[ro.build.date]: [Thu May 14 18:09:10 PDT 2009]
[ro.build.date.utc]: [1242349750]
[ro.build.type]: [eng]
[ro.build.user]: [android-build]
[ro.build.host]: [undroid16.mtv.corp.google.com]
[ro.build.tags]: [test-keys]
[ro.build.product]: [generic]
[ro.build.description]: [sdk-eng 1.5 CUPCAKE 148875 test-keys]
[ro.build.fingerprint]: [generic/sdk/generic/:1.5/CUPCAKE/148875:eng/test-keys]

至于零售构建，我手头没有，但在site:xda developers.com下的各种搜索提供了大量信息。这是荷兰的G1, ro。build。tags没有test-key，我认为这可能是最可靠的属性。

下面是一个类，它将以三种方式之一检查Root。

/** @author Kevin Kowalewski */
public class RootUtil {
    public static boolean isDeviceRooted() {
        return checkRootMethod1() || checkRootMethod2() || checkRootMethod3();
    }

    private static boolean checkRootMethod1() {
        String buildTags = android.os.Build.TAGS;
        return buildTags != null && buildTags.contains("test-keys");
    }

    private static boolean checkRootMethod2() {
        String[] paths = { "/system/app/Superuser.apk", "/sbin/su", "/system/bin/su", "/system/xbin/su", "/data/local/xbin/su", "/data/local/bin/su", "/system/sd/xbin/su",
                "/system/bin/failsafe/su", "/data/local/su", "/su/bin/su"};
        for (String path : paths) {
            if (new File(path).exists()) return true;
        }
        return false;
    }

    private static boolean checkRootMethod3() {
        Process process = null;
        try {
            process = Runtime.getRuntime().exec(new String[] { "/system/xbin/which", "su" });
            BufferedReader in = new BufferedReader(new InputStreamReader(process.getInputStream()));
            if (in.readLine() != null) return true;
            return false;
        } catch (Throwable t) {
            return false;
        } finally {
            if (process != null) process.destroy();
        }
    }
}

在rootbox中使用我的库非常简单。检查所需的代码如下:

    //Pass true to <Shell>.start(...) call to run as superuser
    Shell shell = null;
    try {
            shell = Shell.start(true);
    } catch (IOException exception) {
            exception.printStackTrace();
    }
    if (shell == null)
            // We failed to execute su binary
            return;
    if (shell.isRoot()) {
            // Verified running as uid 0 (root), can continue with commands
            ...
    } else
            throw Exception("Unable to gain root access. Make sure you pressed Allow/Grant in superuser prompt.");

Java级别的根检查不是一个安全的解决方案。如果您的应用程序在root设备上运行有安全问题，那么请使用此解决方案。

凯文的答案是有效的，除非手机也有像RootCloak这样的应用程序。这样的应用程序有一个对Java api的句柄，一旦手机是根的，他们模仿这些api来返回手机不是根的。

我已经写了一个原生级别的代码基于凯文的答案，它甚至与RootCloak !此外，它不会导致任何内存泄漏问题。

#include <string.h>
#include <jni.h>
#include <time.h>
#include <sys/stat.h>
#include <stdio.h>
#include "android_log.h"
#include <errno.h>
#include <unistd.h>
#include <sys/system_properties.h>

JNIEXPORT int JNICALL Java_com_test_RootUtils_checkRootAccessMethod1(
        JNIEnv* env, jobject thiz) {


    //Access function checks whether a particular file can be accessed
    int result = access("/system/app/Superuser.apk",F_OK);

    ANDROID_LOGV( "File Access Result %d\n", result);

    int len;
    char build_tags[PROP_VALUE_MAX]; // PROP_VALUE_MAX from <sys/system_properties.h>.
    len = __system_property_get(ANDROID_OS_BUILD_TAGS, build_tags); // On return, len will equal (int)strlen(model_id).
    if(strcmp(build_tags,"test-keys") == 0){
        ANDROID_LOGV( "Device has test keys\n", build_tags);
        result = 0;
    }
    ANDROID_LOGV( "File Access Result %s\n", build_tags);
    return result;

}

JNIEXPORT int JNICALL Java_com_test_RootUtils_checkRootAccessMethod2(
        JNIEnv* env, jobject thiz) {
    //which command is enabled only after Busy box is installed on a rooted device
    //Outpput of which command is the path to su file. On a non rooted device , we will get a null/ empty path
    //char* cmd = const_cast<char *>"which su";
    FILE* pipe = popen("which su", "r");
    if (!pipe) return -1;
    char buffer[128];
    std::string resultCmd = "";
    while(!feof(pipe)) {
        if(fgets(buffer, 128, pipe) != NULL)
            resultCmd += buffer;
    }
    pclose(pipe);

    const char *cstr = resultCmd.c_str();
    int result = -1;
    if(cstr == NULL || (strlen(cstr) == 0)){
        ANDROID_LOGV( "Result of Which command is Null");
    }else{
        result = 0;
        ANDROID_LOGV( "Result of Which command %s\n", cstr);
        }
    return result;

}

JNIEXPORT int JNICALL Java_com_test_RootUtils_checkRootAccessMethod3(
        JNIEnv* env, jobject thiz) {


    int len;
    char build_tags[PROP_VALUE_MAX]; // PROP_VALUE_MAX from <sys/system_properties.h>.
    int result = -1;
    len = __system_property_get(ANDROID_OS_BUILD_TAGS, build_tags); // On return, len will equal (int)strlen(model_id).
    if(len >0 && strstr(build_tags,"test-keys") != NULL){
        ANDROID_LOGV( "Device has test keys\n", build_tags);
        result = 0;
    }

    return result;

}

在Java代码中，需要创建包装器类RootUtils来进行本机调用

    public boolean checkRooted() {

       if( rootUtils.checkRootAccessMethod3()  == 0 || rootUtils.checkRootAccessMethod1()  == 0 || rootUtils.checkRootAccessMethod2()  == 0 )
           return true;
      return false;
     }