有一个GridView显示来自URL路径的图像片段 [英] Fragment having a GridView to show images from url path

问题描述

我试图做一个GridView，显示图像等它显示在GridView，但没有图像，如果点击它框在GridView弹出的链接。我有不知道为什么我的图片是在GridView的失踪......

我的继承人片段类

 公共类FragmentD扩展片段{
    公共FragmentD（）{}
    @覆盖
    公共查看onCreateView（LayoutInflater充气器，容器的ViewGroup，
                         捆绑savedInstanceState）{    查看rootView = inflater.inflate（R.layout.fragment_d，集装箱，FALSE）;    尝试{
        的EditText main_searchField =（EditText上）rootView.findViewById（R.id.editText_search_d）;
        。字符串main_search = main_searchField.getText（）的toString（）;        微调main_categoryField =（微调）rootView.findViewById（R.id.spinner_d）;
        串类= main_categoryField.getSelectedItem（）的toString（）。        GridView控件main_gridviewField =（GridView控件）rootView.findViewById（R.id.gridView_main）;
        main_gridviewField.setAdapter（新MyGridViewAdapter（getActivity（）））;
        main_gridviewField.setOnItemClickListener（新AdapterView.OnItemClickListener（）{            公共无效onItemClick（适配器视图＆LT;＆GT;为arg0，观景，INT位置，长ARG3）{
                Toast.makeText（getActivity（），MyGridViewConfig.getResim_list（）。
                        得到（位置），Toast.LENGTH_SHORT）.show（）;            }
        }）;        如果（main_gridviewField.isActivated（））{
            。ImageView的sad_face =（ImageView的）getActivity（）findViewById（R.id.imageView_main_sadface）;
            sad_face.setVisibility（View.INVISIBLE）;
            。TextView的nosuchdata =（TextView中）getActivity（）findViewById（R.id.textView_main_nodatafound）;
            nosuchdata.setVisibility（View.INVISIBLE）;
        }
    }赶上（例外五）{
        Toast.makeText（getActivity（），EPIC FAIL，Toast.LENGTH_LONG）.show（）;
    }    //新search_mainActivity（getActivity（））执行（main_search，类别）。    返回rootView;
}}
 

我的继承人适配器

 公共类MyGridViewAdapter扩展BaseAdapter实现ListAdapter {私人上下文的背景下;公共MyGridViewAdapter（上下文的背景下）{
    超（）;
    this.context =背景;    MyGridViewConfig.addImageUrls（）;
}
公众诠释的getCount（）{
    返回MyGridViewConfig.getResim_list（）的大小（）。}公共对象的getItem（INT位置）{    返回MyGridViewConfig.getResim_list（）获得（位置）。
}
众长getItemId（INT位置）{    返回的位置;
}公共查看getView（INT位置，查看convertView，父母的ViewGroup）{
    ImageView的ImageView的;
    如果（convertView == NULL）
    {
        ImageView的=新ImageView的（上下文）;
        imageView.setLayoutParams（新GridView.LayoutParams（100,100））;
        imageView.setScaleType（ImageView.ScaleType.CENTER_CROP）;
        imageView.setPadding（5,5,5,5）;
    }其他{
        ImageView的=（ImageView的）convertView;    }    imageView.setImageDrawable（LoadImageFromURL（MyGridViewConfig。
            。getResim_list（）获得（位置）））;
    返回ImageView的;
}私人绘制对象LoadImageFromURL（字符串URL）{
    尝试
    {
        InputStream为=（InputStream的）新的URL（网址）.getContent（）;
        可绘制D = Drawable.createFromStream（是，SRC）;
        返回D组;
    }赶上（例外五）{
        的System.out.println（E）;        返回null;
    }
}
}
 

