AsyncTask onPostExecute（）有时不会被调用
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我有一个AsynTask来请求数据和更新UI，但是当我调用任务时，有时候不会调用onPostExecute（）。
我添加了log，来检查执行流程，当没有调用onPostExecute时，最后一个日志是doInBacground（）返回之前的那个 - > - > 应用程序冻结有没有人经历过类似的事情？
public class dataLoadTask extends AsyncTask<Boolean, Void, Boolean> {
JSONObject token;
public dataLoadTask(JSONObject token) {
if (token != null) {
this.token = token;
}
}
@Override
protected Boolean doInBackground(Boolean... params) {
JSONArray response;
Boolean result = false;
try {
loadingData = true;
response = NetworkUtils.schoolNotifications(token);
notifications = parseResponse(response);
Collections.sort(notifications, new NotificationsComparator());
loadingData = false;
JSONArray chatsJSON = NetworkUtils.schoolChats(token);
chats = new ArrayList<>();
for (int i = 0; i < chatsJSON.length(); i++) {
JSONObject json_chat = (JSONObject) chatsJSON.get(i);
Chat chat = new Chat(json_chat);
chats.add(chat);
}
Collections.sort(chats, new ChatsComparator());
result = true;
} catch (Exception e) {
e.printStackTrace();
}
return result;
}
@Override
protected void onPostExecute(Boolean result) {
if (result) {
bottomNavigation.setOnNavigationItemSelectedListener
(new BottomNavigationView.OnNavigationItemSelectedListener() {
@Override
public boolean onNavigationItemSelected(MenuItem item) {
Fragment selectedFragment = null;
String fragmentTag = ""; getSupportFragmentManager().popBackStack(null, FragmentManager.POP_BACK_STACK_INCLUSIVE);
switch (item.getItemId()) {
case R.id.action_home:
selectedFragment = HomeFragment.newInstance();
myBundle.putParcelableArrayList("notifications", notifications);
myBundle.putParcelableArrayList("chats", chats);
myBundle.putParcelableArrayList("schedule", schedule);
fragmentTag = HOME_TAG;
break;
case R.id.action_subjects:
selectedFragment = SubjectsFragment.newInstance();
myBundle.putParcelableArrayList("notifications", notifications);
myBundle.putParcelableArrayList("subjects", subjects);
break;
case R.id.action_tasks:
selectedFragment = TasksFragment.newInstance();
myBundle.putParcelableArrayList("notifications", notifications);
break;
case R.id.action_chats:
selectedFragment = ChatsFragment.newInstance();
myBundle.putParcelableArrayList("users", users);
myBundle.putParcelableArrayList("chats", chats);
fragmentTag = CHAT_TAG;
break;
case R.id.action_new_notification:
selectedFragment = NewNotificationFragment.newInstance();
myBundle.putParcelableArrayList("classes", classes);
break;
} getSupportActionBar().setDisplayHomeAsUpEnabled(false);
selectedFragment.setArguments(myBundle);
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
transaction.replace(R.id.frame_layout, selectedFragment, fragmentTag);
transaction.commit();
return true;
}
});
myBundle.putParcelableArrayList("notifications", notifications);
myBundle.putParcelableArrayList("chats", chats);
myBundle.putParcelableArrayList("schedule", schedule);
myBundle.putBoolean("startup", false);
Log.i("TESTTTTTTTTTTT", "9");
HomeFragment activeFragment = (HomeFragment) getSupportFragmentManager().findFragmentByTag(HOME_TAG);
Boolean homeActive = activeFragment != null && activeFragment.isVisible() ? true : false;
if (!loadingNewData || (loadingNewData && homeActive)) {
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
HomeFragment homeFragment = HomeFragment.newInstance();
homeFragment.setArguments(myBundle);
transaction.replace(R.id.frame_layout, homeFragment, HOME_TAG);
