قرار دادن پروگرس بار در ریسایکل ویو

import com.android.volley.Request;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;
import com.kosalgeek.android.json.JsonConverter;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

final String TAG = "MainActivity";

RecyclerView rvItem;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);

FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});

rvItem = (RecyclerView)findViewById(R.id.rvItem);

rvItem.setHasFixedSize(true);
LinearLayoutManager manager = new LinearLayoutManager(this);

rvItem.setLayoutManager(manager);

String url = "http://192.168.1.3/customer/product.php";
StringRequest stringRequest = new StringRequest(Request.Method.GET,
url,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
Log.d(TAG, response);

ArrayList<Product> productList = new JsonConverter<Product>()
.toArrayList(response, Product.class);

ProductAdapter adapter = new ProductAdapter(getApplicationContext(), productList);

rvItem.setAdapter(adapter);

}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
if(error != null){
Log.d(TAG, error.toString());
Toast.makeText(getApplicationContext(), "Something went wrong.", Toast.LENGTH_LONG).show();

}
}
}
;

MySingleton.getInstance(getApplicationContext()).addToRequestQueue(stringRequest);

}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
retu true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();

//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
retu true;
}

retu super.onOptionsItemSelected(item);
}
}