Question

我正在尝试从JSONArray中显示Android中的项目ListView，如下所示

{"myArray":[{"id":"816","name":"Shopping","uid":"20"},{"id":"817","name":"Grocery","uid":"20"},{"id":"818","name":"Entertainment","uid":"20"},{"id":"819","name":"Maid\/Driver","uid":"20"}]}

我想在Listview中显示这些内容，如下所示

816 Shopping 20
817 Grocery 20
818 Environment 20
819 Maid\/Driver 20

这是我正在处理的java代码

    JSONArray the_json_array = jObj.getJSONArray("myArray");

    List<String> list = new ArrayList<String>();
    for (int i=0; i<the_json_array.length(); i++) {
        list.add( the_json_array.getString(i) );
    }
    String[] stringArray = list.toArray(new String[list.size()]);


    final ArrayAdapter adapter = new ArrayAdapter<String>(TransactionCategory.this,android.R.layout.simple_list_item_1,stringArray);
    ListView listView = (ListView) findViewById(R.id.listView2);
    listView.setAdapter(adapter);

    listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
     @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

     // my actions on list items
    }
  });

我遇到for循环的问题

我只需要为ListView中的每个项目获取值。

Answer 1

尝试使用Gson解析json，如下面的代码所示：

public class Item {

    @SerializedName("id")
    private String id;

    @SerializedName("name")
    private String name;

    @SerializedName("uid")
    private String uid;

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    @Override
    public String toString() {
        return id + " " + name + " " + uid;
    }
}

public class ItemList {

    @SerializedName("myArray")
    private List<Item> items;

    public List<Item> getItems() {
        if (items == null) {
            items = new ArrayList<>();
        }

        return items;
    }

}

然后更改您的代码：

...

Gson gson = new Gson();
ItemList itemList = gson.fromJson(jObj, ItemList.class);

final ArrayAdapter adapter = new ArrayAdapter<Item>(TransactionCategory.this,android.R.layout.simple_list_item_1, itemList.getItems());
ListView listView = (ListView) findViewById(R.id.listView2);
listView.setAdapter(adapter);

listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {

    @Override
    public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
        // my actions on list items
    }
}

...

转换JSON数组以在Android列表视图中显示多个项目

1 个答案: