获取APK签名

获取apk签名工具类

import android.content.Context; import android.content.pm.PackageInfo; import android.content.pm.PackageManager; import android.content.pm.Signature; import android.os.Build; import android.util.DisplayMetrics; import java.io.File; import java.io.UnsupportedEncodingException; import java.lang.reflect.Constructor; import java.lang.reflect.Field; import java.lang.reflect.Method; import java.security.MessageDigest; import java.security.NoSuchAlgorithmException; import java.util.Iterator; import java.util.List; /** * apk 签名工具类 */
public class SignUtils { /** * 获取未安装Apk的签名 * * @param apkPath * @return
     */
    public static String getApkSignature(String apkPath) { String PATH_PackageParser = "android.content.pm.PackageParser"; try { // apk包的文件路径 // 这是一个Package 解释器, 是隐藏的 // 构造函数的参数只有一个, apk文件的路径
            Class<?> pkgParserCls = Class.forName(PATH_PackageParser); Class<?>[] typeArgs = new Class[1]; typeArgs[0] = String.class; Object[] valueArgs = new Object[1]; valueArgs[0] = apkPath; Object pkgParser; if (Build.VERSION.SDK_INT > 19) { pkgParser = pkgParserCls.newInstance(); } else { Constructor constructor = pkgParserCls.getConstructor(typeArgs); pkgParser = constructor.newInstance(valueArgs); } // 这个是与显示有关的, 里面涉及到一些像素显示等等, 我们使用默认的情况
            DisplayMetrics metrics = new DisplayMetrics(); metrics.setToDefaults(); // PackageParser.Package mPkgInfo = packageParser.parsePackage(new // File(apkPath), apkPath, // metrics, 0);
            Object pkgParserPkg = null; if (Build.VERSION.SDK_INT > 19) { valueArgs = new Object[2]; valueArgs[0] = new File(apkPath); valueArgs[1] = PackageManager.GET_SIGNATURES; Method pkgParser_parsePackageMtd = pkgParserCls.getDeclaredMethod( "parsePackage", typeArgs); pkgParser_parsePackageMtd.setAccessible(true); typeArgs = new Class[2]; typeArgs[0] = File.class; typeArgs[1] = int.class; pkgParserPkg = pkgParser_parsePackageMtd.invoke(pkgParser, valueArgs); } else { typeArgs = new Class[4]; typeArgs[0] = File.class; typeArgs[1] = String.class; typeArgs[2] = DisplayMetrics.class; typeArgs[3] = int.class; Method pkgParser_parsePackageMtd = pkgParserCls.getDeclaredMethod( "parsePackage", typeArgs); pkgParser_parsePackageMtd.setAccessible(true); valueArgs = new Object[4]; valueArgs[0] = new File(apkPath); valueArgs[1] = apkPath; valueArgs[2] = metrics; valueArgs[3] = PackageManager.GET_SIGNATURES; pkgParserPkg = pkgParser_parsePackageMtd.invoke(pkgParser, valueArgs); } typeArgs = new Class[2]; typeArgs[0] = pkgParserPkg.getClass(); typeArgs[1] = int.class; Method pkgParser_collectCertificatesMtd = pkgParserCls.getDeclaredMethod("collectCertificates", typeArgs); valueArgs = new Object[2]; valueArgs[0] = pkgParserPkg; valueArgs[1] = PackageManager.GET_SIGNATURES; pkgParser_collectCertificatesMtd.invoke(pkgParser, valueArgs); // 应用程序信息包, 这个公开的, 不过有些函数, 变量没公开
            Field packageInfoFld = pkgParserPkg.getClass().getDeclaredField( "mSignatures"); Signature[] info = (Signature[]) packageInfoFld.get(pkgParserPkg); return info[0].toCharsString(); } catch (Exception e) { e.printStackTrace(); } return null; } /** * 获取已安装apk签名 * * @param context * @param packageName * @return
     */
    public static String getInstallPackageSignature(Context context, String packageName) { PackageManager pm = context.getPackageManager(); List<PackageInfo> apps = pm .getInstalledPackages(PackageManager.GET_SIGNATURES); Iterator<PackageInfo> iter = apps.iterator(); while (iter.hasNext()) { PackageInfo packageinfo = iter.next(); String thisName = packageinfo.packageName; if (thisName.equals(packageName)) { return packageinfo.signatures[0].toCharsString(); } } return null; } public static String md5(String string) { byte[] hash; try { hash = MessageDigest.getInstance("MD5").digest(string.getBytes("UTF-8")); } catch (NoSuchAlgorithmException e) { throw new RuntimeException("Huh, MD5 should be supported?", e); } catch (UnsupportedEncodingException e) { throw new RuntimeException("Huh, UTF-8 should be supported?", e); } StringBuilder hex = new StringBuilder(hash.length * 2); for (byte b : hash) { if ((b & 0xFF) < 0x10) hex.append("0"); hex.append(Integer.toHexString(b & 0xFF)); } return hex.toString(); } }

Activity调用

String sign = SignUtils.getInstallPackageSignature(LoginActivity.this, LoginActivity.this.getPackageName());