hook替换函数
```java
//Demo_clazz.getField("").setAccessible();
XposedHelpers.findAndHookMethod(Demo_clazz, "xxx", String.class, new XC_MethodReplacement() {
@Override
protected Object replaceHookedMethod(MethodHookParam methodHookParam) throws Throwable {
// 这里写能修改后的代码
return null;
}
});
```