本 Map 像通过android中的本地json-Java 学习之路

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 . 该图像将是本地文件和可绘制文件夹中的图像 .

data / listview类似于http://wptrafficanalyzer.in/blog/android-itemclicklistener-for-a-listview-with-images-and-text/

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 .

那么如何在JSON中“引用”图像或图像名称？如何在创建列表视图时实际访问图像？

1 回答

让我们假设您的 drawable 文件夹中有一些图像：

drawable
    image_name_1
    image_name_2
    image_name_3
    image_name_4
    ...

将图像的名称放到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);
    }

Update

将图像资源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);
    }

回复于 2024-04-25T20:47:37+08:00

本 Map 像通过android中的本地json

1 回答

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