获取锁屏加密时和密码一起加密的salt

GetAndroidLockSalt.java

static void getSalt() {
  try {
    Class<?> clazz = Class.forName("com.android.internal.widget.LockPatternUtils");
    Object lockUtils = clazz.getConstructor(Context.class).newInstance(this);
    Class<?> lockUtilsClazz = lockUtils.getClass();
    Method getSaltM = lockUtilsClazz.getDeclaredMethod("getSalt", int.class);
    getSaltM.setAccessible(true);
    Object saltObj = getSaltM.invoke(lockUtils, 0);
    Log.i("LouisShark", "Salt: " + saltObj);
  } catch (Exception e) {
    Log.i("LouisShark", "Err: " + Log.getStackTraceString(e));
  }

}