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SQLite를 통해 캐시 데이터가 채워지는 listview가 있습니다. 로드가 완료된 후 백그라운드에서 새 데이터를 확인한 후 db에서 JSON 결과를 반환합니다. 이 코드 (코드 아래)를 실행하고,이 (50 개 루프 최대)를 통해 반복되는 동안 상기 UI 스레드가 차단되고,이 배경 task, 내 onPostExecute에서AsyncTask의 무언가 UI 차단 - 인터페이스가 잠시 중단되게 함
는 ListView 스크롤링 불가능 . 다음은 코드입니다.
if (result.length() != 0) {
JSONArray jArray = new JSONArray(result);
JSONObject json_data = null;
for (int ii = 0; ii < jArray.length(); ii++) {
json_data = jArray.getJSONObject(ii);
item = json_data.getString("item");
cat = json_data.getString("category");
user = json_data.getString("username");
userId = json_data.getLong("user_id");
review = json_data.getString("review");
reviewId = json_data.getLong("review_id");
itemId = json_data.getLong("item_id");
commentCount = json_data.getLong("commentCount");
url = json_data.getString("name");
url = pathUrl + url; // for profile icon
date = json_data.getString("date");
rating = json_data.getDouble("rating");
upVote = json_data.getLong("good");
wiki = json_data.getString("wiki");
watchItems.add(item);
watchCats.add(cat);
watchUsers.add(user);
watchReviews.add(review);
watchUrl.add(url);
watchDateList.add(date);
watchWikiList.add(wiki);
watchItemIdList.add(String.valueOf(itemId));
watchUserIds.add(String.valueOf(userId));
watchReviewId.add(String.valueOf(reviewId));
watchRating.add(String.valueOf(rating));
watchCommentCount.add(String.valueOf(commentCount));
watchUpVote.add(String.valueOf(upVote));
Rateit.haveFollowing = "1";
if (Rateit.isUserLoggedIn == true) {
boolean oldReview = datasource
.getReviewIds(reviewId);
if (!oldReview) {
// Cache Network Items
datasource.createTrendWatch(itemId, item,
review, reviewId, cat, user,
String.valueOf(userId), url, date,
commentCount, rating, upVote, 0,
wiki);
}
}
FollowingItems wti = new FollowingItems(
Long.valueOf(watchItemIdList.get(i)),
watchItems.get(i), watchCats.get(i),
watchReviews.get(i),
Long.valueOf(watchReviewId.get(i)),
watchUsers.get(i),
Long.valueOf(watchUserIds.get(i)),
watchUrl.get(i), watchDateList.get(i),
Long.valueOf(watchCommentCount.get(i)),
Double.valueOf(watchRating.get(i)),
Long.valueOf(watchUpVote.get(i)),
watchWikiList.get(i++));
watchingListObject.add(wti);
}
}
왜 이런 일이 발생합니까? 어떻게하면 내 코드가이를 막을 수 있습니까? 내가 할 수있는 최적화가 있습니까?
편집 : 아래의 누군가가 전체 task 코드를 요청했습니다.
Below repeats the code above but in context with entire task.
public static class FollowingTask extends AsyncTask<String, String, Void> {
protected InputStream is = null;
protected String result = "";
protected String userId;
protected ArrayList<FollowingItems> watchingListObject;
protected Context mContext;
public FollowingTask(Context context) {
mContext = context;
}
@Override
protected void onPreExecute() {
if (mContext != null && (fromRefresh == false)) {
((MainFragmentActivity) mContext)
.setSupportProgressBarIndeterminateVisibility(true);
}
resetLists();
if (PrefActivity.getUserLoggedInStatus(mContext) == true) {
userId = PrefActivity.getLoggedInUserId(mContext);
} else {
userId = "-1";
}
super.onPreExecute();
}
@Override
protected Void doInBackground(String... params) {
datasource.purgeItemWatchingTable();
Log.d("1", "Back");
String url_select = "http://www.---.info/includes_mc_php/featured_watching.php";
HttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url_select);
ArrayList<NameValuePair> param = new ArrayList<NameValuePair>();
param.add(new BasicNameValuePair("user_id", userId));
param.add(new BasicNameValuePair("v2", "true"));
try {
httpPost.setEntity(new UrlEncodedFormEntity(param));
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
// read content
is = httpEntity.getContent();
} catch (Exception e) {
e.printStackTrace();
}
try {
BufferedReader br = new BufferedReader(
new InputStreamReader(is));
StringBuilder sb = new StringBuilder();
String line = "";
while ((line = br.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
