android - Activity加载完数据后如何将数据从Activity设置到Fragment

Question

开始吧，我需要初始化一系列 fragment 类；之后，我做了一些网络请求；加载完所有数据后，我需要将我指定的数据从 Activity 传输到 Fragment，但我不知道这个过程。

代码如下:

    private Class[] mFragmentClasses = {GoodDetailsFragment.class,GoodDetailsArgumentsFragment.class};
    mIndicator.setViewPager(mViewPager);  
    mAdapter = new FragmentPagerAdapter(getSupportFragmentManager()) {  

        @Override  
        public int getCount() {  
            return mFragmentClasses.length;  
        }  

        @Override  
        public Fragment getItem(int position) {  
            try {
                return (Fragment) mFragmentClasses[position].newInstance();
            } catch (InstantiationException e) {
                e.printStackTrace();
            } catch (IllegalAccessException e) {
                e.printStackTrace();
            }  
            return null;
        }  
    };  
    mViewPager.setAdapter(mAdapter); 

那么我如何在加载网络数据后立即更新来自 Fragment 的数据。

Answer 1

一旦网络请求完成并且 Activity 处理完数据，它就可以使用接口(interface)将其传递给 fragment 。

Activity :

public class MainActivity extends Activity
{
    public interface onDataLoadedListener
    {
        public void onDataLoaded(String receivedData);
    }

    onDataLoadedListener onDataLoadedListener;

    @Override
    public void onCreate(Bundle savedInstanceState) 
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        Fragment fragment = new MyFragment();
        onDataLoadedListener = fragment;
    }

    // Some method called when you receive the data
    public void onDataReceived(String receivedData)
    {
        onDataLoadedListener.onDataLoaded(receivedData);
    }
}

fragment :

public class MyFragment extends Fragment implements onDataLoadedListener
{
    @Override
    public void onDataLoaded(receivedData)
    {
        // Handle the received data accordingly
    }
}