反编译apk，将dex转为jar，修改.class，再将jar转为dex,打包回apk,jarsigner签名（验证，显示有签名信息），经过这些过程后，新的apk始终安装失败，为何？直接复制apk到/data/app里，启动时报类未找到异常。求解！
不知道是为什么jarsigner签名无效~~~使用aignapk签名后成功了。
如果系统里面已经安装没有改过的apk, 现在反编译了，并签名，如果签名和以前的不一样的话，与原版apk会冲突。这要就要卸载原版的apk，试试是否能行。
/**
- if the package is already installed.
- 程序已经存在 */ public static final int INSTALL_FAILED_ALREADY_EXISTS = -1;
/**
- if the package archive file is invalid.
- 无效的APK */ public static final int INSTALL_FAILED_INVALID_APK = -2;
/**
- if the URI passed in is invalid.
- 无效的链接 */ public static final int INSTALL_FAILED_INVALID_URI = -3;
/**
- if the package manager service found that the device
- didn't have enough storage space to install the app.
- 没有足够的存储空间 */ public static final int INSTALL_FAILED_INSUFFICIENT_STORAGE = -4;
/**
- if a package is already installed with the same name.
- 已存在同名程序 */ public static final int INSTALL_FAILED_DUPLICATE_PACKAGE = -5;
/**
- if the requested shared user does not exist.
- 共享用户不存在 */ public static final int INSTALL_FAILED_NO_SHARED_USER = -6;
/**
- if a previously installed package of the same name has a different signature
- than the new package (and the old package's data was not removed).
- 更新不兼容 */ public static final int INSTALL_FAILED_UPDATE_INCOMPATIBLE = -7;
/**
- if the new package is requested a shared user which is already installed
- on the device and does not have matching signature.
- 共享用户不兼容 */ public static final int INSTALL_FAILED_SHARED_USER_INCOMPATIBLE = -8;
/**
- if the new package uses a shared library that is not available.
- 共享库已丢失 */ public static final int INSTALL_FAILED_MISSING_SHARED_LIBRARY = -9;
/**
- if the new package uses a shared library that is not available.
- 替换时无法删除 */ public static final int INSTALL_FAILED_REPLACE_COULDNT_DELETE = -10;
/**
- if the new package failed while optimizing and validating its dex files,
- either because there was not enough storage or the validation failed.
- 空间不足或验证失败 */ public static final int INSTALL_FAILED_DEXOPT = -11;
/**
- if the new package failed because the current SDK version is older than
- that required by the package.
- 系统版本过旧 */ public static final int INSTALL_FAILED_OLDER_SDK = -12;
/**
- if the new package failed because it contains a content provider with the
- same authority as a provider already installed in the system.
- 存在同名的内容提供者 */ public static final int INSTALL_FAILED_CONFLICTING_PROVIDER = -13;
/**
- if the new package failed because the current SDK version is newer than
- that required by the package.
- 系统版本过新 */ public static final int INSTALL_FAILED_NEWER_SDK = -14;
/**
- if the new package failed because it has specified that it is a test-only
- package and the caller has not supplied the {@link #INSTALL_ALLOW_TEST}
- flag.
- 调用者不被允许测试的测试程序 */ public static final int INSTALL_FAILED_TEST_ONLY = -15;
/**
- if the package being installed contains native code, but none that is
- compatible with the the device's CPU_ABI.
- 包含的本机代码不兼容CPU_ABI */ public static final int INSTALL_FAILED_CPU_ABI_INCOMPATIBLE = -16;
/**
- if the new package uses a feature that is not available.
- 使用了一个无效的特性 */ public static final int INSTALL_FAILED_MISSING_FEATURE = -17;
// ------ Errors related to sdcard
/**
- if a secure container mount point couldn't be accessed on external media.
- SD卡访问失败 */ public static final int INSTALL_FAILED_CONTAINER_ERROR = -18;
/**
- if the new package couldn't be installed in the specified install location.
- 无效的安装路径 */ public static final int INSTALL_FAILED_INVALID_INSTALL_LOCATION = -19;
/**
- if the new package couldn't be installed in the specified install
- location because the media is not available.
- SD卡不可用 */ public static final int INSTALL_FAILED_MEDIA_UNAVAILABLE = -20;
/**
- if the new package couldn't be installed because the verification timed out.
- 验证超时 */ public static final int INSTALL_FAILED_VERIFICATION_TIMEOUT = -21;
/**
- if the new package couldn't be installed because the verification did not succeed.
- 验证失败 */ public static final int INSTALL_FAILED_VERIFICATION_FAILURE = -22;
/**
- if the package changed from what the calling program expected.
- 预期的应用被改变 */ public static final int INSTALL_FAILED_PACKAGE_CHANGED = -23;
/**
- if the parser was given a path that is not a file, or does not end
- with the expected '.apk' extension.
- 解析失败，不是APK */ public static final int INSTALL_PARSE_FAILED_NOT_APK = -100;
/**
- if the parser was unable to retrieve the AndroidManifest.xml file.
- 解析失败，无法提取Manifest */ public static final int INSTALL_PARSE_FAILED_BAD_MANIFEST = -101;
/**
- if the parser encountered an unexpected exception.
- 解析失败，无法预期的异常 */ public static final int INSTALL_PARSE_FAILED_UNEXPECTED_EXCEPTION = -102;
/**
- if the parser did not find any certificates in the .apk.
- 解析失败，找不到证书 */ public static final int INSTALL_PARSE_FAILED_NO_CERTIFICATES = -103;
/**
- if the parser found inconsistent certificates on the files in the .apk.
- 解析失败，证书不一致 */ public static final int INSTALL_PARSE_FAILED_INCONSISTENT_CERTIFICATES = -104;
/**
- if the parser encountered a CertificateEncodingException in one of the
- files in the .apk.
- 解析失败，证书编码异常 */ public static final int INSTALL_PARSE_FAILED_CERTIFICATE_ENCODING = -105;
/**
- if the parser encountered a bad or missing package name in the manifest.
- 解析失败，manifest中的包名错误或丢失 */ public static final int INSTALL_PARSE_FAILED_BAD_PACKAGE_NAME = -106;
/**
- if the parser encountered a bad shared user id name in the manifest.
- 解析失败，manifest中的共享用户错误 */ public static final int INSTALL_PARSE_FAILED_BAD_SHARED_USER_ID = -107;
/**
- if the parser encountered some structural problem in the manifest.
- 解析失败，manifest中出现结构性错误 */ public static final int INSTALL_PARSE_FAILED_MANIFEST_MALFORMED = -108;
/**
- if the parser did not find any actionable tags (instrumentation or application)
- in the manifest.
- 解析失败，manifest中没有actionable tags */ public static final int INSTALL_PARSE_FAILED_MANIFEST_EMPTY = -109;
/**
- if the system failed to install the package because of system issues.
- 系统问题导致安装失败 */ public static final int INSTALL_FAILED_INTERNAL_ERROR = -110;