我创建了一个单独的类，其中定义了所有有关凌空的知识，在另一个活动中，我直接传递了URL，CONTEXT和Get Response ...
但是在我的 NavDrawerActivity.java 中，如何调用 subCategoryJSON（）; 方法，而不必像使用 mainCategoryJSON（）那样再次编写我的齐射代码; 方法，我只是简单地传递URL，即方法类型。
这也是我正在使用的正确方法吗，还是需要对代码进行一些修改？我想要的是，无论我在项目中使用API还是在其中使用volley的任何地方，我都不必编写代码一次又一次地简单地传递URL，方法类型
VolleyResponseListener.java
public interface VolleyResponseListener {
void onResponse(String response, String tag);
void onError(VolleyError error, String tag);
}
CustomStringRequestVolley.java
public class CustomStringRequestVolley {
private String url;
private String tag;
Context ctx;
private VolleyResponseListener volleyResponseListener;
public CustomStringRequestVolley(String url, String tag,Context ctx,VolleyResponseListener volleyResponseListener){
this.url = url;
this.tag = tag;
this.ctx=ctx;
this.volleyResponseListener = volleyResponseListener;
sendRequest();
}
private void sendRequest() {
final ProgressDialog pDialog = new ProgressDialog(ctx);
pDialog.setMessage("Loading ...");
pDialog.show();
StringRequest stringRequest = new StringRequest(Request.Method.GET,url,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
Log.e("catresponse", "response " + response);
if (pDialog.isShowing()) {
pDialog.dismiss();
}
volleyResponseListener.onResponse(response, tag);
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
error.printStackTrace();
}
});
stringRequest.setRetryPolicy(new DefaultRetryPolicy(
5000,
DefaultRetryPolicy.DEFAULT_MAX_RETRIES,
DefaultRetryPolicy.DEFAULT_BACKOFF_MULT));
VolleySingleton.getInstance(ctx).addToRequestQueue(stringRequest);
}
}
NavDrawerActivity.java
public class NavDrawerActivity extends AppCompatActivity
implements NavigationView.OnNavigationItemSelectedListener, VolleyResponseListener {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_nav_drawer);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
mainCategoryJSON();
subCategoryJSON();
}
private void mainCategoryJSON() {
CustomStringRequestVolley request1 = new CustomStringRequestVolley(URLs.categoryURL, "TAG1", this, this);
}
@Override
public void onResponse(String response, String tag) {
switch (tag) {
case "TAG1":
try {
Log.i("Responseeeeeezaq :", response.toString() + " " + tag);
JSONObject obj = new JSONObject(response);
JSONArray productArray = obj.getJSONArray("categories");
for (int i = 0; i < productArray.length(); i++) {
JSONObject productObject = productArray.getJSONObject(i);
CategoryModelClass categoryModelClass = new CategoryModelClass();
categoryModelClass.setCategoryID(productObject.getInt("Category-Id"));
categoryModelClass.setCategoryName(productObject.getString("Category-Name"));
categoryModelClass.setCategoryImg(productObject.getString("Category-Image"));
categoryArrayList.add(categoryModelClass);
Log.d("zpuyi", String.valueOf(categoryArrayList));
}
categoryAdapter.notifyDataSetChanged();
} catch (Exception e) {
e.printStackTrace();
}
break;
}
}
@Override
public void onError(VolleyError error, String tag) {
VolleyLog.e("Error: ", error.getMessage());
}
private void subCategoryJSON() {
StringRequest stringRequest = new StringRequest(Request.Method.GET, URLs.subcategoryURL,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
Log.d("subcategoryJsonResponse", response.toString());
try {
JSONObject obj = new JSONObject(response);
JSONArray productArray = obj.getJSONArray("sub-categories");
for (int i = 0; i < productArray.length(); i++) {
JSONObject productObject = productArray.getJSONObject(i);
SubCategoryModelClass subCategoryModelClass = new SubCategoryModelClass();
subCategoryModelClass.setSubCategory_Id(productObject.getInt("Subcategories-Id"));
subCategoryModelClass.setCat_id(productObject.getInt("categories-Id"));
subCategoryModelClass.setSubCategory_Name(productObject.getString("Subcategories-Name"));
subCategoryModelClass.setSubCategory_Img(productObject.getString("Subcategories-Image"));
subCategoryModelClassList.add(subCategoryModelClass);
Log.d("subCategoryArraylist", String.valueOf(subCategoryModelClassList));
}
for (int i = 0; i < subCategoryModelClassList.size(); i++) {
subcategory_id = subCategoryModelClassList.get(i).getSubCategory_Id();
category_id = subCategoryModelClassList.get(i).getCat_id();
subcategory_name = subCategoryModelClassList.get(i).getSubCategory_Name();
// subcategory_desc = subCategoryModelClassList.get(i).getSubCategory_Desc();
subcategory_image = subCategoryModelClassList.get(i).getSubCategory_Img();
Log.d("fdsaff", subcategory_image);
SQLiteDatabase database = dbHelper.getWritableDatabase();
dbHelper.insertSubCategoryProduct(subcategory_id, category_id, subcategory_name, "https://www.ecrm.sample.in/app/img/"+subcategory_image, database);
