Question

我有ArrayAdapter如下

ArrayAdapter<String>dataAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_dropdown_item);

这是我将用于Spinner的适配器。我的Spinner文件中有strings.xml的值集（字符串数组）。

如何实际将<string-array> string.xml设置为微调器？请帮忙！

Answer 1

创建时只需将其添加到ArrayAdapter即可。

String[] yourArray = getResources().getStringArray(R.array.array_name);

ArrayAdapter<String>dataAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_dropdown_item, yourArray);

Answer 2

您可以尝试这样的事情：

String[] mTestArray;
ArrayAdapter<String>dataAdapter;

mTestArray = getResources().getStringArray(R.array.testArray);
dataAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_dropdown_item,mTestArray);

然后将适配器连接到Spinner。

spinner.setAdapter(dataAdapter);

希望这有帮助!!!

Answer 3

本教程：Android Spinners指出您将使用以下代码根据资源设置Spinner数组：

ArrayAdapter<CharSequence> dataAdapter = ArrayAdapter.createFromResource(this,
    R.array.string-array-id, android.R.layout.simple_spinner_item);
dataAdapter .setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner.setAdapter(adapter);

使用createFromResource()方法而不是new并提供数组的资源ID应提供预期的结果。有关更多详细信息，请参阅教程。

Answer 4

spinner2 = (Spinner) findViewById(R.id.spinner2);
ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_spinner_dropdown_item);  
String[] itemNames = getResources().getStringArray(R.array.stringArrayName); 

   for (int i = 0; i < 16; i++) // Maximum size of i upto --> Your Array Size 
    {  
    dataAdapter.add(itemNames[i]);  
     } 

spinner2.setAdapter(dataAdapter);

Answer 5

如果要从Web服务加载数据并将其设置在微调器中，则可以使用以下代码：-

public class MainActivity extends AppCompatActivity {

    Spinner spinner;
    List<String> usersList;
    ArrayAdapter<String> catAdapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        spinner = (Spinner)findViewById(R.id.spinner);
        usersList = new ArrayList<String>();

        catAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, usersList);
        spinner.setAdapter(catAdapter);

        getHttpResponse();

    }

    public void getHttpResponse() {

        String url = "https://cakeapi.trinitytuts.com/api/listuser";

        OkHttpClient client = new OkHttpClient();

        Request request = new Request.Builder()
                .url(url)
                .header("Accept", "application/json")
                .header("Content-Type", "application/json")
                .build();

        client.newCall(request).enqueue(new Callback() {

            @Override
            public void onFailure(Call call, IOException e) {
                String mMessage = e.getMessage().toString();
                Log.w("failure Response", mMessage);
                //call.cancel();
            }

            @Override
            public void onResponse(Call call, Response response) throws IOException {

                final String mMessage = response.body().string();

                MainActivity.this.runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        Log.e("Response", mMessage);
                        try {
                            JSONObject users = new JSONObject(mMessage);
                            JSONArray usersArr = users.getJSONArray("users");

                            for(int i =0; i < usersArr.length(); i++){
                                JSONObject user = usersArr.getJSONObject(i);
                                Log.e("user", user.getString("username"));
                                usersList.add(user.getString("username"));
                            }

                            catAdapter.notifyDataSetChanged();


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

                    }
                });
            }
        });
    }
}

您可以阅读这篇文章的完整信息：-Add dynamic data to spinner

动态设置微调器的值

5 个答案: