如何在android中将数据添加到Spinner

Question

在我的应用程序中，我想将一些数据从服务器显示到 Spinner。
对于 Spinner，我使用这个库：https://github.com/ganfra/MaterialSpinner
我的 Json：

"stars": [
      {
        "id": 105076,
        "name": "Eleanor Tomlinson",
        "character": null,
        "imageUrl": "http://example.com/cpanel/uploads/Celebrities/105076/thumb2-SK4MPEGW09.jpg",
        "userReview": ""
      },
      {
        "id": 10127,
        "name": "Aidan Turner",
        "character": null,
        "imageUrl": "http://example.com/cpanel/uploads/Celebrities/10127/thumb2-KL9G4TNGW2.jpg",
        "userReview": ""
      },
      {
        "id": 21340,
        "name": "Gabriella Wilde",
        "character": null,
        "imageUrl": "http://example.com/cpanel/uploads/Celebrities/21340/thumb2-UD5HJ2EICN.jpg",
        "userReview": ""
      }
    ]

为了连接到服务器，我使用Retrofit 库并编写以下代码：

final SerialDetailSendData sendData = new SerialDetailSendData();
sendData.setSeriesID(serialID);

InterfaceApi api = ApiClient.getClient().create(InterfaceApi.class);
Call<SeriesDetailResponse> call = api.getSeriesDetail(sendData);

call.enqueue(new Callback<SeriesDetailResponse>() {
    @Override
    public void onResponse(Call<SeriesDetailResponse> call, Response<SeriesDetailResponse> response) {
        if (response.body().getData() != null) {
            ArrayAdapter<String> adapter = new ArrayAdapter<String>(context, R.layout.spinner_hint_item,
                    ???);
            adapter.setDropDownViewResource(R.layout.spinner_dropdown_item);
            SerialReview_CastSpinner.setAdapter(adapter);

            SerialReview_CastProgress.hide();
        }
    }

    @Override
    public void onFailure(Call<SeriesDetailResponse> call, Throwable t) {
    }
});

但我不知道如何将星星类中的名称添加到 ArrayAdapter 以在 Spinner 中设置。

            ArrayAdapter<String> adapter = new ArrayAdapter<String>(context, R.layout.spinner_hint_item,
                    ???);

Answer 1

首先创建从api中检索数据的ArrayList。

ArrayList<String> arrayList = new ArrayList<String>();

arrayList.add("Item1");
arrayList.add("Item2");
arrayList.add("Item3");

并创建一个ArrayAdapter的数据。

ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String> (this,android.R.layout.simple_spinner_dropdown_item, arrayList);
spinner.setAdapter(arrayAdapter);

Answer 2

您应该只在回调中添加适配器，而不是创建适配器，因为它在对象创建中效率较低。

final ArrayAdapter<String> adapter = new ArrayAdapter<String>(context, android.R.layout.simple_spinner_dropdown_item);
adapter.setDropDownViewResource(R.layout.spinner_dropdown_item);
spinner.setAdapter(adapter);

call.enqueue(new Callback<SeriesDetailResponse>() {
    @Override
    public void onResponse(Call<SeriesDetailResponse> call, Response<SeriesDetailResponse> response) {
        SeriesDetailResponse body = response.body();
        List<Star> stars = body.getStars();

        adapter.clear();
        for (Star star : stars) {
            adapter.add(star.toString());
        }

        progress.hide();
    }

如果您有 List<String> 和 ArrayAdapter<String> 或使用 ArrayAdapter<Star>，则可以使用 adapter.addAll() 缩短该循环

Answer 3

试试这个代码：

    final SerialDetailSendData sendData = new SerialDetailSendData();
    sendData.setSeriesID(serialID);

    InterfaceApi api = ApiClient.getClient().create(InterfaceApi.class);
    Call<SeriesDetailResponse> call = api.getSeriesDetail(sendData);

    call.enqueue(new Callback<SeriesDetailResponse>() {
        @Override
        public void onResponse(Call<SeriesDetailResponse> call, Response<SeriesDetailResponse> response) {
            if (response.body().getData() != null) {
                ArrayList<String> arrayList = new ArrayList<String>();
                for (int i = 0; i < response.body().getData().getStars().size(); i++) {
                    arrayList.add(response.body().getData().getStars().get(i).getName());
                }
                ArrayAdapter<String> adapter = new ArrayAdapter<String>(context, R.layout.spinner_hint_item, arrayList);
                adapter.setDropDownViewResource(R.layout.spinner_dropdown_item);
                SerialReview_CastSpinner.setAdapter(adapter);

                SerialReview_CastProgress.hide();
            }
        }

        @Override
        public void onFailure(Call<SeriesDetailResponse> call, Throwable t) {
        }
    });