Webサービスからデータをロードし、そのデータをスピナーに設定する場合は、次のコードを使用できます。-
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();
}
}
});
}
});
}
}
この投稿で完全な情報を読むことができます:-スピナーに動的データを追加する