我的继承人配置的java

 公共类MyGridViewConfig {私有静态的ArrayList＆LT;串GT; resim_list =新的ArrayList＆LT;串GT;（）;公共静态的ArrayList＆LT;串GT; getResim_list（）{
    返回resim_list;}公共静态无效setResim_list（ArrayList的＆LT;串GT; resim_list）{
    MyGridViewConfig.resim_list = resim_list;
}
公共静态无效addImageUrls（）{
    //这里你要指定图像的URL路径    resim_list.add(\"http://fc08.deviantart.net/fs71/f/2010/319/d/6/neko_chibi__s_by_alykun17-d32y2v5.jpg\");
    resim_list.add(\"http://fc08.deviantart.net/fs71/f/2010/319/d/6/neko_chibi__s_by_alykun17-d32y2v5.jpg\");
    resim_list.add(\"http://fc08.deviantart.net/fs71/f/2010/319/d/6/neko_chibi__s_by_alykun17-d32y2v5.jpg\");
    resim_list.add(\"http://fc08.deviantart.net/fs71/f/2010/319/d/6/neko_chibi__s_by_alykun17-d32y2v5.jpg\");
    resim_list.add(\"http://fc08.deviantart.net/fs71/f/2010/319/d/6/neko_chibi__s_by_alykun17-d32y2v5.jpg\");
    resim_list.add(\"http://fc08.deviantart.net/fs71/f/2010/319/d/6/neko_chibi__s_by_alykun17-d32y2v5.jpg\");}
}
 

解决方案

您不能在你的主UI线程下载图像，这样做在AsyncTask的。创建这个类：

 类LoadImageTask扩展的AsyncTask＆LT;弦乐，太虚，可绘制＆GT; {
    公共LoadImageTask（ImageView的四）
    {
        ImageView的= IV;
    }
    ImageView的ImageView的;
    保护可绘制doInBackground（字符串的URL ...）{
        尝试{
            URLConnection的连接=新的URL（网址[0]）的openConnection（）。
            connection.connect（）;
            InputStream为=（InputStream的）connection.getContent（）;
            可绘制D = Drawable.createFromStream（是，SRC）;
            返回D组;
        }赶上（例外五）{
            // e.printStackTrace（）;
            返回null;
        }
    }    保护无效onPostExecute（绘制对象绘制）{
        如果（绘！= NULL）
            imageView.setImageDrawable（绘制）;
    }
}
 

然后改变你的getView（）函数使用的AsyncTask代替LoadImageFromURL：

  // imageView.setImageDrawable（LoadImageFromURL（MyGridViewConfig。
// getResim_list（）获得（位置）））;
新LoadImageTask（ImageView的）.execute（MyGridViewConfig.getResim_list（）获得（位置）。）;
 

I'm trying to make a gridview that shows images and So it shows the gridview but no images, if clicked it boxes the gridview pops out the link. i got no idea why my images is missing on the gridview...

heres my fragment class

public class FragmentD extends Fragment {
    public FragmentD(){}
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {

    View rootView = inflater.inflate(R.layout.fragment_d, container, false);

    try {
        EditText main_searchField = (EditText) rootView.findViewById(R.id.editText_search_d);
        String main_search = main_searchField.getText().toString();

        Spinner main_categoryField = (Spinner) rootView.findViewById(R.id.spinner_d);
        String category = main_categoryField.getSelectedItem().toString();

        GridView main_gridviewField = (GridView) rootView.findViewById(R.id.gridView_main);
        main_gridviewField.setAdapter(new MyGridViewAdapter(getActivity()));


        main_gridviewField.setOnItemClickListener(new AdapterView.OnItemClickListener()  {

            public void onItemClick(AdapterView<?> arg0, View view, int position,long arg3) {
                Toast.makeText(getActivity(), MyGridViewConfig.getResim_list().
                        get(position), Toast.LENGTH_SHORT).show();

            }
        });

        if(main_gridviewField.isActivated()){
            ImageView sad_face = (ImageView)getActivity().findViewById(R.id.imageView_main_sadface);
            sad_face.setVisibility(View.INVISIBLE);
            TextView nosuchdata = (TextView)getActivity().findViewById(R.id.textView_main_nodatafound);
            nosuchdata.setVisibility(View.INVISIBLE);
        }


