我正在尝试通过url okhttp调用将数据加载到我的recyclerview中，并且收到以下错误：
“ java.lang.ClassCastException：SearchActivity无法转换为SearchForBarbershop $ BarbershopRequesterResponse”
这是课程。
SearchActivity：
public class SearchActivity extends AppCompatActivity {
private RecyclerAdapter mAdapter;
private RecyclerView mRecyclerView;
private LinearLayoutManager mLinearLayoutManager;
private ArrayList<Barbershop> barbershopList;
private SearchForBarbershop searchForBarbershop;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_search);
mRecyclerView = (RecyclerView) findViewById(R.id.my_recycler_view);
mLinearLayoutManager = new LinearLayoutManager(this);
mRecyclerView.setLayoutManager(mLinearLayoutManager);
barbershopList = new ArrayList<>();
mAdapter = new RecyclerAdapter(barbershopList);
mRecyclerView.setAdapter(mAdapter);
setRecyclerViewScrollListener();
searchForBarbershop = new SearchForBarbershop(this);
}
@Override
protected void onStart() {
super.onStart();
if (barbershopList.size() == 0) {
requestShop();
}
}
private int getLastVisibleItemPosition() {
return mLinearLayoutManager.findLastVisibleItemPosition();
}
private void setRecyclerViewScrollListener() {
mRecyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrollStateChanged(RecyclerView recyclerView, int newState) {
super.onScrollStateChanged(recyclerView, newState);
int totalItemCount = mRecyclerView.getLayoutManager().getItemCount();
if (!searchForBarbershop.isLoadingData() && totalItemCount == getLastVisibleItemPosition() + 1) {
requestShop();
}
}
});
}
private void requestShop() {
try {
searchForBarbershop.getBarbershop();
} catch (IOException e) {
e.printStackTrace();
}
}
//@Override
public void receivedNewShop(final Barbershop newBarbershop) {
runOnUiThread(new Runnable() {
@Override
public void run() {
barbershopList.add(newBarbershop);
mAdapter.notifyItemInserted(barbershopList.size());
}
});
}
}
SearchForBarbershop：
public class SearchForBarbershop {
public interface BarbershopRequesterResponse {
void receivedNewBarbershop(Barbershop barbershop);
}
private BarbershopRequesterResponse barbershopRequesterResponse;
private OkHttpClient client;
private boolean isLoadingData;
public boolean isLoadingData() { return isLoadingData; }
public SearchForBarbershop (Activity listeningActivity) {
client = new OkHttpClient();
isLoadingData = false;
barbershopRequesterResponse = (BarbershopRequesterResponse) listeningActivity;
}
public void getBarbershop() throws IOException {
String url = "http://pubapi.yp.com/search-api/search/devapi/search?searchloc=30043&term=barbers&format=json&sort=distance&radius=50&listingcount=20&key=gmj3x7mhsh";
Request request = new Request.Builder().url(url).build();
isLoadingData = true;
client.newCall(request).enqueue(new Callback() {
@Override
public void onFailure(Call call, IOException e) {
isLoadingData = false;
e.printStackTrace();
}
@Override
public void onResponse(Call call, Response response) throws IOException {
try {
JSONObject object = new JSONObject(response.body().string());
Barbershop receivedShop = new Barbershop(object);
barbershopRequesterResponse.receivedNewBarbershop(receivedShop);
isLoadingData = false;
} catch (JSONException e) {
isLoadingData = false;
e.printStackTrace();
}
}
});
}
}
理发店：
public class Barbershop{
private String name;
private String city;
public Barbershop(JSONObject barbershopJSON) {
try {
JSONArray businessArray = barbershopJSON.getJSONObject("searchResult").getJSONObject("searchListings").getJSONArray("searchListing");
for(int i = 0; i < businessArray.length(); i++) {
//Parse JSON and assign to variables
JSONObject business_object_1 = businessArray.getJSONObject(i);
String primaryc = business_object_1.getString("primaryCategory");
//Check to make sure the main category is "Barbers"
if((primaryc).equals("Barbers")) {
name = business_object_1.getString("businessName");
city = business_object_1.getString("city");
}
}
} catch (JSONException e) {
e.printStackTrace();
}
}
public String getCity() {
return city;
}
public String getName() {
return name;
}
}
RecyclerAdapter：
public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerAdapter.ShopHolder> {
private ArrayList<Barbershop> mbarbershops;
public RecyclerAdapter(ArrayList<Barbershop> barbershops) {
mbarbershops = barbershops;
}
@Override
public RecyclerAdapter.ShopHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View inflatedView = LayoutInflater.from(parent.getContext())
.inflate(R.layout.cardview_barber_search, parent, false);
return new ShopHolder(inflatedView);
}
@Override
public void onBindViewHolder(RecyclerAdapter.ShopHolder holder, int position) {
Barbershop itemBarbershop = mbarbershops.get(position);
holder.bindShop(itemBarbershop);
}
@Override
public int getItemCount() {
return 0;
}
public static class ShopHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
private TextView mName;
private TextView mCity;
public ShopHolder(View view) {
super(view);
mName = (TextView) view.findViewById(R.id.textViewName);
mCity = (TextView) view.findViewById(R.id.textViewCity);
view.setOnClickListener(this);
}
@Override
public void onClick(View v) {
}
public void bindShop(Barbershop barbershop) {
mName.setText(barbershop.getName());
mCity.setText(barbershop.getCity());
}
}
}
最佳答案
由于无法实现该接口，因此无法进行投射。在这里，您注释掉的@override语句应该为您提供一条线索。
更改为：
public class SearchActivity extends AppCompatActivity
implements SearchForBarbershop.BarbershopRequesterResponse {
....
并且不要忘记删除您实现的方法的注释：
@Override
public void receivedNewShop(final Barbershop newBarbershop) {
....