我正在尝试根据从第一个微调器中使用volley的json响应中选择的第一个微调器来填充三个微调器。我已经介绍了几种解决方案，但似乎都无法解决我的问题。这是代码：
json响应
{
"data": {
"materials": [
{
"id": 1,
"name": "Test",
"code": "btedv4",
"created_at": "2018-06-23 06:08:07",
"updated_at": "2018-06-23 06:08:07",
"supplier": [
{
"id": 1,
"name": "Test Supplier",
"location": "juja",
"created_at": "2018-06-25 06:37:47",
"updated_at": "2018-06-25 06:37:47",
"pivot": {
"material_id": 1,
"supplier_id": 1
}
},
{
"id": 2,
"name": "mlolongo-supplier",
"location": "Mlolongo",
"created_at": "2018-06-25 06:40:12",
"updated_at": "2018-06-25 06:40:12",
"pivot": {
"material_id": 1,
"supplier_id": 2
}
}
],
"category": [
{
"id": 1,
"material_id": 1,
"name": "Machine cut",
"status": 1,
"created_at": "2018-06-25 06:12:29",
"updated_at": "2018-06-25 06:12:29",
"quality": [
{
"id": 1,
"category_id": 1,
"value": "Premium",
"status": 1,
"created_at": "2018-06-25 06:18:44",
"updated_at": "2018-06-25 06:18:44",
"size": [
{
"id": 1,
"quality_id": 1,
"size": "9*9",
"created_at": "2018-06-25 06:19:33",
"updated_at": "2018-06-25 06:19:33",
"price": {
"id": 1,
"material_size_id": 1,
"cost": 37,
"unit_measure": 1,
"created_at": "2018-06-25 06:21:10",
"updated_at": "2018-06-25 06:21:10"
}
}
]
}
]
}
]
},
Java代码：
一种材料有多个供应商
private void loadSpinnerData(String url) {
final List<Model_Material> materialsList = new ArrayList<>();
final List<String> materials_item_list = new ArrayList<>();
com.android.volley.RequestQueue requestQueue = Volley.newRequestQueue(getApplicationContext());
StringRequest stringRequest = new StringRequest(Request.Method.GET, url, new com.android.volley.Response.Listener<String>() {
@Override
public void onResponse(String response) {
try {
JSONObject jsonObject = new JSONObject(response);
if (jsonObject != null) {
JSONObject data = jsonObject.getJSONObject("data");
JSONArray materials = data.getJSONArray("materials");
if (materials != null) {
for (int i = 0; i < materials.length(); i++) {
JSONObject material_items = materials.getJSONObject(i);
String material_name = material_items.getString("name");
JSONArray supplier = material_items.getJSONArray("supplier");
/*loop thro suppliers*/
List<String> supplierList = new ArrayList<>();
for (int j = 0; j < supplier.length(); j++) {
JSONObject supplier_items = supplier.getJSONObject(j);
if (supplier != null) {
if (supplierList.contains(supplier.getJSONObject(j).getString("name"))) {
} else {
// store categories to arraylist
supplierList.add(supplier.getJSONObject(j).getString("name"));
// Toast.makeText(getApplicationContext(), "data\n" + supplier.getJSONObject(j).getString("name"), Toast.LENGTH_SHORT).show();
}
}
materialsList.add(new Model_Material(material_name, supplierList));
materials_item_list.add(material_name);
}
}
final MaterialAdapter materialAdapter = new MaterialAdapter(SellActivity.this,
R.layout.material_list, R.id.spinnerTextItem, materialsList);
spinner_sell_material.setAdapter(materialAdapter);
spinner_sell_material.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
Model_Material model_material = materialAdapter.getItem(i);
List<String> supplier_list = model_material.getSupplier();
ArrayAdapter suppliersAdapter = new ArrayAdapter<>(SellActivity.this, R.layout.supplier_list, R.id.supplierSpinnerText, supplier_list);
spinner_sell_supplier.setAdapter(suppliersAdapter);
}
@Override
public void onNothingSelected(AdapterView<?> adapterView) {
}
});
}
}
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new com.android.volley.Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
error.printStackTrace();
}
}) {
@Override
public Map<String, String> getHeaders() throws AuthFailureError {
Map<String, String> params = new HashMap<String, String>();
String bearer = "Bearer ".concat(token);
Map<String, String> headersSys = super.getHeaders();
Map<String, String> headers = new HashMap<String, String>();
headersSys.remove("Authorization");
headers.put("Authorization", bearer);
headers.putAll(headersSys);
return headers;
}
};
MySingleton.getInstance(this).addToRequestQueue(stringRequest);
int socketTimeout = 30000;
RetryPolicy policy = new DefaultRetryPolicy(socketTimeout, DefaultRetryPolicy.DEFAULT_MAX_RETRIES, DefaultRetryPolicy.DEFAULT_BACKOFF_MULT);
stringRequest.setRetryPolicy(policy);
requestQueue.add(stringRequest);
}
//The code for Model_Material is as below:
public class Model_Material {
private String material;
private List<String> supplier;
public Model_Material(String material, List<String> supplier) {
this.material = material;
this.supplier = supplier;
}
public String getMaterial() {
return material;
}
public void setMaterial(String material) {
this.material = material;
}
public List<String> getSupplier() {
return supplier;
}
public void setSupplier(List<String> supplier) {
this.supplier = supplier;
}
}
//The code for the Material Adapter:
public class MaterialAdapter extends ArrayAdapter<Model_Material> {
private List<Model_Material> materialList = new ArrayList<>();
MaterialAdapter(@NonNull Context context, int resource, int spinnerText, @NonNull List<Model_Material> materialList) {
super(context, resource, spinnerText, materialList);
this.materialList = materialList;
}
@Override
public Model_Material getItem(int position) {
return materialList.get(position);
}
@NonNull
@Override
public View getView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
return initView(position);
}
@Override
public View getDropDownView(int position, @Nullable View convertView, @NonNull ViewGroup parent) {
return initView(position);
}
private View initView(int position) {
Model_Material state = getItem(position);
LayoutInflater inflater = (LayoutInflater) getContext().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View v = inflater.inflate(R.layout.material_list, null);
TextView textView = v.findViewById(R.id.spinnerTextItem);
textView.setText(state.getMaterial());
return v;
}
}
由于第一个微调器上选择的项目没有过滤其他微调器，我该怎么办？