transaction.commit();
progressBar.setVisibility(View.INVISIBLE);
bottomNavigation.setEnabled(true);
profilePhoto.setEnabled(true);
} else
loadingNewData = false;
ChatsFragment activeChatsFragment = (ChatsFragment) getSupportFragmentManager().findFragmentByTag(CHAT_TAG);
Boolean chatsActive = activeChatsFragment != null && activeChatsFragment.isVisible() ? true : false;
if (chatsActive) {
activeChatsFragment.updateAdapter(chats);
}
} else {
Intent intent = new Intent(MainActivity.this, LoginActivity.class);
startActivity(intent);
}
loadDataProcessRunning = false;
}
}
日志：
12-22 12:23:27.916 15252-15252/com.cathedralsw.schoolteacher I/TESTTTTTTTTTTT: 01
12-22 12:23:27.916 15252-15292/com.cathedralsw.schoolteacher I/TESTTTTTTTTTTT: 1
12-22 12:23:29.549 15252-15292/com.cathedralsw.schoolteacher I/TESTTTTTTTTTTT: 2
12-22 12:23:29.560 15252-15292/com.cathedralsw.schoolteacher I/TESTTTTTTTTTTT: 3
12-22 12:23:29.668 15252-15292/com.cathedralsw.schoolteacher I/TESTTTTTTTTTTT: 4
12-22 12:23:29.668 15252-15292/com.cathedralsw.schoolteacher I/TESTTTTTTTTTTT: 5
12-22 12:23:29.669 15252-15292/com.cathedralsw.schoolteacher I/TESTTTTTTTTTTT: 55
12-22 12:23:29.669 15252-15292/com.cathedralsw.schoolteacher I/TESTTTTTTTTTTT: true
12-22 12:23:29.681 15252-15252/com.cathedralsw.schoolteacher I/TESTTTTTTTTTTT: 6
12-22 12:23:29.682 15252-15252/com.cathedralsw.schoolteacher I/TESTTTTTTTTTTT: 7
12-22 12:23:29.682 15252-15252/com.cathedralsw.schoolteacher I/TESTTTTTTTTTTT: 8
12-22 12:23:29.682 15252-15252/com.cathedralsw.schoolteacher I/TESTTTTTTTTTTT: 9
12-22 12:23:29.682 15252-15252/com.cathedralsw.schoolteacher I/TESTTTTTTTTTTT: 10
12-22 12:23:29.683 15252-15252/com.cathedralsw.schoolteacher I/TESTTTTTTTTTTT: 11
12-22 12:23:29.684 15252-15252/com.cathedralsw.schoolteacher I/TESTTTTTTTTTTT: 12
12-22 12:23:29.684 15252-15252/com.cathedralsw.schoolteacher I/TESTTTTTTTTTTT: 13
12-22 12:23:29.748 15252-15252/com.cathedralsw.schoolteacher E/BitmapFactory: Unable to decode stream: java.io.FileNotFoundException: /data/user/0/com.cathedralsw.schoolteacher/files/5 (No such file or directory)
12-22 12:23:29.876 15252-15252/com.cathedralsw.schoolteacher E/BitmapFactory: Unable to decode stream: java.io.FileNotFoundException: /data/user/0/com.cathedralsw.schoolteacher/files/5 (No such file or directory)
12-22 12:23:29.881 15252-15252/com.cathedralsw.schoolteacher E/BitmapFactory: Unable to decode stream: java.io.FileNotFoundException: /data/user/0/com.cathedralsw.schoolteacher/files/5 (No such file or directory)
12-22 12:23:29.883 15252-15257/com.cathedralsw.schoolteacher I/art: Do partial code cache collection, code=23KB, data=30KB
12-22 12:23:29.884 15252-15257/com.cathedralsw.schoolteacher I/art: After code cache collection, code=23KB, data=30KB
12-22 12:23:29.884 15252-15257/com.cathedralsw.schoolteacher I/art: Increasing code cache capacity to 128KB
12-22 12:23:29.887 15252-15252/com.cathedralsw.schoolteacher E/BitmapFactory: Unable to decode stream: java.io.FileNotFoundException: /data/user/0/com.cathedralsw.schoolteacher/files/5 (No such file or directory)
12-22 12:23:29.910 15252-15252/com.cathedralsw.schoolteacher E/BitmapFactory: Unable to decode stream: java.io.FileNotFoundException: /data/user/0/com.cathedralsw.schoolteacher/files/5 (No such file or directory)
12-22 12:23:29.924 15252-15252/com.cathedralsw.schoolteacher E/BitmapFactory: Unable to decode stream: java.io.FileNotFoundException: /data/user/0/com.cathedralsw.schoolteacher/files/6 (No such file or directory)
