Question

我有一个本地json，其中包含一些显示在列表视图中的静态数据。

每个对象都应该有一个图像/徽标，也会显示在列表视图中。该图像将位于本地和可绘制文件夹中。

数据/列表视图与此http://wptrafficanalyzer.in/blog/android-itemclicklistener-for-a-listview-with-images-and-text/

类似

在本教程中，所有数据和图像都存储在数组中。我的数据存储在JSON中。

那么我如何＆＃34;参考＆＃34;使用JSON中的图像或图像名称，如何在创建列表视图时实际访问图像？

Answer 1

让我们假设您的drawable文件夹中有一些图片：

drawable
    image_name_1
    image_name_2
    image_name_3
    image_name_4
    ...

将图像名称放到json：

[
    {
        "some_field_1": "some_value_1",
        "some_field_2": "some_value_2",
        "some_field_3": "some_value_3",
        ...
        "image_name": "image_name_1"
    },
    {
        "some_field_1": "some_value_1",
        "some_field_2": "some_value_2",
        "some_field_3": "some_value_3",
        ...
        "image_name": "image_name_2"
    },
    {
        "some_field_1": "some_value_1",
        "some_field_2": "some_value_2",
        "some_field_3": "some_value_3",
        ...
        "image_name": "image_name_3"
    },
    ...
]

从JSON获取名称并加载drawab资源：

    JSONArray data; // your JSON
    Context context; // context
    Resources resources = context.getResources();
    for (int i = 0; i < data.length(); i++) {
        // getting some another JSON field

        // get image name from JSON
        String imageName = data.getJSONObject(i).getString("image_name");

        // get resource id by image name
        final int resourceId = resources.getIdentifier(imageName, "drawable", context.getPackageName());

        // get drawable by resource id
        Drawable drawable = resources.getDrawable(resourceId);

        // get bitmap by resource id
        Bitmap bitmap = BitmapFactory.decodeResource(context.getResources(), resourceId);
    }

<强>更新

将图片资源ID放入HashMap

    ...
    List<HashMap<String,String>> aList = new ArrayList<HashMap<String,String>>();

    JSONArray data; // your JSON
    Context context; // context
    Resources resources = context.getResources();
    for (int i = 0; i < data.length(); i++) {
        HashMap<String, String> hm = new HashMap<String,String>();
        hm.put("txt", "Country : " + countries[i]);
        hm.put("cur","Currency : " + currency[i]);

        // get image name from JSON
        String imageName = data.getJSONObject(i).getString("image_name");
        // get resource id by image name
        final int resourceId = resources.getIdentifier(imageName, "drawable", context.getPackageName());

        hm.put("flag", Integer.toString(resourceId) );
        aList.add(hm);
    }

Answer 2

///如果您有模型类，那么这段代码可以帮助您

 try {

        JSONObject jsonObject = new JSONObject(loadJSONFromAsset());
        JSONArray array = jsonObject.getJSONArray("Details");

        Resources resources = this.getResources();

        for (int i=0;i<array.length();i++){
            // Parse the JSON
            JSONObject jo_inside = array.getJSONObject(i);
            String title = jo_inside.getString("title");
            String img = jo_inside.getString("img");

            // get resource id by image name
            final int resourceId = resources.getIdentifier(img, "drawable", this.getPackageName());

            //load Model Class
            Model_Home data = new Model_Home(title,resourceId);
            indexList.add(data);


        }

    }catch (JSONException e){
        e.printStackTrace();
    }

Answer 3

enter  try {

    JSONObject jsonObject = new JSONObject(loadJSONFromAsset());
    JSONArray array = jsonObject.getJSONArray("Details");

    Resources resources = this.getResources();

    for (int i=0;i<array.length();i++){
        // Parse the JSON
        JSONObject jo_inside = array.getJSONObject(i);
        String title = jo_inside.getString("title");
        String img = jo_inside.getString("img");

        // get resource id by image name
        final int resourceId = resources.getIdentifier(img, "drawable", this.getPackageName());

        //load Model Class
        Model_Home data = new Model_Home(title,resourceId);
        indexList.add(data);


    }

}catch (JSONException e){
    e.printStackTrace();
}

在这里编码

本地图像通过android中的本地json

3 个答案: