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Custom class loading/overriding Android-native classes
/**
 * Returns the class with the specified name if it has already been loaded
 * by the virtual machine or {@code null} if it has not yet been loaded.
 *
 * @param className
 *            the name of the class to look for.
 * @return the {@code Class} object or {@code null} if the requested class
 *         has not been loaded.
 */
protected final Class<?> findLoadedClass(String className) {
    ClassLoader loader;
    if (this == BootClassLoader.getInstance())
        loader = null;
    else
        loader = this;
    return VMClassLoader.findLoadedClass(loader, className);
}