在起始页

//得到签名
PackageInfo packageInfo = null;
try {
    packageInfo = getPackageManager().getPackageInfo(getPackageName(), PackageManager.GET_SIGNATURES);
    Signature[] signs = packageInfo.signatures;
    String signStr = md5(signs[0].toCharsString());
    LogUtil.getInstance().e(signStr);
    if(MyNdk.getInstance().getSecretF(signStr)==0){//从jni获取到签名对比
      finish();
    }
} catch (PackageManager.NameNotFoundException e) {
    e.printStackTrace();
}