Question

我有一个项目在片段中有一个gridview，显示一个游戏列表，点击每个游戏将打开一个显示游戏指南的新片段。

如何从服务器管理此阵列，当我上传更多图像时，它会使用新图像更新应用网格视图？

实际上，我需要的是：

下载并在gridview中显示图像。
将图像直接添加到服务器，让应用程序监听服务器，添加新图像后，应用程序会更新游戏的图像和标题列表，并自动显示在gridview中。（如果可能）

public class GridGameListFragment extends Fragment {

    private Context context;
    private LayoutInflater inflater;

    GridView gridView;


    public GridListaJogosFragment() {
        // Required empty public constructor
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment

        View view = inflater.inflate(R.layout.grid_lista_jogos_fragment, container, false);

      gridView = (GridView) view.findViewById(R.id.gridview_xml);

      CustomGridAdapterGameList adapter = new CustomGridAdapterGameList(getActivity());

       gridView.setAdapter(adapter);

       gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
           @Override
           public void onItemClick(AdapterView<?> parent, View view, int position, long id) {



               FragmentManager fragmentManager = getFragmentManager();
               FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();

               GuideFragment guideFragment = new GuideFragment();

               fragmentTransaction.add(R.id.rl_lista_jogos_activity_xml, guideFragment);
                fragmentTransaction.addToBackStack(null);


               fragmentTransaction.commit();

           }
       });

        return view;
    }

}

========================

public class CustomGridAdapterGameList extends BaseAdapter {

    private String[] titles = { "Final Fantasy 7",
            "Final Fantasy 8",
            "Final Fantasy 9"

    };
    private int[] covers = { R.drawable.ff7_ps1,
            R.drawable.ff8_ps1,
            R.drawable.ff9_ps1,
    };

    private Context context;
    private LayoutInflater inflater;

    public CustomGridAdapterGameList(Context context){

        this.context = context;

    }

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

    @Override
    public Object getItem(int position) {
        return titles.length;
    }

    @Override
    public long getItemId(int position) {
        return position;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {

        View gridview = convertView;

        if(convertView == null){

            inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            gridview = inflater.inflate(R.layout.custom_gridview__lista_jogos_layout, null);
        }else{
            gridview= convertView;
        }

        TextView textView = gridview.findViewById(R.id.textview_custom_grid_xml);
        ImageView imageView = gridview.findViewById(R.id.imageview_custom_grid_xml);

        textView.setText(titles[position]);
        imageView.setImageResource(covers[position]);

        return gridview;
    }
}

Answer 1

每次滚动网格视图时都会调用

getview（）。你可以使用AsyncTask下载游戏图像，然后使用setImageResourse

private class DownloadImageTask extends AsyncTask<String, Void,Bitmap> {
    ImageView bmImage;

    public DownloadImageTask(ImageView bmImage) {
        this.bmImage = bmImage;
    }

    protected Bitmap doInBackground(String... urls) {
        String urldisplay = urls[0];
        Bitmap bitmap = null;
        try {
            InputStream in = new java.net.URL(urldisplay).openStream();
            bitmap = BitmapFactory.decodeStream(in);
        } catch (Exception e) {

            e.printStackTrace();
        }
        return bitmap;
    }

    protected void onPostExecute(Bitmap result) {
        bmImage.setImageBitmap(result);
    }
}

如果您可以缓存游戏图像，而不是每次滚动下载它们，那么这是一个很好的做法

第二个问题可以通过在添加新图像时从服务器发送（消息）来解决。实现一个监听器来监听这条消息。收到后，更新您的GridView 您还可以为更简单的解决方案实施下拉刷新

如何在我的项目中使用服务器下载/显示/添加图像？

1 个答案: