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Unable to instantiate fragment make sure class name exists, is public, and has an empty constructor

时间:2024-3-2 19:56     作者:韩俊     分类: Android


据说这是自定义Fragment的Bug。自定义Fragment中的构造方法不能传参数,下面是出错的代码:

    public ListFragment(String url, int saleway, int page) {
        super();
        this.mUrl = url;
        this.mCurrentPage = page;
        this.mSaleway = saleway;
        this.mPage = page;
        this.mParams = getParams(saleway, page);
    }

通过stackoverflow查到方法,修改后代码如下:

    public ListFragment() {
        super();
    }

    public static final ListFragment get(String url, int saleway, int page) {
        ListFragment fragment = new ListFragment();
        Bundle bundle  = new Bundle();
        bundle.putString(BUNDLE_URL, url);
        bundle.putInt(BUNDLE_SALEWAY, saleway);
        bundle.putInt(BUNDLE_PAGE, page);
        fragment.setArguments(bundle);
        return fragment;
    }
实例化有参数的对象只能通过静态方法get中的Bundle来传递参数。


下面是获取Bundle中的数据

<pre name="code" class="java">public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        Bundle bundle;
        if((bundle = getArguments()) != null) {
            mUrl = bundle.getString(BUNDLE_URL);
            mSaleway = bundle.getInt(BUNDLE_SALEWAY);
            mCurrentPage = mPage = bundle.getInt(BUNDLE_PAGE);
            mParams = getParams(mSaleway, mPage);
        }
}


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标签: android

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