android 获取包名通过包名获取应用签名

MainActivity  代码：private Signature[] getRawSignature(Context paramContext, String paramString) {    if ((paramString == null) || (paramString.length() == 0)) {        return null;    }    PackageManager localPackageManager = paramContext.getPackageManager();    PackageInfo localPackageInfo;    try {        localPackageInfo = localPackageManager.getPackageInfo(paramString, PackageManager.GET_SIGNATURES);        if (localPackageInfo == null) {            return null;        }    } catch (PackageManager.NameNotFoundException localNameNotFoundException) {        return null;    }    return localPackageInfo.signatures;}/** * 开始获得签名 * @param packageName 报名 * @return */private void getSign(String packageName) {    Signature[] arrayOfSignature = getRawSignature(this, packageName);    if ((arrayOfSignature == null) || (arrayOfSignature.length == 0)){        return;    }    Log.e(TAG, Md5.getMessageDigest(arrayOfSignature[0].toByteArray()));}

新建 MD5类：

public final class Md5{    public static final String getMessageDigest(byte[] paramArrayOfByte)    {        char[] arrayOfChar1 = { 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 97, 98, 99, 100, 101, 102 };        try        {            MessageDigest localMessageDigest = MessageDigest.getInstance("MD5");            localMessageDigest.update(paramArrayOfByte);            byte[] arrayOfByte = localMessageDigest.digest();            int i = arrayOfByte.length;            char[] arrayOfChar2 = new char[i * 2];            int j = 0;            int k = 0;            while (true)            {                if (j >= i)                    return new String(arrayOfChar2);                int m = arrayOfByte[j];                int n = k + 1;                arrayOfChar2[k] = arrayOfChar1[(0xF & m >>> 4)];                k = n + 1;                arrayOfChar2[n] = arrayOfChar1[(m & 0xF)];                j++;            }        }        catch (Exception localException)        {        }        return null;    }    public static final byte[] getRawDigest(byte[] paramArrayOfByte)    {        try        {            MessageDigest localMessageDigest = MessageDigest.getInstance("MD5");            localMessageDigest.update(paramArrayOfByte);            byte[] arrayOfByte = localMessageDigest.digest();            return arrayOfByte;        }        catch (Exception localException)        {        }        return null;    }}

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