dbHelper.close();
}
subCategoryAdapter.notifyDataSetChanged();
} catch (JSONException e) {
e.printStackTrace();
}
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
VolleyLog.e("Error: ", error.getMessage());
}
});
VolleySingleton.getInstance(getApplicationContext()).addToRequestQueue(stringRequest);
}
}
答案 0 :(得分：0)
您已经正确编写了答案，但是您没有在活动类中实现书面的自定义齐射类代码。
首先如下定义排球的接口类，
现在在您编写自定义排球类的java类中实现排球接口，如下所示：
CustomStringRequestVolley.java
public class CustomStringRequestVolley implements volleyCallback {
public Context context;
public CustomStringRequestVolley(Context context) {
this.context = context;
}
public interface volleyCallback {
void onSuccess(String result);
void onError(String error);
}
public void callGetServer(String URL, final
volleyCallback callback){
if (!checkInternetConnection(context)) {
showNoInternetDialogue(context);
return;
}
RequestQueue requestQueue = Volley.newRequestQueue(context);
StringRequest stringRequest = new StringRequest(Request.Method.GET, URL, new
Response.Listener<String>() {
@Override
public void onResponse(String response) {
callback.onSuccess(response);
}
}, error -> {
if (error.networkResponse == null){
if (error.getClass().equals(TimeoutError.class)){
Toast.makeText(context, "Timeout.Please try again",
Toast.LENGTH_SHORT).show();
}else if (error.getClass().equals(NoConnectionError.class)){
Toast.makeText(context, "Timeout.Please try again", Toast.LENGTH_SHORT).show();
}else if (error.getClass().equals(NetworkError.class)) {
Toast.makeText(context, "Network Error.Please try again", Toast.LENGTH_SHORT).show();
}else if (error.getClass().equals(ParseError.class)){
Toast.makeText(context, "Parse error", Toast.LENGTH_SHORT).show();
}else if (error.getClass().equals(ServerError.class)){
Toast.makeText(context, "Server Error.Please try again", Toast.LENGTH_SHORT).show();
}
else {
parseVolleyError(error);
}
}
}
) {
@Override
protected Map<String, String> getParams() {
return new HashMap<>();
}
@Override
public Map<String, String> getHeaders() {
Map<String, String> headers = new HashMap<>();
headers.put("Content-Type", "application/x-www-form-urlencoded");
return headers;
}
};
//setting up the retry policy for slower connections
int socketTimeout = 120000;//120000 milli seconds - change to what you want
RetryPolicy policy = new DefaultRetryPolicy(socketTimeout,
DefaultRetryPolicy.DEFAULT_MAX_RETRIES, DefaultRetryPolicy.DEFAULT_BACKOFF_MULT);
stringRequest.setRetryPolicy(policy);
requestQueue.add(stringRequest);
}
}
现在在您需要的每项活动中使用此自定义凌空类。它减少你 样板代码
NavDrawerActivity.java
CustomStringRequestVolley customStringRequestVolley;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_starting_point_navigation);
customStringRequestVolley = new CustomStringRequestVolley(this);
}
private void subCategoryJSON() {
customStringRequestVolley.callGetServer(URLs.subcategoryURL,new volleyCallback() {
@Override
public void onSuccess(String result) {
try {
JSONObject obj = new JSONObject(response);
JSONArray productArray = obj.getJSONArray("sub-categories");
for (int i = 0; i < productArray.length(); i++) {
JSONObject productObject = productArray.getJSONObject(i);
SubCategoryModelClass subCategoryModelClass = new SubCategoryModelClass();
subCategoryModelClass.setSubCategory_Id(productObject.getInt("Subcategories-Id"));
subCategoryModelClass.setCat_id(productObject.getInt("categories-Id"));
subCategoryModelClass.setSubCategory_Name(productObject.getString("Subcategories-Name"));
subCategoryModelClass.setSubCategory_Img(productObject.getString("Subcategories-Image"));
subCategoryModelClassList.add(subCategoryModelClass);
Log.d("subCategoryArraylist", String.valueOf(subCategoryModelClassList));
}
for (int i = 0; i < subCategoryModelClassList.size(); i++) {
subcategory_id = subCategoryModelClassList.get(i).getSubCategory_Id();
category_id = subCategoryModelClassList.get(i).getCat_id();
subcategory_name = subCategoryModelClassList.get(i).getSubCategory_Name();
// subcategory_desc = subCategoryModelClassList.get(i).getSubCategory_Desc();
subcategory_image = subCategoryModelClassList.get(i).getSubCategory_Img();
Log.d("fdsaff", subcategory_image);
SQLiteDatabase database = dbHelper.getWritableDatabase();
dbHelper.insertSubCategoryProduct(subcategory_id, category_id, subcategory_name, "https://www.ecrm.sample.in/app/img/"+subcategory_image, database);
dbHelper.close();
}
subCategoryAdapter.notifyDataSetChanged();
} catch (JSONException e) {
e.printStackTrace();
}
}
@Override
public void onError(String error) {
//show error code
}
});
}
尝试使用此@Abhishek后让我知道