android - 如何从具有图像 url 列表的服务器从 json 加载 gridview 中的图像

Question

我正在创建一个画廊应用程序..这里有描述。 http://www.androidhive.info/2012/02/android-gridview-layout-tutorial/

我能够从可绘制资源中实现这一点。我需要的是我想从服务器获取图像 url 作为 json 并显示它。我的 Json 格式是: http://52.42.251.70/testData/imagelist.php

fragment 代码:

public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        GridView gridView = (GridView)getView().findViewById(R.id.grid_view);

        // Instance of ImageAdapter Class
        gridView.setAdapter(new ImageAdapter(this.getActivity()));

        /**
         * On Click event for Single Gridview Item
         * */
        gridView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                Intent i = new Intent(getActivity(), FullImageActivity.class);
                // passing array index
                i.putExtra("id", position);
                startActivity(i);
            }
        });
    }

图像适配器.java

public class ImageAdapter extends BaseAdapter {
    private Context mContext;
    JSONObject jsonobject;
    DatabaseUserTable myDatadb;
    JSONArray jsonarray;
    String imageUrl = "";
    String id = "";
    ArrayList<String> Urls = new ArrayList<String>();
    // Keep all Images in array
    public Integer[] mThumbIds = {
            R.drawable.imagewall,R.drawable.imagewall,
            R.drawable.imagewall,R.drawable.imagewall,
            R.drawable.imagewall,R.drawable.imagewall,
            R.drawable.imagewall,R.drawable.imagewall,
            R.drawable.imagewall,R.drawable.imagewall,
            R.drawable.imagewall,R.drawable.imagewall,
            R.drawable.imagewall,R.drawable.imagewall,
            R.drawable.imagewall
    };

    // Constructor
    public ImageAdapter(Context c){
        mContext = c;
    }

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

    @Override
    public Object getItem(int position) {
        return mThumbIds[position];
    }

    @Override
    public long getItemId(int position) {
        return 0;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        ImageView imageView = new ImageView(mContext);
        imageView.setImageResource(mThumbIds[position]);
        imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
        imageView.setLayoutParams(new GridView.LayoutParams(220, 220));
        return imageView;
    }
}

Answer 1

您可以使用 picasso 库来做同样的事情。

配置

将 compile 'com.squareup.picasso:picasso:2.5.2' 放入您的模块级 build.gradle 文件中。

使用

替换 imageView.setImageResource(mThumbIds[position]);with Picasso.with(getActivity()).load("图片的 URL").into(imageView);

对于您的网址，它似乎是一个图像网址列表。因此您可以在收到响应后将此列表传递给您的适配器。