12-22 12:23:34.445 15252-15252/com.cathedralsw.schoolteacher I/hwaps: JNI_OnLoad
12-22 12:23:35.168 15252-15257/com.cathedralsw.schoolteacher I/art: Do partial code cache collection, code=52KB, data=60KB
12-22 12:23:35.169 15252-15257/com.cathedralsw.schoolteacher I/art: After code cache collection, code=51KB, data=60KB
12-22 12:23:35.169 15252-15257/com.cathedralsw.schoolteacher I/art: Increasing code cache capacity to 256KB
12-22 12:23:35.530 15252-15252/com.cathedralsw.schoolteacher E/RecyclerView: No adapter attached; skipping layout
12-22 12:23:35.575 15252-15252/com.cathedralsw.schoolteacher I/Choreographer: Skipped 57 frames! The application may be doing too much work on its main thread.
12-22 12:23:35.886 15252-15279/com.cathedralsw.schoolteacher I/FA: Tag Manager is not found and thus will not be used
12-22 12:23:36.899 15252-15252/com.cathedralsw.schoolteacher I/TextInputLayout: EditText added is not a TextInputEditText. Please switch to using that class instead.
12-22 12:23:38.361 15252-15252/com.cathedralsw.schoolteacher I/HwPointEventFilter: do not support AFT because of no config
12-22 12:23:41.346 15252-15252/com.cathedralsw.schoolteacher I/HwSecImmHelper: mSecurityInputMethodService is null
12-22 12:23:41.361 15252-15252/com.cathedralsw.schoolteacher E/SpannableStringBuilder: SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
12-22 12:23:41.361 15252-15252/com.cathedralsw.schoolteacher E/SpannableStringBuilder: SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
12-22 12:23:41.372 15252-15252/com.cathedralsw.schoolteacher E/SpannableStringBuilder: SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
12-22 12:23:41.372 15252-15252/com.cathedralsw.schoolteacher E/SpannableStringBuilder: SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
12-22 12:23:42.755 15252-15252/com.cathedralsw.schoolteacher W/IInputConnectionWrapper: finishComposingText on inactive InputConnection
12-22 12:23:42.759 15252-15252/com.cathedralsw.schoolteacher E/SpannableStringBuilder: SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
12-22 12:23:42.759 15252-15252/com.cathedralsw.schoolteacher E/SpannableStringBuilder: SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
12-22 12:23:42.766 15252-15252/com.cathedralsw.schoolteacher E/SpannableStringBuilder: SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
12-22 12:23:42.766 15252-15252/com.cathedralsw.schoolteacher E/SpannableStringBuilder: SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
12-22 12:23:44.760 15252-15252/com.cathedralsw.schoolteacher I/HwSecImmHelper: mSecurityInputMethodService is null
12-22 12:23:44.841 15252-15252/com.cathedralsw.schoolteacher I/HwPointEventFilter: do not support AFT because of no config
12-22 12:23:46.033 15252-15252/com.cathedralsw.schoolteacher I/TESTTTTTTTTTTT: 01
12-22 12:23:46.034 15252-15292/com.cathedralsw.schoolteacher I/TESTTTTTTTTTTT: 1
12-22 12:23:46.059 15252-15252/com.cathedralsw.schoolteacher I/HwSecImmHelper: mSecurityInputMethodService is null
12-22 12:23:47.798 15252-15292/com.cathedralsw.schoolteacher I/TESTTTTTTTTTTT: 2
12-22 12:23:47.808 15252-15292/com.cathedralsw.schoolteacher I/TESTTTTTTTTTTT: 3
12-22 12:23:47.820 15252-15252/com.cathedralsw.schoolteacher I/Choreographer: Skipped 106 frames! The application may be doing too much work on its main thread.