    } catch (Exception e){
        Toast.makeText(getActivity(), "EPIC FAIL", Toast.LENGTH_LONG).show();
    }

    //new search_mainActivity(getActivity()).execute(main_search, category);

    return rootView;
}

}

heres my adapter

public class MyGridViewAdapter extends BaseAdapter implements ListAdapter {

private Context context;

public MyGridViewAdapter(Context context) {
    super();
    this.context = context;

    MyGridViewConfig.addImageUrls();
}


public int getCount() {
    return MyGridViewConfig.getResim_list().size();

}

public Object getItem(int position) {

    return MyGridViewConfig.getResim_list().get(position);
}


public long getItemId(int position) {

    return position;
}

public View getView(int position, View convertView, ViewGroup parent) {
    ImageView imageView;
    if(convertView==null)
    {
        imageView=new ImageView(context);
        imageView.setLayoutParams(new GridView.LayoutParams(100,100));
        imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
        imageView.setPadding(5,5,5,5);
    }else{
        imageView=(ImageView)convertView;

    }

    imageView.setImageDrawable(LoadImageFromURL(MyGridViewConfig.
            getResim_list().get(position)));
    return imageView;
}

private Drawable LoadImageFromURL(String url)

{
    try
    {
        InputStream is = (InputStream) new URL(url).getContent();
        Drawable d = Drawable.createFromStream(is, "src");
        return d;
    }catch (Exception e) {
        System.out.println(e);

        return null;
    }
}
}

heres my config java

public class MyGridViewConfig {

private static ArrayList<String> resim_list=new ArrayList<String>();

public static ArrayList<String> getResim_list() {
    return resim_list;

}

public static void setResim_list(ArrayList<String> resim_list) {
    MyGridViewConfig.resim_list = resim_list;
}
public static void addImageUrls(){
    //  Here you have to specify your image url path

    resim_list.add("http://fc08.deviantart.net/fs71/f/2010/319/d/6/neko_chibi__s_by_alykun17-d32y2v5.jpg");
    resim_list.add("http://fc08.deviantart.net/fs71/f/2010/319/d/6/neko_chibi__s_by_alykun17-d32y2v5.jpg");
    resim_list.add("http://fc08.deviantart.net/fs71/f/2010/319/d/6/neko_chibi__s_by_alykun17-d32y2v5.jpg");
    resim_list.add("http://fc08.deviantart.net/fs71/f/2010/319/d/6/neko_chibi__s_by_alykun17-d32y2v5.jpg");
    resim_list.add("http://fc08.deviantart.net/fs71/f/2010/319/d/6/neko_chibi__s_by_alykun17-d32y2v5.jpg");
    resim_list.add("http://fc08.deviantart.net/fs71/f/2010/319/d/6/neko_chibi__s_by_alykun17-d32y2v5.jpg");

}
}

解决方案

You can't download the images on your main UI thread, so do it in an AsyncTask. Create this class:

class LoadImageTask extends AsyncTask<String, Void, Drawable > {
    public LoadImageTask(ImageView iv)
    {
        imageView = iv;
    }
    ImageView imageView;
    protected Drawable doInBackground(String... urls) {
        try {
            URLConnection connection = new URL(urls[0]).openConnection();
            connection.connect();
            InputStream is = (InputStream) connection.getContent();
            Drawable d = Drawable.createFromStream(is, "src");
            return d;
        } catch (Exception e) {
            // e.printStackTrace();
            return null;
        }
    }

    protected void onPostExecute(Drawable drawable) {
        if(drawable != null)
            imageView.setImageDrawable(drawable);
    }
}

Then change your getView() function to use the AsyncTask instead of LoadImageFromURL:

// imageView.setImageDrawable(LoadImageFromURL(MyGridViewConfig.
//        getResim_list().get(position)));
new LoadImageTask(imageView).execute(MyGridViewConfig.getResim_list().get(position));

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