Fragment中不能使用自定义带参构造函数

Posted 2020-11-24 ganchuanpu

通过Fragment自定义的静态方法将值从activity传到fragment中，然后就想到这样不是多次一举吗，为什么不直接写个带参构造函数将值传过去呢？试了一下，发现Fragment有参构造函数竟然报错，抱歉写了这么长时间代码对Fragment还不是很会用，笑哭，感觉任重道远啊...android中Fragment的构造函数

String[] titles = {
                GlobalConfig.CATEGORY_NAME_APP,
                GlobalConfig.CATEGORY_NAME_android,
                GlobalConfig.CATEGORY_NAME_ios,
                GlobalConfig.CATEGORY_NAME_FRONT_END,
                GlobalConfig.CATEGORY_NAME_RECOMMEND,
                GlobalConfig.CATEGORY_NAME_RESOURCE};

        CommonViewPagerAdapter infoPagerAdapter = new CommonViewPagerAdapter(getSupportFragmentManager(),titles);
        // App
        CategoryFragment appFragment = CategoryFragment.newInstance(titles[0]);
        // Android
        CategoryFragment androidFragment = CategoryFragment.newInstance(titles[1]);
        // iOS
        CategoryFragment iOSFragment = CategoryFragment.newInstance(titles[2]);
        // 前端
        CategoryFragment frontFragment = CategoryFragment.newInstance(titles[3]);
        // 瞎推荐
        CategoryFragment referenceFragment = CategoryFragment.newInstance(titles[4]);
        // 拓展资源s
        CategoryFragment resFragment = CategoryFragment.newInstance(titles[5]);

        infoPagerAdapter.addFragment(appFragment);
        infoPagerAdapter.addFragment(androidFragment);
        infoPagerAdapter.addFragment(iOSFragment);
        infoPagerAdapter.addFragment(frontFragment);
        infoPagerAdapter.addFragment(referenceFragment);
        infoPagerAdapter.addFragment(resFragment);

 

public static CategoryFragment newInstance(String mCategoryName) {
        CategoryFragment categoryFragment = new CategoryFragment();
        Bundle bundle = new Bundle();
        bundle.putString(CATEGORY_NAME, mCategoryName);
        categoryFragment.setArguments(bundle);
        return categoryFragment;
    }

 

@Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View view = inflater.inflate(R.layout.fragment_blank, container, false);
        ButterKnife.bind(this, view);

        //取出传过来的值
        Bundle bundle = getArguments();
        mTitle  = bundle.getString(ARG_TITLE);

        return view;
    }