MainActivity.java 文件源码

private void updateSignatures(String packageName) {
  List<PackageInfo> list =
      getPackageManager().getInstalledPackages(PackageManager.GET_SIGNATURES);
  PackageInfo packageInfo = null;
  for (PackageInfo info : list) {
    if (info.packageName.equals(packageName)) {
      packageInfo = info;
      break;
    }
  }
  if (packageInfo == null) {
    packageView.setError("Cannot find package.");
    return;
  }
  Signature[] signs = packageInfo.signatures;
  signatures.clear();
  for (Signature sign : signs) {
    ByteString byteString = ByteString.of(sign.toByteArray());
    signatures.add(byteString.md5().hex());
  }
  signaturesView.getAdapter().notifyDataSetChanged();
}