12-22 12:23:47.902 15252-15292/com.cathedralsw.schoolteacher I/TESTTTTTTTTTTT: 4
12-22 12:23:47.903 15252-15292/com.cathedralsw.schoolteacher I/TESTTTTTTTTTTT: 5
12-22 12:23:47.903 15252-15292/com.cathedralsw.schoolteacher I/TESTTTTTTTTTTT: 55
12-22 12:23:47.903 15252-15292/com.cathedralsw.schoolteacher I/TESTTTTTTTTTTT: true
12-22 12:23:48.551 15252-15257/com.cathedralsw.schoolteacher I/art: Do full code cache collection, code=122KB, data=123KB
12-22 12:23:48.552 15252-15257/com.cathedralsw.schoolteacher I/art: After code cache collection, code=100KB, data=86KB
12-22 12:23:48.644 15252-15252/com.cathedralsw.schoolteacher I/HwPointEventFilter: do not support AFT because of no config
12-22 12:23:48.655 15252-15252/com.cathedralsw.schoolteacher W/IInputConnectionWrapper: getExtractedText on inactive InputConnection
12-22 12:23:48.656 15252-15252/com.cathedralsw.schoolteacher I/Choreographer: Skipped 49 frames! The application may be doing too much work on its main thread.
12-22 12:23:48.720 15252-15252/com.cathedralsw.schoolteacher I/TESTTTTTTTTTTT: 6
12-22 12:23:48.720 15252-15252/com.cathedralsw.schoolteacher I/TESTTTTTTTTTTT: 7
12-22 12:23:48.720 15252-15252/com.cathedralsw.schoolteacher I/TESTTTTTTTTTTT: 8
12-22 12:23:48.720 15252-15252/com.cathedralsw.schoolteacher I/TESTTTTTTTTTTT: 9
12-22 12:23:48.720 15252-15252/com.cathedralsw.schoolteacher I/TESTTTTTTTTTTT: 10
12-22 12:23:48.720 15252-15252/com.cathedralsw.schoolteacher I/TESTTTTTTTTTTT: 11
12-22 12:23:48.720 15252-15252/com.cathedralsw.schoolteacher I/TESTTTTTTTTTTT: 12
12-22 12:23:48.720 15252-15252/com.cathedralsw.schoolteacher I/TESTTTTTTTTTTT: 13
12-22 12:23:48.720 15252-15252/com.cathedralsw.schoolteacher W/IInputConnectionWrapper: getTextBeforeCursor on inactive InputConnection
12-22 12:23:48.747 15252-15252/com.cathedralsw.schoolteacher W/IInputConnectionWrapper: getSelectedText on inactive InputConnection
12-22 12:23:48.751 15252-15252/com.cathedralsw.schoolteacher W/IInputConnectionWrapper: getTextAfterCursor on inactive InputConnection
12-22 12:23:48.752 15252-15252/com.cathedralsw.schoolteacher W/IInputConnectionWrapper: getExtractedText on inactive InputConnection
12-22 12:23:48.752 15252-15252/com.cathedralsw.schoolteacher W/IInputConnectionWrapper: getTextBeforeCursor on inactive InputConnection
12-22 12:23:48.753 15252-15252/com.cathedralsw.schoolteacher W/IInputConnectionWrapper: getSelectedText on inactive InputConnection
12-22 12:23:48.753 15252-15252/com.cathedralsw.schoolteacher W/IInputConnectionWrapper: getTextAfterCursor on inactive InputConnection
12-22 12:23:48.755 15252-15252/com.cathedralsw.schoolteacher W/IInputConnectionWrapper: getExtractedText on inactive InputConnection
12-22 12:23:48.755 15252-15252/com.cathedralsw.schoolteacher W/IInputConnectionWrapper: getTextBeforeCursor on inactive InputConnection
12-22 12:23:48.755 15252-15252/com.cathedralsw.schoolteacher W/IInputConnectionWrapper: getSelectedText on inactive InputConnection
12-22 12:23:48.756 15252-15252/com.cathedralsw.schoolteacher W/IInputConnectionWrapper: getTextAfterCursor on inactive InputConnection
12-22 12:23:53.903 15252-15252/com.cathedralsw.schoolteacher I/TextInputLayout: EditText added is not a TextInputEditText. Please switch to using that class instead.