result = sb.toString();
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
protected void onPostExecute(Void v) {
String pathUrl = Rateit.PROFILE_PIC_URL;
String item, cat, user, review, url, date, following, wiki;
long itemId, reviewId, userId, commentCount, upVote;
double rating;
int i = 0;
watchingListObject = new ArrayList<FollowingItems>();
try {
String c = String.valueOf(result.charAt(0));
if (c.equals("{")) {
JSONObject jsonObject = new JSONObject(result);
following = jsonObject.getString("following");
if (following.equals("0")) {
Rateit.haveFollowing = "0";
}
} else {
if (result.length() != 0) {
JSONArray jArray = new JSONArray(result);
JSONObject json_data = null;
for (int ii = 0; ii < jArray.length(); ii++) {
json_data = jArray.getJSONObject(ii);
item = json_data.getString("item");
cat = json_data.getString("category");
user = json_data.getString("username");
userId = json_data.getLong("user_id");
review = json_data.getString("review");
reviewId = json_data.getLong("review_id");
itemId = json_data.getLong("item_id");
commentCount = json_data.getLong("commentCount");
url = json_data.getString("name");
url = pathUrl + url; // for profile icon
date = json_data.getString("date");
rating = json_data.getDouble("rating");
upVote = json_data.getLong("good");
wiki = json_data.getString("wiki");
watchItems.add(item);
watchCats.add(cat);
watchUsers.add(user);
watchReviews.add(review);
watchUrl.add(url);
watchDateList.add(date);
watchWikiList.add(wiki);
watchItemIdList.add(String.valueOf(itemId));
watchUserIds.add(String.valueOf(userId));
watchReviewId.add(String.valueOf(reviewId));
watchRating.add(String.valueOf(rating));
watchCommentCount.add(String.valueOf(commentCount));
watchUpVote.add(String.valueOf(upVote));
Rateit.haveFollowing = "1";
if (Rateit.isUserLoggedIn == true) {
boolean oldReview = datasource
.getReviewIds(reviewId);
if (!oldReview) {
// Cache Network Items
datasource.createTrendWatch(itemId, item,
review, reviewId, cat, user,
String.valueOf(userId), url, date,
commentCount, rating, upVote, 0,
wiki);
}
}
FollowingItems wti = new FollowingItems(
Long.valueOf(watchItemIdList.get(i)),
watchItems.get(i), watchCats.get(i),
watchReviews.get(i),
Long.valueOf(watchReviewId.get(i)),
watchUsers.get(i),
Long.valueOf(watchUserIds.get(i)),
watchUrl.get(i), watchDateList.get(i),
Long.valueOf(watchCommentCount.get(i)),
Double.valueOf(watchRating.get(i)),
Long.valueOf(watchUpVote.get(i)),
watchWikiList.get(i++));
watchingListObject.add(wti);
Log.d("1", "Post 2");
}
} else {
Rateit.haveFollowing = "2";
}
}
} catch (JSONException e1) {
e1.printStackTrace();
Rateit.haveFollowing = "2";
} catch (ParseException e1) {
e1.printStackTrace();
} catch (Exception e) {
e.printStackTrace();
}
Log.d("1", "Post COMPLETE");
mPullRefreshListView.onRefreshComplete();
// Reset Trending List on Pull-to-Refresh
if (mContext != null) {
if (watchUsers.size() == 0) {
l.setVisibility(View.VISIBLE);
tv.setTypeface(TypeFace.get(mContext, Rateit.BPREPLAY));
} else {
l.setVisibility(View.GONE);
}
if (mContext != null) {
listView.setAdapter(null);
if (watchItems.size() > 0) {
wAdapter = new FollowingAdapter(mContext,
watchingListObject, TypeFace.get(mContext,
Rateit.BPREPLAY), TypeFace.get(
mContext, Rateit.ROBOTO_LIGHT),
TypeFace.get(mContext, Rateit.ROBOTO_THIN),
TypeFace.get(mContext, Rateit.ROBOTO_REGULAR));
listView.setAdapter(wAdapter);
}
}
}
if (mContext != null && (fromRefresh == false)) {
((MainFragmentActivity) mContext)
.setSupportProgressBarIndeterminateVisibility(false);
MainFragmentActivity.dismissDialog(mContext);
}
fromRefresh = false;
}
}
'onPostExecute'는 UI 스레드에서 실행됩니다. 그것은 UI를 차단합니다. 'doInBackground'는 백그라운드에서 실행됩니다. 'onPostExecute'가 아닌'doInBackground'에서 무거운 오퍼레이션을 수행해야합니다 .. –
@AmulyaKhare 예,하지만 doInBackground에서 JSON 항목을 구문 분석 할 수 있다고 생각하지 않습니다. – KickingLettuce
힌트 : SQLite에서 데이터를로드하려면 데이터베이스 당신은'Louders' asyncTask가 아닌 것으로 생각해야합니다. – Coderji