问题描述
我正在尝试制作一个可以获取实时游戏成绩的应用程序，但是在使用recycleviewer和arraylist时遇到了麻烦。
RecycleView可以正常工作，但是当我制作要填充RecycleView的arraylist时出现了麻烦。 在这里，我只用100个游戏对象填充数组，这可行。 我得到的屏幕上充满了100个随机游戏。
private void updateUI() {
ArrayList<Games> games = new ArrayList<>();
for (int i = 0; i < 100; i++) {
Games g = new Games("t1",110);
g.setTeam2("T2");
g.setTeam2_score(120);
games.add(g);
}
mAdapter = new GameAdapter(games);
mGameRecycleViewer.setAdapter(mAdapter);
}
我不想要任何随机的100个对象，我想获取一天发生的游戏并用它们填充数组。 因此，我使用JSON来获取游戏，并且由于该日志消息，我知道数组中充满了游戏：Log.d（“ AAAAAHHHHHHH”，Integer.toString（games.size（）））; 告诉我得到此输出的数组大小：
D/AAAAAHHHHHHH: 1
D/AAAAAHHHHHHH: 2
D/AAAAAHHHHHHH: 2
D/AAAAAHHHHHHH: 3
D/AAAAAHHHHHHH: 3
D/AAAAAHHHHHHH: 4
D/AAAAAHHHHHHH: 4
D/AAAAAHHHHHHH: 5
D/AAAAAHHHHHHH: 5
D/AAAAAHHHHHHH: 6
D/AAAAAHHHHHHH: 6
D/AAAAAHHHHHHH: 7
D/AAAAAHHHHHHH: 7
D/AAAAAHHHHHHH: 8
D/AAAAAHHHHHHH: 8
D/AAAAAHHHHHHH: 9
D/AAAAAHHHHHHH: 9
D/AAAAAHHHHHHH: 10
D/AAAAAHHHHHHH: 10
D/AAAAAHHHHHHH: 11
D/AAAAAHHHHHHH: 11
另外，我尝试使用JSON而不使用回收站查看器，而是在屏幕上输出所有内容，因此也可以使用。 问题是，尽管上面显示了原因，但由于某种原因，没有任何东西留在游戏数组中。 它不会显示在屏幕上。
我还在执行后立即添加了另一个logd，它说大小为0：Log.d（“ OOOHHHHHHH”，Integer.toString（games.size（）））;
因此由于某种原因，数组无法在运行类之外填充。 任何人有任何建议，或知道如何修复？
这是使用JSON的updateUI：
ArrayList<Games> games = new ArrayList<>();
private void updateUI() {
class run extends AsyncTask<Void,Void,Void> {
String line = "";
String data = "";
@Override
protected Void doInBackground(Void... voids) {
try {
URL url = new URL("https://stats.nba.com/stats/scoreboard/?GameDate=02/13/2019&LeagueID=00&DayOffset=0");
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
InputStream is = conn.getInputStream();
BufferedReader bf = new BufferedReader(new InputStreamReader(is));
while(line!=null){
line = bf.readLine();
data += line;
}
JSONObject jo = new JSONObject(data);
JSONArray ja = (JSONArray) jo.get("resultSets");
JSONObject jo2 = (JSONObject) ja.get(1);//Linescores
JSONArray ja3 = (JSONArray) jo2.get("rowSet");
JSONArray ja4;
int count = 0;
for(int i = 0;i<ja3.length();i++){
ja4 = new JSONArray(ja3.get(i).toString());
//teams+=ja4.get(4)+": score = "+ja4.get(21).toString()+"\n";
if(count == 1) {
games.get(games.size() - 1).setTeam2(ja4.get(4).toString());
games.get(games.size() - 1).setTeam2_score(Integer.parseInt(ja4.get(21).toString()));
count = 0;
}else{
games.add(new Games(ja4.get(4).toString(), Integer.parseInt(ja4.get(21).toString())));
count = 1;
}
Log.d("AAAAAHHHHHHH",Integer.toString(games.size()));
}
}catch (Exception e){
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Void aVoid) {
super.onPostExecute(aVoid);
//main.setText(teams);
}
}
run r = new run();
r.execute();
mAdapter = new GameAdapter(games);
mGameRecycleViewer.setAdapter(mAdapter);
}
这是完整的RecycleViewer：
public class GameListFragment extends Fragment {
private RecyclerView mGameRecycleViewer;
private GameAdapter mAdapter;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_game_list, container, false);
