我是 retrofit 2 的新手，我正在嘗試獲取 json 數組數據，但結果為空，這是獲取數據的 url。但有趣的是，當我嘗試在內部進行調試時，onResponse我得到了成功消息和response.body數據。這里有什么問題？https://xenzet.com/GameCheat/viewgamesjson.php這是json數據[ { "gameid":"2", "gameIcon":"https:\/\/xenzet.com\/GameCheat\/uploads\/counter strike 1.6.png", "Games_Name":"1" }, { "gameid":"3", "gameIcon":"https:\/\/xenzet.com\/GameCheat\/uploads\/gta.ico", "Games_Name":"vice city sucjlfsdrgefdsrhag" }, { "gameid":"4", "gameIcon":"https:\/\/xenzet.com\/GameCheat\/uploads\/pubg.png", "Games_Name":"pubg" }, { "gameid":"5", "gameIcon":"https:\/\/xenzet.com\/GameCheat\/uploads\/doom.png", "Games_Name":"Doom Enternal" }, { "gameid":"6", "gameIcon":"https:\/\/xenzet.com\/GameCheat\/uploads\/for.png", "Games_Name":"Fornite" }, { "gameid":"9", "gameIcon":"https:\/\/xenzet.com\/GameCheat\/uploads\/dota2.png", "Games_Name":"dota2" }]這是試圖獲取數據的方法 public void fetch_information() { ApiInterface = ApiClient.getApiClient().create(Api.class); Call<List<Games>> call = ApiInterface.GetGames(); call.enqueue(new Callback<List<Games>>() { @Override public void onResponse(Call<List<Games>> call, Response<List<Games>> response) { if(response.isSuccessful()) { gameslist = response.body(); gamescounter = gameslist.size(); adapter = new GameRecyclerViewAdapter(GamesActivity.this, gameslist); recyclerView.setAdapter(adapter); } } @Override public void onFailure(Call<List<Games>> call, Throwable t) { Toast.makeText(getApplicationContext(), t.getMessage(), Toast.LENGTH_SHORT).show(); } }); }
3 回答
紅糖糍粑
TA貢獻1815條經驗 獲得超6個贊
在 onResponse 方法中的適配器中添加數據
fetch_information()在oncreate中添加
@Override
public void onResponse(Call<List<Games>> call, Response<List<Games>> response) {
if(response.isSuccessful()) {
gameslist = response.body();
adapter = new GameRecyclerViewAdapter(MainActivity.this, gameslist);
//change your Activity name here insted of MainActivity
recyclerView.setAdapter(adapter);
}
}
嚕嚕噠
TA貢獻1784條經驗 獲得超7個贊
我沒有檢查你在哪里弄錯了。但是此代碼實現返回列表中包含 10 個數據的列表。
public interface APIInterface {
@GET()
Call<List<ViewGame>> viewgamesjson(@Url String url);
}
這是模型類：
public class ViewGame {
String gameid,gameIcon,Games_Name;
public String getGameid() {
return gameid;
}
public void setGameid(String gameid) {
this.gameid = gameid;
}
public String getGameIcon() {
return gameIcon;
}
public void setGameIcon(String gameIcon) {
this.gameIcon = gameIcon;
}
public String getGames_Name() {
return Games_Name;
}
public void setGames_Name(String games_Name) {
Games_Name = games_Name;
}
}
這是 APiClient 類：
public class APIClient {
static Retrofit retrofit = null;
public static String Base_URL = "https://xenzet.com/GameCheat/";
public static APIInterface getInterface() {
HttpLoggingInterceptor interceptor = new HttpLoggingInterceptor();
interceptor.setLevel(HttpLoggingInterceptor.Level.BODY);
OkHttpClient client = new OkHttpClient.Builder()
.readTimeout(60, TimeUnit.SECONDS)
.connectTimeout(60, TimeUnit.SECONDS)
.addInterceptor(interceptor)
.build();
retrofit = new Retrofit.Builder()
.baseUrl(Base_URL)
.addConverterFactory(GsonConverterFactory.create())
.client(client)
.build();
return retrofit.create(APIInterface.class);
}
}
這是 API 調用：
private void viewGame() {
Call<List<ViewGame>> call = APIClient.getInterface().viewgamesjson("https://xenzet.com/GameCheat/viewgamesjson.php");
call.enqueue(new Callback<List<ViewGame>>() {
@Override
public void onResponse(Call<List<ViewGame>> call, Response<List<ViewGame>> response) {
try {
Global.dismissProgress();
if (response.isSuccessful() && response.body() != null) {
Global.dismissProgress();
Global.printLog("size===", response.body().size() + "");
} else {
Global.dismissProgress();
}
} catch (Exception e) {
e.printStackTrace();
Global.dismissProgress();
}
}
@Override
public void onFailure(Call<List<ViewGame>> call, Throwable t) {
Global.dismissProgress();
try {
Global.showToast(SplashActivity.this, getString(R.string.something_wrong));
} catch (Exception e) {
e.printStackTrace();
}
call.cancel();
t.printStackTrace();
}
});
}
滄海一幻覺
TA貢獻1824條經驗 獲得超5個贊
問題是，您在 onCreate() 中設置了列表適配器，其中gameslist仍然為空。
adapter = new GameRecyclerViewAdapter(this, gameslist); recyclerView.setAdapter(adapter);
當你調用 setAdapter() 方法時，recyclerView 會向適配器詢問項目的數量；我想在 getItemCount() 中，你有類似 return gameslist.count() 的東西。由于游戲列表仍然為空，這會導致 NPE。
要修復它，請將 getItemCount() 更改為如下所示：
return gameslist == null ? 0 : gameslist.size()
編輯
我檢查了您的 URL（使用 Postman），似乎響應的內容類型text/html不application/json正確。我想因此沒有使用 Gson 轉換響應，因此您最終得到 null。
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