12-22 12:23:55.415 15252-15252/com.cathedralsw.schoolteacher I/HwPointEventFilter: do not support AFT because of no config
12-22 12:23:56.601 15252-15252/com.cathedralsw.schoolteacher W/IInputConnectionWrapper: finishComposingText on inactive InputConnection
12-22 12:23:57.745 15252-15252/com.cathedralsw.schoolteacher I/HwSecImmHelper: mSecurityInputMethodService is null
12-22 12:23:57.756 15252-15252/com.cathedralsw.schoolteacher E/SpannableStringBuilder: SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
12-22 12:23:57.756 15252-15252/com.cathedralsw.schoolteacher E/SpannableStringBuilder: SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
12-22 12:23:57.762 15252-15252/com.cathedralsw.schoolteacher E/SpannableStringBuilder: SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
12-22 12:23:57.762 15252-15252/com.cathedralsw.schoolteacher E/SpannableStringBuilder: SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
12-22 12:23:59.740 15252-15252/com.cathedralsw.schoolteacher W/IInputConnectionWrapper: finishComposingText on inactive InputConnection
12-22 12:23:59.744 15252-15252/com.cathedralsw.schoolteacher E/SpannableStringBuilder: SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
12-22 12:23:59.744 15252-15252/com.cathedralsw.schoolteacher E/SpannableStringBuilder: SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
12-22 12:23:59.749 15252-15252/com.cathedralsw.schoolteacher E/SpannableStringBuilder: SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
12-22 12:23:59.750 15252-15252/com.cathedralsw.schoolteacher E/SpannableStringBuilder: SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
12-22 12:24:00.910 15252-15252/com.cathedralsw.schoolteacher I/HwSecImmHelper: mSecurityInputMethodService is null
12-22 12:24:00.985 15252-15252/com.cathedralsw.schoolteacher I/HwPointEventFilter: do not support AFT because of no config
12-22 12:24:02.687 15252-15252/com.cathedralsw.schoolteacher I/TESTTTTTTTTTTT: 01
12-22 12:24:02.687 15252-15298/com.cathedralsw.schoolteacher I/TESTTTTTTTTTTT: 1
12-22 12:24:02.707 15252-15252/com.cathedralsw.schoolteacher I/HwSecImmHelper: mSecurityInputMethodService is null
12-22 12:24:04.603 15252-15298/com.cathedralsw.schoolteacher I/TESTTTTTTTTTTT: 2
12-22 12:24:04.611 15252-15298/com.cathedralsw.schoolteacher I/TESTTTTTTTTTTT: 3
12-22 12:24:04.703 15252-15298/com.cathedralsw.schoolteacher I/TESTTTTTTTTTTT: 4
12-22 12:24:04.704 15252-15298/com.cathedralsw.schoolteacher I/TESTTTTTTTTTTT: 5
12-22 12:24:04.704 15252-15298/com.cathedralsw.schoolteacher I/TESTTTTTTTTTTT: 55
12-22 12:24:04.704 15252-15298/com.cathedralsw.schoolteacher I/TESTTTTTTTTTTT: true
应用程序冻结，最后一个日志来自doInBackground（）...上次调用中没有来自onPostExecute（）的日志
答案
如果你的android api版本超过14，用Asynctask执行你的executor。
因为在较低版本的Android中，所有AsyncTasks都是在单个后台线程上执行的。所以新任务可能正在等待，直到其他任务正常工作。
在Android的较低版本中（实际上在pre-HONEYCOMB上），您无法在执行程序上执行AsyncTask。
if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.HONEYCOMB)
task.executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR);
else
task.execute();
在HONEYCOMB execute（）方法之前并行运行AsynkTask。
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