mGameRecycleViewer = (RecyclerView) view
.findViewById(R.id.game_recycler_view);
mGameRecycleViewer.setLayoutManager(new LinearLayoutManager(getActivity()));
updateUI();
return view;
}
private class GameHolder extends RecyclerView.ViewHolder {
public GameHolder(LayoutInflater inflater, ViewGroup parent) {
super(inflater.inflate(R.layout.list_game_item, parent, false));
}
}
private class GameAdapter extends RecyclerView.Adapter<GameHolder> {
private List<Games> mGames;
public GameAdapter(List<Games> crimes) {
mGames = crimes;
}
@Override
public GameHolder onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater layoutInflater = LayoutInflater.from(getActivity());
return new GameHolder(layoutInflater, parent);
}
@Override
public void onBindViewHolder(GameHolder holder, int position) {
}
@Override
public int getItemCount() {
return mGames.size();
}
}
ArrayList<Games> games = new ArrayList<>();
private void updateUI() {
//GameLab gamelab = GameLab.get(getActivity());
//ArrayList<Games> crimes = gamelab.getGames();
//for (int i = 0; i < 100; i++) {
//Games g = new Games("t1",110);
//g.setTeam2("T2");
//g.setTeam2_score(120);
//games.add(g);
//}
class run extends AsyncTask<Void,Void,Void> {
String line = "";
String data = "";
@Override
protected Void doInBackground(Void... voids) {
try {
URL url = new URL("https://stats.nba.com/stats/scoreboard/?GameDate=02/13/2019&LeagueID=00&DayOffset=0");
HttpURLConnection conn = (HttpURLConnection) url.openConnection();
InputStream is = conn.getInputStream();
BufferedReader bf = new BufferedReader(new InputStreamReader(is));
while(line!=null){
line = bf.readLine();
data += line;
}
JSONObject jo = new JSONObject(data);
JSONArray ja = (JSONArray) jo.get("resultSets");
JSONObject jo2 = (JSONObject) ja.get(1);//Linescores
JSONArray ja3 = (JSONArray) jo2.get("rowSet");
JSONArray ja4;
int count = 0;
for(int i = 0;i<ja3.length();i++){
ja4 = new JSONArray(ja3.get(i).toString());
//teams+=ja4.get(4)+": score = "+ja4.get(21).toString()+"\n";
if(count == 1) {
games.get(games.size() - 1).setTeam2(ja4.get(4).toString());
games.get(games.size() - 1).setTeam2_score(Integer.parseInt(ja4.get(21).toString()));
count = 0;
}else{
games.add(new Games(ja4.get(4).toString(), Integer.parseInt(ja4.get(21).toString())));
count = 1;
}
Log.d("AAAAAHHHHHHH",Integer.toString(games.size()));
}
}catch (Exception e){
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Void aVoid) {
super.onPostExecute(aVoid);
//main.setText(teams);
}
}
run r = new run();
r.execute();
mAdapter = new GameAdapter(games);
mGameRecycleViewer.setAdapter(mAdapter);
}
}
1楼
在获取json数据之前已经设置了适配器，因此可能正在发送一个空列表。 列表中已完全填充数据后，应在onPostExecute中设置适配器：
@Override
protected void onPostExecute(Void aVoid) {
super.onPostExecute(aVoid);
//main.setText(teams);
mAdapter = new GameAdapter(games);
mGameRecycleViewer.setAdapter(mAdapter);
}