為什么我的數(shù)組列表的值為空？當它在改造之外打印時，即使我已經(jīng)聲明了公共變量List<Profile> profileList = new ArrayList<Profile>();我想要在改造之外打印值數(shù)組列表但沒有工作。當在改造內(nèi)打印值數(shù)組列表時，它起作用了。這是我的代碼你好.javaList<Profile> profileList = new ArrayList<Profile>();apiService.getGetlistuser("getlistuser").enqueue(new Callback<ResponseDaftar>() { @Override public void onResponse(Call<ResponseDaftar> call, Response<ResponseDaftar> response) { if (response.isSuccessful()) { List<GetlistuserItem> getlistuserItemList = response.body().getGetlistuser(); for (int i = 0; i < getlistuserItemList.size(); i++) { profileList.add(new Profile( getlistuserItemList.get(i).getUserID(), getlistuserItemList.get(i).getNickname() )); } /* is working for (Profile p : profileList){ Log.i("info", p.getUserid() + '\n' + p.getNickname()); } */ } } }); // my value is empty for (Profile p : profileList){ Log.i("info", p.getUserid() + '\n' + p.getNickname()); }改造接口@POST("GetListNews.php") @FormUrlEncoded Call<ResponseDaftar> getGetlistuser(@Field("TableName") String paramTable);
3 回答
明月笑刀無情
TA貢獻1828條經(jīng)驗 獲得超4個贊
從服務器獲取數(shù)據(jù)可能會有一些延遲。
因此，您可以添加一個listener將在您的代碼打印列表被填充后觸發(fā)（如果您的打印代碼將在另一個類中），或者如果它在同一個類中，則調(diào)用另一個方法。
示例代碼
List<Profile> profileList = new ArrayList<Profile>();
public void getData(){
final Listener listener = new Listener() {
@Override
public void onDataReceived() {
//print command goes here
}
}
apiService.getGetlistuser("getlistuser").enqueue(new Callback<ResponseDaftar>() {
@Override
public void onResponse(Call<ResponseDaftar> call, Response<ResponseDaftar> response) {
if (response.isSuccessful()) {
List<GetlistuserItem> getlistuserItemList = response.body().getGetlistuser();
for (int i = 0; i < getlistuserItemList.size(); i++) {
profileList.add(new Profile(
getlistuserItemList.get(i).getUserID(),
getlistuserItemList.get(i).getNickname()
));
}
printData(); //if it is in same class
if(listener != null)
listener.onDataReceived(); //if it is going to happen in another class
/*
is working
for (Profile p : profileList){
Log.i("info", p.getUserid() + '\n' + p.getNickname());
}
*/
}
}
});
// my value is empty
for (Profile p : profileList){
Log.i("info", p.getUserid() + '\n' + p.getNickname());
}
}
public void printData(){
for (Profile p : profileList){
Log.i("info", p.getUserid() + '\n' + p.getNickname());
}
}
// this will be going to make in separate file
interface Listener{
void onDataReceived();
}
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