从 JSON 填充列表视图 [英] Populate Listview from JSON

问题描述

有谁知道动态加载Json的例子数据到 ListView，我见过的大多数例子只是使用某种静态数组.我需要加载说 10 行Json 数据，然后在底部加载更多.. 以获取下一个 10 等等请使用 Json 示例....

Does anyone know of any examples to dynamically load Json data into a ListView, most examples I have seen just use a static array of some kind. I need to load say 10 rows of Json data, then at the bottom have a load more.. to get the next 10 etc etc. Examples using Json please....

推荐答案

程序员 Bruce 是对的，没有默认的方法可以做到这一点.但是，有一种非常干净和简单的方法可以实现这一点.这是我用来处理 JSONArrays 的适配器.

Programmer Bruce is correct, there is no default way to do this. However, there is a very clean and simple way to get this accomplished. Here is the adapter I use to handle JSONArrays.

class JSONAdapter extends BaseAdapter implements ListAdapter {

    private final Activity activity;
    private final JSONArray jsonArray;
    private JSONAdapter(Activity activity, JSONArray jsonArray) {
        assert activity != null;
        assert jsonArray != null;

        this.jsonArray = jsonArray;
        this.activity = activity;
    }


    @Override public int getCount() {

        return jsonArray.length();
    }

    @Override public JSONObject getItem(int position) {

        return jsonArray.optJSONObject(position);
    }

    @Override public long getItemId(int position) {
        JSONObject jsonObject = getItem(position);

        return jsonObject.optLong("id");
    }

    @Override public View getView(int position, View convertView, ViewGroup parent) {
        if (convertView == null)
            convertView = activity.getLayoutInflater().inflate(R.layout.row, null);

        JSONObject jsonObject = getItem(position);  

        return convertView;
    }
}

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