android - 添加 fragment 的通用方法，如何实现它

Question

我正在尝试创建用于 fragment 添加的方法，我将能够多次使用，但我遇到了一些错误。 这是我的方法:

// global variable
fragManager = getSupportFragmentManager();

private <T> void findFragmentByTagAndAdd(String fragmentTag, Class<?> cls, T t){
    Fragment fragm = fragManager.findFragmentByTag(fragmentTag);
    if (fragm == null) {
        fragm = cls.newInstance(t);
        fragManager.beginTransaction()
                .add(R.id.host_fragment_container, fragm)
                .commit();
    } 
}

Where T t is some data (for example some model class) that must be passed to setArguments of fragment's newInstance method

我得到下一个错误:

    cannot be applied to given types;
                    fragm = cls.newInstance(t);
                               ^   required: no arguments   
found: T#1   reason: actual and formal argument lists differ in length

Answer 1

替换这个:

fragm = cls.newInstance(t);

用类似的东西:

Constructor constructor = cls.getConstructor(t.getClass());
fragm = (Fragment) constructor.newInstance(t);